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1 ltc1174 ltc1174-3.3/ltc1174-5 high efficiency step-down and inverting dc/dc converter s f ea t u re d u escriptio load current (ma) 1 efficiency (%) 100 95 90 85 80 75 70 10 100 1174 ta02 200 v in = 6v v in = 9v l = 100 m h v out = 5v i pgm = 0v high efficiency step-down converter + v in 9v + 3 ltc1174-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 100 m h ? 100 m f** 10v 5v 175ma 3 15 m f* 25v 1n5818 1174 ta01 * ** ? (3) avx tpsd156k025 avx tpsd107k010 coiltronics ctx100-4 ltc1174-5 efficiency u a o pp l ic at i ty p i ca l n high efficiency: up to 94% n peak inductor current independent of inductor value n short-circuit protection n optimized for 5v to C 5v applications n wide v in range: 4v to 18.5v n low dropout operation n low-battery detector n pin selectable current limit n internal 0.9 w power switch: v in = 9v n only four external components required n 130 m a standby current n active low micropower shutdown n distributed power systems n step-down converters n inverting converters n memory backup supply n portable instruments n battery-powered equipment the ltc ? 1174 is a simple current mode dc/dc converter ideally suited for 9v to 5v, 5v to 3.3v, or 5v to C 5v operation. with an internal 0.9 w switch (at a supply voltage of 9v), the ltc1174 requires only four external components to construct a complete high efficiency dc/dc converter. under a no load condition the lt1174 draws only 130 m a. in shutdown, it draws a mere 1 m a making this converter ideal for current sensitive applications. in dropout, the internal p-channel mosfet switch is turned on continu- ously allowing the user to maximize the life of the battery source. the maximum inductor current of the ltc1174 family is pin selectable to either 340ma or 600ma, optimizing efficiency for a wide range of applications. operation up to 200khz permits the use of small surface mount inductors and capacitors. for applications requiring higher output current or ultra- high efficiency, see the ltc1148 data sheet. u s a o pp l ic at i and ltc are registered trademarks and lt is a trademark of linear technology corporation.
2 ltc1174 ltc1174-3.3/ltc1174-5 a u g w a w u w a r b s o lu t exi t i s (voltage referred to gnd pin) input supply voltage (pin 6) ltc1174 ................................................ C 0.3v to 13.5v ltc1174hv ............................................C 0.3v to 18.5v switch current (pin 5) ............................................... 1a switch voltage (pin 5) ltc1174 ..................................................... v in C 13.5v ltc1174hv ................................................ v in C 18.5v operating temperature range .................... 0 c to 70 c extended commercial temperature range ................................ C 40 c to 85 c junction temperature (note 1) ............................ 125 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c order part number order part number wu u package / o rder i for atio s8 part marking ltc1174cn8 ltc1174cn8-3.3 ltc1174cn8-5 ltc1174hvcn8 ltc1174hvcn8-3.3 ltc1174hvcn8-5 ltc1174in8 ltc1174cs8 ltc1174cs8-3.3 ltc1174cs8-5 ltc1174is8 ltc1174hvcs8 ltc1174hvcs8-3.3 ltc1174hvcs8-5 1174hv 1174h3 1174h5 1174 117433 117450 1174i consult factory for military grade parts. t jmax = 125 c, q ja = 150 c/w t jmax = 125 c, q ja = 110 c/w 1 2 3 4 8 7 6 5 top view v out (v fb *) lb out lb in gnd shutdown i pgm v in sw n8 package 8-lead plastic dip * adjustable output version symbol parameter conditions min typ max units i fb feedback current ltc1174/ltc1174hv 1 m a v fb feedback voltage ltc1174/ltc1174hv l 1.20 1.25 1.30 v v out regulated output voltage ltc1174-3.3/ltc1174hv-3.3 l 3.14 3.30 3.46 v ltc1174-5/ltc1174hv-5 l 4.75 5.00 5.25 v d v out output voltage line regulation v in = 6v to 12v, i load = 100ma, i pgm = v in (note 2) 10 70 mv output voltage load regulation ltc1174-3.3 (note 2) 20ma < i load < 175ma, i pgm = 0v C 5 C 70 mv 20ma < i load < 400ma, i pgm = v in C 45 C 70 mv ltc1174-5 (note 2) 20ma < i load < 175ma, i pgm = 0v C 5 C 70 mv 20ma < i load < 400ma, i pgm = v in C 50 C 70 mv e lectr ic al c c hara terist ics t a = 25 c, v in = 9v, v shutdown = v in , i pgm = 0v, unless otherwise noted. 1 2 3 4 8 7 6 5 top view s8 package 8-lead plastic soic * adjustable output version v out (v fb *) lb out lb in gnd shutdown i pgm v in sw
3 ltc1174 ltc1174-3.3/ltc1174-5 e lectr ic al c c hara terist ics t a = 25 c, v in = 9v, v shutdown = v in , i pgm = 0v, unless otherwise noted. C40 c t a 85 c (note 6), for ltc1174i only. symbol parameter conditions min typ max units v fb feedback voltage ltc1174i 1.18 1.25 1.31 v i lbout current sunk by pin 2 v lbout = 0.4 0.75 1.2 2 ma i peak current limit i pgm = v in , v out = 0v 0.54 0.60 0.78 a i pgm = 0v, v out = 0v 0.34 a t off switch off-time (note 5) v out at regulated value 2 4 6 m s the l denotes specifications which apply over the full operating temperature range. note 1: t j is calculated from the ambient temperature t a and power dissipation p d according to the following formulas: ltc1174cn8, ltc1174cn8-3.3, ltc1174cn8-5: t j = t a + (p d 110 c/w) ltc1174cs8, ltc1174cs8-3.3, ltc1174cs8-5: t j = t a + (p d 150 c/w) note 2: guaranteed by design. note 3: dynamic supply current is higher due to the gate charge being delivered at the switching frequency. note 4: current into pin 6 only, measured without electrolytic input capacitor. note 5: the off-time is wafer-sort trimmed. note 6: the ltc1174i is not tested and not quality assurance sampled at C40 c and 85 c. these specifications are guaranteed by design and/or correlation. symbol parameter conditions min typ max units i q input dc supply current (note 3) active mode ltc1174: 4v < v in < 12v, i pgm = 0v 450 600 m a ltc1174hv: 4v < v in < 16v, i pgm = 0v 450 600 m a sleep mode ltc1174: 4v < v in < 12v 130 180 m a ltc1174hv: 4v < v in < 16v 130 180 m a shutdown (note 4) ltc1174: v shutdown = 0v, 4v < v in < 12v 1 10 m a ltc1174hv: v shutdown = 0v, 4v < v in < 16v 2 25 m a v lbtrip low-battery trip point 1.25 1.4 v i lbin current into pin 3 0.5 m a i lbout current sunk by pin 2 ltc1174: v lbout = 0.4v 1.0 1.2 1.5 ma ltc1174hv: v lbout = 0.4v 0.6 0.8 1.5 ma v hyst comparator hysteresis ltc1174/ltc1174hv 7.5 15 30 mv i peak current limit i pgm = v in , v out = 0v l 0.54 0.60 0.78 a i pgm = 0v, v out = 0v l 0.27 0.34 0.50 a r on on resistance of switch ltc1174 l 0.75 1.30 w ltc1174hv l 0.90 1.55 w t off switch off-time (note 5) v out at regulated value 3 4 5 m s v ih shutdown pin high minimum voltage at pin 8 for device to be active 1.2 v v il shutdown pin low maximum voltage at pin 8 for device to be in shutdown 0.75 v i ih shutdown pin input current ltc1174: v shutdown = 12v 0.5 m a ltc1174hv: v shutdown = 16v 2.0 i il shutdown pin input current 0 v shutdown 0.8v 0.5 m a
4 ltc1174 ltc1174-3.3/ltc1174-5 cc hara terist ics uw a t y p i ca lper f o r c e load current (ma) 1 efficiency (%) 100 95 90 85 80 75 70 10 100 1174 g01 200 v in = 6v v in = 9v l = 50 m h v out = 5v i pgm = 0v coil = ctx50-4 efficiency vs load current efficiency vs load current load current (ma) 1 efficiency (%) 10 100 1174 g02 400 100 95 90 85 80 75 70 l = 50 m h v out = 5v i pgm = v in coil = ctx50-4 v in = 6v v in = 9v load current (ma) 1 efficiency (%) 10 100 1174 g03 500 100 95 90 85 80 75 70 l = 100 m h v out = 5v i pgm = v in coil = ctx100-4 v in = 6v v in = 9v efficiency vs load current efficiency vs load current efficiency vs load current load current (ma) 1 efficiency (%) 10 100 1174 g04 300 100 90 80 70 60 50 l = 50 m h v out = 3.3v i pgm = 0v coil = ctx50-4 v in = 5v v in = 9v efficiency vs load current load current (ma) 1 efficiency (%) 10 100 1174 g05 500 100 90 80 70 60 50 l = 50 m h v out = 3.3v i pgm = v in coil = ctx50-4 v in = 5v v in = 9v load current (ma) 1 efficiency (%) 10 100 1174 g06 500 100 90 80 70 60 50 l = 100 m h v out = 3.3v i pgm = v in coil = ctx100-4 v in = 5v v in = 9v line regulation switch leakage current vs temperature temperature (?) 0 leakage current (na) 180 160 140 120 100 80 60 40 20 0 40 80 100 1174 g08 20 60 v in = 13.5v input voltage (v) 5 efficiency (%) 14 1174 g09 7 9 12 95 94 93 92 91 90 89 88 87 68 10 11 13 l = 100 m h l = 50 m h v out = 5v i pgm = 0v i load = 75ma core = ctx (kool m m ) efficiency vs input voltage kool m m ? is a registered trademark of magnetics, inc. input voltage (v) 0 d v out (mv) 6 4 2 0 ? ? ? ? 10 12 ?4 4 8 10 1174 g07 2 6 12 14 i load = 100ma i pgm = 0v
5 ltc1174 ltc1174-3.3/ltc1174-5 cc hara terist ics uw a t y p i ca lper f o r c e supply current in shutdown switch resistance vs input voltage input voltage (v) 0 supply current ( m a) 8 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1174 g11 414 2 6 10 12 shutdown = 0v t a = 25? current into pin 6 only input voltage (v) 5 efficiency (%) 7 9 10 14 1174 g10 68 11 12 13 95 94 93 92 91 90 89 v out = 5v l = 100 m h coil = ctx100-4 i load = 300ma i pgm = v in i load = 100ma i pgm = 0v efficiency vs input voltage dc supply current input voltage (v) 0 supply current ( m a) 500 450 400 350 300 250 200 150 100 50 0 4 8 10 1174 g12 2 6 12 14 active mode i pgm = v in sleep mode i pgm = 0v t a = 25? operating frequency vs v in C v out (v in ?v out ) voltage (v) 0 normalized frequency 9 1174 g13 2 57 2.0 1.5 1.0 0.5 0 1 3 4 6 8 v out = 5v t a = 25? t a = 70? off-time vs output voltage sw (pin 5): drain of the p-channel mosfet switch. cathode of schottky diode must be closely connected to this pin. v in (pin 6): input supply voltage. it must be decoupled close to ground pin 4. i pgm (pin 7): selects the current limit of the p-channel switch. with i pgm = v in , the current trip point is 600ma and with i pgm = 0v, the current trip value is reduced to 340ma. shutdown (pin 8): pulling this pin to ground keeps the internal switch off and puts the ltc1174 in micropower shutdown. pi fu ctio s u uu v out (v fb ) (pin 1): for the ltc1174, this pin connects to the main voltage comparators input. on the ltc1174-3.3 and ltc1174-5 this pin goes to an internal resistive divider which sets the output voltage. lb out (pin 2): open drain of an n-channel pull-down. this pin will sink current when pin 3 (lb in ) goes below 1.25v. during shutdown this pin goes to high impedance. lb in (pin 3): the C input of the low-battery voltage comparator. the + input is connected to a reference voltage of 1.25v. gnd (pin 4): ground pin. output voltage (v) 0 off-time ( m s) 50 40 30 20 10 0 4 1174 g15 1 2 3 5 ltc1174-5 ltc1174hv-5 ltc1174-3.3 ltc1174hv-3.3 input voltage (v) 4 rds (on) ( w ) 12 1174 g14 6 8 10 14 16 18 20 t a = 25? 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 ltc1174hv ltc1174
6 ltc1174 ltc1174-3.3/ltc1174-5 fu ctio al diagra u u w (pin 1 connection shown for ltc1174-3.3 and ltc1174-5, changes create ltc1174) + v th2 + + v lim2 v lim1 i pgm r sense 0.1 w reset v th1 lb out 2 1174 bd g m v fb 1.25v reference q gnd 4 5 sw 1 v out (v fb ) 7 + a1 r1* 31.5k set 6 v in lb in 3 shutdown 8 c t sleep + a3 a4 a5 v fb * r1 = 51k for ltc1174-3.3 r1 = 93.5k for ltc1174-5 a2 operatio u (refer to functional diagram) the ltc1174 uses a constant off-time architecture to switch its internal p-channel power mosfet. the off-time is set by an internal timing capacitor and the operating frequency is a function of v in . the output voltage is set by an internal resistive divider (ltc1174-3.3 and ltc1174-5) or an external divider re- turned to v fb pin 1 (ltc1174). a voltage comparator a1 compares the divided output voltage to a reference voltage of 1.25v. to optimize efficiency, the ltc1174 automatically switches between continuous and burst mode tm operation. the volt- age comparator is the primary control element when the device is in burst mode operation, while the current com- parator controls the output voltage in continuous mode. during the switchon time, switch current flows through the 0.1 w sense resistor. when this current reaches the threshold of the current comparator a2, its output signal will change state, setting the flip-flop and turning the switch off. burst mode tm is a trademark of linear technology corporation. the timing capacitor, c t , begins to discharge until its voltage goes below v th1 . comparator a4 will then trip, which resets the flip-flop and causes the switch to turn on again. also, the timing capacitor is recharged. the inductor current will again ramp up until the current comparator a2 trips. the cycle then repeats. when the load is relatively light, the ltc1174 automatically goes into burst mode operation. the current mode loop is interrupted when the output voltage reaches the desired regulated value. the hysteretic voltage comparator a1 trips when v out is above the desired output voltage, shutting off the switch and causing the timing capacitor to discharge. this capacitor discharges past v th1 until its voltage drops below v th2 . comparator a5 then trips and a sleep signal is generated. in sleep mode, the ltc1174 is in standby and the load current is supplied by the output capacitor. all unused
7 ltc1174 ltc1174-3.3/ltc1174-5 where t off = 4 m s and v d is the voltage drop across the diode. note that the operating frequency is a function of the input and ouput voltage. although the size of the inductor does not affect the fre- quency, it does affect the ripple current. the peak-to-peak ripple current is given by: i vv l a ripple out d pp = + ? ? ? ? () - - 410 6 by choosing a smaller inductor, a low esr output filter capacitor has to be used (see c in and c out ). moreover, core loss will also increase (see inductor core selection section) due to higher ripple current. operatio u (refer to functional diagram) circuitry is shut off, reducing quiescent current from 0.45ma to 0.13ma. when the output capacitor discharges by the amount of the hysteresis of the comparator a1, the p-channel switch turns on again and the process repeats itself. operating frequency and inductor since the ltc1174 utilizes a constant off-time architecture, its operating frequency is dependent on the value of v in . the frequency of operation can be expressed as: f t vv vv hz off in out in d = - + ? ? ? ? () 1 u s a o pp l ic at i wu u i for atio inductor core selection with the value of l selected, the type of inductor must be chosen. basically there are two kinds of losses in an inductor, core and copper core losses are dependent on the peak-to-peak ripple current and the core material. however it is independent of the physical size of the core. by increasing the inductance the inductors peak-to-peak ripple current will decrease, therefore reducing core loss. utilizing low core loss mate- rial, such as molypermalloy or kool m m will allow users to concentrate on reducing copper loss and preventing satu- ration. figure 1 shows the effect of different core material on the efficiency of the ltc1174. the ctx core is kool m m and the ctxp core is powdered iron (material 52). although higher inductance reduces core loss, it increases copper loss as it requires more windings. when space is not a premium larger gauge wire can be used to reduce the wire resistance. this also prevents excessive heat dissipation. c in in continuous mode the source current of the p-channel mosfet is a square wave of duty cycle v out /v in . to prevent large voltage transients, a low esr input capacitor sized for figure 1. efficiency using different types of inductor core material load current (ma) 1 efficiency (%) 10 100 500 100 90 80 70 60 50 v in = 5v v out = 3.3v i pgm = v in ctx50-4 ctx50-4p 1174 f01 load current (ma) 1 efficiency (%) 10 100 500 100 90 80 70 60 50 v in = 5v v out = 3.3v i pgm = v in ctx100-4 ctx100-4p
8 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i wu u i for atio the diode conducts only a small fraction of the time. the most stressful condition for the diode is when the output is short-circuited. under this condition the diode must safely handle i peak at close to 100% duty cycle. a fast switching diode must also be used to optimize efficiency. schottky diodes are a good choice for low forward drop and fast switching times. most ltc1174 circuits will be well served by either a 1n5818, a mbrs140t3 or a mbr0520l schot- tky diode. short-circuit protection the ltc1174 is protected from output short by its internal current limit. depending on the condition of i pgm pin, the limit is either set to 340ma or 600ma. in addition, the off- time of the switch is increased to allow the inductors current to decay far enough to prevent any current build-up (see figure 2). the maximum rms current must be used. the c in rms current is given by: i ivvv v a rms out out in out in rms ? - () [] () 12 / this formula has a maximum at v in = 2v out , where i rms = i out /2. this simple worst case is commonly used for design because even significant deviations do not offer much relief. note that ripple current directly affects capacitors lifetime. do not underspecify this component. an additional 0.1 m f ceramic capacitor is also required on v in for high frequency decoupling. c out to avoid overheating, the output capacitor must be sized to handle the ripple current generated by the inductor. the worst case rms ripple current in the output capacitor is given by: i i a ma rms peak rms ? () = 2 170 or 300ma although the output voltage ripple is determined by the hysteresis of the voltage comparator, esr of the output capacitor is also a concern. too high of an esr will create a higher ripple output voltage and at the same time cause the ltc1174 to sleep less often. this will affect the efficiency of the ltc1174. for a given technology, esr is a direct function of the volume of the capacitor. several small-sized capacitors can also be paralleled to obtain the same esr as one large can. manufacturers such as nichicon, chemicon and sprague should be considered for high performance capacitors. the os-con semiconductor dielectric capaci- tor available from sanyo has the lowest esr for its size, at a higher price. catch diode selection the catch diode carries load current during the off-time. the average diode current is therefore dependent on the p-channel switch duty cycle. at high input voltages the diode conducts most of the time. as v in approaches v out low-battery detector the low-battery indicator senses the input voltage through an external resistive divider. this divided voltage connects to the C input of a voltage comparator (pin 3) which is compared with a 1.25v reference voltage. with the current going into pin 3 being negligible, the following expression is used for setting the trip limit: v r r lbtrip =+ ? ? ? ? 125 1 4 3 . i pgm = v in i pgm = 0 gnd l = 100 m h v in = 13.5v 100ma/div 20 m s/div 1174 f02 figure 2. inductor's current with output shorted
9 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i wu u i for atio figure 3. low-battery comparator ltc1174 + 1.25v reference r4 r3 3 v in 1174 f03 ltc1174 adjustable applications the ltc1174 develops a 1.25v reference voltage between the feedback (pin 1) terminal and ground (see figure 4). by selecting resistor r1, a constant current is caused to flow through r1 and r2 to set the overall output voltage. the regulated output voltage is determined by: v r r out =+ ? ? ? ? 125 1 2 1 . for most applications, a 30k resistor is suggested for r1. to prevent stray pickup, a 100pf capacitor is suggested across r1 located close to the ltc1174. figure 4. ltc1174 adjustable configuration ltc1174 v fb r2 r1 1 v out 1174 f04 100pf inverting applications the ltc1174 can easily be set up for a negative output voltage. if C 5v is desired, the ltc1174-5 is ideal for this application as it requires the least components. figure 5 shows the schematic for this application. note that the output voltage is now taken off the gnd pin. therefore, the maximum input voltage is now determined by the difference between the absolute maximum voltage rating and the output voltage. a maximum of 12v is specified in + + 3 ltc1174hv-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 50 m h** v out 5v 45ma 2 47 m f* 16v mbrs140t3 1174 f05 * ** avx tpsd476k016 coiltronics ctx50-4 input voltage 4v to 12v 0.1 m f + 2 47 m f* 16v figure 5. positive-to-negative 5v converter figure 5, giving the circuit a 1.5v of headroom for v in . note that the circuit can operate from a minimum of 4v, making it ideal for a 4 nicad cell application. for a higher output current circuit, please refer to the typical applica- tions section. board layout checklist when laying out the printed circuit board, the following checklist should be used to ensure proper operation of the ltc1174. these items are also illustrated graphically in the layout diagram in figure 6. check the following in your layout: 1. is the schottky catch diode closely connected between ground (pin 4) and switch (pin 5)? 2. is the + plate of c in closely connected to v in (pin 6)? this capacitor provides the ac current to the internal p-channel mosfet. 3. is the 0.1 m f v in decoupling capacitor closely conected between v in (pin 6) and ground (pin 4)? this capacitor carries the high frequency peak currents. 4. is the shutdown (pin 8) actively pulled to v in during normal operation? the shutdown pin is high imped- ance and must not be allowed to float. 5. is the i pgm (pin 7) pulled either to v in or ground? the i pgm pin is high impedance and must not be allowed to float.
10 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i wu u i for atio figure 6. ltc1174 layout diagram (see board layout checklist) design example as a design example, assume v in = 9v (nominal), v out = 5v, and i out = 350ma maximum. the ltc1174-5 is used for this application, with i pgm (pin 7) connected to v in . the minmum value of l is determined by assuming the ltc1174-5 is operating in continuous mode. figure 7. continuous inductor current inductor current time i peak i v avg current = i out = = 350ma i peak + i v 2 1174 f07 with i out = 350ma and i peak = 0.6a (i pgm = v in ), i v = 0.1a.the peak-to-peak ripple inductor current, i ripple , is 0.5a and is also equal to: i vv l a ripple out d pp = + ? ? ? ? () - - 410 6 solving for l in the above equation and with v d = 0.6v, l = 44.8 m h. the next higher standard value of l is 50 m h (example: coiltronics ctx50-4). the operating frequency, neglecting voltage across diode v d is: f v v khz out in ? - ? ? ? ? = 2 5 10 1 111 5 . with the value of l determined, the requirements for c in and c out are calculated. for c in , its rms current rating should be at least: i ivvv v a ma rms out out in out in rms = - () [] () = 12 174 / for c out , the rms current rating should be at least: i i a ma rms peak rms ? () = 2 300 now allow v in to drop to 6v. at this minimum input voltage the operating frequency will decrease. the new frequency is 42khz. + 3 ltc1174 2 sw r1 8 7 6 1 5 4 l v out d 1174 f06 output divider required with adjustable version only 0.1 m f lb out lb in gnd shutdown i pgm v in r2 bold lines indicate high current path v in c in c out v out (v fb )
11 ltc1174 ltc1174-3.3/ltc1174-5 high efficiency 3.3v regulator u s a o pp l ic at i wu u i for atio table 2. capacitor manufacturers manufacturer part number avx corporation tps series p.o. box 887 taj series myrtle beach, sc 29578 (803) 448-9411 nichicon america corporation pl series 927 east state parkway schaberg, il 60173 (708) 843-7500 sanyo video components os-con series 2001 sanyo avenue san diego, ca 92173 (619) 661-6385 attn: sales dept. u s a o pp l ic at i ty p i ca l 6v to 5v step-down regulator with low-battery detection 1174 ta03 input voltage 6v + 3 ltc1174-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 l1 ? 100 m h v out 5v 365ma 2 47 m f** 16v d1 0.1 m f + 2 47 m f** 16v *low- battery indicator 4.7k 162k 47.5k * ** d1 ? low-battery indicator is set to trip at v in = 5.5v avx tpsd476k016 = mbrs140t3 (surface mount) 1n5818 l1 selection manufacturer coiltronics sumida gowanda part no. ctx100-4 cd75-101 ga10-103k type surface mount surface mount through hole table 1. inductor manufacturers manufacturer part number coilcraft dt3316 series 1102 silver lake road cary, il 60013 (708) 639-2361 coiltronics inc. econo-pac 6000 park of commerce blvd. octa-pac boca raton, fl 33487 (407) 241-7876 gowanda electronics corporation ga10 series 1 industrial place gowanda, ny 14070 (716) 532-2234 sumida electric co. ltd. cd 54 series 637 e. golf road, suite 209 cd 75 series arlington heights, il 60005 (708) 956-0666/7 1174 ta04 + 3 ltc1174-3.3 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 50 m h ? v out 3.3v 425ma 3 22 m f* 25v 1n5818 0.1 m f + 2 47 m f** 16v input voltage 4v to 12.5v * ** ? avx tpsd226k025 avx tpsd476k016 coiltronics ctx50-4
12 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i ty p i ca l high efficiency 3v regulator 1174 ta05 + 3 ltc1174 lb in lb out i pgm gnd v in shutdown v fb sw 2 7 6 8 1 5 4 50 m h ? v out 3v 450ma 3 22 m f* 25v 1n5818 0.1 m f + 2 100 m f** 10v input voltage 4v to 12.5v * ** ? avx tpsd226k025 avx tpsd105k010 coiltronics ctx50-4 42k 30k 100pf * ** *** d1 ? low-battery indicator is set to trip at v in = 4.4v avx tpsd106k035 avx tpsd105k010 = mbrs130lt3 (surface mount) 1n5818 l1 selection manufacturer coiltronics coilcraft sumida gowanda part no. ctx50-3 dt3316-473 cd54-470 ga10-472k type surface mount surface mount surface mount through hole 1174 ta06 input voltage 4v to 12.5v + 3 ltc1174hv-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 l1 ? 50 m h v out ?v 2 10 m f** 35v d1 0.1 m f + 100 m f*** 10v *low- battery indicator 4.7k 280k 43k v in (v) 4 6 8 10 12.5 i out max (ma) 110 140 170 200 235 positive-to-negative (C 5v) converter 1174 ta07 input voltage 4v to 13.5v + 3 ltc1174hv-3.3 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 l1 ? 50 m h v out 3.3v 210ma 2 33 m f** 20v d1 0.1 m f + 2 100 m f*** 10v *low- battery indicator 4.7k 220k 43k * ** *** d1 ? low-battery indicator is set to trip at v in = 4.4v avx tpsd336k020 avx tpsd105k010 = mbrs140t3 (surface mount) 1n5818 l1 selection manufacturer coiltronics coilcraft sumida gowanda part no. ctx50-3 dt3316-473 cd54-470 ga10-472k type surface mount surface mount surface mount through hole i out max (ma) 175 205 230 255 v in (v) 4 5 6 7 positive-to-negative (C 3.3v) converter
13 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i ty p i ca l negative boost converter lcd display power supply 9v to 5v pre-post regulator 1174 ta09 input voltage 6v to 12.5v 3 ltc1174 lb in lb out i pgm gnd v in shutdown v fb sw 2 7 6 8 1 5 4 l1 ? 50 m h v out 5v 150ma d1 1 m f solid tantalum + 2 47 m f** 16v 110k ?? 0.1 m f * ** d1 ? sanyo os-con avx tpsd476k016 = mbrs140t3 (surface mount) 1n5818 l1 selection manufacturer coiltronics coilcraft sumida gowanda part no. ctx50-3 dt3316-473 cd54-470 ga10-472k type surface mount surface mount surface mount through hole ?? use 1% metal film resistors 30.1k ?? lt1121-5 out gnd 8 1 5 v in shutdown 3 + 0.1 m f + 100 m f* 16v 100pf 1174 ta08 input voltage ?v + 3 ltc1174-3.3 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 l1 ? 50 m h v out 9v 175ma 2 33 m f* 16v d1 0.1 m f + 2 33 m f* 20v 310k 50k * d1 ? avx tpsd336k020 = mbrs140t3 (surface mount) 1n5818 l1 selection 0.1 m f manufacturer coiltronics coilcraft sumida gowanda part no. ctx50-3 dt3316-473 cd54-470 ga10-472k type surface mount surface mount surface mount through hole 1174 ta10 input voltage 4v to 12.5v + 3 ltc1174 lb in lb out i pgm gnd v in shutdown v fb sw 2 7 6 8 1 5 4 l1 ? 100 m h v out 24v 50ma at v in = 9v 2 47 m f** 16v 0.1 m f + 4 10 m f* 50v 1n914 998k ?? v in (v) 4 5 6 7 8 9 10 11 12 i out max (ma) 20 25 30 35 43 50 55 60 65 si9035 d1 50k ?? 56.2k ?? 0.1 m f * ** d1 ? avx taje106k050 avx tpsd476k016 = mbrs140t3 (surface mount) 1n5818 l1 selection manufacturer coiltronics coilcraft sumida gowanda part no. ctx100-3 dt3316-104 cd75-101 ga10-103k type surface mount surface mount surface mount through hole ?? use 1% metal film resistors 2n2222 2n5210
14 ltc1174 ltc1174-3.3/ltc1174-5 9v to 5v, C 5v outputs u s a o pp l ic at i ty p i ca l 9v to 12v, C 12v outputs 1174 ta12 input voltage 4v to 12.5v + 3 ltc1174 lb in lb out i pgm gnd v in shutdown v fb sw 2 7 6 8 1 5 4 l1b ? 100 m h ? out ?2v 55ma at v in = 9v 3.3 m f** 1n914 si9430dy + mbrs140t3 mbrs140t3 l1a ? 100 m h 1 2 4 3 v out 12v 55ma at v in = 9v 0.1 m f * ** ? ?? avx tajd226k035 wima mks2 coiltronics ctx100-4 use 1% metal film resistors v in (v) 4 5 6 7 8 9 10 11 12 i out max (ma) 20 25 35 45 50 55 62 67 73 3 22 m f* 35v l1a l1b 2 3 4 1 ctx100-4 301k ?? + 2 22 m f* 35v 2 22 m f* 35v 34k ?? 1174 ta11 input voltage 4v to 12.5v + + + 3 ltc1174-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 l1b ? 100 m h ? out 5v 135ma at v in = 9v 3.3 m f** + 100 m f* 16v mbrs140t3 l1a ? 100 m h v out 5v 135ma at v in = 9v 0.1 m f 0.1 m f * ** ? sanyo os-con wima mks2 coiltronics ctx100-4 v in (v) 4 6 8 10 12 13 i out max (ma) 75 100 125 145 160 180 100 m f* 20v + 100 m f* 16v l1a l1b 2 3 4 1 ctx100-4 mbrs140t3
15 ltc1174 ltc1174-3.3/ltc1174-5 u s a o pp l ic at i ty p i ca l automatic current selection buck-boost converter battery charger 1174 ta13 input voltage 6v to 12.5v + 3 ltc1174-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 50 m h ? v out 5v 0ma to 320ma 100 m f* 20v + 100 m f* 16v 1n5818 100k * ? sanyo os-con capacitor coiltronics ctx50-4 0.1 m f 100k 36.5k tpo610l 100k 1174 ta14 input voltage 4v to 12v + 3 ltc1174hv-5 lb in lb out i pgm gnd v in shutdown v out sw 2 7 6 8 1 5 4 3.3 m f** l1a ? 100 m h 1 2 l2a ? 100 m h 4 3 v out 5v 160ma 0.1 m f * ** ? sanyo os-con wima mks2 coiltronics ctx100-4 100 m f* 20v l1a l1b 2 3 4 1 ctx100-4 + 100 m f* 16v 1n5818 1174 ta15 input voltage 8v to 12.5v + 3 ltc1174 lb in lb out i pgm gnd v in shutdown v fb sw 2 7 6 8 1 5 4 d1 l1 ? 50 m h v out to 4 nicad battery 0.1 m f + 100 m f** 10v 33k 150k v in (v) 8 9 10 11 12 i out max (ma) 320 325 330 335 335 * ** d1,d2 ? avx tajd226k020 avx tajd107k010 = mbrs140t3 (surface mount) 1n5818 l1 selection manufacturer coiltronics coilcraft sumida gowanda part no. ctx50-2p dt3316-473 cd54-470 ga10-472k type surface mount surface mount surface mount through hole 2 22 m f* 20v d2 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.
16 ltc1174 ltc1174-3.3/ltc1174-5 ? linear technology corporation 1994 package descriptio u dimensions in inches (millimeters) unless otherwise noted. lt/gp 0894 2k rev b ? printed in usa n8 package 8-lead plastic dip s8 package 8-lead plastic soic linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 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 0294 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) bsc *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.006 inch (0.15mm). n8 0694 0.045 ?0.015 (1.143 ?0.381) 0.100 ?0.010 (2.540 ?0.254) 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 ?0.005 (3.302 ?0.127) 0.015 (0.380) min 0.018 ?0.003 (0.457 ?0.076) 0.125 (3.175) min 12 3 4 87 6 5 0.255 ?0.015* (6.477 ?0.381) 0.400* (10.160) max 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.025 0.015 +0.635 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protursions shall not exceed 0.010 inch (0.254mm).

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