electrical specifications subject to change ltm4603/LTM4603-1 1 4603p 6a dc/dc module with pll, output tracking and margining telecom and networking equipment servers industrial equipment point of load regulation complete switch mode power supply wide input voltage range: 4.5v to 20v 6a dc typical, 8a peak output current 0.6v to 5v output voltage output voltage tracking and margining remote sensing for precision regulation (ltm4603 only) typical operating frequency: 1mhz pll frequency synchronization 1.5% regulation current foldback protection (disabled at start-up) pin compatible with the ltm4601 pb-free (e4) rohs compliant package with gold finish pads ultrafast transient response current mode control up to 93% ef? ciency at 5v in , 3.3v out programmable soft-start output overvoltage protection small footprint, low pro? le (15mm 15mm 2.8mm) surface mount lga package 1.5v/6a power supply with 4.5v to 20v input applicatio s u features descriptio u typical applicatio u ef? ciency vs load current with 12v in the ltm ? 4603 is a complete 6a step-down switch mode dc/dc power supply with onboard switching controller, mosfets, inductor and all support components. the module tm is housed in a small surface mount 15mm 15mm 2.8mm lga package. operating over an input voltage range of 4.5 to 20v, the ltm4603 supports an output voltage range of 0.6v to 5v as well as output voltage tracking and margining. the high ef? ciency design deliv- ers 6a continuous current (8a peak). only bulk input and output capacitors are needed to complete the design. the low pro? le (2.8mm) and light weight (1.73g) package easily mounts on the unused space on the back side of pc boards for high density point of load regulation. the module can be synchronized with an external clock for reducing undesirable frequency harmonics and allows polyphase ? operation for high load currents. a high switching frequency and adaptive on-time current mode architecture deliver a very fast transient response to line and load changes without sacri? cing stability. an onboard remote sense ampli? er can be used to accurately regulate an output voltage independent of load current. the onboard remote sense ampli? er is not available in the LTM4603-1. the ltm4603/LTM4603-1 are pin compatible with the 12a ltm4601/ltm4601-1. , lt, ltc, ltm and polyphase are registered trademarks of linear technology corporation. module is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. v out v fb marg0 marg1 v out_lcl diffv out v osns + v osns ? pgood run comp intv cc drv cc mpgm track/ss pllin ltm4603 on/off 392k 40.2k margin control c out 4603 ta01a v out 1.5v 6a clock sync track/ss control 100pf c in v in f set pgnd sgnd 5% margin v in 4.5v to 20v output current (a) 0 efficiency (%) 0.60 0.90 0.95 1.00 2 4 5 4603 ta01b 0.50 0.45 0.80 0.70 0.55 0.85 0.40 0.75 0.65 1 3 6 7 12v in , 1.2v out 12v in , 1.5v out 12v in , 1.8v out 12v in , 2.5v out 12v in , 3.3v out 12v in , 5v out
ltm4603/LTM4603-1 2 4603p intv cc , drv cc , v out_lcl , v out (v out 3.3v with remote sense amp) ............................ C0.3v to 6v pllin, track/ss, mpgm, marg0, marg1, pgood, f set .............................. C0.3v to intv cc + 0.3v run ............................................................. C0.3v to 5v v fb , comp ................................................ C0.3v to 2.7v v in ............................................................. C0.3v to 20v v osns + , v osns C .................................. 0v to intv cc C 1v operating temperature range (note 2) ... C40c to 85c junction temperature ........................................... 125c storage temperature range ................... C55c to 125c (note 1) the denotes the speci? cations which apply over the C40c to 85c temperature range, otherwise speci? cations are at t a = 25c, v in = 12v. per typical application (front page) con? guration. electrical characteristics absolute axi u rati gs w ww u package/order i for atio uu w symbol parameter conditions min typ max units v in(dc) input dc voltage 4.5 20 v v out(dc) output voltage c in = 10f 2, c out = 2 , 100f/x5r/ ceramic v in = 12v, v out = 1.5v, i out = 0a v in = 12v, v out = 1.5v, i out = 6a 1.478 1.5 1.522 v input speci? cations v in(uvlo) undervoltage lockout threshold i out = 0a 3.2 4 v i inrush(vin) input inrush current at startup i out = 0a. v out = 1.5v v in = 5v v in = 12v 0.6 0.7 a a i q(vin) input supply bias current v in = 12v, v out = 1.5v, no switching v in = 12v, v out = 1.5v, switching continuous v in = 5v, v out = 1.5v, no switching v in = 5v, v out = 1.5v, switching continuous shutdown, run = 0, vin = 12v 2.5 41.8 52.9 35 ma ma ma a marg1 drv cc v fb pgood sgnd v osns + /nc2* diffv out /nc3* v out_lcl v osns ? /nc1* v in pgnd v out f set marg0 run comp mpgm pllin intv cc track/ss lga package 118-lead (15mm 15mm 2.8mm) top view t jmax = 125c, ja = 15c/w, jc = 6c/w, ja derived from 95mm 76mm pcb with 4 layers, weight = 1.7g *LTM4603-1 only order part number lga part marking ltm4603ev#pbf ltm4603iv#pbf ltm4603ev-1#pbf ltm4603iv-1#pbf ltm4603v ltm4603v ltm4603v-1 ltm4603v-1 consult ltc marketing for parts speci? ed with wider operating temperature ranges.
ltm4603/LTM4603-1 3 4603p symbol parameter conditions min typ max units i s(vin) input supply current v in = 12v, v out = 1.5v, i out = 6a v in = 12v, v out = 3.3v, i out = 6a v in = 5v, v out = 1.5v, i out = 6a 0.85 1.78 2.034 a a a intv cc v in = 12v, run > 2v no load 4.7 5 5.3 v output speci? cations i outdc output continuous current range (see output current derating curves for different v in , v out and t a ) v in = 12v, v out = 1.5v 0 6 a v out(nom) C v out( line) v out(nom) line regulation accuracy v out = 1.5v, i out = 0a, v in = 4.5v to 20v, i out = 0a to 6a 0.3 % v out(nom) C v out( load) v out(nom) load regulation accuracy v out = 1.5v v in = 5v v in = 12v 1 1 % % v out(ac) output ripple voltage i out = 0a, c out = 2 , 100f/x5r/ceramic v in = 12v, v out = 1.5v v in = 5v, v out = 1.5v 20 18 mv p-p mv p-p f s output ripple voltage frequency i out = 3a, v in = 12v, v out = 1.5v 1000 khz v out(start) turn-on overshoot, track/ss = 10nf c out = 2 , 100f/x5r/ceramic, v out = 1.5v, i out = 0a v in = 12v v in = 5v 20 20 mv mv t start turn-on time, track/ss = open c out = 2 , 100f/x5r/ceramic, v out = 1.5v, i out = 6a resisitive load v in = 12v v in = 5v 0.5 0.7 ms ms v outls peak deviation for dynamic load load: 0% to 50% to 0% of full load, c out = 2 22f/ceramic, 470f, 4v sanyo poscap v in = 12v v in = 5v 35 35 mv mv t settle settling time for dynamic load step load: 0% to 50% to 10% of full load v in = 12v 25 s i outpk output current limit c out = 2 , 100f/x5r/ceramic v in = 12v, v out = 1.5v v in = 5v, v out = 1.5v 8 8 a a remote sense amp (ltm4603 only, not supported in the LTM4603-1) (note 3) v osns + , v osns C cm range common mode input voltage range v in = 12v, run > 2v 0 intv cc C 1 v diffv out range output voltage range v in = 12v, diff out load = 100k 0 intv cc v v os input offset voltage magnitude 1mv av differential gain 1v/v gbp gain bandwidth product 3 mhz sr slew rate 2 v/s r in input resistance v osns + to gnd 20 k cmrr common mode rejection ratio 100 db the denotes the speci? cations which apply over the C40c to 85c temperature range, otherwise speci? cations are at t a = 25c, v in = 12v. per typical application (front page) con? guration. electrical characteristics
ltm4603/LTM4603-1 4 4603p symbol parameter conditions min typ max units control stage v fb error ampli? er input voltage accuracy i out = 0a, v out = 1.5v 0.594 0.6 0.606 v v run run pin on/off threshold 1 1.5 1.9 v i ss/track soft-start charging current v ss/track = 0v C1.1 C1.4 C1.7 a t on(min) minimum on time (note 4) 50 100 ns t off(min) minimum off time (note 4) 250 400 ns r pllin pllin input resistance 50 k i drvcc current into drv cc pin v out = 1.5v, i out = 2.5a, frequency = 1mhz, drv cc = 5v 18 25 ma r fbhi resistor between v out and v fb 60.098 60.4 60.702 k v mpgm margin reference voltage 1.18 v v marg0 , v marg1 marg0, marg1 voltage thresholds 1.4 v pgood output v fbh pgood upper threshold v fb rising 7 10 13 % v fbl pgood lower threshold v fb falling C7 C10 C13 % v fb(hys) pgood hysteresis v fb returning 1.5 3 % v pgl pgood low voltage i pgood = 5ma 0.15 0.4 v the denotes the speci? cations which apply over the C40c to 85c temperature range, otherwise speci? cations are at t a = 25c, v in = 12v. per typical application (front page) con? guration. 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 ltm4603e 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 ltm4603i is guaranteed and tested over the C40c to 85c temperature range. note 3: remote sense ampli? er recommended for 3.3v output. note 4: 100% tested at wafer level only.
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