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| ? 2007-2012 microchip technology inc. ds22042b-page 1 mcp1603/b/l features over 90% typical efficiency output current up to 500 ma low pfm quiescent current = 45 a, typical (mcp1603/l) low shutdown current = 0.1 a, typical adjustable output voltage: - 0.8v to 4.5v fixed output voltage: - 1.2v, 1.5v, 1.8v, 2.5v, 3.3v (mcp1603/l) - 1.8v, 3.3v (mcp1603b) 2.0 mhz fixed-frequency pwm (heavy load) automatic pwm-to-pfm mode transition (mcp1603/l) pwm mode only option (mcp1603b) 100% duty cycle operation internally compensated undervoltage lockout (uvlo) overtemperature protection space saving packages: - 5-lead tsot, two pinout types (mcp1603/l) - 8-lead 2 x 3 dfn applications cellular telephones portable computers organizers / pdas usb powered devices digital cameras portable equipment +5v or +3.3v distributed systems headsets general description the mcp1603/b/l is a high-efficiency, fully-integrated 500 ma synchronous buck regulator whose 2.7v to 5.5v input voltage range makes it ideally suited for applications powered from 1-cell li-ion or 2-cell/3-cell nimh/nicd batteries. at heavy loads, the mcp1603/b/l operates in the 2.0 mhz fixed frequency pulse-width modulation (pwm) mode, which provides a low noise, low-output ripple, small-size solution. when the load is reduced to light levels, the mcp1603/l automatically changes operation to a pulse frequency modulation (pfm) mode to minimize quiescent current draw from the battery. no intervention is necessary for a smooth transition from one mode to another. these two modes of operation allow the mcp1603/l to achieve the highest efficiency over the entire operating current range. the mcp1603b device disables the pfm mode switching, and operates only in normal pwm mode over the entire load range (without skipping). mcp1603b is for applications that cannot tolerate the low-frequency output ripple associated with pfm switching. the mcp1603/b/l family is available with either an adjustable or fixed-output voltage. the available fixed output voltage options for mcp1603/l are 1.2v, 1.5v, 1.8v, 2.5v and 3.3v, and for mcp1603b are 1.8 and 3.3v. when a fixed option is used, only three additional small external components are needed to form a complete solution. couple this with the low profile, small-foot print packages and the entire system solution is achieved with minimal size. additional protection features include: uvlo, overtemperature and overcurrent protection. 2.0 mhz, 500 ma synchronous buck regulator downloaded from: http:///
mcp1603/b/l ds22042b-page 2 ? 2007-2012 microchip technology inc. package types typical application circuit 1 234 5 l x v fb /v out shdn gnd v in 1 234 5 l x v fb /v out shdn gnd v in mcp1603/mcp1603b tsot mcp1603l tsot mcp1603 2x3 dfn* shdn nc v fb /v out v in nc 1 2 3 4 8 7 6 5 nc gnd l x * includes exposed thermal pad (ep); see table 3-1 . ep 9 v in shdn gnd v fb l x v in 2.7v to 4.5v v out 1.8v @ 500 ma c out 4.7 f c in 4.7 f l 1 4.7 h 30 40 50 60 70 80 90 100 efficiency (%) v out = 1.8v v in = 2.7v v in = 3.6v v in = 4.5v 10 20 30 0.1 1 10 100 1000 output current (ma) __ pfm/pwm (mcp1603/l) --- pwm (mcp1603b) downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 3 mcp1603/b/l functional block diagram ilim pwm ilim pfm ipeak pwm ipeak pfm v in shdn v fb /v out gnd l x band gap uvlo switch drive uvlo v ref logic and timing srq q soft start v ref pwm/pfm logic v ref slope comp. osc -i pk limit uvlo thermal shutdown tsd ea poff noff pwm/pfm - pwm only tsd pfm error amp pwm error amp ov threshold uv threshold i pk limit -ilpk ipeak pwm ipeak pfm disable switcher -ilpk pwm-only + + downloaded from: http:/// mcp1603/b/l ds22042b-page 4 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 5 mcp1603/b/l 1.0 electrical characteristics absolute maximum ratings ? v in - gnd.......................................................................+6.0v all other i/o ............................... (gnd - 0.3v) to (v in + 0.3v) l x to gnd .............................................. -0.3v to (v in + 0.3v) output short circuit current ................................. continuou s power dissipation ( note 5 ) .......................... internally limited storage temperature ....................................-65c to +150c ambient temp. with power applied ................-40c to +85c operating junction temperature...................-40c to +125c esd protection on all pins: hbm ............................................................................. 4 kv mm ................................................. .............................300v ? notice: stresses above those listed under "maximum ratings" may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specifica- tion is not intended. exposure to maximum rating con- ditions for extended periods may affect device reliability. dc characteristics electrical characteristics: unless otherwise indicated, mcp1603/l, v in = shdn = 3.6v, c out = c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i out =100ma, t a = +25c. boldface specifications apply over the t a range of -40c to +85c. parameters sym min typ max units conditions input characteristics input voltage v in 2.7 5.5 v note 1 maximum output current i out 500 m a note 1 shutdown current i in_shdn 0.1 1 a shdn = gnd quiescent current - pfm i q 4 5 60 a shdn = v in , i out = 0 ma, device switching quiescent current - pwm i q 1.0 2.7 4 ma shdn = v in , i out = 0 ma, device switching ( mcp1603b ) shutdown/uvlo/thermal shutdown characteristics shdn , logic input voltage low v il 15 %v in v in = 2.7v to 5.5v shdn , logic input voltage high v ih 45 % v in v in = 2.7v to 5.5v shdn , input leakage current i l_shdn -1.0 0.1 1.0 a v in = 2.7v to 5.5v undervoltage lockout uvlo 2.12 2.28 2.43 vv in falling undervoltage lockout hysteresis uvlo hys 1 4 0m v thermal shutdown t shd 1 5 0 c note 4 , note 5 thermal shutdown hysteresis t shd-hys 1 0 c note 4 , note 5 note 1: the input voltage should be greater then the output voltage plus headroom voltage; higher load currents increase the input voltage required for regulation. mcp1603b device requires a minimum load for regulation. see section 2.0, typical performance curves for typical operating voltage ranges. 2: reference feedback voltage tolerance applies to adjustable output voltage setting. 3: v r is the output voltage setting. 4: the maximum allowable power dissipation is a function of ambient temperature, the maximum allowable temperature and the thermal resistance from junction to air (i.e. t a , t j , ? ja ). exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. 5: the internal mosfet switches have an integral diode from the l x pin to the v in pin, and from the l x pin to the gnd pin. in cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. thermal protection is not able to limit the junction temperature for these cases. 6: the current limit threshold is a cycle-by-cycle peak current limit. downloaded from: http:/// mcp1603/b/l ds22042b-page 6 ? 2007-2012 microchip technology inc. output characteristics adjustable output voltage range v out 0.8 4.5 v note 2 reference feedback voltage v fb 0 . 8 v reference feedback voltage to l e r a n c e -3.0 +3.0 % t a = -40c to +25c -2.5 +2.5 % t a = +25c to +85c feedback input bias current i vfb 0 . 1n a output voltage tolerance fixed v out -3.0% v r +3.0% % t a = -40c to +25c, note 3 v out -2.5 v r +2.5 % t a = +25c to +85c, note 3 line regulation v line-reg 0 . 3% / v v in = v r + 1v to 5.5v, i out = 100 ma load regulation v load-reg 0 . 3 5 %v in =v r +1.5v, i load =100mato500ma internal oscillator frequency f osc 1.5 2.0 2.8 mhz start up time t ss 0 . 6m st r = 10% to 90% r dson p-channel r dson-p 5 0 0m ? i p =100ma r dson n-channel r dson-n 5 0 0m ? i n = 100 ma l x pin leakage current i lx -1.0 0.1 1.0 a shdn =0v, v in =5.5v, l x =0v, l x =5.5v positive current limit threshold +i lx(max) 8 6 0m a note 6 temperature specifications electrical specifications: unless otherwise indicated, all limits are specified for: v in + 2.7v to 5.5v parameters sym min typ max units conditions temperature ranges operating junction temperature range t j -40 +125 c steady state storage temperature range t a -65 +150 c maximum junction temperature t j +150 c transient package thermal resistances thermal resistance, 5l-tsot ? ja 207.4 c/w typical 4-layer board with internal ground plane thermal resistance, 8l-2x3 dfn ? ja 68 c/w typical 4-layer board with internal ground plane and 2-vias in thermal pad dc characteristics (continued) electrical characteristics: unless otherwise indicated, mcp1603/l, v in = shdn = 3.6v, c out = c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i out =100ma, t a = +25c. boldface specifications apply over the t a range of -40c to +85c. parameters sym min typ max units conditions note 1: the input voltage should be greater then the output voltage plus headroom voltage; higher load currents increase the input voltage required for regulation. mcp1603b device requires a minimum load for regulation. see section 2.0, typical performance curves for typical operating voltage ranges. 2: reference feedback voltage tolerance applies to adjustable output voltage setting. 3: v r is the output voltage setting. 4: the maximum allowable power dissipation is a function of ambient temperature, the maximum allowable temperature and the thermal resistance from junction to air (i.e. t a , t j , ? ja ). exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. 5: the internal mosfet switches have an integral diode from the l x pin to the v in pin, and from the l x pin to the gnd pin. in cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. thermal protection is not able to limit the junction temperature for these cases. 6: the current limit threshold is a cycle-by-cycle peak current limit. downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 7 mcp1603/b/l 2.0 typical performance curves note: unless otherwise indicated, mcp1603/l, v in = shdn =3.6v, c out =c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i load = 100 ma, t a = +25c. adjustable or fixed output voltage options can be used to generate the typical performance characteristics. figure 2-1: pfm i q vs. ambient temperature ( mcp1603/l ). figure 2-2: pwm i q vs. ambient temperature ( mcp1603b ). figure 2-3: efficiency vs. input voltage (v out = 1.2v). figure 2-4: pfm i q vs. input voltage ( mcp1603/l ). figure 2-5: pwm i q vs. input voltage ( mcp1603b ). figure 2-6: efficiency vs. output load (v out = 1.2v). note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 42 43 44 45 46 47 48 49 50 e scent current (a) v out = 1.8v v in = 4.2v v =30v v in = 3.6v 40 41 42 -40 -25 -10 5 20 35 50 65 80 95 110 125 qui e ambient temperature ( o c) v in =3 . 0v 2.7 2.8 2.9 3 3.1 3.2 3.3 s cent current (ma) v out = 1.8v v in = 3.0v v in = 3.6v v in = 4.2v 2.4 2.5 2.6 2.7 -40-25-10 5 2035506580 quie s ambient temperature ( o c) v in 3.6v 70 75 80 85 90 95 100 efficiency (%) v out = 1.2v i out = 100 ma i out = 500 ma i out = 300 ma 60 65 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 input voltage (v) 44 46 48 50 52 i escent current (a) t a = +25 o c t a = +90 o c 40 42 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 qu i input voltage (v) t a = -40 o c 2.6 2.8 3 3.2 3.4 s cent current (ma) t a = +25 o c t a = +90 o c v out = 1.8v 2 2.2 2.4 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 quie s input voltage (v) t a = -40 o c 30 40 50 60 70 80 90 100 e fficiency (%) v out = 1.2 v v in = 2.7v v in = 3.6v 0 10 20 30 0.1 1 10 100 1000 e output current (ma) out v in = 4.2v pfm/pwmpwm only downloaded from: http:/// mcp1603/b/l ds22042b-page 8 ? 2007-2012 microchip technology inc. note: unless otherwise indicated, mcp1603/l, v in = shdn =3.6v, c out =c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i load = 100 ma, t a = +25c. adjustable or fixed output voltage options can be used to generate the typical performance characteristics. figure 2-7: efficiency vs. input voltage (v out = 1.8v). figure 2-8: efficiency vs. output load (v out = 1.8v). figure 2-9: efficiency vs. input voltage (v out = 2.4v). figure 2-10: line regulation vs. ambient temperature (v out = 1.8v). figure 2-11: output voltage vs. load current (v out = 1.8v). figure 2-12: pfm/pwm efficiency vs. output load (v out = 2.4v). 80 85 90 95 100 efficiency (%) v out = 1.8v i out = 100 ma i out = 500 ma i out = 300 ma 70 75 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 input voltage (v) 30 40 50 60 70 80 90 100 e fficiency (%) v 18v v in = 4.2v v in = 2.7v v in = 3.6v 0 10 20 30 0.1 1 10 100 1000 e output current (ma) v out = 1 . 8v pfm/pwmpwm only 80 85 90 95 100 efficiency (%) v out = 2.4v i out = 100 ma i out = 500 ma i out = 300 ma 75 80 33 . 544 . 555 . 5 input voltage (v) 02 0.3 0.4 0.5 0.6 n e regualtion (%/v) i out = 100 ma i out = 300 ma v out = 1.8v 0.1 0 . 2 -40 -25 -10 5 20 35 50 65 80 95 110 125 li n ambient temperature ( o c) 1.76 1.77 1.78 1.79 1.80 1.81 1.82 o utput voltage (v) t a = +125 o c t a = -40 o c t a = +25 o c t a = +90 o c 1.74 1.75 100 150 200 250 300 350 400 450 500 o output current (ma) 30 40 50 60 70 80 90 100 e fficiency (%) v 24v v in = 4.2v v in = 2.7v v in = 3.6v 0 10 20 30 0.1 1 10 100 1000 e output current (ma) v out = 2 . 4v pfm/pwmpwm only downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 9 mcp1603/b/l note: unless otherwise indicated, mcp1603/l, v in = shdn =3.6v, c out =c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i load = 100 ma, t a = +25c. adjustable or fixed output voltage options can be used to generate the typical performance characteristics. figure 2-13: efficiency vs. input voltage (v out = 3.3v). figure 2-14: efficiency vs. output load (v out = 3.3v). figure 2-15: pwm-only device minimum load for regulation ( mcp1603b ). figure 2-16: switching frequency vs. ambient temperature. figure 2-17: switching frequency vs. input voltage. figure 2-18: switch resistance vs. input voltage. 90.0 92.5 95.0 97.5 100.0 efficiency (%) v out = 3.3v i out = 100 ma i out = 500 ma i out = 300 ma 85.0 87.5 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 input voltage (v) 40 50 60 70 80 90 100 e fficiency (%) v in = 4.2v v in = 3.6v 0 10 20 30 0.1 1 10 100 1000 e output current (ma) v out = 3.3 v pfm/pwmpwm only 3 4 5 6 7 8 9 10 o ad current (ma) t a = -40 o c t a = +25 o c t a =+85 o c regulation 0 1 2 3 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 l o v in -v out (v) t a = +85 c no regulation 2.05 2.10 2.15 2.20 h ing frequency (mhz) 1.95 2.00 -40 -25 -10 5 20 35 50 65 80 95 110 125 switc h ambient temperature ( o c) 200 2.05 2.10 2.15 2.20 h ing frequency (mhz) 1.95 2 . 00 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 switc h input voltage (v) 0.45 0.50 0.55 0.60 0.65 tch resistance () n-channel p-channel 0.35 0.40 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 swit input voltage (v) downloaded from: http:/// mcp1603/b/l ds22042b-page 10 ? 2007-2012 microchip technology inc. note: unless otherwise indicated, mcp1603/l, v in = shdn =3.6v, c out =c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i load = 100 ma, t a = +25c. adjustable or fixed output voltage options can be used to generate the typical performance characteristics. figure 2-19: switch resistance vs. ambient temperature. figure 2-20: output voltage startup waveform. figure 2-21: heavy load switching waveform. figure 2-22: pfm light load switching waveforms ( mcp1603/l ). figure 2-23: output voltage load step response vs. time. figure 2-24: output voltage line step response vs. time. 0.5 0.6 0.7 0.8 0.9 tch resistance () n-channel 0.3 0.4 -40 -25 -10 5 20 35 50 65 80 95 110 125 swit ambient temperature ( o c) p-channel downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 11 mcp1603/b/l note: unless otherwise indicated, mcp1603/l, v in = shdn =3.6v, c out =c in = 4.7 f, l = 4.7 h, v out (adj) = 1.8v, i load = 100 ma, t a = +25c. adjustable or fixed output voltage options can be used to generate the typical performance characteristics. figure 2-25: pwm light load switching waveforms ( mcp1603b ). i l =20ma/div v lx =2v/div i out =5ma 0.4 s/div v out =50mv/div, ac downloaded from: http:/// mcp1603/b/l ds22042b-page 12 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 13 mcp1603/b/l 3.0 pin descriptions the descriptions of the pins are listed in tab l e 3 - 1 . 3.1 power supply input voltage pin (v in ) connect the input voltage source to v in . the input source must be decoupled to gnd with a 4.7 f capacitor. 3.2 ground pin (gnd) ground pin for the device. the loop area of the ground traces should be kept as minimal as possible. 3.3 shutdown control input pin (shdn ) the shdn pin is a logic-level input used to enable or disable the device. a logic high (>45% of v in ) will enable the regulator output. a logic low (<15% of v in ) will ensure that the regulator is disabled. 3.4 feedback / output voltage pin (v fb /v out ) for adjustable output options, connect the center of the output voltage divider to the v fb /v out pin. for fixed- output voltage options, connect the output directly to the v fb /v out pin. 3.5 switch node, buck inductor connection pin (l x ) connect the l x pin directly to the buck inductor. this pin carries large signal-level current; all connections should be made as short as possible. 3.6 exposed metal pad (ep) for the dfn package, connect the exposed pad to gnd, with vias into the gnd plane. this connection to the gnd plane will aid in heat removal from the package. table 3-1: pin function table mcp1603/b tsot-23 mcp1603l tsot-23 mcp1603 2x3 dfn symbol description 147v in power supply input voltage pin 2 2 8 gnd ground pin 3 1 3 shdn shutdown control input pin 454 v fb /v out feedback / output voltage pin 531l x switch node, buck inductor connection pin 2, 5, 6 nc no connect exposed pad ep for the dfn package, the center exposed pad is a thermal path to remove heat from the device. electrically, this pad is at ground potential and should be connected to gnd. downloaded from: http:/// mcp1603/b/l ds22042b-page 14 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 15 mcp1603/b/l 4.0 detailed description 4.1 device overview the mcp1603/l is a synchronous buck regulator that operates in a pulse frequency modulation (pfm) mode or a pulse width modulation (pwm) mode to maximize system efficiency over the entire operating current range. capable of operating from a 2.7v to 5.5v input voltage source, the mcp1603 can deliver 500 ma of continuous output current. the mcp1603b device disables the pfm mode switching, and operates only in normal pwm mode. when using the mcp1603/b/l, the pcb area required for a complete step-down converter is minimized, since both the main p-channel mosfet and the synchro- nous n-channel mosfet are integrated. also while in pwm mode, the device switches at a constant frequency of 2.0 mhz (typical), which allows for small filtering components. both fixed and adjustable output voltage options are available. the fixed voltage options (1.2v, 1.5v 1.8v, 2.5v, 3.3v) do not require an external voltage divider, which further reduces the required circuit board footprint. the adjustable output voltage options allow for more flexibility in the design, but require an external voltage divider. additionally, the device features an undervoltage lock- out (uvlo), overtemperature shutdown, overcurrent protection and enable/disable control. 4.2 synchronous buck regulator the mcp1603/l has two distinct modes of operation that allow the device to maintain a high level of efficiency throughout the entire operating current and voltage range. the device automatically switches between pwm mode and pfm mode, depending on the output load requirements. mcp1603b switches in pwm mode only. 4.2.1 pfm/pwm mode device option ( mcp1603/l ) during heavy load conditions, the mcp1603/l operates at a high, fixed switching frequency of 2.0 mhz (typical) using current mode control. this minimizes output ripple (10 C 15 mv, typically) and noise, while maintaining high efficiency (88% typical with v in =3.6v, v out =1.8v, i out = 300 ma). during normal pwm operation, the beginning of a switching cycle occurs when the internal p-channel mosfet is turned on. the ramping inductor current is sensed and tied to one input of the internal high-speed comparator. the other input to the high-speed comparator is the error amplifier output. this is the difference between the internal 0.8v reference and the divided-down output voltage. when the sensed current becomes equal to the amplified error signal, the high- speed comparator switches states and the p-channel mosfet is turned off. the n-channel mosfet is turned on until the internal oscillator sets an internal rs latch, initiating the beginning of another switching cycle. pfm-to-pwm mode transition is initiated for any of the following conditions: continuous device switching output voltage has dropped out of regulation 4.2.1.1 light load, pfm mode during light-load conditions, the mcp1603/l operates in a pfm mode. when the mcp1603/l enters this mode, it begins to skip pulses to minimize unnecessary quiescent-current draw by reducing the number of switching cycles per second. the typical quiescent cur- rent draw for this device is 45 a. pwm-to-pfm mode transition is initiated for any of the following conditions: discontinuous inductor current is sensed for a set duration inductor peak current falls below the transition threshold limit 4.2.2 pwm mode device option ( mcp1603b ) there are applications that cannot tolerate the low frequency pulse skipping mode or the output ripple voltage associated with it, which is distinctive for pfm switching. the mcp1603b device has disabled the pfm mode switching. it operates only in normal pwm mode over the entire load range (without skipping pulses). during periods of light load operation, the mcp1603b continues to operate at a constant 2 mhz switching frequency, keeping the output ripple voltage lower than pfm mode. because there are no skipping pulses, a minimum load current is necessary to keep output in regulation (see figure 2-15 , without a minimum load, the output voltage will be greater than the set point). the minimum load value depends on the input-to- output ratio. downloaded from: http:/// mcp1603/b/l ds22042b-page 16 ? 2007-2012 microchip technology inc. 4.3 soft start the output of the mcp1603 is controlled during start- up. this control allows for a very minimal amount of v out overshoot during start-up from v in rising above the uvlo voltage or shdn being enabled. 4.4 overtemperature protection overtemperature protection circuitry is integrated in the mcp1603/b/l device family. this circuitry monitors the device junction temperature and shuts the device off, if the junction temperature exceeds the typical +150c threshold. if this threshold is exceeded, the device will automatically restart once the junction temperature drops by approximately 10c. the soft start is reset during an overtemperture condition. 4.5 overcurrent protection cycle-by-cycle current limiting is used to protect the mcp1603/b/l device family from being damaged when an external short circuit is applied. the typical peak current limit is 860 ma. if the sensed current reaches the 860 ma limit, the p-channel mosfet is turned off, even if the output voltage is not in regulation. the device will attempt to start a new switching cycle when the internal oscillator sets the internal rs latch. 4.6 enable/disable control the shdn pin is used to enable or disable the mcp1603/b/l. when the shdn pin is pulled low, the device is disabled. when pulled high, the device is enabled and begins operation, unless the input voltage is below the uvlo threshold or a fault condition exists. 4.7 undervoltage lockout (uvlo) the uvlo feature uses a comparator to sense the input voltage (v in ) level. if the input voltage is lower than the voltage necessary to properly operate the mcp1603, the uvlo feature will hold the converter off. when v in rises above the necessary input voltage, the uvlo is released and soft start begins. hysteresis is built into the uvlo circuit to compensate for input impedance. for example, if there is any resistance between the input voltage source and the device when it is operating, there will be a voltage drop at the input to the device equal to i in xr in . the typical hysteresis is 140 mv. downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 17 mcp1603/b/l 5.0 application information 5.1 typical applications the mcp1603/b/l 500 ma synchronous buck regulator operates over a wide input voltage range (2.7v to 5.5v) and is ideal for single-cell li-ion battery- powered applications, usb-powered applications, three cell nimh or nicd applications and 3v or 5v regulated input applications. the 5-lead tsot and 8- lead 2 x 3 dfn packages provide a small footprint with minimal external components. 5.2 fixed output voltage applications the typical application circuit shows a fixed mcp1603/b/l in an application used to convert three nimh batteries into a well-regulated 1.8v @ 500 ma output. a 4.7 f input capacitor, 4.7 f output capacitor, and a 4.7 h inductor make up the entire external component solution for this application. no external voltage divider or compensation is necessary. in addition to the fixed 1.8v option, the mcp1603 is also available in 1.2v, 1.5v, 2.5v, or 3.3v fixed voltage options. 5.3 adjustable output voltage applications when the desired output for a particular application is not covered by the fixed-voltage options, an adjustable mcp1603/b/l can be used. the circuit listed in figure 6-2 shows an adjustable device being used to convert a 5v rail to 1.0v @ 500 ma. the output voltage is adjustable by using two external resistors as a volt- age divider. for adjustable-output voltages, it is recommended that the top resistor divider value be 200 k ? . the bottom resistor value can be calculated using the following equation: equation 5-1: for adjustable output applications, an additional r-c compensation network is necessary for control loop stability. recommended values for any output voltage are: refer to figure 6-2 for proper placement of r comp and c comp . 5.4 input capacitor selection the input current to a buck converter, when operating in continuous conduction mode, is a squarewave with a duty cycle defined by the output voltage (v out ) to input voltage (v in ) relationship of v out /v in . to prevent undesirable input voltage transients, the input capacitor should be a low-esr type with an rms current rating given by equation 5.5 . because of their small size and low esr, ceramic capacitors are often used. ceramic material x5r or x7r are well suited, since they have a low-temperature coefficient and acceptable esr. equation 5-2: table 5-1 contains the recommend range for the input capacitor value. 5.5 output capacitor selection the output capacitor helps provide a stable output voltage during sudden load transients, smooths the current that flows from the inductor to the load, and reduces the output voltage ripple. therefore, low-esr capacitors are a desirable choice for the output capac- itor. as with the input capacitor, x5r and x7r ceramic capacitors are well suited for this application. the output ripple voltage is often a design specifica- tion. a buck converters output ripple voltage is a function of the charging and discharging of the output capacitor and the esr of the capacitor. this ripple voltage can be calculated by equation 5-3 . equation 5-3: table 5-1 contains the recommend range for the output capacitor value. r bot r top v fb v out v fb ? ---------------------------- - ?? ?? ? = example: r top =200k ? v out =1.0v v fb =0.8v r bot =200k ? x (0.8v/(1.0v C 0.8v)) r bot =800k ?? (standard value = 787 k ? ) r comp =4.99k ? c comp =33pf table 5-1: capacitor value range c in c out minimum 4.7 f 4.7 f maximum 22 f i cin rms , i out max , v out v in v out ? ?? ? v in ----------------------------------------------------- - ?? ?? ?? ? = ? v out ? i l esr ? ? i l 8fc ? ? -------------------- - + = downloaded from: http:/// mcp1603/b/l ds22042b-page 18 ? 2007-2012 microchip technology inc. 5.6 inductor selection when using the mcp1603, the inductance value can range from 3.3 h to 10 h. an inductance value of 4.7 h is recommended to achieve a good balance between converter load transient response and minimized noise. the value of inductance is selected to achieve a desired amount of ripple current. it is reasonable to assume a ripple current that is 20% of the maximum load current. the larger the amount of ripple current allowed, the larger the output capacitor value becomes to meet ripple voltage specifications. the inductor ripple current can be calculated according to the following equation. equation 5-4: when considering inductor ratings, the maximum dc current rating of the inductor should be at least equal to the maximum load current, plus one half the peak-to- peak inductor ripple current (1/2 x ? i l ). the inductor dc resistance adds to the total converter power loss. an inductor with a low dc resistance allows for higher converter efficiency. 5.7 thermal calculations the mcp1603 is available in two different packages (tsot-23 and 2x3 dfn). the junction temperature is estimated by calculating the power dissipation and applying the package thermal resistance ( ? ja ). the maximum continuous junction temperature rating for the mcp1603 is +125c. to quickly estimate the internal power dissipation for the switching buck regulator, an empirical calculation using measured efficiency can be used. given the measured efficiency, the internal power dissipation is estimated by the following equation: equation 5-5: the difference between the first term, input power dissipation, and the second term, power delivered, is the internal power dissipation. this is an estimate assuming that most of the power lost is internal to the mcp1603. there is some percentage of power lost in the buck inductor, with very little loss in the input and output capacitors. table 5-2: mcp1603 recommended inductors part number value (h) dcr ? (max) i sat (a) size wxlxh (mm) coiltronics ? sd3110 3.3 0.195 0.81 3.1x3.1x1.0 sd3110 4.7 0.285 0.68 3.1x3.1x1.0 sd3110 6.8 0.346 0.58 3.1x3.1x1.0 sd3812 3.3 0.159 1.40 3.8x3.8x1.2 sd3812 4.7 0.256 1.13 3.8x3.8x1.2 sd3812 6.8 0.299 0.95 3.8x3.8x1.2 wrth elektronik ? we-tpc type xs 3.3 0.225 0.72 3.3x3.5x0.95 we-tpc type xs 4.7 0.290 0.50 3.3x3.5x0.95 we-tpc type s 4.7 0.105 0.90 3.8x3.8x1.65 we-tpc type s 6.8 0.156 0.75 3.8x3.8x1.65 we-tpc type tiny 4.7 0.100 1.7 2.8x2.8x2.8 ? i l v out f sw l ? ------------------- 1 v out v in ------------ - ? ?? ?? ? = where: f sw = switching frequency sumida ? cmd4d06 3.3 0.174 0.77 3.5x4.3x0.8 cmd4d06 4.7 0.216 0.75 3.5x4.3x0.8 cmd4d06 6.8 0.296 0.62 3.5x4.3x0.8 coilcraft ? xfl3012- 332me_ 3.3 0.106 1.2 3x3x1.2 xfl3012- 472me_ 4.7 0.143 1.0 3x3x1.2 lps4018- 103ml_ 10 0.200 1.2 4x4x1.8 tdk-epc ? b82462_ g4472m 4.7 0.04 1.8 6x6x3 vls3015e t-4r7m 4.7 0.113 1.1 3x3x1.5 table 5-2: mcp1603 recommended inductors (continued) part number value (h) dcr ? (max) i sat (a) size wxlxh (mm) v out i out ? efficiency ------------------------------------- ?? ?? v out i out ? ?? ? p diss = downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 19 mcp1603/b/l 5.8 pcb layout information good printed circuit board layout techniques are important to any switching circuitry, and switching power supplies are no different. when wiring the high- current paths, short and wide traces should be used. this high-current path is shown with red connections in figure 5-1 . the current in this path is switching. therefore, it is important that the components along the high-current path should be placed as close as possi- ble to the mcp1603 to minimize the loop area. the feedback resistors and feedback signal should be routed away from the switching node and this switching current loop. when possible, ground planes and traces should be used to help shield the feedback signal and minimize noise and magnetic interference. figure 5-1: pcb high current path. v in shdn gnd v fb l x v in 2.7v to 4.5v v out 1.8v @ 500 ma c out 4.7 f c in 4.7 f l 1 4.7 h downloaded from: http:/// mcp1603/b/l ds22042b-page 20 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 21 mcp1603/b/l 6.0 typical application circuits l figure 6-1: single li-ion to 1.5v @ 500 ma application. figure 6-2: 5v to 1.0v @ 500 ma application. figure 6-3: three nimh batteries to 1.2v @ 500 ma application. v in shdn gnd v fb l x v in 3.0v to 4.2v v out 1.5v @ 500 ma c out 4.7 f c in 4.7 f l 1 4.7 h r top 200 k ? r bot 787 k ? v in shdn gnd v fb l x v in 5.0v v out 1.0v @ 500 ma c out 4.7 f c in 4.7 f l 1 4.7 h r comp 4.99 k ? c comp 33 pf v in shdn gnd v fb l x v in 2.7v to 4.5v v out 1.2v @ 500 ma c out 4.7 f c in 4.7 f l 1 4.7 h downloaded from: http:/// mcp1603/b/l ds22042b-page 22 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 23 mcp1603/b/l 7.0 packaging information 7.1 package marking information 8-lead 2x3 dfn example : legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e part number code mcp1603-120i/mc afm mcp1603t-120i/mc afm mcp1603-150i/mc afk mcp1603t-150i/mc afk mcp1603-180i/mc afj mcp1603t-180i/mc afj mcp1603-250i/mc afg mcp1603t-250i/mc afg mcp1603-330i/mc afa mcp1603t-330i/mc afa mcp1603-adji/mc afq mcp1603t-adji/mc afq part number code mcp1603t-120i/os etnn mcp1603t-150i/os eunn mcp1603t-180i/os evnn mcp1603t-250i/os ewnn mcp1603t-330i/os exnn mcp1603t-adji/os eynn mcp1603bt-180i/os gbnn mcp1603bt-330i/os genn mcp1603bt-adji/os gann mcp1603lt-120i/os fmnn mcp1603lt-150i/os fknn mcp1603lt-180i/os ejnn mcp1603lt-250i/os fgnn mcp1603lt-330i/os fann mcp1603lt-adji/os fqnn afm 235 25 5-lead tsot-23 example : et25 downloaded from: http:/// mcp1603/b/l ds22042b-page 24 ? 2007-2012 microchip technology inc. ! "#$ %! & '(!%&! %( %")% % % " & "* " %!"& "$ % ! "$ % ! %#" +&& " , & "% *- + ./0 . & % # % ! ))% !%% *10 $ & '! ! )% !%% '$ $ & % ! 1 % & %! % 2 " ) ' % 2 $ % %" % %% 033)))& &3 2 4% 55* * & 5&% 6 67 8 6!&( $5 " 6 + 5 " % +./ 7!% "5 " % ./ 7 9 % : : "" 2 2 % " $$ : 7 ;"% * <./ "" 2 ;"% * =./ 7 5% ./ 1 %5% 5 , + = 1 % % 5 =*1 1 % > > <> 5 " 2 < : 5 ";"% ( , : + " $% > > > " $%. %% & > > > n b e e1 note 1 d e1 e 1 2 3 a a1 a2 c l1 l ) / <. downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 25 mcp1603/b/l note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// mcp1603/b/l ds22042b-page 26 ? 2007-2012 microchip technology inc. ! "#$ %! & '(!%&! %( %")% % % " 2 & & # "%( %" , 2 ) ! %" & "% *- + ./0 . & % # % ! ))% !%% *10 $ & '! ! )% !%% '$ $ & % ! 1 % & %! % 2 " ) ' % 2 $ % %" % %% 033)))& &3 2 4% 55* * & 5&% 6 67 8 6!&( $ 6 < % +./ 7 9 % < % " $$ + / % % 2 , *1 7 5% ./ 7 ;"% * ,./ *# " "5% , : ++ *# " ";"% * + : + / % %;"% ( + , / % %5% 5 , + / % %% *# " " ? : : d n e note 1 1 2 exposed pad note 1 2 1 d2 k l e2 n e b a3 a1 a note 2 bottom view top view ) / ,/ downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 27 mcp1603/b/l note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// mcp1603/b/l ds22042b-page 28 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 29 mcp1603/b/l appendix a: revision history revision b (october 2012) the following is the list of modifications: 1. added new device option (mcp1603b) with pwm mode only. added details on this device throughout the document. 2. updated typical application circuit graphic to show both available options for the mcp1603/b/l family. 3. added new graphics to section 2.0, typical performance curves : figures 2-2 , 2-5 , 2-15 and 2-25 . updated figures 2-6 , 2-8 , 2-12 and 2-14 . 4. restructured section 4.2, synchronous buck regulator to show both pfm/pwm and pwm- only modes. 5. updated ta b l e 5 - 2 . 6. updated section 7.1, package marking information with available marking codes and package specification drawings. 7. updated the product identification system section. revision a (may 2007) original release of this document. downloaded from: http:/// mcp1603/b/l ds22042b-page 30 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 31 mcp1603/b/l product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . device: mcp1603: 2.0 mhz, 500 ma buck regulator with pfm/pwm mode mcp1603b: 2.0 mhz, 500 ma buck regulator with pwm-only mcp1603l: 2.0 mhz, 500 ma buck regulator with pfm/pwm mode and alternate pinout voltage option: mcp1603 mcp1603b mcp1603l adj = adjustable x x x 120 = 1.20v standard x x 150 = 1.50v standard x x 180 = 1.80v standard x x x 250 = 2.50v standard x x 330 = 3.30v standard x x x temperature: i = -40c to +85c package type: mc = plastic dual-flat no-lead package (mc), 8-lead os = plastic thin small outline transistor (os), 5-lead examples: a) mcp1603-180i/mc: 1.80v buck regulator, industrial temperature, 8ld-dfn package b) mcp1603t-180i/mc: tape and reel, 1.80v buck regulator, industrial temperature, 8ld-dfn package c) mcp1603t-180i/os: tape and reel 1.80v buck regulator, industrial temperature, 5ld-tsot package a) mcp1603bt-180i/os: tape and reel, 1.80v buck regulator with pwm only, industrial temperature, 5ld-tsot package a) mcp1603lt-180i/os: tape and reel, 1.80v buck regulator with alternate tsot pinout, industrial temperature, 5ld-tsot package. part no. -xxx voltage option device x temperature /xx package downloaded from: http:/// mcp1603/b/l ds22042b-page 32 ? 2007-2012 microchip technology inc. notes: downloaded from: http:/// ? 2007-2012 microchip technology inc. ds22042b-page 33 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyers risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, app lication maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z-scale are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. & kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2007-2012, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 978-1-62076-632-3 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory an d analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified. quality management s ystem certified by dnv == iso/ts 16949 == downloaded from: http:/// ds22042b-page 34 ? 2007-2012 microchip technology inc. americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: http://www.microchip.com/ support web address: www.microchip.com atlanta duluth, ga tel: 678-957-9614 fax: 678-957-1455 boston westborough, ma tel: 774-760-0087 fax: 774-760-0088 chicago itasca, il tel: 630-285-0071 fax: 630-285-0075 cleveland independence, oh tel: 216-447-0464 fax: 216-447-0643 dallas addison, tx tel: 972-818-7423 fax: 972-818-2924 detroit farmington hills, mi tel: 248-538-2250 fax: 248-538-2260 indianapolis noblesville, in tel: 317-773-8323 fax: 317-773-5453 los angeles mission viejo, ca tel: 949-462-9523 fax: 949-462-9608 santa clara santa clara, ca tel: 408-961-6444 fax: 408-961-6445 toronto mississauga, ontario, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific asia pacific office suites 3707-14, 37th floor tower 6, the gateway harbour city, kowloon hong kong tel: 852-2401-1200 fax: 852-2401-3431 australia - sydney tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing tel: 86-10-8569-7000 fax: 86-10-8528-2104 china - chengdu tel: 86-28-8665-5511 fax: 86-28-8665-7889 china - chongqing tel: 86-23-8980-9588 fax: 86-23-8980-9500 china - hangzhou tel: 86-571-2819-3187 fax: 86-571-2819-3189 china - hong kong sar tel: 852-2401-1200 fax: 852-2401-3431 china - nanjing tel: 86-25-8473-2460 fax: 86-25-8473-2470 china - qingdao tel: 86-532-8502-7355 fax: 86-532-8502-7205 china - shanghai tel: 86-21-5407-5533 fax: 86-21-5407-5066 china - shenyang tel: 86-24-2334-2829 fax: 86-24-2334-2393 china - shenzhen tel: 86-755-8203-2660 fax: 86-755-8203-1760 china - wuhan tel: 86-27-5980-5300 fax: 86-27-5980-5118 china - xian tel: 86-29-8833-7252 fax: 86-29-8833-7256 china - xiamen tel: 86-592-2388138 fax: 86-592-2388130 china - zhuhai tel: 86-756-3210040 fax: 86-756-3210049 asia/pacific india - bangalore tel: 91-80-3090-4444 fax: 91-80-3090-4123 india - new delhi tel: 91-11-4160-8631 fax: 91-11-4160-8632 india - pune tel: 91-20-2566-1512 fax: 91-20-2566-1513 japan - osaka tel: 81-66-152-7160 fax: 81-66-152-9310 japan - yokohama tel: 81-45-471- 6166 fax: 81-45-471-6122 korea - daegu tel: 82-53-744-4301 fax: 82-53-744-4302 korea - seoul tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 malaysia - kuala lumpur tel: 60-3-6201-9857 fax: 60-3-6201-9859 malaysia - penang tel: 60-4-227-8870 fax: 60-4-227-4068 philippines - manila tel: 63-2-634-9065 fax: 63-2-634-9069 singapore tel: 65-6334-8870 fax: 65-6334-8850 taiwan - hsin chu tel: 886-3-5778-366 fax: 886-3-5770-955 taiwan - kaohsiung tel: 886-7-536-4818 fax: 886-7-330-9305 taiwan - taipei tel: 886-2-2500-6610 fax: 886-2-2508-0102 thailand - bangkok tel: 66-2-694-1351 fax: 66-2-694-1350 europe austria - wels tel: 43-7242-2244-39 fax: 43-7242-2244-393 denmark - copenhagen tel: 45-4450-2828 fax: 45-4485-2829 france - paris tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany - munich tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy - milan tel: 39-0331-742611 fax: 39-0331-466781 netherlands - drunen tel: 31-416-690399 fax: 31-416-690340 spain - madrid tel: 34-91-708-08-90 fax: 34-91-708-08-91 uk - wokingham tel: 44-118-921-5869 fax: 44-118-921-5820 worldwide sales and service 11/29/11 downloaded from: http:/// |
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