View LTC3529_4601757.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LTC3529 1 3529fa 1 1000 100 10 3529 ta01b power loss (w) 0.9 0.8 0.7 0.6 0 0.5 0.4 0.3 0.2 0.1 power loss efficiency v in = 3.6v inductor = 4.7h, cooper bussmann sd25-4r7 load current (ma) efficiency (%) 100 90 80 70 0 10 20 30 60 50 40 3529 ta01a LTC3529 v in sw 3.3f 370 li-ion 2.5v to 4.2v v out 5v 500ma 4.7h fault snsgnd rst v out shdn pgnd c out 10f on off auto-restart on off + typical application features applications description 1.5a, 1.5mhz step-up dc/dc converter in 2mm 3mm dfn the ltc ? 3529 is a 5v output, synchronous, ? xed frequency step-up dc/dc converter optimized for usb on-the-go (otg) hosting applications. this compact usb otg 5v v bus converter features a 1.5mhz switching frequency, internal compensation and a tiny 2mm 3mm dfn pack- age. the LTC3529 can operate from input voltages as low as 1.8v. usb otg-speci? c features include a fault ? ag with 22ms deglitching to indicate when the bus is overloaded, output disconnect and short-circuit protection. following a fault, the LTC3529 can be programmed to either latchoff or restart after a time-out duration. additional features include a <1a shutdown mode, soft-start, inrush current limiting and thermal overload protection. anti-ring circuitry reduces emi during low power operation. the LTC3529 is offered in an 8-lead 2mm 3mm 0.75mm dfn package. l , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. protected by u.s. patents including 6404251, 6166527. li-ion battery to 5v synchronous boost converter n compact solution for 5v usb on-the-go v bus power n 5v at 500ma from single li-ion cell n automatic fault detection n high ef? ciency: up to 95% n v in range: 1.8v to 5.25v n fixed 5v output n short-circuit protection n 1.5mhz low noise, fixed frequency pwm n inrush current limiting and internal soft-start n output disconnect n <1a quiescent current in shutdown n v in > v out operation n 8-lead, 2mm 3mm dfn package n personal media players n digital video cameras n digital multimedia broadcast tuners n digital cameras n smart phones ef? ciency vs load current
LTC3529 2 3529fa pin configuration absolute maximum ratings v in , v out voltage ............................................C0.3 to 6v shdn , rst, fault voltage ..............................C0.3 to 6v sw voltage dc ...............................................................C0.3 to 6v pulsed <100ns ............................................ C1v to 7v operating temperature range (note 2).... C40c to 85c maximum junction temperature (note 3)............. 125c storage temperature range ................... C65c to 125c (note 1) top view v in rst snsgnd fault v out sw shdn pgnd dcb package 8-lead (2mm s 3mm) plastic dfn 9 3 4 2 1 6 5 7 8 t jmax = 125c, ja = 64c/w exposed pad (pin 9) is gnd, must be soldered to pcb order information electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 3.6v, v out = 5v unless otherwise noted. parameter conditions min typ max units input voltage range 1.8 5.25 v output voltage l 4.85 5 5.15 v quiescent current - shutdown v shdn = 0v, v out = 0v 0.01 1 a nmos switch leakage current v sw = 5v l 0.3 15 a pmos switch leakage current v sw = 0v, v out = 5v l 0.3 15 a nmos switch on resistance 0.09 pmos switch on resistance 0.12 nmos current limit (note 4) l 1.5 a current limit delay time to output (note 5) 40 ns maximum duty cycle v out = 4.5v l 80 87 % minimum duty cycle v out = 5.5v l 0% switching frequency l 1.2 1.5 1.8 mhz shdn , rst input high voltage l 1v shdn , rst input low voltage l 0.35 v shdn , rst input current v shdn , v burst , v rst = 5.5v l 0.01 1 a soft-start time 2ms line regulation v in = 1.8v to 5.25v 0.03 %/ v lead free finish tape and reel part marking package description temperature range LTC3529edcb#pbf LTC3529edcb#trpbf lctz 8-lead (2mm 3mm) plastic dfn C40c to 85c consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on non-standard lead based ? nish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/
LTC3529 3 3529fa load current (ma) 1 1000 100 10 3529 g01 v in = 3v v in = 1.8v v in = 3v v in = 1.8v c out = 10f inductor = 4.7h, cooper bussmann sd25-4r7 power loss (w) 0.7 0.6 0 0.5 0.4 0.3 0.2 0.1 power loss efficiency efficiency (%) 100 90 80 70 0 10 20 30 60 50 40 load current (ma) 1 efficiency (%) 1000 100 10 3529 g02 100 90 80 70 0 10 20 30 60 50 40 c out = 10f inductor = 4.7h, cooper bussmann sd25-4r7 power loss (w) 0.7 0.6 0 0.5 0.4 0.3 0.2 0.1 v in = 3v v in = 3.6v v in = 4.1v power loss efficiency electrical characteristics note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the LTC3529 is guaranteed to meet performance speci? cations from 0c to 85c. speci? cations over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 3.6v, v out = 5v unless otherwise noted. parameter conditions min typ max units fault delay time 12 22 35 ms fault output low voltage i fault = 5ma 60 mv fault leakage current v fault = 5.5v 10 a note 3: this ic includes overtemperature protection that is intended to protect the device during momentary overload conditions. junction temperature will exceed 125c when overtemperature protection is active. continuous operation above the speci? ed maximum operating junction temperature may impair device reliability. note 4: current measurements are performed when the LTC3529 is not switching. the current limit values in operation will be somewhat higher due to the propagation delay of the comparators. note 5: speci? cation is guaranteed by design and not 100% tested in production. 2 alkaline cells to 5v ef? ciency li-ion battery to 5v ef? ciency load transient response typical performance characteristics soft-start waveforms 2ms/div 3529 g03 v out 5v/div i l 200ma/div shdn 5v/div v in = 3.6v v out = 5v c out = 10f l = 2.2h 200s/div 3529 g04 v out 200mv/div i l 500ma/div v in = 3.6v v out = 5v c out = 10f l = 2.2h v out ripple 1s/div 3529 g05 v out 5mv/div v in = 3.6v c out = 10f l = 4.7h i load = 200ma
LTC3529 4 3529fa r ds(on) (m) 3529 g12 160 140 120 100 80 60 20 40 0 temperature (c) C50 125 100 75 50 25 0 C25 pmos nmos normalized to 25c (%) 3529 g10 10 0 2 4 6 8 C10 C8 C6 C4 C2 temperature (c) C50 110 90 70 50 30 10 C30 C10 temperature (c) C50 change from 25c (%) 150 100 050 3529 g07 1.0 0.8 0.6 0.4 0.2 C0.8 C0.6 C0.4 C0.2 0 C1.0 temperature (c) C45 C25 current limit (a) 115 95 75 C5 35 55 15 3529 g06 1.90 1.40 1.45 1.50 1.55 1.80 1.65 1.60 1.75 1.70 1.85 typical performance characteristics current limit vs temperature switching frequency variation vs temperature no-load input current vs v in r ds(on) vs temperature output voltage change vs temperature 1s/div 3529 g09 sw 2v/div i l 25ma/div v in = 3.6v c out = 10f l = 4.7h sw pin anti-ringing quiescent current (ma) 3529 g11 18 16 14 12 10 8 6 2 4 0 v in (v) 1.5 5.5 4.5 3.5 2.5 i out (ma) 3529 g08 1600 1400 1200 1000 800 600 400 200 0 v in (v) 1.5 5.0 4.5 4.0 3.5 3.0 2.0 2.5 l = 4.7h maximum output current vs v in i load (ma) 0 v out change (%) 500 400 300 100 200 3529 g13 0.5 0.4 0.3 0.2 0.1 C0.4 C0.3 C0.2 C0.1 0 C0.5 v in = 3.3v l = 4.7h load regulation
LTC3529 5 3529fa pin functions v out (pin 1): converter output, voltage sense input and drain of the internal synchronous recti? er mosfet. driver bias is derived from v out . pcb trace length from v out to the output ? lter capacitor(s) should be as short and wide as possible. sw (pin 2): switch node. this node connects to one side of the inductor. keep pcb traces as short and wide as possible to reduce emi and voltage overshoot. if the inductor current falls to zero, or shdn is low, an internal 100 anti-ringing switch is connected between sw and v in to minimize emi. shdn (pin 3): active-low shutdown input. forcing this pin above 1v enables the converter. forcing this pin below 0.35v disables the converter. do not ? oat this pin. pgnd (pin 4): high current ground connection. the pcb trace connecting this pin to ground should be as short and as wide as possible. fault (pin 5): open-drain fault indicator output. pulls low when an overcurrent condition exists for more than 22ms. snsgnd (pin 6): this pin must be connected to ground. rst (pin 7): logic input to select automatic restart or latchoff following a fault shutdown. ? rst = high: auto-reset mode. in this mode, the LTC3529 will automatically attempt to restart 22ms (typically) after a fault shutdown. ? rst = low: latchoff mode. in this mode, the LTC3529 will latch off for a fault shutdown. the ic will not restart until the shdn pin is toggled or the supply voltage is cycled. v in (pin 8): input supply pin. exposed pad (pin 9): small signal ground. this is the ground reference for the internal circuitry of the LTC3529 and must be connected directly to ground.
LTC3529 6 3529fa the LTC3529 is a 1.5mhz synchronous boost converter in an 8-lead 2mm 3mm dfn package. the device operates with an input voltage as low as 1.8v and features ? xed- frequency current-mode pwm control for exceptional line and load regulation. internal mosfet switches with low r ds(on) and low gate charge enable the device to maintain high ef? ciency over a wide range of load current. pwm operation the LTC3529 operates in a ? xed-frequency pwm mode using current-mode control at all load currents. at very block diagram light loads, the LTC3529 will exhibit pulse-skipping operation. soft-start the LTC3529 provides soft-start by ramping the inductor current limit from zero to its peak value in approximately 2ms. the internal soft-start capacitor is discharged in the event of a fault, thermal shutdown or when the ic is disabled via the shdn pin. 3529 bd sw c in 3.3f 1.8v to 5.25v v out , 5v l1 4.7h fault v out shdn c out 10f 2 pgnd 4 gnd (bp) 9 rst 7 v in v in v in 8 3 5 snsgnd 6 1 22ms fault timer anti-ring pwm logic and drivers clock fault or thermal shutdown bulk control signals current sense C + C + + C + C soft-start 1.25v 2a sd c c c2 1.25v r2 625k thermal sd reference gm error amplifier oscillator 3 + + + C izero comp pwm comp i lim comp r1 1.875m r c operation
LTC3529 7 3529fa operation oscillator an internal oscillator sets the switching frequency to 1.5mhz. shutdown the LTC3529 is shut down by pulling the shdn pin below 0.35v, and activated by pulling the shdn pin above 1v. note that shdn can be driven above v in or v out , as long as it is limited to less than the absolute maximum rating. error ampli? er the error ampli? er is a transconductance ampli? er with an internal compensation network. internal clamps limit the minimum and maximum error ampli? er output voltage to improve the large-signal transient response. current sensing lossless current sensing converts the peak current sig- nal of the n-channel mosfet switch into a voltage that is summed with the internal slope compensation. the summed signal is compared to the error ampli? er output to provide a peak current control command for the pwm. peak switch current is limited to approximately 2a inde- pendent of input or output voltage. current limit the current limit comparator shuts off the n-channel mosfet switch when the current limit threshold is reached. the current limit comparator delay time to output is typically 40ns. fault detection to prevent the device from providing power to a shorted output, the switch current is monitored to detect an overcurrent condition. in the event that the switch current reaches the current limit for longer than 22ms, the fault ? ag is asserted ( fault pulls low) and the device is shut down. if the auto-restart option is enabled (rst high), the device will automatically attempt to restart every 22ms until the short is removed. if auto-restart is disabled (rst low), the ic will remain shut down until being manually restarted by toggling shdn or cycling the input voltage. a soft-start sequence is initiated when the device restarts. if output short circuits are common in the application, latchoff mode is highly recommended for maximum level of robustness. note: when v out is released from a short-circuit condi- tion, it is possible for the output to momentarily exceed the maximum output voltage rating. in cases where repeated shorts are expected, v out should be protected by the addition of a 5.6v zener clamp from v out to gnd. alternatively, c out can be increased to 47f or greater. zero-current comparator the zero-current comparator monitors the inductor cur- rent to the output and shuts off the synchronous recti? er when this current falls below approximately 20ma. this prevents the inductor current from reversing in polarity, thereby improving ef? ciency at light loads. anti-ringing control the anti-ringing circuit connects a resistor across the inductor to damp the ringing on sw in discontinuous conduction mode. the ringing of the resonant circuit formed by l and c sw (capacitance on the sw pin) is low energy but can cause emi radiation. output disconnect the LTC3529 provides true output disconnect by eliminating body diode conduction of the internal p-channel mosfet recti? er. this allows v out to go to zero volts during shut- down, drawing no current from the input source. it also provides inrush current limiting at turn-on, minimizing surge currents seen by the input supply. thermal shutdown if the die temperature reaches approximately 160c, the device enters thermal shutdown, the fault ? ag is asserted ( fault pulls low) and all switches are turned off. the device is enabled and a soft-start sequence is initiated when the die temperature drops by approximately 10c. pcb layout due to the high frequency operation of the LTC3529, board layout is extremely critical to minimize transients caused by stray inductance. keep the output ? lter capacitor as close as possible to the v out pin and use very low esr/esl ceramic capacitors tied to a good ground plane.
LTC3529 8 3529fa applications information the basic LTC3529 application circuit is shown in the typi- cal application on the front page. the external component selection is determined by the desired output current and ripple voltage requirements of each particular application. however, basic guidelines and considerations for the design process are provided in this section. output capacitor selection a low esr (equivalent series resistance) output capacitor should be used at the output of the LTC3529 to minimize the output voltage ripple. multilayer ceramic capacitors are an excellent choice as they have extremely low esr and are available in small footprints. x5r and x7r dielectric materials are strongly recommended over y5v dielectric because of their improved voltage and temperature coef- ? cients. neglecting the capacitor esr and esl (equivalent series inductance), the peak-to-peak output voltage ripple can be calculated by the following formula, where f is the frequency in mhz, c out is the capacitance in f, and i load is the output current in amps. v ivv cvf pp load out in out out ? = () ? ?? the internal loop compensation of the LTC3529 is designed to be stable with output capacitor values of 6.5f or greater. this complies with usb on-the-go speci? cations, which limit the output capacitance to 6.5f. in general use of the LTC3529, the output capacitor should be chosen large enough to reduce the output voltage ripple to acceptable levels. a 6.8f to 10f output capacitor is suf? cient for most applications. larger values up to 22f may be used to obtain extremely low output voltage ripple and improved transient response. although ceramic capacitors are recommended, low esr tantalum capacitors may also be used. a small ceramic capacitor in parallel with a larger tantalum capacitor is recommended in demanding applications that have large load transients. input capacitor selection low esr input capacitors reduce input switching noise and reduce the peak current drawn from the battery. it follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as possible to the device. a 3.3f input capacitor is suf? cient for most applications. larger values may be used without limitation. capacitor vendor information both the input and output capacitors used with the LTC3529 must have low esr and be designed to handle the large ac currents generated by switching converters. the ven- dors in table 1 provide capacitors that are well suited to LTC3529 application circuits. table 1. capacitor vendor information manufacturer web site p hone fax taiyo yuden www.t-yuden.com (408) 573-4150 (408) 573-4159 tdk www.component. tdk.com (847) 803-6100 (847) 803-6296 sanyo www.secc.co.jp (619) 661-6322 (619) 661-1055 avx www.avxcorp.com (803) 448-9411 (803) 448-1943 murata www.murata.com (814) 237-1431 (814) 238-0490 sumida www.sales@ us.sumida.com (408) 321-9660 (408) 321-9308
LTC3529 9 3529fa applications information inductor selection the LTC3529 can utilize small surface-mount chip induc- tors due to its fast 1.5mhz switching frequency. larger values of inductance will allow slightly greater output current capability by reducing the inductor ripple current. increasing the inductance above 10h will increase com- ponent size while providing little improvement in output current capability. usb on-the-go speci? cations limit output capacitance to 6.5f. when using a 6.5f output capacitance, a 4.7h inductor must be used to maintain stability. larger induc- tors may be used with larger output capacitors. the minimum inductance value for a given allowable induc- tor ripple i (in amps peak-to-peak) is given by: l vvv ifv h in min out in min out > () () () ?? ?? where v in(min) is the minimum input voltage, f is the operating frequency in mhz (1.5mhz typ), and v out is the output voltage (5v). the inductor current ripple is typically set for 20% to 40% of the maximum inductor current (i p ). high frequency ferrite core inductor materials reduce frequency depen- dent power losses compared to cheaper powdered iron cores, improving ef? ciency. to achieve high ef? ciency, a low esr inductor should be utilized. the inductor must have a saturation current rating greater than the worst case average inductor current plus half the ripple current. molded chokes and some chip inductors usually do not have enough core to support peak LTC3529 inductor currents. to minimize radiated noise, use a shielded inductor. see table 2 for suggested components and suppliers. table 2. representative surface mount inductors manufacturer part number value (h) max current (a) dcr ( ) height (mm) sumida cdrh5d16np 4.7 2.15 0.064 1.8 tdk vlf5014s 4.7 2 0.098 1.4 coilcraft mss6122 4.7 1.82 0.065 2.2 cooper bussmann sd25-4r7 4.7 2.3 0.043 2.5 pcb layout guidelines the LTC3529 switches large currents at high frequencies. special care should be given to the pcb layout to ensure stable, noise-free operation. figure 1 depicts the recom- mended pcb layout to be utilized for the LTC3529. a few key guidelines follow: 1. all circulating current paths should be kept as short as possible. this can be accomplished by keeping the copper traces to all components in figure 1 short and wide. capacitor ground connections should via down to the ground plane in the shortest route possible. the bypass capacitors on v in and v out should be placed close to the ic and should have the shortest possible paths to ground. 2. the pgnd pin should be shorted directly to the ex- posed pad, as shown in figure 1. this provides a single point connection between the small signal ground and the power ground, as well as a wide trace for power ground. 3. all the external components shown in figure 1 and their connections should be placed over a complete ground plane. 4. use of multiple vias in the die attach pad will enhance the thermal environment of the converter, especially if the vias extend to a ground plane region on the exposed bottom surface or inner layers of the pcb. figure 1. LTC3529 recommended pcb layout 3 4 2 1 6 5 7 8 multiple vias to ground plane v in rst snsgnd fault v out sw shdn pgnd
LTC3529 10 3529fa 20ms/div 3529 ta02b v out 5v/div load current 1a/div fault 2v/div 20ms/div 3529 ta02c v out 5v/div load current 1a/div fault 2v/div typical applications 2 alkaline cells to 5v at 350ma 2 alkaline cells to 5v ef? ciency 3529 ta03a LTC3529 v in sw c in 3.3f 2-cell alkaline 1.8v to 3.2v v out , 5v 270 l1* 4.7h *l1: sumida cdrh5d16np fault snsgnd rst v out shdn pgnd c out 6.8f on off auto-restart on off + li-ion battery to 5v at 100ma or 500ma for usb otg host supply 3529 ta02a LTC3529 v in sw v out , 5v 1.8v 1m l1* 4.7h *l1: sumida cdrh5d16np fault snsgnd rst v out shdn pgnd c out 6.8f on off auto-restart on off 3.3f to p li-ion 2.5v to 4.2v + overcurrent event v rst high overcurrent event v rst low load current (ma) 1 1000 100 10 3529 ta03b v in = 3v v in = 1.8v v in = 3v v in = 1.8v c out = 6.8f inductor = 4.7h, cooper bussmann sd25-4r7 power loss (w) 0.7 0.6 0 0.5 0.4 0.3 0.2 0.1 power loss efficiency efficiency (%) 100 90 80 70 0 10 20 30 60 50 40
LTC3529 11 3529fa 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. dcb package 8-lead plastic dfn (2mm 3mm) (reference ltc dwg # 05-08-1718 rev a) package description 3.00 0.10 (2 sides) 2.00 0.10 (2 sides) note: 1. drawing is not a jedec package outline 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom view?exposed pad 0.75 0.05 r = 0.115 typ r = 0.05 typ 1.35 ref 1 4 8 5 pin 1 bar top mark (see note 6) 0.200 ref 0.00 ? 0.05 (dcb8) dfn 0106 rev a 0.23 0.05 0.45 bsc pin 1 notch r = 0.20 or 0.25 45 chamfer 0.25 0.05 1.35 ref recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 2.10 0.05 0.70 0.05 3.50 0.05 package outline 0.45 bsc 1.35 0.10 1.35 0.05 1.65 0.10 1.65 0.05
LTC3529 12 3529fa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2009 lt 0409 rev a ? printed in usa related parts part number description comments ltc3400/ltc3400b 600ma (i sw ), 1.2mhz, synchronous step-up dc/dc converter 92% ef? ciency, v in : 0.85v to 5v, v out(max) = 5v, i q = 19a/300a, i sd <1a, thinsot? package ltc3401 1a (i sw ), 3mhz, synchronous step-up dc/dc converter 97% ef? ciency, v in : 0.85v to 5v, v out(max) = 5.5v, i q = 38a, i sd <1a, ms10 package ltc3402 2a (i sw ), 3mhz, synchronous step-up dc/dc converter 97% ef? ciency, v in : 0.85v to 5v, v out(max) = 5.5v, i q = 38a, i sd <1a, ms10 package ltc3421 3a (i sw ), 3mhz synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.85v to 4.5v, v out(max) = 5.25v, i q = 12a, i sd <1a, 4mm 4mm qfn-24 package ltc3422 1.5a (i sw ), 3mhz synchronous step-up dc/dc with output disconnect converter 94% ef? ciency, v in : 0.85v to 4.5v, v out(max) = 5.25v, i q = 25a, i sd <1a, 3mm 3mm dfn-10 package ltc3426 2a (i sw ), 1.5mhz, step-up dc/dc converter 92% ef? ciency, v in : 1.6v to 5.5v, v out(max) = 5v, i q = 600a, i sd <1a, thinsot package ltc3427 500ma (i sw ), 1.25mhz synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 1.8v to 5v, v out(max) = 5.25v, i q = 350a, i sd <1a, 2mm 2mm dfn-6 package ltc3429/ltc3429b 600ma (i sw ), 550khz, synchronous step-up dc/dc converter with soft-start/output disconnect 96% ef? ciency, v in : 0.85v to 4.3v, v out(max) = 5v, i q = 20a, i sd <1a, thinsot package ltc3458/ltc3458l 1.4a/1.7a (i sw ), 1.5mhz synchronous step-up dc/dc 94% ef? ciency, v in : 0.85v to 6v, v out(max) = 7.5v/6v, i q = 15a, i sd <1a, 3mm 4mm dfn-12 package ltc3459 80ma (i sw ), synchronous step-up dc/dc converter 92% ef? ciency, v in : 1.5v to 5.5v, v out(max) = 10v, i q = 10a, i sd <1a, thinsot package lt3494/lt3494a 180ma/350ma (i sw ), high ef? ciency step-up dc/dc converter with ouput disconnect 85% ef? ciency, v in : 2.3v to 16v, v out(max) = 38v, i q = 65a, i sd <1a, 2mm 3mm dfn-6, thinsot package ltc3525-3/ ltc3525-3.3/ ltc3525-5 400ma (i sw ), synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.85v to 4v, v out(max) = 3v/3.3v/5v, i q = 7a, i sd <1a, sc-70 package ltc3526/ltc3526l/ ltc3526b 500ma (i sw ), 1mhz synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.85v to 5v, v out(max) = 5.25v, i q = 9a, i sd <1a, 2mm 2mm dfn-6 package ltc3527/ltc3527-1 dual 800ma and 400ma (i sw ), 2.2mhz, synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.7v to 5v, v out(max) = 5.25v, i q = 12a, i sd <1a, 3mm 3mm qfn-16 package ltc3528 1a (i sw ), 1mhz synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.7v to 5v, v out(max) = 5.25v, i q = 12a, i sd <1a, 2mm 3mm dfn-8 package ltc3537 600ma, 2.2mhz, synchronous step-up dc/dc converter with output disconnect and 100ma ldo 94% ef? ciency, v in : 0.7v to 5v, v out(max) = 5.25v, i q = 30a, i sd <1a, 3mm 3mm qfn-16 package ltc3539 2a , 2mhz, synchronous step-up dc/dc converter with output disconnect 94% ef? ciency, v in : 0.7v to 5v, v out(max) = 5.25v, i q = 10a, i sd <1a, 2mm 3mm dfn-8 package thinsot is a trademark of linear technology corporation.

▲Up To Search▲

Price & Availability of LTC3529

	To Download LTC3529 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .