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www.fairchildsemi.com rev. 1.0.2 6/22/04 features 95% ef?iency, synchronous operation adjustable output voltage option from 0.7v to v in 2.5v to 5.5v input voltage range customized fixed output voltage options up to 300ma output current fixed frequency 1mhz pwm operation high ef?iency power save mode 100% duty cycle low dropout operation soft start dynamic output voltage positioning ?5 a quiescent current excellent load transient response 5-lead sot-23 package 6-lead mlp 3x3mm package applications pocket pcs, pdas cell phones battery-powered portable devices digital cameras ? ow power dsp supplies description the fan5307, a high ef?iency low noise synchronous pwm current mode and pulse skip (power save) mode dc-dc converter is designed for battery-powered applica- tions. it provides up to 300ma of output current over a wide input range from 2.5v to 5.5v. the output voltage can be either internally ?ed or externally adjustable over a wide range of 0.7v to 5.5v by an external voltage divider. custom output voltages are also available. at moderate and light loads pulse skipping modulation is used. dynamic voltage positioning is applied, and the output v oltage is shifted 0.8% above nominal value for increased headroom during load transients. at higher loads the system automatically switches to current mode pwm control, operating at 1 mhz. a current mode control loop with fast transient response ensures excellent line and load regulation. in power save mode, the quiescent current is reduced to 15 a in order to achieve high ef?iency and to ensure long battery life. in shut-down mode, the supply current drops below 1 a. the device is available in 5-lead sot-23 and 6-lead mlp 3x3mm packages. t ypical application efficiency vs. load current v out = 1.8v load current [ ma ] 0.01 0.1 1 10 100 1000 efficiency [%] 65 70 75 80 85 90 95 100 v in =2.5v v in =3.6v v in =5.5v f an5307 high-ef?iency step-down dc-dc converter
product specification fan5307 2 rev. 1.0.2 6/22/04 pin assignment pin description 5sot-23 pin description 6-lead 3x3mm mlp pin no. pin name pin description 1v in supply voltage input. 2 gnd ground. 3e n enable input. logic high enables the chip and logic low disables the chip and reduces supply current to <1 a. do not float this pin. 4 fb feedback input. in case of fixed voltage options, connect this pin directly to the output. for an adjustable voltage option, connect this pin to the resistor divider. 5l x inductor pin. this pin is connected to the internal mosfet switches. pin no. pin name pin description 1e n enable input. logic high enables the chip and logic low disables the chip and reduces supply current to <1 a. do not float this pin. 2 gnd reference ground. 3v in supply voltage input. 4 l x inductor pin. this pin is connected to the internal mosfet switches. 5 pgnd power ground. internal n-channel mosfet is connected to this pin. 6f b feedback input. in case of fixed voltage options, connect this pin directly to the output. for an adjustable voltage option, connect this pin to the resistor divider.
fan5307 product specification rev. 1.0.2 6/22/04 3 absolute maximum ratings recommended operating conditions notes: 1. junction to ambient thermal resistance, ja , is a strong function of pcb material, board thickness, thickness and number of copper planes, number of vias used, diameter of via used, available copper surface, and attached heat sink characteristics. 2. using mil std. 883e, method 3015.7(human body model) and eia/jesd22c101-a (charge device model). 3. refer to the applications section for further details. p arameter min max unit v in -0.3 6.5 v voltage on any other pin gnd-0.3 v in + 0.3 v thermal resistance (note 1) junction to case, sot-23 130 ?/w j unction to tab, mlp 3x3 8 lead soldering temperature (10 seconds) 260 ? storage temperature -65 150 ? electrostatic discharge (esd) protection level (note 2) hbm 4 kv cdm 1 p arameter min typ max unit supply voltage range 2.5 5.5 v output voltage range, adjustable version 0.7 v in v output current 300 ma inductor (note 3) 10 h input capacitor (note 3) 4.7 f output capacitor (note 3) 10 f operating ambient temperature range -40 +85 ? operating junction temperature range -40 +125 ?
product specification fan5307 4 rev. 1.0.2 6/22/04 general electrical characteristics electrical characteristics for adjustable version v in = 2.5v to 5.5v, i out = 200ma, en = v in , c in = 4.7?, c out = 22?, l x = 10?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = 25?. p arameter conditions min. typ. max. units input voltage 2.5 5.5 v quiescent current i out = 0ma, device is not switching 15 30 a shutdown supply current en = gnd 0.1 1 a enable high input voltage 1.3 v enable low input voltage 0.4 v en input bias current en = v in or gnd 0.01 0.1 a pmos on resistance v in = v gs = 3.6v 530 690 m ? v in = v gs = 2.5v 670 850 nmos on resistance v in = v gs = 3.6v 430 540 m ? v in = v gs = 2.5v 530 660 p-channel current limit 2.5v < v in < 5.5v 400 520 700 ma n-channel leakage current v ds = 5.5v 0.1 1 a p-channel leakage current v ds = 5.5v 0.1 1 a switching frequency 800 1000 1200 khz line regulation v in = 2.5 to 5.5v, i out = 10ma 0.16 %/v load regulation 6-lead 3x3mm mlp 0.0014 %/ma load regulation 5-lead sot-23 0.0022 %/ma output voltage accuracy (5sot- 23) v in = 2.5 to 4.5v, -3 3 % v in = 2.5 to 5.5v, -4 3 % leakage current into sw pin v in > v out , 0.1 1 a reverse leakage current into pin sw v in = open, en = gnd, v sw = 5.5v 0.1 1 a output voltage accuracy (6-lead 3x3mm mlp) v in = 2.5 to 5.5v, -3 3 % v in = 2.5v to 5.5v, i out = 200ma, en = v in , c in = 4.7?, c out = 22?, l x = 10?, t a = 25?. p arameter conditions min. typ. max. units feedback (fb) voltage 0.5 v 10 0ma i out 30 0ma ? 10 0ma i out 300 m a ? 0 ma i out 30 0ma ? 0 ma i out 30 0ma ? 0v v sw v in ? 0 ma i out 30 0ma ?
fan5307 product specification rev. 1.0.2 6/22/04 5 electrical characteristics for fixed v out = 1.8v version note: 4. transition voltage is defined as the difference between the output voltage measured at 0.1m a (pfm mode) and 300ma (pwm mode), respectively. 5. 6. these limits also apply to any mode transition caused by any kind of load transition within specified output current range. v in = 2.5v to 5.5v, i out = 200ma, en = v in , c in = 4.7?, c out = 22?, l x = 10?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = 25?. p arameter conditions min. typ. max. units pfm to pwm transition voltage (note 4) v in = 3.7v, t a = 25?, 72 mv pfm to pwm transition voltage (note 4) v in = 4.2v, t a = 25?, 72 mv output voltage during mode transition (note 5, 6) 1.7 1.93 v over voltage clamp threshold incl. line, load, load transients, and temperature 1.878 1.93 v 0. 1ma i out 300 m a ? 0. 1ma i out 300 m a ? 0.01 0.587 0.589 time (msec) i load (ma) s s 0 4.6 2 200 load transient response test waveform t r = 10 s t f = 2 s
product specification fan5307 6 rev. 1.0.2 6/22/04 t ypical performance characteristics (t a = 25?, c in = c out = 10?, l = 10?, v out = 1.8v, unless otherwise noted.) efficiency vs. load current v out = 1.8v load current [ma] 0.01 0.1 1 10 100 1000 efficiency [%] 65 70 75 80 85 90 95 100 no load quiescent current vs. input voltage input voltage [v] 2.5 3.0 3.5 4.0 4.5 5.0 5.5 no load quiescent current [a] 14 16 18 20 22 24 26 t a =+85? t a =+25? t a =-40? v in =2.5v v in =3.6v v in =5.5v -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 temperature [?] frequency [khz] 880 900 920 940 960 980 1000 1020 1040 1060 frequency vs. temperature v in =2.5v v in =3.6v v in =5.5v power save (pfm) mode operation start-up line transient response load transient response
product specification fan5307 7 rev. 1.0.2 6/22/04 detailed operation description the fan5307 is a step-down converter operating in a current-mode pfm/pwm architecture with a typical switch- ing frequency of 1mhz. at moderate to heavy loads, the con- v erter operates in pulse-width-modulation (pwm) mode. at light loads the converter enters a power-save mode (pfm pulse skipping) to keep the ef?iency high. pwm mode in pwm mode, the device operates at a ?ed frequency of 1mhz. at the beginning of each clock cycle, the p-channel transistor is turned on. the inductor current ramps up and is monitored via an internal circuit. the p-channel switch is turned off when the sensed current causes the pwm compar- ator to trip when the output voltage is in regulation or when the inductor current reaches the current limit (set internally to typically 520ma). after a minimum dead time the n- channel transistor is turned on and the inductor current ramps down. as the clock cycle is completed, the n-channel switch is turned off and the next clock cycle starts. pfm (power save) mode as the load current decreases and the peak inductor current no longer reaches the typical threshold of 80ma, the con- v erter enters pulse-frequency-modulation (pfm) mode. in pfm mode the device operates with a variable frequency and constant peak current thus reducing the quiescent current to minimum. consequently, the high ef?iency is maintained at light loads. as soon as the output voltage falls below a threshold, set at 0.8% above the nominal value, the p-chan- nel transistor is turned on and the inductor current ramps up. the p-channel switch turns off and the n-channel turns on as the peak inductor current is reached (typical 140ma). the n-channel transistor is turned off before the inductor current becomes negative. at this time the p-channel is switched on again starting the next pulse. the converter continues these pulses until the high threshold (typical 1.6% above nominal value) is reached. a higher output voltage in block diagram fb error amplifier ref fb ref is is current sense neg. limit sense digital soft start under voltage lockout logic control mosfet driver osc slope compensation pfm comparator comparator over voltage comparator neg. limit comparator is gnd lx v in en gnd 0.5v
product specification fan5307 8 rev. 1.0.2 6/22/04 pfm mode gives additional headroom for the voltage drop during a load transient from light to full load. the voltage ov ershoot during this load transient is also minimized due to active regulation during turning on the n-channel recti?r switch. the device stays in sleep mode until the output v oltage falls below the low threshold. the fan5307 enters the pwm mode as soon as the output voltage can no longer be regulated in pfm with constant peak current. 100% duty cycle operation as the input voltage approaches the output voltage and the duty cycle exceeds the typical 95%, the converter turns the p-channel transistor continuously on. in this mode the output v oltage is equal to the input voltage minus the voltage drop across the p-channel transistor: v out = v in ?i load (r ds on + r l ), where r ds on = p-channel switch on resistance i load = output current r l = inductor dc resistance soft start the fan5307 has an internal soft-start circuit that limits the inrush current during start-up. this prevents possible voltage drops of the input voltage and eliminates the output voltage ov ershoot. the soft-start is implemented as a digital circuit increasing the switch current in four steps to the p-channel current limit (520ma). typical start-up time for a 10? out- put capacitor and a load current of 200ma is 500?. short-circuit protection the switch peak current is limited cycle by cycle to a typical v alue of 520ma. in the event of a output voltage short circuit the device operates at minimum duty cycle, therefore the av erage input current is typically 100ma.
fan5307 product specification rev. 1.0.2 6/22/04 9 application information adjustable output voltage version the output voltage for the adjustable version is set by the e xternal resistor divider, as shown below: and is calculated as: to reduce noise sensitivity, r1 + r2 should not exceed 800k ? . inductor selection the inductor parameters directly related to device perfor- mances are saturation current and dc resistance. the f an5307 operates with a typical inductor value of 10?. the lower the dc resistance, the higher the ef?iency. for saturation current, the inductor should be rated higher than the maximum load current plus half of the inductor ripple current that is calculated as follows: where: f = switching frequency l = inductor value ? i l = inductor ripple current input capacitor selection f or best performances, a low esr input capacitor is required. a ceramic capacitor of at least 4.7?, placed as close to the input pin of the device is recommended. output capacitor selection the fan5307s switching frequency of 1mhz allows the use of a low esr ceramic capacitor with a value of 10? to 22?. this provides low output voltage ripple. in power save mode the output voltage ripple is independent of the output capacitor value and the ripple is determined by the internal comparator thresholds. the typical output voltage ripple at light load is 1% of the nominal output voltage. pcb layout recommendations the inherently high peak currents and switching frequency of the power supplies require a careful pcb layout design. therefore, use wide traces for the high current path and place the input capacitor, the inductor, and the output capaci- tor as close as possible to the integrated circuit terminals. for the adjustable version the resistor divider should be routed aw ay from the inductor to avoid electromagnetic interfer- ence. the 6-lead mlp version of the fan5307 separates the high current ground from the reference ground, therefore it is more tolerant to the pcb layout design and shows better per- formance. inductor v alue vendor part number performance 10? sumida cdrh5d28-100 high efficiency cdrh5d18-100 cdrh4d28-100 murata lqh66sn100m 01l 6.8? sumida cdrh3d16-6r8 smallest solution 10? cdrh4d18-100 cr32-100 cr43-100 murata lqh4c100k04 ta b le 1: recommended inductors 10 h 10f 4.7 f f an5307sx 1 3 4 5 2 v in v out gnd en fb l x c f r1 r2 4.7pf v out 0.5 v 1 r 1 r 2 ------ + = ? i l v out 1v out v in ? () lf -------------------------------------------------- = capacitor v alue vendor part number 4.7? taiyo yuden jmk212by475mg 10? jmk212bj106mg jmk316bj106kl tdk c12012x5roj106k c3216x5roj106m 22? murata grm32dr60j226k ta b le 2: recommended capacitors
product specification fan5307 10 rev. 1.0.2 6/22/04 mechanical dimensions 6-lead 3x3mm mlp package 0.15 c 2x 3.0 2.6 2.6 0.15 c 2x 0.10 c 2x 0.10 c 2x 0.10 c 0.08 c 1.0 max seating plane 0?12 (0.20) 2.25 0.2 min 0.95 1.90 1.65 0.30~0.45 0.10 m c c ab 1 3 6 4 a 3.0 1.85 2.15 (0.65) recommended land pattern 2.45 3.45 0.65 typ 0.95 typ t op view 1.00 0.65 0.05 0.00 0.45 0.20 side view notes: a. conforms to jedec registration mo-229, v ariation veea, dated 11/2001 b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994 bottom view b c 0.05 m
fan5307 product specification rev. 1.0.2 6/22/04 11 mechanical dimensions 5-lead sot-23 package symbol inches millimeters notes min max min max a .035 .057 .90 1.45 a1 .000 .006 .00 .15 b .008 .020 .20 .50 c .003 .010 .08 .25 d .106 .122 2.70 3.10 e .059 .071 1.50 1.80 e .037 bsc .95 bsc e1 .075 bsc 1.90 bsc h .087 .126 2.20 3.20 l .004 .024 .10 .60 0 10 0 10 e b d e1 e h a a1 l c notes: 1. package outline exclusive of mold ?sh & metal burr. 2. package outline exclusive of solder plating. 3. eiaj ref number sc_74a
product specification fan5307 life support policy fairchild? products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 6/22/04 0.0m 000 stock#ds30005307 ? 2004 fairchild semiconductor corporation disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. ordering information product number v out (v) package type order code fan5307 1.8 5-lead sot-23 tape and reel fan5307s18x 1.8 6-lead 3x3mm mlp tape and reel FAN5307MP18X adjustable 5-lead sot-23 tape and reel fan5307sx adjustable 6-lead 3x3mm mlp tape and reel fan5307mpx

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