View LTC4440-15_8251814.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 typical application synchronous phase-modulated full-bridge converter ltc4440 driving a 1000pf capacitive load v cc inp gnd boost tg ts ltc4440 v in 36v to 72v 100v peak transient (abs max) v cc 8v to 15v v cc inp gnd boost tg ts ltc4440 v cc ltc3722-1 ? ? 4440 ta01 10ns/div input (inp) 2v/div output (tg ? ts) 5v/div 4440 f02 features description high speed, high voltage high side gate driver the lt c ? 4440 is a high frequency high side n-channel mosfet gate driver that is designed to operate in ap- plications with v in voltages up to 80 v. the ltc4440 can also withstand and continue to function during 100 v v in transients. the powerful driver capability reduces switch- ing losses in mosfets with high gate capacitances. the ltc4440s pull-up has a peak output current of 2.4 a and its pull-down has an output impedance of 1.5. the ltc4440 features supply independent ttl /cmos compatible input thresholds with 350 mv of hysteresis. the input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 115v above ground. the ltc4440 contains both high side and low side under - voltage lockout circuits that disable the external mosfet when activated. the ltc4440 is available in the low profile (1 mm) sot-23 and thermally enhanced 8-lead msop packages. parameter ltc4440 ltc4440-5 ltc4440a-5 max operating ts 80v 60v 80v absolute max ts 100v 80v 100v mosfet gate drive 8v to 15v 4v to 15v 4v to 15v v cc uv + 6.3v 3.2v 3.2v v cc uv C 6.0v 3.04v 3.04v applications n wide operating v in range: up to 80v n rugged architecture tolerant of 100v v in transients n powerful 1.5 driver pull-down n powerful 2.4a peak current driver pull-up n 7ns fall time driving 1000pf load n 10ns rise time driving 1000pf load n drives standard threshold mosfets n ttl/cmos compatible inputs with hysteresis n input thresholds are independent of supply n undervoltage lockout n low profile (1mm) sot-23 (thinsot)? and thermally enhanced 8-pin msop packages n telecommunications power systems n distributed power architectures n server power supplies n high density power modules l, lt , lt c , lt m , linear technology and the linear logo are registered trademarks and thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. protected by u.s. patents, including 6677210. ltc4440 4440fb for more information www.linear.com/ltc4440
2 absolute maximum ratings (note 1) supply voltage v cc ........................................................ C 0.3 v to 15 v boos t C ts ........................................... C 0.3 v to 15 v inp voltage ................................................ C 0.3 v to 15 v boost voltage ( continuous ) ..................... C0. 3 v to 95 v boost voltage (100 ms ) ........................... C 0.3 v to 115 v ts voltage ( continuous ) ............................... C5 v to 80 v ts voltage (100 ms ) .................................... C5 v to 100 v peak output current < 1 s ( tg ) ................................. 4 a driver output tg ( with respect to ts ) ....... C 0.3 v to 15 v operating temperature range ( note 2) ltc 444 0 e ........................................... C 40 c to 85 c ltc 444 0 i .......................................... C 40 c to 125 c junction temperature ( note 3) ............................ 12 5 c storage temperature range .................. C 65 c to 150 c lead temperature ( soldering , 10 sec ) ................... 30 0 c 1 2 3 4 inp gnd v cc gnd 8 7 6 5 ts tg boost nc top view 9 ms8e package 8-lead plastic msop t jmax = 125c, ja = 40c/w (note 4) exposed pad ( pin 9) is gnd, must be soldered to pcb v cc 1 gnd 2 inp 3 6 boost 5 tg 4 ts top view s6 package 6-lead plastic sot-23 t jmax = 125c, ja = 230c/w pin configuration order information lead free finish tape and reel part marking package description temperature range ltc4440ems8e#pbf ltc4440ems8e#trpbf lt f 9 8-lead plastic msop C40c to 85c ltc4440ims8e#pbf ltc4440ims8e#trpbf lt f 9 8-lead plastic msop C40c to 125c ltc4440es6#pbf ltc4440es6#trpbf ltzy 6-lead plastic sot-23 C40c to 85c ltc4440is6#pbf ltc4440is6#trpbf ltzy 6-lead plastic sot-23 C40c to 125c consult lt c marketing for parts specified with wider operating temperature ranges. consult lt c marketing for information on nonstandard lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ltc4440 4440fb for more information www.linear.com/ltc4440
3 electrical characteristics symbol parameter conditions min typ max units main supply (v cc ) i vcc dc supply current normal operation uvlo inp = 0v v cc < uvlo threshold (falling) C 0.1v 250 25 400 80 a a uvlo undervoltage lockout threshold v cc rising v cc falling hysteresis l l 5.7 5.4 6.5 6.2 300 7.3 7.0 v v mv bootstrapped supply (boost C ts) i boost dc supply current normal operation uvlo inp = 0v v boost C v ts < uvlo hs(falling) C 0.1v, v cc = inp = 5v 110 86 180 170 a a uvlo hs undervoltage lockout threshold v boost C v ts rising v boost C v ts falling hysteresis l l 6.75 6.25 7.4 6.9 500 7.95 7.60 v v mv input signal (inp) v ih high input threshold inp ramping high l 1.3 1.6 2 v v il low input threshold inp ramping low l 0.85 1.25 1.6 v v ih C v il input voltage hysteresis 0.350 v i inp input pin bias current 0.01 2 a output gate driver (tg) v oh high output voltage i tg = C10ma, v oh = v boost C v tg 0.7 v v ol low output voltage i tg = 100ma: 0c t a 85c C40c t a 125c l l 150 150 220 300 mv mv i pu peak pull-up current 0c t a 85c C40c t a 125c l l 1.7 1.5 2.4 2.4 a a r ds output pull-down resistance 0c t a 85c C40c t a 125c l l 1.5 1.5 2.2 3 switching t iming t r output rise time 10% C 90%, c l = 1nf 10% C 90%, c l = 10nf 10 100 ns ns t f output fall time 10% C 90%, c l = 1nf 10% C 90%, c l = 10nf 7 70 ns ns t plh output low-high propagation delay 0c t a 85c C40c t a 125c l l 30 30 65 75 ns ns t phl output high-low propagation delay 0c t a 85c C40c t a 125c l l 28 28 65 75 ns ns the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v cc = v boost = 12v, v ts = gnd = 0v, unless otherwise noted. note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the ltc4440e is guaranteed to meet performance specifications from 0c to 70c. specifications over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. the ltc4440i is guaranteed and tested over the C40c to 125c operating temperature range. note 3: t j is calculated from the ambient temperature t a and power dissipation pd according to the following formula: t j = t a + (pd ? ja c/w) note 4: failure to solder the exposed back side of the ms8e package to the pc board will result in a thermal resistance much higher than 40c/w. ltc4440 4440fb for more information www.linear.com/ltc4440
4 typical performance characteristics v cc supply quiescent current vs voltage boost C ts supply quiescent current vs voltage output low voltage (v ol ) vs supply voltage v cc supply voltage (v) 0 0 quiescent current (a) 50 100 150 200 300 5 10 4440 g01 15 250 inp = v cc inp = 0v t a = 25c boost ? ts supply voltage (v) 0 0 quiescent current (a) 100 150 200 250 300 350 5 10 4440 g02 400 450 inp = 0v 500 50 15 inp = v cc t a = 25c boost ? ts supply voltage (v) 8 output (tg ? ts) voltage (mv) 150 155 160 165 170 11 13 4440 g03 145 140 9 10 12 14 15 i tg = 100ma t a = 25c 2mhz operation v cc supply current (v cc = 12v) vs temperature v cc undervoltage lockout thresholds vs temperature output high voltage (v oh ) vs supply voltage input thresholds (inp) vs supply voltage v cc supply current at ttl input levels boost ? ts supply voltage (v) 8 output voltage (tg ?ts) (v) 14 11 4440 g04 11 9 9 10 12 8 7 15 13 12 10 13 14 15 i tg = ?100ma i tg = ?1ma i tg = ?10ma t a = 25c v cc supply voltage (v) 7 0.8 input threshold (v) 1.0 1.2 1.4 1.6 1.8 2.0 9 11 13 15 4440 g05 v il (input low threshold) v ih (input high threshold) t a = 25c temperature (c) ?60 current (a) 200 250 300 12090 4440 g08 150 100 0 ?30 300 60 50 inp = 0v inp = 12v v cc supply voltage (v) 8 v cc supply quiescent current (a) 300 320 340 4440 g06 280 260 200 10 12 14 240 220 380 inp = 2v inp = 0.8v 360 t a = 25c temperature (c) ?60 v cc supply voltage (v) 6.45 6.40 6.55 6.50 6.35 6.30 6.25 6.20 6.15 12090 4440 g09 ?30 300 60 falling threshold rising threshold 250ns/div v cc = 12v input (inp) 5v/div output (tg) 5v/div 4440 g07 ltc4440 4440fb for more information www.linear.com/ltc4440
5 boost supply current vs temperature boost supply (boost C ts) undervoltage lockout thresholds vs temperature input threshold vs temperature temperature (c) ?60 current (a) 500 400 450 350 300 250 200 150 100 50 12090 4440 g10 0 ?30 300 60 inp = 0v inp = 12v temperature (c) ?60 boost ? ts supply voltage (v) 7.6 7.5 7.4 7.3 7.2 7.1 7.0 6.9 6.8 12090 4440 g11 6.7 ?30 300 60 falling threshold rising threshold temperature (c) ?60 input threshold (v) 1.6 1.8 2.0 12090 4440 g12 1.4 1.2 0.8 ?30 300 60 1.0 v ih (v cc = 15v) v il (v cc = 15v) v ih (v cc = 8v) v il (v cc = 8v) v ih (v cc = 12v) v il (v cc = 12v) typical performance characteristics output driver pull-down resistance vs temperature propagation delay vs temperature (v cc = boost = 12v) input threshold hysteresis vs temperature peak driver (tg) pull-up current vs temperature temperature (c) ?60 hysteresis (mv) 500 460 480 440 420 400 380 360 340 320 12090 4440 g13 300 ?30 300 60 v ih -v il (v cc = 12v) v ih -v il (v cc = 15v) v ih -v il (v cc = 8v) temperature (c) ?60 peak current (a) 3.0 2.8 2.9 2.7 2.6 2.5 2.4 2.3 2.2 2.1 12090 4440 g14 2.0 ?30 300 60 boost ? ts = 12v boost ? ts = 15v temperature (c) ?60 r ds () 2.0 2.5 3.0 12090 4440 g15 1.5 1.0 0 ?30 300 60 0.5 boost ? ts = 15v boost ? ts = 8v boost ? ts = 12v temperature (c) ?60 propagation delay (ns) 45 40 35 30 25 20 15 10 5 12090 4440 g16 0 ?30 300 60 t plh t phl ltc4440 4440fb for more information www.linear.com/ltc4440
6 pin functions v cc ( pin 1): chip supply. this pin powers the internal low side circuitry. a low esr ceramic bypass capacitor should be tied between this pin and the gnd pin (pin 2). gnd (pin 2): chip ground. inp (pin 3): input signal. ttl /cmos compatible input referenced to gnd (pin 2). ts (pin 4): top (high side) source connection. tg (pin 5): high current gate driver output ( top gate). this pin swings between ts and boost. boost ( pin 6): high side bootstrapped supply. an external capacitor should be tied between this pin and ts ( pin? 4). normally, a bootstrap diode is connected between v cc ( pin?1) and this pin. voltage swing at this pin is from v cc C v d to v in + v cc C v d , where v d is the forward voltage drop of the bootstrap diode. sot-23 package inp (pin 1): input signal. ttl /cmos compatible input referenced to gnd (pin 2). gnd (pins 2, 4): chip ground. v cc ( pin 3): chip supply. this pin powers the internal low side circuitry. a low esr ceramic bypass capacitor should be tied between this pin and the gnd pin (pin 2). nc (pin 5): no connect. no connection required. for convenience, this pin may be tied to pin 6 ( boost) on the application board . b o ost ( pin 6): high side bootstrapped supply. an external capacitor should be tied between this pin and ts ( pin?8). normally, a bootstrap diode is connected between v cc (pin?3) and this pin. voltage swing at this pin is from v cc C v d to v in + v cc C v d , where v d is the forward voltage drop of the bootstrap diode. tg (pin 7): high current gate driver output ( top gate). this pin swings between ts and boost. ts (pin 8): top (high side) source connection. exposed pad (pin 9): ground. must be electrically con - nected to pins 2 and 4 and soldered to pcb ground for optimum thermal per formance. exposed pad ms8e package ltc4440 4440fb for more information www.linear.com/ltc4440
7 block diagram timing diagram boost ts gnd tg boost 4440 bd v in up to 80v, transient up to 100v ts high side undervoltage lockout undervoltage lockout level shifter v cc 8v to 15v gnd inp v ih 90% 10% t r input (inp) output (tg) input rise/fall time < 10ns v il t f t plh 4440 td t phl ltc4440 4440fb for more information www.linear.com/ltc4440
8 applications information figure 3. capacitance seen by tg during switching overview the ltc4440 receives a ground-referenced, low voltage digital input signal to drive a high side n-channel power mosfet whose drain can float up to 100 v above ground, eliminating the need for a transformer between the low voltage control signal and the high side gate driver. the ltc4440 normally operates in applications with input supply voltages (v in ) up to 80 v, but is able to withstand and continue to function during 100v, 100 ms transients on the input supply. the powerful output driver of the ltc4440 reduces the switching losses of the power mosfet, which increase with transition time. the ltc4440 is capable of driving a 1nf load with 10 ns rise and 7 ns fall times using a boot - strapped supply voltage v boostCts of 12v. input stage the ltc4440 employs ttl / cmos compatible input thresh - olds that allow a low voltage digital signal to drive standard power mosfets. the ltc4440 contains an internal voltage regulator that biases the input buffer, allowing the input thresholds (v ih = 1.6 v, v il = 1.25 v) to be independent of variations in v cc . the 350 mv hysteresis between v ih and v il eliminates false triggering due to noise during switching transitions. however, care should be taken to keep this pin from any noise pickup, especially in high frequency, high voltage applications. the ltc4440 input buffer has a high input impedance and draws negligible input current, simplifying the drive circuitry required for the input. output stage a simplified version of the ltc4440s output stage is shown in figure 3 . the pull-down device is an n-channel mosfet ( n1) and the pull-up device is an npn bipolar junction transistor ( q1). the output swings from the lower rail ( ts) to within an npn v be ( ~ 0.7v) of the positive rail (boost). this large voltage swing is important in driv- ing external power mosfets, whose r ds(on) is inversely proportional to its gate overdrive voltage (v gs C v th ). the ltc4440s peak pull-up ( q1) current is 2.4 a while the pull-down ( n1) resistance is 1.5. the low impedance of n1 is required to discharge the power mosfets gate capacitance during high - to - low signal transitions. when the power mosfet s gate is pulled low (gate shorted to source through n1) by the ltc4440, its source ( ts) is pulled low by its load (e.g., an inductor or resistor). the slew rate of the source/gate voltage causes current to flow back to the mosfets gate through the gate-to-drain capacitance (c gd ). if the mosfet driver does not have sufficient sink current capability ( low output impedance), the current through the power mosfets c gd can momentarily pull the gate high, turning the mosfet back on. a similar scenario exists when the ltc4440 is used to drive a low side mosfet. when the low side power mosfets gate is pulled low by the ltc4440, its drain voltage is pulled high by its load ( e.g., inductor or resistor). the slew rate of the drain voltage causes current to flow back to the mosfets gate through its gate-to-drain capacitance. if boost v in up to 100v ts v ? tg c gd power mosfet load inductor c gs 4440 f03 ltc4440 q1 n1 ltc4440 4440fb for more information www.linear.com/ltc4440
9 the mosfet driver does not have sufficient sink current capability ( low output impedance), the current through the power mosfets c gd can momentarily pull the gate high, turning the mosfet back on. rise/fall time since the power mosfet generally accounts for the ma - jority of the power loss in a converter, it is important to quickly turn it on or off, thereby minimizing the transition time in its linear region. the ltc4440 can drive a 1 nf load with a 10ns rise time and 7ns fall time. the ltc4440s rise and fall times are determined by the peak current capabilities of q1 and n1. the predriver that drives q 1 and n 1 uses a nonoverlapping transition scheme to minimize cross-conduction currents. n1 is fully turned off before q1 is turned on and vice versa. power dissipation to ensure proper operation and long- term reliability, the ltc4440 must not operate beyond its maximum temperature rating. package junction temperature can be calculated by: t j = t a + pd ( ja ) where: t j = junction temperature t a = ambient temperature pd = power dissipation ja = junction-to-ambient thermal resistance power dissipation consists of standby and switching power losses: pd = p stdby + p ac where: p stdby = standby power losses p ac = ac switching losses the ltc4440 consumes very little current during standby. the dc power loss at v cc = 12 v and v boostCts = 12 v is only (250a + 110a)(12v) = 4.32mw. ac switching losses are made up of the output capacitive load losses and the transition state losses. the capacitive load losses are primarily due to the large ac currents needed to charge and discharge the load capacitance dur - ing switching. load losses for the output driver driving a pure capacitive load c out would be: load capacitive power = (c out )(f)(v boostCts ) 2 the power mosfets gate capacitance seen by the driver output varies with its v gs voltage level during switching. a power mosfets capacitive load power dissipation can be calculated using its gate charge, q g . the q g value corresponding to the mosfets v gs value (v cc in this case) can be readily obtained from the manufacturers q g vs v gs curves: load capacitive power (mos) = (v boostCts )(q g )(f) transition state power losses are due to both ac currents required to charge and discharge the drivers internal nodal capacitances and cross-conduction currents in the internal gates. applications information ltc4440 4440fb for more information www.linear.com/ltc4440
10 applications information undervoltage lockout (uvlo) the ltc4440 contains both low side and high side un- dervoltage lockout detectors that monitor v cc and the bootstrapped supply v boostCts . when v cc falls below 6.2v, the internal buffer is disabled and the output pin out is pulled down to ts. when v boost C ts falls below 6.9v, out is pulled down to ts. when both supplies are undervoltage, out is pulled low to ts and the chip enters a low current mode, drawing approximately 25 a from v cc and 86a from boost. bypassing and grounding the ltc4440 requires proper bypassing on the v cc and v boostCts supplies due to its high speed switching ( nanoseconds) and large ac currents ( amperes). careless component placement and pcb trace routing may cause excessive ringing and under/overshoot. to obtain the optimum performance from the ltc4440: a. mount the bypass capacitors as close as possible between the v cc and gnd pins and the boost and ts pins. the leads should be shortened as much as possible to reduce lead inductance. b. use a low inductance, low impedance ground plane to reduce any ground drop and stray capacitance. re - member that the ltc4440 switches >2a peak currents and any significant ground drop will degrade signal integrity. c. plan the power/ground routing carefully. know where the large load switching current is coming from and going to. maintain separate ground return paths for the input pin and the output power stage. d. keep the copper trace between the driver output pin and the load short and wide. e. when using the ms8e package, be sure to solder the exposed pad on the back side of the ltc4440 package to the board. correctly soldered to a 2500mm 2 double- sided 1 oz copper board, the ltc4440 has a thermal resistance of approximately 40 c/w. failure to make good thermal contact between the exposed back side and the copper board will result in thermal resistances far greater than 40c/w. ltc4440 4440fb for more information www.linear.com/ltc4440
11 typical applications 18 10 911 12v v in 12 ltc3722egn-1 pdly outf oute compss pgndgnd cs v in sbus uvlo 1f adly 330pf mmbt3904 2.2nf 100k d12 5.1v t3 1(1.5mh):0.5 t1 5(105h):1:1 t2 5:5(105h):1:1 2.49k 9.53k 10k 2.7k 470 1/4w l4 1mh c3 68f 20v v h ? ? 16 15 8 1 9 5 4 150 0.02 1.5w 30.1k 220pf 100 330 1.10k 909 4.87k 1/4w 4.87k 1/4w 51 2w 220pf 182k 20k 1/4w 220pf 4.99k 20k 180pf 68nf 220pf 0.47f 150k sync pv cc cse + ltc3901egn cse ? 8 6 5 1 4 10 13 7 1f 1f 4440 ta03 ?v out v out ?v out d10 10v v out me me2 gnd pgnd gnd2 pgnd2 timer v cc 330pf 2 3 1.10k 909 39.2k 100 1k csf + ?v out v out v out ?v out v out 12v/35a ?v out csf ? 11 12 mf mf2 14 15 16 22nf si7852dp 4 si7852dp 4 si7852dp 2 l1 1.3h 11 4 2 12v d7 d8 4 2 1 6 ? ???? ?? ? 10 8 7 + 1 0.22f si7852dp 2 3 6 7 824 a d2 ltc4440ems8e boost inp tg tsgndgnd v cc 12v 1 0.22f si7852dp 2 3 6 7 8 12vd 24 c d3 d4 d5 51 2w 0.47f 100v ltc4440ems8e boost inp tg tsgndgnd v cc 12v 1f 100v 4 v in v in ?v in 36v to 72v 1f 100v 17 d outd 19 10 10 c outc 20 b outb 21 a outa c1, c2 180f 16v 2 + 1f 0.47f, 100v tdk c3216x7r2a474m 1f, 100v tdk c4532x7r2a105m c1,c2: sanyo 16sp180m c3: avx tpse686m020r0150 c4: murata de2e3kh222mb3b d1, d4-d6: murs120t3 d2, d3, d7, d8: bas21 d9: mmbz5226b d10: mmbz5240b d11: bat54 d12: mmbz231b l1: sumida cdep105-1r3mc-50 l2: pulse pa0651 l3: pa1294.910 l4: coilcraft do1608c-105 q1, q2: zetex fmmt619 q3, q4: zetex fmmt718 t1, t2: pulse pa0526 t3: pulse pa0785 6 3 4 22236 33k 5 7 d11 8.25k i sns 5v ref i sns 0.1f 5 8 1 2 1 moc207 c4 2.2nf 250v 0.047f 3 6 5 8 gnd-f v + gnd-s coll ref lt1431cs8 1.1k 22 200k 750 100 d9 3.3v 0.02 1.5w v h d1 d6 13k 1/2w 0.47f 100v 820pf 200v l3 0.85h 15 1w 0.47f 100v si7852dp 2 12vb q1 q3 q2 q4 11 10 8 7 mmbt3904 fb sprg r leb 10k 13 sync 5.1k 1 nc 8 dprg 2 v ref 5v ref 14 c t 24 l2 150nh ? ltc3722/ltc4440 420w 36v-72v in to 12v/35a isolated full-bridge supply ltc4440 4440fb for more information www.linear.com/ltc4440
12 typical applications ltc3723-1 240w 42-56v in to 12v/20a isolated 1/4brick (2.3" 1.45") 5 46 a b 12v v in 15 ltc3723egn-1 drvb sdrb sdra comp cs v cc uvlo 9 150k 1 0.47f 1f drva dprg v ref sprg gnd ss fb c t 330pf 22nf 100k d8 10v 68nf 270pf t2 1(1.5mh):0.5 t1 4t:6t(65hmin):6t:2t:2t 243k 2.49k 9.53k 10k 750 1k 100 1/4w 813 3 si7370dp 2 l4 1mh c3 68f 20v v f d2 ? ? 3 2 8 1 9 5 4 16 10k 33k 200 1/4w r1 0.03 1.5w 66.5k rleb 12 7 14 220pf 22nf 100 665 1k 866 6.19k 1/4w 1.5nf 464k 30k 1/4w sync pv cc csf + v f ltc3901egn csf ? 8 11 12 1 4 10 13 7 22nf 1f 4.7f 4440 ta05 ?v out v out ?v out d7 10v v out mf mf2 gnd pgnd gnd2 pgnd2 timer v cc 470pf 14 15 1k 866 42.2k 1k 100 6.19k 1/4w cse + v e ?v out v out v f v out 12v/20a ?v out cse ? 6 5 me me2 2 3 16 si7370dp 2 si7852dp si7852dp l5 0.56h 11 2 4 12v d5 d6 3 5 1 6 ? ? ? ? ? 9 7 v e + 0.1f si7852dp 1 6 5 4 b 2 a d3 ltc4440es6 boost inp tg tsgnd v cc 12v 3 0.1f si7852dp 1 6 5 42 b d4 ltc4440es6 boost inp tg tsgnd v cc 12v 1f 100v 3 v in v in ?v in 42v to 56v 1f 100v c1, c2 47f 16v 2 + 1f 1f 100v 1k 1/4w 1f, 100v tdk c3225x7r2a105m c1,c2: sanyo 16tqc47m c3: avx tpse686m020r0150 c4: murata ghm3045x7r222k-gc d2: diodes inc. es1b d3-d6: bas21 d7, d8: mmbz5240b l4: coilcraft do1608c-105 l5: coilcraft do1813p-561hc l6: pulse pa1294.132 or panasonic etqp1h1r0bfa r1, r2: irc lrc2512-r03g t1: pulse pa0805.004 t2: pulse pa0785 6 10 i sns i sns 0.1f 11 5 8 1 2 1 moc207 c4 2.2nf 250v 0.1f 3 6 5 8 gnd-f v + gnd-s coll ref lt1431cs8 a 1.5k 22 4.7 4.7 r2 0.03 1.5w v e 470pf 100v l6 1.25h 10 1w 6 93 efficiency (%) 94 95 96 97 8 10 12 load current (a) 14 16 18 20 42v in 48v in 56v in mmbt3904 ? ltc4440 4440fb for more information www.linear.com/ltc4440
13 package description msop (ms8e) 0213 rev k 0.53 0.152 (.021 .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 6. exposed pad dimension does include mold flash. mold flash on e-pad shall not exceed 0.254mm (.010") per side. 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 ? 0.38 (.009 ? .015) typ 0.86 (.034) ref 0.65 (.0256) bsc 0 ? 6 typ detail ?a? detail ?a? gauge plane 1 2 3 4 4.90 0.152 (.193 .006) 8 8 1 bottom view of exposed pad option 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 1.68 (.066) 1.88 (.074) 5.10 (.201) min 3.20 ? 3.45 (.126 ? .136) 1.68 0.102 (.066 .004) 1.88 0.102 (.074 .004) 0.889 0.127 (.035 .005) recommended solder pad layout 0.65 (.0256) bsc 0.42 0.038 (.0165 .0015) typ 0.1016 0.0508 (.004 .002) detail ?b? detail ?b? corner tail is part of the leadframe feature. for reference only no measurement purpose 0.05 ref 0.29 ref ms8e package 8-lead plastic msop, exposed die pad (reference ltc dwg # 05-08-1662 rev k) ltc4440 4440fb for more information www.linear.com/ltc4440
14 package description 1.50 ? 1.75 (note 4) 2.80 bsc 0.30 ? 0.45 6 plcs (note 3) datum ?a? 0.09 ? 0.20 (note 3) s6 tsot-23 0302 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 ? 0.90 1.00 max 0.01 ? 0.10 0.20 bsc 0.30 ? 0.50 ref pin one id note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.62 max 0.95 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636) ltc4440 4440fb for more information www.linear.com/ltc4440
15 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. revision history rev date description page number a 1013 added comparison table 1 b 0215 released i-grade version 2, 3 ltc4440 4440fb for more information www.linear.com/ltc4440
16 ? linear technology corporation 2003 lt 0215 rev b ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/ltc4440 related parts typical application ltc3723-2/ltc4440/ltc3901 240w 42v-56v in to unregulated 12v half-bridge converter 5 46 a b 11v 12vv in mmbt3904 15 ltc3723egn-2 drvb sdrb sdra comp v cc uvlo 12 62k 330pf 12v mmbz5242b 150pf 1 0.47f 1f drva dprg v ref ramp sprg gnd sscs fb c t 470pf 0.47f 4.7k 0.22f 2n7002 b cs + t3 1(1.5mh):0.5 t1 5:4:4:2:2 1f 89 13 1k 22 0.1f c1 2.2nf 250v 1f 100v 1f 100v 1f 100v 1f 100v 0.22f si7370dp 2 si7852dp 2 1 6 5 42 3 a si7370dp 2 1500pf 100v l2 0.22h l3 1mh c3 68f v f ? ? 11 3 2 8 1 9 5 4 16 10k 120 30.1k 7 10 14 7.5 d4 d5 7.5 220pf 100 10k 3k 4.7k 1/4w 100pf 215k 15k 1/4w sync pv cc csf + v f ltc3901egn csf ? 8 11 12 1 4 10 13 7 1f 1f 4440 ta04 ?v out 10v mmbz5240b 1k v out mf mf2 gnd pgnd gnd2 pgnd2 timer v cc 330pf 14 15 10k 3k 33.2k 100 4.7k 1/4w cse + v e 20 1w ?v out v out v out ?v out cse ? 6 5 me me2 2 3 16 mmbt3904 si7852dp 2 l1 0.56h 72 4 cs + t2 70(980h):1 8 7 1 3 12v d2 d1 d3 3 5 1 6 ? ? ? ? ? ? ? 9 11 v e + ltc4440es6 boost inp tg tsgnd v cc 11v 1f 100v v in v in ?v in 48v in 1f 100v c2 180f 16v + 1f 1f, 100v tdk c4532x7r2a105m c1: murata de2e3kh222mb3b c2: sanyo 16sp180m c3: avx tpse686m020r0150 d1-d3: bas21 d4, d5: mmbd914 l1: coilcraft do1813p-561hc l2: sumida cdep105-0r2nc-50 l3: coilcraft do1608c-105 t1: pulse pa0801.005 t2: pulse p8207 t3: pulse pa0785 part number description comments lt c 4441 6a n-channel mosfet gate driver up to 25v supply voltage, adjustable gate drive voltage from 5v to 8v lt 1910 protected high side mosfet driver up to 48v/60v surge supply voltage, adjustable current limit lt c 4442 high speed synchronous n-channel mosfet driver up to 38v supply voltage, 6v v cc 9.5v lt c 4449 high speed synchronous n-channel mosfet driver up to 38v supply voltage, 4.5v v cc 6.5v lt c 4444/ lt c 4444-5 high voltage synchronous n-channel mosfet driver with shoot-through protection up to 100v supply voltage, 4.5v/7.2v v cc 13.5v, 3a peak pull- up/0.55? peak pull-down lt c 4446 high voltage synchronous n-channel mosfet driver without shoot-through protection up to 100v supply voltage, 7.2v v cc 13.5v, 3a peak pull-up/0.55? peak pull-down lt c 1154 high side micropower mosfet driver up to 18v supply voltage, 85a quiescent current, internal charge pump lt c 1155 dual high side micropower mosfet driver up to 18v supply voltage, 85a quiescent current, internal charge pump lt c 3900 synchronous rectifier driver for forward converters pulse transformer synchronous input lt c 3901 synchronous rectifier driver for push-pull and full- bridge converters pulse transformer synchronous input lt c 3722-1/ lt c 3722-2 synchronous phase modulated full-bridge controllers adjustable synchronous rectification timing for highest efficiency lt c 3723-1/ lt c 3723-2 synchronous push-pull and full-bridge controllers high efficiency with on-chip mosfet drivers ltc4440 4440fb for more information www.linear.com/ltc4440

▲Up To Search▲

Price & Availability of LTC4440-15

	To Download LTC4440-15 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .