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1 ltc1503-1.8/ltc1503-2 high efficiency inductorless step-down dc/dc converters n input voltage range: 2.4v to 6v n fixed output voltages: 1.8v 4%, 2v 4% n output current: up to 100ma n no inductors n typical efficiency 25% higher than ldos n low operating current: 25 m a n low shutdown current: 5 m a n 600khz switching frequency n shutdown disconnects load from v in n soft-start limits inrush current at turn-on n short-circuit and overtemperature protected n available in 8-pin msop and so packages the ltc ? 1503-1.8/ltc1503-2 are switched capacitor step-down dc/dc converters that produce a regulated output from a 2.4v to 6v input. the parts use switched capacitor fractional conversion to achieve high efficiency over the entire input range. no inductors are required. internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load condi- tions vary. typical efficiency is 25% higher than that of a low dropout (ldo) linear regulator. regulation is achieved by sensing the output voltage and enabling the internal switching network as needed to maintain a fixed output voltage. this method of regulation enables the parts to achieve high efficiency at extremely light loads. low operating current (25 m a with no load, 5 m a in shutdown) and low external parts count (two 1 m f flying capacitors and two 10 m f bypass capacitors) make the ltc1503-1.8/ltc1503-2 ideally suited for space con- strained battery-powered applications. the parts are fully short-circuit and overtemperature protected. the ltc1503-1.8/ ltc1503-2 are available in 8-pin msop and so packages. , ltc and lt are registered trademarks of linear technology corporation. n cellular phones n handheld computers n smart card readers n low power dsp supplies n portable electronic equipment n handheld medical instruments efficiency vs input voltage single li-ion to 2v dc/dc converter features descriptio u applicatio s u typical applicatio u 4 2 3 5 1 8 6 7 v in c1 c1 + shdn/ss v out c2 c2 + gnd ltc1503-2 1 m f 1503-1.8/2 ta01 1 m f 10 m f 1-cell li-ion or 3-cell nimh 10 m f v out = 2v i out = 100ma input voltage (v) 2 efficiency (%) 60 80 6 1503-1.8/2 ta02 40 20 3 4 5 100 ltc1503-2 v out = 2v i out = 100ma i out = 1ma ?deal?ldo
2 ltc1503-1.8/ltc1503-2 industrial temperature range ............... C 40 c to 85 c specified temperature range (note 2) ... C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c (note 1) parameter conditions min typ max units v in operating voltage l 2.4 6 v v out ltc1503-1.8, 0ma < i out < 100ma l 1.728 1.8 1.872 v ltc1503-2, 0ma < i out < 100ma l 1.920 2.0 2.080 v v in operating current i out = 0ma l 25 50 m a v in shutdown current shdn/ss = 0v l 510 m a output ripple voltage ltc1503-x, v in = 3.6v, i out = 100ma 25 mv p-p efficiency ltc1503-2, v in = 3.6v, i out = 100ma 82.9 % switching frequency oscillator free running 600 khz shdn/ss input threshold l 0.2 0.35 0.5 v shdn/ss input current v shdn/ss = 0v (note 3) l C3.5 C2 C1 m a v shdn/ss = v in l C1 1 m a v out short-circuit current v out = 0v (note 4) l 82250 ma v out turn-on time c ss = 0nf, v in = 3.6v, c out = 10 m f 0.1 ms c ss = 10nf 8 ms note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the ltc1503c is guaranteed to meet specified performance from 0 c to 70 c and is designed, characterized and expected to meet these extended temperature limits, but are not tested at C 40 c and 85 c. the ltc1503i is guaranteed to meet the extended temperature limits. note 3: currents flowing into the device are positive polarity. currents flowing out of the device are negative polarity. note 4: when v out is less than 150mv, i out is limited to much less than the maximum rated output current to prevent damage to the output devices. order part number ltc1503cms8-1.8 ltc1503cms8-2 ms8 part marking LTFX lthn order part number ltc1503cs8-1.8 ltc1503cs8-2 ltc1503is8-1.8 ltc1503is8-2 s8 part marking 150318 15032 consult factory for military grade parts. t jmax = 125 c, q ja = 200 c/w 1 2 3 4 v out c1 c1 + v in 8 7 6 5 c2 gnd c2 + shdn/ss top view ms8 package 8-lead plastic msop t jmax = 125 c, q ja = 150 c/w 1 2 3 4 8 7 6 5 top view s8 package 8-lead plastic so v out c1 c1 + v in c2 gnd c2 + shdn/ss v in , c1 + , c1 , c2 + , c2 to gnd ............... 0.3v to 6.5v shdn/ss to gnd ......................... 0.3v to (v in + 0.3v) v out short-circuit duration ............................. indefinite commercial temperature range ............ 40 c to 85 c the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v in = v in(min) to v in(max) , c1 = c2 = 1 m f, c in = c out = 10 m f unless otherwise noted. 503i18 1503i2 absolute axi u rati gs w ww u package/order i for atio uu w electrical characteristics
3 ltc1503-1.8/ltc1503-2 ltc1503-x input operating current vs input voltage input voltage (v) 2 input current ( a) 30 t a = 25 c 40 6 1503 g01 20 10 3 4 5 50 i out = 0ma t a = 40 c t a = 85 c ltc1503-1.8 output voltage vs input voltage ltc1503-2 output voltage vs input voltage ltc1503-1.8 efficiency vs input voltage input voltage (v) 2 output voltage (v) 2.00 2.05 6 1503 g03 1.95 1.90 3 4 5 2.10 i out = 50ma t a = 40 c t a = 85 c t a = 25 c input voltage (v) 2 efficiency (%) 60 80 6 1503-1.8/2 g05 40 20 3 4 5 100 ?deal ldo t a = 25 c i out = 100ma i out = 1ma ltc1503-1.8 efficiency vs output current ltc1503-x input shutdown current vs input voltage input voltage (v) 2 input shutdown current ( a) 5 7.5 6 1503-1.8/2 ta02 2.5 0 3 4 5 10 v out = 0v v shdn /ss = 0v t a = 40 c t a = 85 c t a = 25 c input voltage (v) 2 output voltage (v) 1.80 1.85 6 1503-1.8/2 g03 1.75 1.70 3 4 5 1.90 i out = 50ma t a = 40 c t a = 85 c t a = 25 c output current (ma) 0.01 efficiency (%) 60 80 100 100 1503-1.8/2 g06 40 20 0 0.1 1 10 1000 v in = 5v v in = 4.4v v in = 3.6v v in = 3v v in = 2.4v t a = 25 c ltc1503-2 efficiency vs output current output current (ma) 0.01 efficiency (%) 60 80 100 100 1503-1.8/2 g07 40 20 0 0.1 1 10 1000 v in = 5v v in = 4.4v v in = 3.6v v in = 3v v in = 2.4v t a = 25 c ltc1503-1.8 output voltage vs output current output current (ma) 0.01 output voltage (v) 1.80 1.82 1.84 100 1503-1.8/2 g08 1.78 1.76 1.74 0.1 1 10 1000 v in = 3.3v t a = 40 c t a = 85 c t a = 25 c ltc1503-2 output voltage vs output current output current (ma) 0.01 output voltage (v) 2.00 2.02 2.04 100 1503-1.8/2 g09 1.98 1.96 1.94 0.1 1 10 1000 v in = 3.3v t a = 40 c t a = 85 c t a = 25 c typical perfor a ce characteristics uw
4 ltc1503-1.8/ltc1503-2 typical perfor a ce characteristics uw ltc1503-x output short-circuit current vs input voltage ltc1503-x start-up time vs soft-start capacitor input voltage (v) 2 output current (ma) 20 30 6 1503-1.8/2 g10 10 0 3 4 5 40 v out shorted to gnd t a = 40 c t a = 85 c t a = 25 c soft-start capacitor (nf) 0.01 start-up time (ms) 1 10 100 1503-1.8/2 g10 0.1 0.01 0.1 1 10 100 v in = 3.6v t a = 40 c t a = 25 c t a = 85 c output load transient response (ltc1503-1.8,1ma to 100ma step) i out 50ma/div v out 50mv/div ac coupled 100ma 1ma 1ms/div 1503-1.8/2 g12 output ripple, c out = 10 m f v out 10mv/div ac coupled 5 m s/div 1503-1.8/2 g13 v in = 3.6v v out = 2v i out = 100ma c out = 10 m f ceramic output ripple, c out = 22 m f v out 10mv/div ac coupled 5 m s/div 1503-1.8/2 g14 v in = 3.6v v out = 2v i out = 100ma c out = 22 m f ceramic v out (pin 1): regulated output voltage. v out is discon- nected from v in during shutdown. bypass v out to ground with a 3 10 m f low esr capacitor. c1 C (pin 2): flying capacitor one negative terminal. c1 + (pin 3): flying capacitor one positive terminal. v in (pin 4): input voltage. v in may be between 2.4v and 6v. bypass v in to ground with a 3 10 m f low esr capacitor. shdn/ss (pin 5): shutdown/soft-start control. the pin is designed to be driven with an external open-drain output. holding the shdn/ss pin below 0.25v will force the part into shutdown mode. an internal pull-up current of 2 m a will force the shdn/ss voltage to climb to v in once the device driving the pin is forced into a hi-z state. to limit inrush current on start-up, connect a capacitor between the shdn/ss pin and ground. capacitance on the shdn/ss pin will limit the dv/dt of the pin during turn- on which, in turn, will limit the dv/dt of v out . by selecting an appropriate soft-start capacitor for a known output capacitor, the user can control the inrush current during uu u pi fu ctio s
5 ltc1503-1.8/ltc1503-2 c1 + v in c1 c2 + c2 150mv 800k 680k 330k 990k 1.2m 1.2v v ref c out c in v out gnd 1503-1.8/2 bd shdn/ss + + + + 350mv + + 10mv comp2 mode skip reg enable soft-start ltc1503-2 short circuit v out + comp1 350mv v in shdn 2 m a + v ref ramp + + step-down charge pump mode control 600khz oscillator + turn-on (see applications information). if neither of the two functions are desired, the pin may be floated or tied to v in . c2 + (pin 6): flying capacitor two positive terminal. gnd (pin 7): ground. connect to a ground plane for best performance. c2 C (pin 8): flying capacitor two negative terminal. uu u pi fu ctio s block diagra w
6 ltc1503-1.8/ltc1503-2 general operation the two most common methods for providing regulated step-down dc/dc conversion are linear dc/dc conversion (used by ldos) and inductor-based dc/dc conversion. linear regulation provides low cost and low complexity, but the conversion efficiency is poor since all of the load cur- rent must come directly from v in . inductor-based step- down conversion provides the highest efficiency, but the solution cost and circuit complexity are much higher. the ltc1503-x provides the efficiency advantages associated with inductor-based circuits as well as the cost and sim- plicity advantages of an inductorless converter. the ltc1503-x is a switched capacitor step-down dc/dc converter. the part uses an internal switch network and fractional conversion ratios to achieve high efficiency over widely varying v in and output load conditions. internal control circuitry selects the appropriate step-down con- version ratio based on v in , v out and load conditions to optimize efficiency. the part has three possible step-down modes: 2-to-1, 3-to-2 or 1-to-1 (gated switch) step-down mode. only two external flying caps are needed to operate in all three modes. 2-to-1 mode is chosen when v in is greater than two times the desired v out . 3-to-2 mode is chosen when v in is greater than 1.5 times v out but less than 2 times v out . 1-to-1 mode is chosen when v in falls below 1.5 times v out . an internal mode skip function will switch the step-down ratio as needed to maintain output regulation under heavy load conditions. regulation is achieved by sensing the divided down output voltage and enabling the charge pump as needed to boost the output back into regulation. this method of regulation allows the ltc1503-x to achieve high efficiency at very light loads. the part has shutdown capability as well as user controlled inrush current limiting. in addition, the part can withstand an indefinite short-circuit condition on v out and is also overtemperature protected. step-down charge pump operation figure 1a shows the charge pump switch configuration that is used for 2-to-1 step down. when the charge pump is enabled in this mode, a two phase nonoverlapping clock generates the switch control signals. on phase one of the clock, flying capacitor c1 is connected through switches figure 1a. step-down charge pump in 2-to-1 mode s1 and s2 across v out . if the voltage on c1 is greater than the voltage on c out , charge is transferred from c1 onto c out . on phase two, the top plate of c1 is connected to v in and the bottom plate is connected to v out . if the voltage across c1 is less than v in /2 during phase two, charge will be transferred from c1 onto c out thereby boosting the voltage on c out and raising the voltage across c1. thus, in 2-to-1 mode, charge transfer from c1 onto c out occurs on both phases of the clock, and the voltage on c out is driven towards 1/2v in until the output is back in regula- tion. since charge current is sourced from ground on phase one of the clock, current multiplication is realized with respect to v in , i.e., i vout equals approximately 2 ? i vin . this results in significant efficiency improvement relative to a linear regulator. the 3-to-2 conversion mode also uses a nonoverlapping clock for switch control but requires two flying capacitors and a total of seven switches (see figure 1b). on phase one, c1 and c2 are connected in series across v out . if the sum of the voltages across c1 and c2 is greater than v out , charge is transferred from the flying caps onto c out thereby reducing the average voltage on the flying caps and raising the voltage on the output capacitor. on phase two, the two flying capacitors are connected on parallel between v in and v out . since the average voltage across the two capacitors during phase one is v out /2, charge will be transferred from v in to v out through the two flying caps if v in minus v out /2 is greater than v out . in this manner, charge is again transferred from the flying caps to the output on both phases of the clock, and the voltage on c out is driven towards (2/3)v in until the part is back in regulation. as in 2-to-1 mode, charge current is sourced from ground on phase one of the clock which results in increased power efficiency. i vout in 3-to-2 mode equals approximately (3/2)i vin . s4 f 2 s1 f 1 s3 f 2 s2 f 1 c1 (external) c1 + c1 1503-1.8/2 f01a v in v out applicatio s i for atio wu uu
7 ltc1503-1.8/ltc1503-2 maintain regulation. this will only occur as v in /v out nears a 3-to-2 or 1-to-1 transition point. for example, under light load conditions, the ltc1503-x can operate in 2-to-1 mode when v in equals 4.1v with greater than 90% effi- ciency. however, when the load is increased, the part can no longer supply enough output current in 2-to-1 mode to maintain regulation. this causes v out to droop below the regulation point until comp2 trips and forces the part to skip from 2-to-1 mode to 3-to-2 mode. the comp2 threshold is about 17mv (v out referred) below the main comparator regulation point. hysteresis in comp2 will force the part to transition in and out of mode skipping. this will result in a slight v out decrease of approximately 20mv under mode skipping conditions. shutdown/soft-start operation the shdn/ss pin is used to implement both low current shutdown and soft-start. the soft-start feature limits inrush currents when the regulator is initially powered up or taken out of shutdown. forcing a voltage lower than 0.35v (typ) will put the part into shutdown mode. shut- down mode disables all control circuitry and forces the charge pump v out into a high impedance state. a 2 m a pull- up current on the shdn/ss pin will force the part into active mode if the pin is left floating or is driven with an open-drain output that is in a high impedance state. if the pin is not driven with an open-drain device, it must be forced to a logic high voltage of 2.2v (min) to ensure proper v out regulation. the shdn/ss pin should not be driven to a voltage higher than v in . to implement soft-start, the shdn/ss pin must be driven with an open-drain device and a capacitor must be connected from the shdn/ss pin to gnd. once the open- drain device is turned off, a 2 m a pull-up current will begin charging the external ss capacitor and force the voltage on the pin to ramp towards v in . as soon as the shdn threshold is reached (0.35v typ), the internal reference voltage which controls the v out regulation point will follow the ramp voltage on the shdn/ss pin (minus a 0.35v offset to account for the shdn threshold) until the reference reaches its final band gap voltage. this occurs when the voltage on the shdn/ss pin reaches figure 1b. step-down charge pump in 3-to-2 mode in 1-to-1 mode, switch s1 and s2 are connected in series between v in and v out as needed to boost v out back into regulation (see figure 1c). the reg enable signal from the main comparator (comp1) controls switches s1 and s2 directly. since all of the v out current is sourced from v in , the efficiency in 1-to-1 mode is approximately equal to that of a linear regulator. figure 1c. step-down charge pump in 1-to-1 mode mode selection and mode skipping the optimal step-down conversion mode is chosen based on v in to v out differential voltage and output load condi- tions. two internal comparators are used to select the default step-down mode based on the v in and v out voltage. a separate comparator (comp2) is used to sense a droop on v out due to a heavy output load and force the charge pump to skip to a higher output current mode to s1 f 1 s5 f 2 s7 f 2 s4 f 2 s2 f 1 c1 (external) c2 (external) c1 + c1 c2 gnd c2 + 1503-1.8/2 f01b v in v out s3 f 1 s6 f 2 s2 s1 c1 (external) c1 + c1 1503-1.8/2 f01c v in v out applicatio s i for atio wu uu
8 ltc1503-1.8/ltc1503-2 2ms/div 1503-1.8/2 f02b ltc1503-2 c ss = 0nf c out = 10 m f r load = 50 w capacitor selection for best performance, it is recommended that low esr capacitors be used for c in and c out to reduce noise and ripple. if the esr of the output capacitor is too high (> 0.5 w ), both efficiency and output load regulation may be degraded. the c in and c out capacitors should be either ceramic or tantalum and should be 10 m f or greater. if the input source impedance is very low (< 0.5 w ), c in may not be needed. ceramic capacitors are recommended for the flying caps c1 and c2 with values of 0.47 m f to 2.2 m f. smaller values may be used in low output current applica- tions (e.g., i out < 10ma). for best performance choose the same capacitance value for both c1 and c2. output ripple normal ltc1503-x operation produces voltage ripple on the v out pin. output voltage ripple is required for the parts to regulate. low frequency ripple exists due to the hyster- esis in the sense comparator and propagation delays in the charge pump enable/disable circuits. high frequency ripple is also present mainly from the esr (equivalent series resistance) in the output capacitor. typical output ripple (v in = 3.6v) under maximum load is 25mv peak-to-peak with a low esr 10 m f output capacitor. the magnitude of ripple voltage depends on several fac- tors. high input voltages increase the output ripple since more charge is delivered to c out per charging cycle. large output current load and/or a small output capacitor (< 10 m f) results in higher ripple due to higher output voltage dv/dt. high esr capacitors (esr > 0.5 w ) on the output pin cause high frequency voltage spikes on v out with every clock cycle. there are several ways to reduce the output voltage ripple (see figure 3). a larger c out capacitor (22 m f or greater) will reduce both the low and high frequency ripple due to the lower c out charging and discharging dv/dt and the lower esr typically found with higher value (larger case size) capacitors. a low esr ceramic output capacitor will minimize the high frequency ripple, but will not reduce the low frequency ripple unless a high capacitance value is chosen. a reasonable compromise is to use a 10 m f to 22 m f tantalum capacitor in parallel with a 1 m f to 3.3 m f ceramic approximately 1.9v. since the ramp rate on the shdn/ss pin controls the ramp rate on v out , the average inrush current can be controlled through selection of c ss and c out . for example, a 4.7nf capacitor on shdn/ss results in a 4ms ramp time from 0.35v to 1.9v on the pin. if c out is 10 m f, the 4ms v ref ramp time results in an average c out charge current of only 5ma (see figure 2c). 5 1 r load c ss 1503-1.8/2 f02a v ctrl on off shdn/ss v out ltc1503-x (a) v ctrl 2v/div v out 1v/div (b) 2ms/div 1503-1.8/2 f02b ltc1503-2 c ss = 4.7nf c out = 10 m f r load = 50 w v ctrl 2v/div v out 1v/div (c) figure 2. shutdown/soft-start operation applicatio s i for atio wu uu
9 ltc1503-1.8/ltc1503-2 figure 3. output ripple reduction techniques + v out ltc1503-x ltc1503-x v out 10 m f tantalum 0.5 w 1 m f ceramic + v out v out 1503-1.8/2 f03 10 m f tantalum + 10 m f tantalum capacitor on v out to reduce both the low and high fre- quency ripple. an rc filter may also be used to reduce high frequency voltage spikes. protection features the ltc1503-x contains both thermal shutdown and short-circuit protection features. the charge pump will shut down when the junction temperature reaches ap- proximately 150 c and will resume operation once the junction temperature has dropped back to 125 c. the part will limit output current to 20ma (typ) when a short-circuit condition (v out < 150mv) exists to prevent damage to the internal switches. during start-up, the 20ma current limit is disabled once v out reaches 0.7v (typ). the part can survive an indefinite short from v out to gnd. layout considerations for best regulation and noise performance, careful board layout is required. improper bypassing and grounding may lead to poor load regulation and output ripple perfor- mance. all capacitors, especially c in and c out , must be as close as possible to the v in and v out pins. connecting the gnd pin and all bypass capacitors to an uninterrupted ground plane is also advised. see figure 4 for recom- mended component placement and grounding. c2 ltc1503-x gnd c1 v in c in c out 1503-1.8/2 f04 shdn/ss v out figure 4. recommended component placement and grounding applicatio s i for atio wu uu
10 ltc1503-1.8/ltc1503-2 dimensions in inches (millimeters) unless otherwise noted. ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) msop (ms8) 1098 * 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) bsc 12 3 4 0.193 0.006 (4.90 0.15) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102) u package descriptio
11 ltc1503-1.8/ltc1503-2 s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) dimensions in inches (millimeters) unless otherwise noted. 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 1298 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) typ 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc 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) 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 * ** 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 its circuits as described herein will not infringe on existing patent rights. u package descriptio
12 ltc1503-1.8/ltc1503-2 ? linear technology corporation 1999 150312f lt/tp 0200 4k ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com part number description comments ltc1474/ltc1475 low quiescent current step-down dc/dc converter i out to 250ma, i q = 10 m a; 8-lead msop ltc1502-3.3 single cell to 3.3v quadrupler charge pump v in = 0.9v to 1.8v, i out = 10ma; i q = 40 m a ltc1514/ltc1515 micropower, regulated 5v step-up/step-down 2v to 10v input range; up to 50ma output current: short-circuit charge pump dc/dc converters and overtemperature protected ltc1555/ltc1556 sim power supply and level translator step-up/step-down charge pump generates 5v or 3v ltc1627 monolithic synchronous buck step-down 2.65v to 8.5v input range; v out from 0.8v, i out to 500ma; switching regulator low dropout operation; 100% duty cycle ltc1754-3.3 3.3v charge pump with shutdown in sot-23 50ma output current, i cc = 13 m a ltc1754-5 5v charge pump with shutdown in sot-23 50ma output current, i cc = 13 m a related parts dc/dc converter with shutdown and soft-start 4 2 3 5 1 8 6 7 ltc1503-1.8 1 m f 10nf 2n7002 on off 1503-1.8/2 ta03 1 m f 10 m f 1-cell li-ion or 3-cell nimh 10 m f v out = 1.8v i out = 100ma v out c2 c2 + gnd v in c1 c1 + shdn/ss typical applicatio u

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