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1 lt1316 micropower dc/dc converter with programmable peak current limit n precise control of peak switch current n quiescent current: 33 m a in active mode 3 m a in shutdown mode n low-battery detector active in shutdown n low switch v cesat : 300mv at 500ma n 8-lead msop and so packages n operates with v in as low as 1.5v n logic level shutdown pin features descriptio n u the lt ? 1316 is a micropower step-up dc/dc converter that operates from an input voltage as low as 1.5v. a programmable input current limiting function allows pre- cise control of peak switch current. peak switch current can be set to any value between 30ma and 500ma by adjusting one resistor. this is particularly useful for dc/dc converters operating from high source impedance inputs such as lithium coin cells or telephone lines. the fixed off-time, variable on-time regulation scheme results in quiescent current of only 33 m a in active mode. quiescent current decreases to 3 m a in shutdown with the low-battery detector still active. the lt1316 is available in 8-lead msop and so packages. , ltc and lt are registered trademarks of linear technology corporation. typical applicatio n u applicatio n s u n battery backup n lcd bias n low power C 48v to 5v/3.3v converters 2-cell to 5v step-up converter v in sw r set gnd fb shdn 65 8 1 4 3 2 7 lbo lbi lt1316 c2 47 m f nc nc r5 10k 1% c1 47 m f 2 cells l1 47 m h d1 5v 50ma d1: motorola mbr0520l l1: sumida cd43-470 1316 ta01 + + r1 1m 1% r2 324k 1% load current (ma) 0.1 60 efficiency (%) 80 90 1 10 100 1316 ta02 70 3.3v in 2.5v in 1.8v in efficiency vs load current
2 lt1316 absolute m axi m u m ratings w ww u v in voltage .............................................................. 12v sw voltage ............................................... C 0.4v to 30v fb voltage ..................................................... v in + 0.3v r set voltage ............................................................. 5v shdn voltage ............................................................ 6v lbi voltage ................................................................v in lbo voltage ............................................................. 12v maximum switch current ................................... 750ma maximum junction temperature ......................... 125 c operating temperature range commercial ............................................. 0 c to 70 c extended commercial (note 1) .......... C 40 c to 85 c industrial (note 2) .............................. C 40 c to 85 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c package/order i n for m atio n w u u lt1316cms8 order part number ms8 part marking ltcd order part number s8 part marking 1 2 3 4 8 7 6 5 top view lbo lbi r set gnd fb shdn v in sw s8 package 8-lead plastic so t jmax = 125 c, q ja = 120 c/w 1 2 3 4 lbo lbi r set gnd 8 7 6 5 fb shdn v in sw top view ms8 package 8-lead plastic msop t jmax = 125 c, q ja = 160 c/w consult factory for military grade parts. e lectr ic al c c hara terist ics commercial grade 0 c to 70 c, industrial grade C 40 c to 85 c, v in = 2v, v shdn = v in , t a = 25 c unless otherwise noted. (notes 1, 2) parameter conditions min typ max units minimum operating voltage 1.5 1.65 v maximum operating voltage 12 v quiescent current v shdn = 2v, not switching 33 45 m a l 50 m a quiescent current in shutdown v shdn = 0v, v in = 2v l 35 m a v shdn = 0v, v in = 5v l 710 m a fb pin bias current l 330 na line regulation v in = 1.8v to 12v l 0.04 0.15 %/v lbi input threshold falling edge l 1.1 1.17 1.25 v lbi pin bias current l 320 na lbi input hysteresis l 35 65 mv lbo output voltage low i sink = 500 m a l 0.2 0.4 v lbo output leakage current lbi = 1.7v, lbo = 5v l 0.01 0.1 m a shdn input voltage high l 1.4 v shdn input voltage low l 0.4 v shdn pin bias current v shdn = 5v l 2 5 m a v shdn = 0v l C1 C3 m a lt1316cs8 lt1316is8 1316 1316i
3 lt1316 e lectr ic al c c hara terist ics commercial grade 0 c to 70 c, industrial grade C 40 c to 85 c, v in = 2v, v shdn = v in , t a = 25 c unless otherwise noted. (notes 1, 2) load transient response burst mode tm operation v out 100mv/div ac coupled v out 100mv/div ac coupled v sw 5v/div inductor current 200ma/div 1316 g01 1316 g02 burst mode is a trademark of linear technology corporation. commercial grade 0 c to 70 c, v in = 2v, v shdn = v in , t a = 25 c unless otherwise noted. parameter conditions min typ max units switch off time fb > 1v 1.4 2.0 2.6 m s l 1.1 3.0 m s fb < 1v 3.4 m s switch on time current limit not asserted 4.4 6.3 8.2 m s 1v < fb < 1.2v l 3.4 9.5 m s maximum duty cycle current limit not asserted 74 76 90 % 1v < fb < 1.2v l 73 90 % switch saturation voltage i sw = 0.5a l 0.30 0.4 v i sw = 0.1a l 0.06 0.15 v switch leakage switch off, v sw = 5v l 0.1 5 m a fb comparator trip point l 1.21 1.23 1.25 v peak switch current r set = 27.4k, t a = 25 c 90 100 110 ma r set = 27.4k, t a =0 c 90 100 115 ma r set = 27.4k, t a = 70 c 70 90 110 ma r set = 10k l 250 290 340 ma r set = 121k 25 ma fb comparator trip point l 1.205 1.23 1.255 v peak switch current r set = 27.4k, l 70 100 125 ma r set = 10k l 200 290 370 ma industrial grade C 40 c to 85 c, v in = 2v, v shdn = v in , t a = 25 c unless otherwise noted. over the C 40 c to 85 c temperature range by design or correlation, but are not production tested. note 2: i grade device specifications are guaranteed over the C 40 c to 85 c temperature range. typical perfor m a n ce characteristics u w 0ma 50ma i load the l denotes specifications which apply over the specified temperature range. note 1: c grade device specifications are guaranteed over the 0 c to 70 c temperature range. in addition, c grade device specifications are assured
4 lt1316 typical perfor m a n ce characteristics u w switch current (ma) 0 switch saturation voltage (mv) 500 400 300 200 100 0 300 500 800 1316 g03 100 200 400 600 700 100 c ?0 c 75 c 25 c switch saturation voltage vs switch current temperature ( c) ?0 lbi pin current (na) 8 6 4 2 0 25 0 25 50 1316 g04 75 100 off-time vs temperature temperature ( c) ?0 off-time ( s) 4 3 2 1 0 25 0 25 50 1316 g05 75 100 temperature ( c) ?0 maximum on-time ( s) 8 7 6 5 25 0 25 50 1316 g06 75 100 maximum on-time vs temperature quiescent current vs temperature temperature ( c) ?0 quiescent current ( a) 36 34 32 30 28 26 25 0 25 50 1316 g07 75 100 feedback voltage vs temperature temperature ( c) ?0 feedback voltage (v) 1.240 1.235 1.230 1.225 1.220 25 0 25 50 1316 g08 75 100 lbi pin bias current vs temperature 10 peak switch current (ma) 100 1000 temperature ( c) 50 25 0 25 50 1316 g10 75 100 r set = 4.84k r set = 27.4k r set = 97.3k r set = 10k shutdown pin bias current vs shutdown pin voltage fb pin bias current vs temperature peak switch current vs temperature shutdown pin voltage (v) 0 shutdown pin current ( a) 4 3 2 1 0 ? 1234 1316 g09 56 temperature ( c) ?0 fb pin bias current (na) 4 3 2 1 25 0 25 50 1316 g11 75 100
5 lt1316 pi n fu n ctio n s uuu lbo (pin 1): low-battery detector output. open collector can sink up to 500 m a. low-battery detector remains active in shutdown mode. lbi (pin 2): low-battery detector input. when voltage at this pin drops below 1.17v, lbo goes low. r set (pin 3): a resistor between r set and gnd programs peak switch current. the resistor value should be between 3k and 150k. do not float or short to ground. this is a high impedance node. keep traces at this pin as short as possible. do not put capacitance at this pin. gnd (pin 4): ground. connect directly to ground plane. sw (pin 5): collector of npn power transistor. keep traces at this pin as short as possible. v in (pin 6): input supply. must be bypassed close to the pin. shdn (pin 7): shutdown. ground this pin to place the part in shutdown mode (only the low-battery detector remains active). tie to a voltage between 1.4v and 6v to enable the device. shdn pin is logic level and need only meet the logic specification (1.4v for high, 0.4v for low). fb (pin 8): feedback pin. reference voltage is 1.23v. connect resistive divider tap here. minimize trace area at fb. set v out according to: v out = 1.23v(1 + r1/r2). + + 1.17v a3 lbi a2 driver lb0 l1 r3 = 10r4 1.5v undervoltage lockout d1 c1 r5 r4 0.5v q2 1 r2 r1 v out v in q1 200 oscillator 6.3 m s on 2 m s off + + v ref 1.23v fb 2 3 4 7 8 5 6 1 a4 r set v in sw gnd 1316 f01 shdn a1 figure 1. lt1316 block diagram block diagra w
6 lt1316 applicatio n s i n for m atio n wu u u 10 m s/div 1316 f02 figure 2. switching waveforms r set (k w ) 10 dc current limit (ma) 100 1000 10 100 1316 f03 figure 3. dc current limit vs r set resistor note: dc current is the peak switch current if the power transistor had zero turn-off delay v out ac coupled 200mv/div v sw 5v/div inductor current 100ma/div during the portion of the switch cycle when q1 is turned off, current is forced through d1 to c1 causing output voltage to rise. this switching action continues until output voltage rises enough to overcome a1s hysteresis. peak switch current is set by a resistor from the r set pin to ground. voltage at the r set pin is forced to 0.5v by a4 and is used to set up a constant current through r5. this current also flows through r3 which sets the voltage at the positive input of comparator a2. when q1 turns on, the sw pin goes low and current ramps up at the rate v in /l. current through q2 is equal to q1s current divided by 200. when current through q2 causes the voltage drop across r4 and r3 to be equal, a2 changes state and resets the oscillator, causing q1 to turn off. shutdown is accom- plished by grounding the shdn pin. the low-battery detector a3 has its own 1.17v reference and is always on. the open collector output device can sink up to 500 m a. approximately 35mv of hysteresis is built into a3 to reduce buzzing as the battery voltage reaches the trip level. current limit during active mode when the part is switching, current in the inductor ramps up each switch cycle until reaching a preprogrammed current limit. this current limit value must be set by placing the appropriate resistor from the r set pin to ground. this resistance value can be found by using figure 3 to locate the desired dc current limit and table 1 simplifies component selection for commonly used input and output voltages. the methods used in determining these values are discussed in more detail later in this data sheet. v out can be set using the equation: v out = 1.23 r2 + r1 r2 ) ) r1 v out r2 1316 eqf01 fb table 1. r set resistor and inductor values load r set peak switch v in v out current resistor inductor current 2 5 10ma 36.8k 100 m h 80ma 2 5 25ma 18.2k 68 m h 165ma 2 5 50ma 10k 47 m h 320ma 2 5 75ma 6.81k 33 m h 500ma 5 12 100ma 6.81k 82 m h 490ma 5 28 1ma 75k 100 m h 56ma 5 28 5ma 22.1k 100 m h 140ma 5 28 10ma 10k 100 m h 270ma operation to understand operation of the lt1316, first examine figure 1. comparator a1 monitors fb voltage which is v out divided down by resistor divider network r1/r2. when voltage at the fb pin drops below the reference voltage (1.23v), a1s output goes high and the oscillator is enabled. the oscillator has an off-time fixed at 2 m s and an on-time limited to 6.3 m s. power transistor q1 is cycled on and off by the oscillator forcing current through the inductor to alternately ramp up and down (see figure 2).
7 lt1316 applicatio n s i n for m atio n wu u u then adding in the amount of overshoot that will occur due to turn-off delay of the power transistor. this turn-off delay is approximately 300ns. peak switch current = dc current limit from graph + v in /l(turn-off delay) example: set peak switch current to 100ma for: v in = 2v, l = 33 m h overshoot = v in /l(turn-off delay) = (2/33 m h)(300ns) = 18.2ma refer to r set graph and locate (100ma C 18.2ma) ? 82ma r set ? 33k calculating duty cycle for a boost converter running in continuous conduction mode, duty cycle is constrained by v in and v out according to the equation: dc = v out ?v in + v d v out ?v sat + v d where v d = diode voltage drop ? 0.4v and v sat = switch saturation voltage ? 0.2v. if the duty cycle exceeds the lt1316s minimum specified duty cycle of 0.73, the converter cannot operate in con- tinuous conduction mode and must be designed for discontinuous mode operation. inductor selection and peak current limit for continuous conduction mode peak current and inductance determine available output power. both must be chosen properly. if peak current or inductance is increased, output power increases. once output power or current and duty cycle are known, peak current can be set by the following equation, assuming continuous mode operation: i peak = 2(i out ) 1 ?dc (1) inductance can now be calculated using the peak current: l = (t off ) v out ?v in + v d 0.4(i peak ) (2) where t off = 2 m s and v d = 0.4v. as a result of equations 1 and 2, ripple current during switching will be 40% of the peak current (see figure 2). using these equations at the specified i out , the part is delivering approximately 60% of its maximum output power. in other words, the part is operating on a 40% reserve. this is a safe margin to use and can be decreased if input voltage and output current are tightly controlled. for some applications, this recommended inductor size may be too large. inductance can be reduced but available output power will decrease. also, ripple current during switching will increase and may cause discontinuous operation. discontinuous operation occurs when inductor current ramps down to zero at the end of each switch cycle (see figure 4). shown in figure 5 is minimum inductance vs peak current for the part to remain in continuous mode. figure 5. minimum inductance vs peak current for continuous mode operation peak current (ma) 10 10 minimum inductance for continous mode operation ( m h) 100 1000 100 1000 1316 f05 5v to 18v 5v to 12v 2v to 5v 2 m s/div figure 4. discontinuous mode operation 1316 f04 sw pin 5v/div 0ma inductor current 100ma/div
8 lt1316 applicatio n s i n for m atio n wu u u discontinuous mode operation a boost converter with a high v out :v in ratio operates with a high duty cycle in continuous mode. for duty cycles exceeding the lt1316s guaranteed minimum specifica- tion of 0.73, the circuit will need to be designed for discontinuous operation. additionally, very low peak cur- rent limiting below 50ma may necessitate operating in this mode unless high inductance values are acceptable. when operating in discontinuous mode, a different equation governs available output power. for each switch cycle, the inductor current ramps down to zero, completely releas- ing the stored energy. energy stored in the inductor at any time is equal to 1/2 li 2 . because this energy is released each cycle, the equation for maximum power out is: p out(max) = 1/2l(i peak 2 )f where f = + t off 1 i peak (l) v in ?v sat ) ) when designing for very low peak currents (< 50ma), the inductor size needs to be large enough so that on-time is a least 1 m s. on-time can be calculated by the equation: on-time = i peak ?l (v in ?v sat ) ) ) where v sat = 0.2v. also, at these low current levels, current overshoot due to power transistor turn-off delay will be a significant portion of peak current. increasing inductor size will keep this to a minimum. design example 1 requirements: v in = 2v, v out = 5v and i load = 10ma. 1. find duty cycle dc = v out ?v in + v d v out ?v sat + v d ) ) = = 0.654 5 ?2 + 0.4 5 ?0.2 + 0.4 ) ) because duty cycle is less than the lt1316 minimum specification (0.73), the circuit can be designed for continuous operation. 2. i peak = 2(i out ) 1 ?dc = = 58ma 2(10ma) 1 ?0.654 3. find l l = v out ?v in + v d 0.4(i peak ) ) ) = = 293 m h 5 ?2 + 0.4 0.4(58ma) ) ) t off 2 m s 4. find r set resistor overshoot = 300ns v in l ) ) = = 1.8ma 2 330 m h ) ) find r set from figure 3 for 58ma C 1.8ma = 56.2ma r set ? 47k design example 2 requirements: v in = 3.3v, v out = 28v and i load = 5ma. 1. find duty cycle: dc = v out ?v in + v d v out ?v sat + v d ) ) = = 0.89 28 ?3.3 + 0.4 28 ?0.2 + 0.4 ) ) because duty cycle exceeds lt1316 minimum specifi- cation of 73%, the circuit must be designed for discon- tinuous operation. 2. find p out(max) multiply p out by 1.4 to give a safe operating margin p out(max) = p out (1.4) = (5ma)(28v)(1.4) = 0.196w 3. set the on-time to the data sheet minimum of 3.4 m s and find l l = (t on 2 )(v in ?v sat ) 2 2p out(max) (t on + t off ) = = 52 m h (3.4 m s 2 )(3.3 ?0.2) 2 2(0.196w)(3.4 m s + 2 m s)
9 lt1316 applicatio n s i n for m atio n wu u u 4. find i peak for 3.4 m s on-time i peak = = 0.202a t on (v in ?v sat ) l = 3.4 m s(3.3 ?0.2) 52 m h 5. find r set resistor overshoot = 300ns v in l ) ) = 300ns = 19ma 3.3 52 m h ) ) find r set from figure 3 for 0.202a C 19ma = 0.183a r set ? 13k these discontinuous mode equations are designed to minimize peak current at the expense of inductor size. if smaller inductors are desired peak current must be increased. capacitor selection low esr (equivalent series resistance) capacitors should be used at the output of the lt1316 to minimize output ripple voltage. high quality input bypassing is also required. for surface mount applications avx tps series tantalum capacitors are recommended. these have been specifically designed for switch mode power supplies and have low esr along with high surge current ratings. for through-hole applications sanyo os-con capacitors offer extremely low esr in a small package size. if peak switch current is reduced using the r set pin, capacitor requirements can be eased and smaller, higher esr units can be used. ordinary generic capacitors can generally be used when peak switch current is less than 100ma, although output voltage ripple may increase. diodes most of the application circuits on this data sheet specify the motorola mbr0520l surface mount schottky diode. this 0.5a, low drop diode suits the lt1316 well. in lower current applications, a 1n4148 can be used although efficiency will suffer due to the higher forward drop. this effect is particularly noticeable at low output voltages. for higher output voltage applications, such as lcd bias generators, the extra drop is a small percentage of the output voltage so the efficiency penalty is small. the low cost of the 1n4148 makes it attractive wherever it can be used. in through-hole applications the 1n5818 is the all around best choice. lowering output ripple voltage to obtain lower output ripple voltage, a small feedforward capacitor of about 50pf to 100pf may be placed from v out to fb as detailed in figure 6. ripple voltages with and without the added capacitor are pictured in figures 7 and 8. v in sw r set gnd fb shdn lt1316 47 m f 10k r1 1m 1% c1 100pf r2 324k 1% 47 m f 2 cells l1 47 m h d1 v out 1316 f06 + + shutdown figure 6. 2-cell to 5v step-up converter with reduced output ripple voltage
10 lt1316 applicatio n s i n for m atio n wu u u v out 100mv/div ac coupled i l 100ma/div 100 m s/div 1316 f07 figure 7. switching waveforms for the circuit shown in figure 7 without c1. the output ripple voltage is approximately 140mv p-p 50 m s/div 1316 f08 figure 8. by adding c1, output ripple voltage is reduced to less than 80mv p-p i l 100ma/div v out 100mv/div ac coupled 1 m f ceramic capacitor acts to smooth voltage spikes at switch turn-on and turn-off. if the power source is far away from the ic, inductance in the power source leads results in high impedance at high frequency. a local high capaci- tance bypass is then required to restore low impedance at the ic. low-battery detector the lt1316 contains an independent low-battery detector that remains active when the device is shut down. this detector, actually a hysteretic comparator, has an open collector output that can sink up to 500 m a. the compara- tor also operates below the switchers undervoltage lock- out threshold, operating until v in reaches approximately 1.4v. layout/input bypassing the lt1316s high speed switching mandates careful attention to pc board layout. suggested component place- ment is shown in figure 9. the input supply must have low impedance at ac and the input capacitor should be placed as indicated in the figure. the value of this capacitor depends on how close the input supply is to the ic. in situations where the input supply is more than a few inches away from the ic, a 47 m f to 100 m f solid tantalum bypass capacitor is required. if the input supply is close to the ic, a 1 m f ceramic capacitor can be used instead. the lt1316 switches current in pulses up to 0.5a, so a low impedance supply must be available. if the power source (for example, a 2 aa cell battery) is within 1 or 2 inches of the ic, the battery itself provides bulk capacitance and the 1316 f09 8 7 6 5 4 3 2 1 lt1316 c out r set v in gnd v out l d c in + + figure 9. suggested pc layout
11 lt1316 typical applicatio n s n u efficiency vs load current load current (ma) 1 40 efficiency (%) 50 60 70 80 10 100 1316 ta04 90 36v in 72v in 48v in + + lt1316 lbi lb0 fb shdn 7 1 2 r3 604k 1% q3 2n3904 ?48v r2 1.30m 1% r5 69.8k 1% r6 121k 1% r7 432k, 1% q2 mpsa92 8 34 6 r4 2m r1 1.3m c1 0.1 m f c2 0.022 m f c4 47 m f d2 1n4148 c3 47 m f d1 1n5817 t1 10:1:1 l3 2 1 6 7 4 3 l1 v out 5v 50ma 5 q1 d3 1n4148 v in sw r set gnd t1 = dale lpe-4841-a313 (605-665-9301) l pri : 2mh r ds(on) : 4.3 at v gs = 2.5v r6, q2,r7 must be placed next to the fb pin i in = 190 a when v in = 48v, i load = 1ma l2 v a 1316 ?ta03 nonisolated C 48v to 5v flyback converter
12 lt1316 typical applicatio n s n u positive-to-negative converter for lcd bias v in v in sw r set fb 7 65 d1 mmbd914 8 4 3 shdn lt1316 gnd c4 1 m f 35v r3 15k c1 33 m f 10v 2 cells l1 33 m h c4: sprague 293d105x9035b2t c5: sprague 293d225x0035b2t l1: sumida cd43-330 1316 ta06 shutdown + c5 2.2 f 35v + + r1 3.3m 2.2m c2 0.01 f 50v r2 210k contrast adjust d3 mbr0530l v out 20v 6ma c3 100pf 50v c6 0.33 f 50v d2 mmbd914 battery-powered solenoid driver cap good 5v/div v energize 5v/div i l1 200ma/div v cap 10v/div 1316 ta09 500ms/div when solenoid is energized (v energize high) peak input current remains low and controlled, maximizing battery life v in v in sw r set fb 7 2 65 bat-85 v cap ztx949 v energize 8 1 4 3 shdn lbi lbo lt1316 gnd 20k 470k c1 47 m f 16v 2 cells l1 47 m h c1: avx tps 47 f, 16v c2: sanyo 50mv470gx l1: sumida cd43-470 1316 ta08 shutdown cap good + + 5k 1.3k 2n3904 6.8m 324k 47k solenoid 1n4148 c2 470 f 50v 50k
13 lt1316 typical applicatio n s n u super cap backup supply 50v to 6v isolated flyback converter l1 47 m h d1 0.5a 1316 ta10 run r set 33k connect to main supply 5v 6ma ready 1.00m 100pf 1m r1 10k c in 33 m f 10v 1.00m 357k 324k + + c out 33 m f 10v tajb330m010r panasonic eec-s5r5v104 c in , c out : c sup : + c sup 0.1f 5.5v 75 w mbr0520lt3 sumida cd43-470 d1: l1: v in sw lt1316 shdn lbi lbo fb 7 2 1 65 8 4 3 r set gnd + lt1316 lbi lb0 fb shdn 7 1 2 604k 1% 2n3904 1.30m 1% 69.8k 1% 12.7k 50k 8 34 6 2m 510k +v in 25v to 50v 0.1 m f 0.022 m f 100v ceramic 1 m f 16v ceramic 1n4148 c1 100 f 16v 1n5817 t1 l pri : 2mh 10:1:1 2 1 4 3 7 6 v out 6v/20ma 75% efficiency 5 q1 1n4148 v in sw r set gnd c1 = sanyo os-con 100 f, 16v q1 = zetex zvn 4424a t1 = dale lpe-4841-a313 (605-665-9301) 1316 ta11 +
14 lt1316 typical applicatio n s n u lcd bias generator with output disconnect in shutdown v in v in 3.3v sw r set 7 8 65 mbr0540lt1 optional connection v bat 1.6v to 3.5v v adj (v out adjust) 0v to 3.3v 4 3 shdn fb lt1316 gnd 11k 1% l1 22 h c1 22 m f 6.3v c1: avx taja226m006r c2: avx tajb335m035r l1: murata lqh3c220k04 q1: mmbt3906lt3 1316 ta12 shutdown + + 4.7m 150k 100pf 50v ceramic v out 17.1v to 19.8v 4ma 3.32m 1% 232k 1% c2 3.3 f 35v 0.33 f 50v ceramic q1 universal serial bus (usb) to 5v/100ma dc/dc converter v in v in 4v to 7v sw r set 3 8 65 d1 7 4 shdn fb lt1316 gnd r3 10k r b 100 l1 33 h c1 10 m f 10v c1: 10 f 10v avx tajb106m010 c2: 33 f 10v avx tpsc336m010 c3: 10 f aluminum electrolytic d1: mbr0520lt1 l1: 33 h sumida cd43 (or coilcraft do1608) q1: mps1907a 1316 ta13 + + r2 1.00m r1 324k 100pf v out 5v 100ma c2 33 f 10v + c3 10 f 10v q1
15 lt1316 package descriptio n u dimensions in inches (millimeter) unless otherwise noted. 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 0996 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) typ dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * ** ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) msop (ms8) 1197 * dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.006" (0.152mm) per side 0.021 0.006 (0.53 0.015) 0 ?6 typ seating plane 0.007 (0.18) 0.040 0.006 (1.02 0.15) 0.012 (0.30) ref 0.006 0.004 (0.15 0.102) 0.034 0.004 (0.86 0.102) 0.0256 (0.65) typ 12 3 4 0.192 0.004 (4.88 0.10) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102) s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
16 lt1316 1316f lt/tp 0298 4k ? printed in usa ? linear technology corporation 1997 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 l (408) 432-1900 fax: (408) 434-0507 l telex: 499-3977 l www.linear-tech.com typical applicatio n s n u low profile 2 cell-to-28v converter for lcd bias v in sw r set fb 7 1 2 65 d1 8 4 3 shdn lbi lbo lt1316 gnd c2 1 m f 35v 10k c1 10 m f 2 cells v in l1 22 m h v out 28v 5ma c1: murata grm235y5v106z010 c2: sprague 293d105x9035b2t c3: 0.33 f ceramic, 50v c4: 100pf ceramic, 50v d1: bat-54 l1: murata lqh3c220k04 1316 ta05 shutdown + 4.32m c4 100pf 50v 204k c3 0.33 f 50v bipolar lcd bias supply v in v in 3.3v to 4.2v sw r set 8 65 1n914 7 4 shdn fb lt1316 gnd 3 47k l1 47 h c1 22 m f 16v c4 3.3 m f 35v 1316 ta14 + + 1.00m 88.7k (bat54 = two diodes in sot23) bat54 2 100pf 13v 0.5ma 15v 1.5ma c3 1 f 35v c2 1 f 35v + + 2n3904 22k 10k c1: avx tajb226m016r c2, c3: avx taja105k035r c4: avx tajb335m035r l1: murata lqh3c470 part number description comments ltc ? 1163 triple high side driver for 2-cell inputs 1.8v minimum input, drives n-channel mosfets ltc1174 micropower step-down dc/dc converter 94% efficiency, 130 m a i q , 9v to 5v at 300ma lt1302 high output current micropower dc/dc converter 5v/600ma from 2v, 2a internal switch, 200 m a i q lt1304 2-cell micropower dc/dc converter low-battery detector active in shutdown, 5v at 200ma for 2 cells lt1307 single cell micropower 600khz pwm dc/dc converter 3.3v at 75ma from 1 cell ltc1440/1/2 ultralow power single/dual comparators with reference 2.8 m a i q , adjustable hysteresis ltc1516 2-cell to 5v regulated charge pump 12 m a i q , no inductors, 5v at 50ma from 3v input lt1521 micropower low dropout linear regulator 500mv dropout, 300ma current, 12 m a i q related parts

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