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ltm4600hv 1 4600hvfd load current (a) 0 efficiency (%) 6 4600hv ta01b 24 8 10 80 90 100 70 60 50 40 30 1.8v out 2.5v out 3.3v out 5v out 10a, 28v in high ef ciency dc/dc ?odule the ltm ? 4600hv is a complete 10a, dc/dc step down power supply with up to 28v input operation. included in the package are the switching controller, power fets, inductor, and all support components. operating over an input voltage range of 4.5v to 28v, the ltm4600hv supports an output voltage range of 0.6v to 5v, set by a single resistor. this high ef? ciency design delivers 10a continuous current (12a peak), needing no heat sinks or air? ow to meet power speci? cations. only bulk input and output capacitors are needed to ? nish the design. the low pro? le package (2.8mm) enables utilization of unused space on the bottom of pc boards for high density point of load regulation. high switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacri? cing stability. fault protection features include integrated overvoltage and short circuit protection with a defeatable shutdown timer. a built-in soft-start timer is adjustable with a small capacitor. the ltm4600hv is packaged in a thermally enhanced, compact (15mm 15mm) and low pro? le (2.8mm) over- molded land grid array (lga) package suitable for auto- mated assembly by standard surface mount equipment. the ltm4600hv is pb-free and rohs compliant. n telecom and networking equipment n military and avionics systems n industrial equipment n point of load regulation n servers n complete switch mode power supply n wide input voltage range: 4.5v to 28v n 10a dc, 12a peak output current n parallel two module? dc/dc converters for 20a output current n 0.6v to 5v output voltage n 1.5% output voltage regulation n ultrafast transient response n current mode control n C55c to 125c operating temperature range (ltm4600hvmpv) n pb-free (e4) rohs compliant package gold-pad finish n up to 92% ef? ciency n programmable soft-start n output overvoltage protection n optional short-circuit shutdown timer n small footprint, low pro? le (15mm 15mm 2.8mm) lga package 10a module power supply with 4.5v to 28v input ef? ciency vs load current with 24v in (fcb = 0) v in c in 4600hv ta01a ltm4600hv pgnd sgnd v out v oset v in 4.5v to 28v absmax v out 2.5v* 10a c out 31.6k *review de-rating curve at the higher input voltage l , lt, ltc and ltm 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. typical application features applications description
ltm4600hv 2 4600hvfd fcb, extv cc , pgood, run/ss, v out .......... ?0.3v to 6v v in , sv in , f adj ............................................ ?0.3v to 28v v oset , comp ............................................. ?0.3v to 2.7v operating temperature range (note 2) e and i grades ..................................... ?40c to 85c mp grade ........................................... ?55c to 125c junction temperature ........................................... 125c storage temperature range ................... ?55c to 125c (note 1) the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c, v in = 12v. external c in = 120f, c out = 200f/ceramic per typical application (front page) con? guration. symbol parameter conditions min typ max units v in(dc) input dc voltage absmax 28v for tolerance on 24v inputs l 4.5 28 v v out(dc) output voltage fcb = 0v v in = 5v or 12v, v out = 1.5v, i out = 0a l 1.478 1.470 1.50 1.50 1.522 1.530 v v input speci? cations v in(uvlo) under voltage lockout threshold i out = 0a 3.4 4 v i inrush(vin) input inrush current at startup i out = 0a, v out = 1.5v, fcb = 0 v in = 5v v in = 12v v in = 24v 0.6 0.7 0.8 a a a i q(vin) input supply bias current i out = 0a, extv cc open v in = 12v, v out = 1.5v, fcb = 5v v in = 12v, v out = 1.5v, fcb = 0v v in = 24v, v out = 2.5v, fcb = 5v v in = 24v, v out = 2.5v, fcb = 0v shutdown, run = 0.8v, v in = 12v 1.2 42 1.8 36 35 75 ma ma ma ma a min on time 100 ns min off time 400 ns i s(vin) input supply current v in = 12v, v out = 1.5v, i out = 10a v in = 12v, v out = 3.3v, i out = 10a v in = 5v, v out = 1.5v, i out = 10a v in = 24v to 3.3v at 10a, extv cc = 5v 1.52 3.13 3.64 1.6 a a a a run/ss fcb pgood v in pgnd v out comp sgnd extv cc v oset f adj sv in lga package 104-lead ( 15mm 15mm 2.8mm ) top view t jmax = 125c,
ltm4600hv 3 4600hvfd symbol parameter conditions min typ max units 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 v in = 24v, v out = 2.5v (note 3) 0 0 10 10 a a 6 v out(line) v out line regulation accuracy v out = 1.5v. fcb = 0v, i out = 0a, v in = 4.5v to 28v l 0.15 0.3 % 6 v out(load) v out load regulation accuracy v out = 1.5v. fcb = 0v, i out = 0a to 10a v in = 5v v in = 12v (notes 4, 5) l 1 1.5 % % v out(ac) output ripple voltage v in = 12v, v out = 1.5v, fcb = 0v, i out = 0a 10 15 mv p-p fs output ripple voltage frequency fcb = 0v, i out = 5a, v in = 12v, v out = 1.5v 850 khz t start turn-on time v out = 1.5v, i out = 1a v in = 12v v in = 5v 0.5 0.7 ms ms 6 v outls voltage drop for dynamic load step v out = 1.5v, load step: 0a/s to 5a/s c out = 3 ? 22f 6.3v, 470f 4v poscap , see table 2 36 mv t settle settling time for dynamic load step v in = 12v load: 10% to 90% to 10% of full load 25 s i outpk output current limit output voltage in foldback v in = 24v, v out = 2.5v v in = 12v, v out = 1.5v v in = 5v, v out = 1.5v 17 17 17 a a a control stage v oset voltage at v oset pin i out = 0a, v out = 1.5v l 0.591 0.594 0.6 0.6 0.609 0.606 v v v run/ss run on/off threshold 0.8 1.5 2 v i run(c)/ss soft-start charging current v run/ss = 0v C0.5 C1.2 C3 a i run(d)/ss soft-start discharging current v run/ss = 4v 0.8 1.8 3 a v in C sv in extv cc = 0v, fcb = 0v 100 mv i extvcc current into extv cc pin extv cc = 5v, fcb = 0v, v out = 1.5v, i out = 0a 16 ma r fbhi resistor between v out and v oset pins 100 k 1 v fcb forced continuous threshold 0.57 0.6 0.63 v i fcb forced continuous pin current v fcb = 0.6v C1 C2 a pgood output 6 v oseth pgood upper threshold v oset rising 7.5 10 12.5 % 6 v osetl pgood lower threshold v oset falling C7.5 C10 C12.5 % 6 v oset(hys) pgood hysteresis v oset returning 2 % v pgl pgood low voltage i pgood = 5ma 0.15 0.4 v the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c, v in = 12v. external c in = 120f, c out = 200f/ceramic per typical application (front page) con? guration. 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 ltm4600hve 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 ltm46000hvmp is guaranteed and tested over the C55c to 125c temperature range. for output current derating at high temperature, please refer to thermal considerations and output current derating discussion. note 3: refer to current de-rating curves and thermal application note. note 4: test assumes current derating versus temperature. note 5: guaranteed by correlation. electrical characteristics
ltm4600hv 4 4600hvfd ef? ciency vs load current w ith 5v in (fcb = 0) ef? ciency vs load current with 12v in ( fcb = 0 ) ef? ciency vs load current with 24v in (fcb = 0) ef? ciency vs load current with different fcb settin g s 1.2v transient response 1.5v transient response 1.8v transient res p onse 2.5v transient res p onse 3.3v transient res p onse 25s/div 4600hv g05 1.2v at 5a/s load step c out = 3 ? 22f 6.3v ceramics 470f 4v sanyo poscap c3 = 100pf 25s/div 4600hv g06 1.5v at 5a/s load step c out = 3 ? 22f 6.3v ceramics 470f 4v sanyo poscap c3 = 100pf 25s/div 4600hv g07 1.8v at 5a/s load step c out = 3 ? 22f 6.3v ceramics 470f 4v sanyo poscap c3 = 100pf 25s/div 4600hv g08 2.5v at 5a/s load step c out = 3 ? 22f 6.3v ceramics 470f 4v sanyo poscap c3 = 100pf 25s/div 4600hv g09 3.3v at 5a/s load step c out = 3 ? 22f 6.3v ceramics 470f 4v sanyo poscap c3 = 100pf v out = 50mv/div i out = 5a/div (see figure 21 for all curves) typical performance characteristics load current (a) 0 100 90 80 70 60 50 40 30 6 4600hv g01 24 810 efficiency (%) 0.6v out 1.2v out 1.5v out 2.5v out load current (a) 0 efficiency (%) 50 60 70 6 4600hv g02 40 30 24 8 80 90 100 10 0.6v out 1.2v out 1.5v out 2.5v out 3.3v out load current (a) 0 efficiency (%) 6 4600hv g03 24 8 10 80 90 100 70 60 50 40 30 1.8v out 2.5v out 3.3v out 5v out load current (a) 20 50 40 30 90 80 70 60 4600hv g04 efficiency (%) 0.1 10 1 fcb = gnd fcb > 0.7v v in = 12v v out = 1.5v
ltm4600hv 5 4600hvfd start-up, i out = 0a start-up, i out = 10a ( resistive load ) short-circuit protection, i out = 0a short-circuit protection, i out = 10a 200s/div 4600hv g10 v in = 12v v out = 1.5v c out = 200f no external soft-start capacitor v out (0.5v/div) i in (0.5a/div) 200s/div 4600hv g11 v in = 12v v out = 1.5v c out = 200f no external soft-start capacitor v out (0.5v/div) i in (0.5a/div) 20s/div 4600hv g12 v in = 12v v out = 1.5v c out = 2 200f/x5r no external soft-start capacitor v out (0.5v/div) i in (0.2a/div) 20s/div 4600hv g13 v in = 12v v out = 1.5v c out = 2 200f/x5r no external soft-start capacitor v out (0.5v/div) i in (0.5a/div) v in to v out ste p down ratio (see figure 21 for all curves) v oset vs tem p erature start-u p waveform, t a = C55c typical performance characteristics v in (v) 0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 515 4600hv g14 10 24 20 v out (v) 5v 3.3v f adj = open 2.5v 1.8v 1.5v 1.2v 0.6v see frequency adjustment discussion for 12v in to 5v out and 5v in to 3.3v out conversion temperature ( c) C55 0.590 v oset (v) 0.595 0.600 0.605 0.610 C25 5 35 65 4600hv g15 95 125 v in = 12v v out = 1.5v i out = 10a 400 + s/div 4600hv g16 12v i npu t l oa d r egu l a ti on vs tem p erature load current 0 C0.45 load regulation % C0.40 C0.35 C0.10 C0.15 C0.20 C0.25 C0.30 C0.05 0.00 5 4600hv g17 10 25 c 100 c C45 c
ltm4600hv 6 4600hvfd v in (bank 1): power input pins. apply input voltage between these pins and gnd pins. recommend placing input decoupling capacitance directly between v in pins and gnd pins. f adj (pin a15): a 110k resistor from v in to this pin sets the one-shot timer current, thereby setting the switching frequency. the ltm4600hv switching frequency is typically 850khz. an external resistor to ground can be selected to reduce the one-shot timer current, thus lower the switching frequency to accommodate a higher duty cycle step down requirement. see the applications section. sv in (pin a17): supply pin for internal pwm controller. leave this pin open or add additional decoupling capacitance. extv cc (pin a19): external 5v supply pin for controller. if left open or grounded, the internal 5v linear regulator will power the controller and mosfet drivers. for high input voltage applications, connecting this pin to an external 5v will reduce the power loss in the power module. the extv cc voltage should never be higher than v in . v oset (pin a21): the negative input of the error ampli? er. internally, this pin is connected to v out with a 100k precision resistor. different output voltages can be programmed with additional resistors between the v oset and sgnd pins. comp (pin b23): current control threshold and error ampli? er compensation point. the current comparator threshold increases with this control voltage. the voltage ranges from 0v to 2.4v with 0.8v corresponding to zero sense voltage (zero current). sgnd (pin d23): signal ground pin. all small-signal components should connect to this ground, which in turn connects to pgnd at one point. run/ss (pin f23): run and soft-start control. forcing this pin below 0.8v will shut down the power supply. inside the power module, there is a 1000pf capacitor which provides approximately 0.7ms soft-start time with 200f output capacitance. additional soft-start time can be achieved by adding additional capacitance between the run/ss and sgnd pins. the internal short-circuit latchoff can be disabled by adding a resistor between this pin and the v in pin. this resistor must supply a minimum 5a pull up current. fcb (pin g23): forced continuous input. grounding this pin enables forced continuous mode operation regardless of load conditions. tying this pin above 0.63v enables discontinuous conduction mode to achieve high ef? ciency operation at light loads. there is an internal 4.75k resistor between the fcb and sgnd pins. pgood (pin j23): output voltage power good indicator. when the output voltage is within 10% of the nominal voltage, the pgood is open drain output. otherwise, this pin is pulled to ground. pgnd (bank 2): power ground pins for both input and output returns. v out (bank 3): power output pins. apply output load between these pins and gnd pins. recommend placing high frequency output decoupling capacitance directly between these pins and gnd pins. (see package description for pin assignment) pin functions e c a run/ss fcb pgood v in bank 1 pgnd bank 2 v out bank 3 comp sgnd extv cc v oset f adj sv in top view 35 24 79 68 11 13 10 12 15 17 14 16 19 21 18 20 22 94 95 96 97 98 99 100 101 102 103 104 93 82 71 60 49 24 23 22 21 20 19 18 17 16 7 6 5 4 3 2 40 51 62 73 84 85 86 87 88 89 90 91 74 75 76 77 78 79 80 63 64 65 66 67 68 69 52 53 54 55 56 57 58 42 43 44 45 46 47 92 81 70 59 48 11 10 9 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 41 1 8 12 25 32 39 50 61 72 83 1 23 b d f g h j l m n p r t k 4600hv pn01
ltm4600hv 7 4600hvfd symbol parameter conditions min typ max units c in external input capacitor requirement (v in = 4.5v to 28v, v out = 2.5v) i out = 10a, 2x 10f 35v ceramic taiyo yuden gdk316bj106ml 20 f c out external output capacitor requirement (v in = 4.5v to 28v, v out = 2.5v) i out = 10a, refer to table 2 in the applications information section 100 200 f t a = 25c, v in = 12v. use figure 1 con? guration. figure 1. simpli? ed ltm4600hv block diagram simplified block diagram 4600hv f01 run/ss ltm4600hv v oset extv cc sgnd f adj fcb 1000pf q1 q2 v out , 2.5v/10a max pgnd v in , 4.5v to 28v abs max sv in comp pgood r6 31.6k 100k 0.5% 4.75k 1.5 + f c in 15 + f 6.3v c out 10 1 int comp controller decoupling requirements
ltm4600hv 8 4600hvfd module description the ltm4600hv is a standalone non-isolated synchronous switching dc/dc power supply. it can deliver up to 10a of dc output current with only bulk external input and output capacitors. this module provides a precisely regulated output voltage programmable via one external resistor from 0.6v dc to 5.0v dc . the input voltage range is 4.5v to 28v. a simpli? ed block diagram is shown in figure 1 and the typical application schematic is shown in figure 21. the ltm4600hv contains an integrated ltc constant on-time current-mode regulator, ultra-low r ds(on) fets with fast switching speed and integrated schottky diode. the typical switching frequency is 850khz at full load. with current mode control and internal feedback loop compensation, the ltm4600hv module has suf? cient stability margins and good transient performance under a wide range of operating conditions and with a wide range of output capacitors, even all ceramic output capacitors (x5r or x7r for extended temperature range). current mode control provides cycle-by-cycle fast current limit. in addition, foldback current limiting is provided in an over-current condition while v oset drops. also, the ltm4600hv has defeatable short circuit latch off. internal overvoltage and undervoltage comparators pull the open- drain pgood output low if the output feedback voltage exits a 10% window around the regulation point. furthermore, in an overvoltage condition, internal top fet q1 is turned off and bottom fet q2 is turned on and held on until the overvoltage condition clears. pulling the run/ss pin low forces the controller into its shutdown state, turning off both q1 and q2. releasing the pin allows an internal 1.2a current source to charge up the softstart capacitor. when this voltage reaches 1.5v, the controller turns on and begins switching. at low load current the module works in continuous cur- rent mode by default to achieve minimum output voltage ripple. it can be programmed to operate in discontinuous current mode for improved light load ef? ciency when the fcb pin is pulled up above 0.8v and no higher than 6v. the fcb pin has a 4.75k resistor to ground, so a resistor to v in can set the voltage on the fcb pin. when extv cc pin is grounded or open, an integrated 5v linear regulator powers the controller and mosfet gate drivers. if a minimum 4.7v external bias supply is ap- plied on the extv cc pin, the internal regulator is turned off, and an internal switch connects extv cc to the gate driver voltage. this eliminates the linear regulator power loss with high input voltage, reducing the thermal stress on the controller. the maximum voltage on extv cc pin is 6v. the extv cc voltage should never be higher than the v in voltage. also extv cc must be sequenced after v in . recommended for 24v operation to lower temperature in the module. operation
ltm4600hv 9 4600hvfd voltage is margined up. the output voltage is margined down when q down is on and q up is off. if the output voltage v o needs to be margined up/down by m%, the resistor values of r up and r down can be calculated from the following equations: (r set r u p )?v o ?(1 + m%) (r set r u p ) + 100k = 0.6v r set ?v o ?(1?m%) r set + (100k r dow n ) = 0.6v input capacitors the ltm4600hv module should be connected to a low ac-impedance dc source. high frequency, low esr input capacitors are required to be placed adjacent to the mod- ule. in figure 21, the bulk input capacitor c in is selected for its ability to handle the large rms current into the converter. for a buck converter, the switching duty-cycle can be estimated as: d = v o v i n without considering the inductor current ripple, the rms current of the input capacitor can be estimated as: i cin(rms) = i o(max) % ?d?(1 d ) in the above equation, d % is the estimated ef? ciency of the power module. c1 can be a switcher-rated electrolytic aluminum capacitor, os-con capacitor or high volume ceramic capacitors. note the capacitor ripple current ratings are often based on only 2000 hours of life. this makes it advisable to properly derate the input capacitor, or choose a capacitor rated at a higher temperature than required. always contact the capacitor manufacturer for derating requirements over temperature. in figure 21, the input capacitors are used as high fre- quency input decoupling capacitors. in a typical 10a output application, 1-2 pieces of very low esr x5r or x7r (for extended temperature range), 10f ceramic capacitors are recommended. this decoupling capacitor the typical ltm4600hv application circuit is shown in figure 21. external component selection is primarily determined by the maximum load current and output voltage. output voltage programming and margining the pwm controller of the ltm4600hv has an internal 0.6v1% reference voltage. as shown in the block dia- gram, a 100k/0.5% internal feedback resistor connects v out and v oset pins. adding a resistor r set from v oset pin to sgnd pin programs the output voltage: v o = 0.6v ? 100k + r set r se t table 1 shows the standard values of 1% r set resistor for typical output voltages: table 1. r set (k 1 ) open 100 66.5 49.9 43.2 31.6 22.1 13.7 v o (v) 0.6 1.2 1.5 1.8 2 2.5 3.3 5 voltage margining is the dynamic adjustment of the output voltage to its worst case operating range in production testing to stress the load circuitry, verify control/protec- tion functionality of the board and improve the system reliability. figure 2 shows how to implement margining function with the ltm4600hv. in addition to the feedback resistor r set , several external components are added. turn off both transistor q up and q down to disable the margining. when q up is on and q down is off, the output figure 2. ltm4600hv margining implementation pgnd sgnd 4600hv f02 ltm4600hv v out v oset r set r up q up 100k 2n7002 r down q down 2n7002 applications information
ltm4600hv 10 4600hvfd should be placed directly adjacent the module input pins in the pcb layout to minimize the trace inductance and high frequency ac noise. output capacitors the ltm4600hv is designed for low output voltage ripple. the bulk output capacitors c out is chosen with low enough effective series resistance (esr) to meet the output voltage ripple and transient requirements. c out can be low esr tantalum capacitor, low esr polymer capacitor or ceramic capacitor (x5r or x7r). the typical capacitance is 200f if all ceramic output capacitors are used. the internally optimized loop compensation provides suf? cient stability margin for all ceramic capacitors applications. additional output ? ltering may be required by the system designer, if further reduction of output ripple or dynamic transient spike is required. refer to table 2 for an output capaci- tance matrix for each output voltage droop, peak to peak deviation and recovery time during a 5a/s transient with a speci? c output capacitance. fault conditions: current limit and over current foldback the ltm4600hv has a current mode controller, which inherently limits the cycle-by-cycle inductor current not only in steady state operation, but also in transient. to further limit current in the event of an over load condi- tion, the ltm4600hv provides foldback current limiting. if the output voltage falls by more than 50%, then the maximum output current is progressively lowered to about one sixth of its full current limit value. soft-start and latchoff with the run/ss pin the run/ss pin provides a means to shut down the ltm4600hv as well as a timer for soft-start and over- current latchoff. pulling the run/ss pin below 0.8v puts the ltm4600hv into a low quiescent current shutdown (i q 75a). releasing the pin allows an internal 1.2a current source to charge up the timing capacitor c ss . inside ltm4600hv, there is an internal 1000pf capaci- tor from run/ss pin to ground. if run/ss pin has an external capacitor c ss_ext to ground, the delay before starting is about: t delay = 1.5v 1.2 a ?(c ss _ext + 1000pf) when the voltage on run/ss pin reaches 1.5v, the lt- m4600hv internal switches are operating with a clamping of the maximum output inductor current limited by the run/ss pin total soft-start capacitance. as the run/ss pin voltage rises to 3v, the soft-start clamping of the inductor current is released. v in to v out stepdown ratios there are restrictions in the maximum v in to v out step down ratio that can be achieved for a given input voltage. these contraints are shown in the typical performance characteristics curves labeled v in to v out stepdown ratio. note that additional thermal de-rating may apply. see the thermal considerations and output current de- rating sections of this data sheet. applications information
ltm4600hv 11 4600hvfd table 2. output voltage response versus component matrix *(refer to figure 21) typical measured values c out1 vendors part number c out2 vendors part number tdk c4532x5r0j107mz (100f,6.3v) sanyo poscap 6tpe330mil (330f, 6.3v) taiyo yuden jmk432bj107mu-t ( 100f, 6.3v) sanyo poscap 2r5tpe470m9 (470f, 2.5v) taiyo yuden jmk316bj226ml-t501 ( 22f, 6.3v) sanyo poscap 4tpe470mcl (470f, 4v) taiyo yuden jmk316bj226ml-t501 ( 22f, 6.3v) sanyo poscap 6tpd470m (470f, 6.3v) v out (v) c in (ceramic) c in (bulk) c out1 (ceramic) c out2 (bulk) c comp c3 v in (v) droop (mv) peak to peak (mv) recovery time (s) load step (a/s) 1.2 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 5 35 68 25 5 1.2 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 5 35 70 20 5 1.2 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 5 40 80 20 5 1.2 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 5 49 98 20 5 1.2 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 12 35 68 25 5 1.2 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 12 35 70 20 5 1.2 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 12 40 80 20 5 1.2 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 12 49 98 20 5 1.5 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 5 36 75 25 5 1.5 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 5 37 79 20 5 1.5 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 5 44 84 20 5 1.5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 5 61 118 20 5 1.5 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 12 36 75 25 5 1.5 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 12 37 79 20 5 1.5 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 12 44 89 20 5 1.5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 12 54 108 20 5 1.8 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 5 40 81 30 5 1.8 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 5 44 88 20 5 1.8 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 5 46 91 20 5 1.8 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 5 62 128 20 5 1.8 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 12 40 81 30 5 1.8 2 10f 35v 150f 35v 1 100f 6.3v 470f 2.5v none 100pf 12 44 85 20 5 1.8 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 12 44 91 20 5 1.8 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 12 62 125 20 5 2.5 2 10f 35v 150f 35v 1 100f 6.3v 470f 4v none 100pf 5 48 103 30 5 2.5 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 5 56 113 30 5 2.5 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 5 57 116 30 5 2.5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 5 60 115 25 5 2.5 2 10f 35v 150f 35v 1 100f 6.3v 470f 4v none 100pf 12 48 103 30 5 2.5 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 12 51 102 30 5 2.5 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 12 56 113 30 5 2.5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 12 70 159 25 5 2.5 2 10f 35v 150f 35v 3 22f 6.3v 470f 6.3v none 100pf 24 56 112 30 5 2.8 2 10f 35v 150f 35v 3 22f 6.3v 470f 6.3v none 100pf 24 50 100 30 5 3.3 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 7 64 126 30 5 3.3 2 10f 35v 150f 35v 1 100f 6.3v 470f 4v none 100pf 7 66 132 30 5 3.3 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 7 82 166 35 5 3.3 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 7 100 200 25 5 3.3 2 10f 35v 150f 35v 1 100f 6.3v 470f 4v none 100pf 12 52 106 30 5 3.3 2 10f 35v 150f 35v 3 22f 6.3v 470f 4v none 100pf 12 64 129 35 5 3.3 2 10f 35v 150f 35v 2 100f 6.3v 330f 6.3v none 100pf 12 64 126 30 5 3.3 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 12 76 144 25 5 3.3 2 10f 35v 150f 35v 3 22f 6.3v 470f 6.3v none 100pf 24 74 149 30 5 5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 15 188 375 25 5 5 2 10f 35v 150f 35v 4 100f 6.3v none none 100pf 20 159 320 25 5 *x7r is recommended for extended temperature range. applications information
ltm4600hv 12 4600hvfd after the controller has been started and given adequate time to charge up the output capacitor, c ss is used as a short-circuit timer. after the run/ss pin charges above 4v, if the output voltage falls below 75% of its regulated value, then a short-circuit fault is assumed. a 1.8a current then begins discharging c ss . if the fault condition persists until the run/ss pin drops to 3.5v, then the controller turns off both power mosfets, shuting down the converter permanently. the run/ss pin must be actively pulled down to ground in order to restart operation. the over-current protection timer requires the soft-start timing capacitor c ss be made large enough to guarantee that the output is in regulation by the time c ss has reached the 4v threshold. in general, this will depend upon the size of the output capacitance, output voltage and load current characteristic. a minimum external soft-start capacitor can be estimated from: c ss _ext + 1000pf > c out ?v out (10 ?3 [f / v s ]) generally 0.1f is more than suf? cient. since the load current is already limited by the current mode control and current foldback circuitry during a shortcircuit, over-current latchoff operation is not always needed or desired, especially the output has large amount of capacitance or the load draw huge current during start up. the latchoff feature can be overridden by a pull-up current greater than 5a but less than 80a to the run/ss pin. the additional current prevents the discharge of c ss during a fault and also shortens the soft-start period. us- ing a resistor from run/ss pin to v in is a simple solution v in v in r run/ss run/ss 4600hv f04 ltm4600hv pgnd sgnd v in 4.5v to 5.5v 10.8v to 13.8v 24v to 28v r run/ss 50k 150k 500k recommended values for run/ss figure 4. defeat short-circuit latchoff with a pull-up resistor to v in figure 3. run/ss pin voltage during startup and short-circuit protection v run/ss 3.5v t t 75%v o switching starts soft-start clamping of i l released short-circuit latchoff output overload happens short-circuit latch armed 4v 3v 1.5v 4600hv f03 v o to defeat latchoff. any pull-up network must be able to maintain run/ss above 4v maximum latchoff threshold and overcome the 4a maximum discharge current. figure 3 shows a conceptual drawing of v run during startup and short circuit. applications information
ltm4600hv 13 4600hvfd enable the run/ss pin can be driven from logic as shown in figure 5. this function allows the ltm4600hv to be turned on or off remotely. the on signal can also control the sequence of the output voltage. figure 5. enable circuit with external logic run/ss 4600hv f05 ltm4600hv pgnd 2n7002 sgnd on figure 6. output voltage tracking with the ltc2923 controller q1 v cc v in v in r onb v in 5v r tb1 r tb2 49.9k 1.8v 3.3v r ta2 r ta1 r ona on rampbuf track1 track2 fb1 gate ltc2923 gnd 4600hv f06 ramp 66.5k 1.5v ltm4600hv v in v out ltm4600hv dc/dc v in v out v oset v oset fb2 sdo status output voltage tracking for the applications that require output voltage tracking, several ltm4600hv modules can be programmed by the power supply tracking controller such as the ltc2923. figure 6 shows a typical schematic with ltc2923. coin- cident, ratiometric and offset tracking for v o rising and falling can be implemented with different sets of resistor values. see the ltc2923 data sheet for more details. extv cc connection an internal low dropout regulator produces an internal 5v supply that powers the control circuitry and fet drivers. therefore, if the system does not have a 5v power rail, the ltm4600hv can be directly powered by v in . the gate driver current through ldo is about 18ma. the internal ldo power dissipation can be calculated as: p ldo_loss = 18ma ? (v in C 5v) the ltm4600hv also provides an external gate driver voltage pin extv cc . if there is a 5v rail in the system, it is recommended to connect extv cc pin to the external 5v rail. whenever the extv cc pin is above 4.7v, the internal 5v ldo is shut off and an internal 50ma p-channel switch connects the extv cc to internal 5v. internal 5v is supplied from extv cc until this pin drops below 4.5v. do not apply more than 6v to the extv cc pin and ensure that extv cc < v in . the following list summaries the possible connec- tions for extv cc : 1. extv cc grounded. internal 5v ldo is always powered from the internal 5v regulator. 2. extv cc connected to an external supply. internal ldo is shut off. a high ef? ciency supply compatible with the mosfet gate drive requirements (typically 5v) can im- prove overall ef? ciency. with this connection, it is always required that the extv cc voltage can not be higher than v in pin voltage. 3. extv cc is recommended for v in > 20v discontinuous operation and fcb pin the fcb pin determines whether the internal bottom mosfet remains on when the current reverses. there is an internal 4.75k pull-down resistor connecting this pin to ground. the default light load operation mode is forced continuous (pwm) current mode. this mode provides minimum output voltage ripple. applications information
ltm4600hv 14 4600hvfd explanation of the analysis for the thermal models, and the derating curves. tables 3 and 4 provide a summary of the equivalent e ja for the noted conditions. these equivalent e ja parameters are correlated to the measure values, and improved with air-? ow. the case temperature is maintained at 100c or below for the derating curves. this allows for 4w maximum power dissipation in the total module with top and bottom heatsinking, and 2w power dissipation through the top of the module with an approximate e jc between 6c/w to 9c/w. this equates to a total of 124c at the junction of the device. safety considerations the ltm4600hv modules do not provide isolation from v in to v out . there is no internal fuse. if required, a slow blow fuse with a rating twice the maximum input current should be provided to protect each unit from catastrophic failure. layout checklist/example the high integration of the ltm4600hv makes the pcb board layout very simple and easy. however, to optimize its electrical and thermal performance, some layout con- siderations are still necessary. ? use large pcb copper areas for high current path, in- cluding v in , pgnd and v out . it helps to minimize the pcb conduction loss and thermal stress ? place high frequency ceramic input and output capaci- tors next to the v in , pgnd and v out pins to minimize high frequency noise ? place a dedicated power ground layer underneath the unit ? to minimize the via conduction loss and reduce module thermal stress, use multiple vias for interconnection between top layer and other power layers ? do not put vias directly on pad unless they are capped. ? use a separated sgnd ground copper area for com- ponents connected to signal pins. connect the sgnd to pgnd underneath the unit figure 20 gives a good example of the recommended layout. in the application where the light load ef? ciency is im- portant, tying the fcb pin above 0.6v threshold enables discontinuous operation where the bottom mosfet turns off when inductor current reverses. therefore, the conduc- tion loss is minimized and light load ef? ciency is improved. the penalty is that the controller may skip cycle and the output voltage ripple increases at light load. paralleling operation with load sharing two or more ltm4600hv modules can be paralleled to provide higher than 10a output current. figure 7 shows the necessary interconnection between two paralleled modules. the opti-loop? current mode control ensures good current sharing among modules to balance the ther- mal stress. the new feedback equation for two or more ltm4600hvs in parallel is: v out = 0.6v ? 100k n + r set r se t where n is the number of ltm4600hvs in parallel. figure 7. parallel two modules with load sharing v in v out v in v out (20a max ) 4600hv f07 ltm4600hv pgnd sgnd comp v oset r set v in v out ltm4600hv pgnd sgnd comp v oset opti-loop is a trademark of linear technology corporation. thermal considerations and output current derating the power loss curves in figures 8 and 15 can be used in coordination with the load current derating curves in figures 9 to 14, and figures 16 to 19 for calculating an approximate e ja for the module with various heatsink- ing methods. thermal models are derived from several temperature measurements at the bench, and thermal modeling analysis. application note 103 provides a detailed applications information
ltm4600hv 15 4600hvfd figure 12. bga heatsink figure 11. no heatsink figure 10. bga heatsink figure 9. no heatsink figure 8. 1.5v power loss curves vs load current figure 14. bga heatsink figure 13. no heatsink figure 15. 3.3v power loss curves vs load current figure 16. no heatsink applications information output current (a) 08 6 4600hv f08 24 10 3.5 4.0 4.5 3.0 2.5 2.0 1.5 1.0 0.5 0 power loss (w) 5v loss 12v loss 18v loss v out = 1.5v ambient temperature ( c) 50 70 4600hv f09 60 80 90 v in = 5v v out = 1.5v 400 lfm 200 lfm 0 lfm maximum load current (a) 10 9 8 7 6 5 4 ambient temperature ( c) 50 maximum load current (a) 70 4600hv f10 60 80 90 100 v in = 5v v out = 1.5v 400 lfm 200 lfm 0 lfm 10 9 8 7 6 5 4 ambient temperature ( c) 50 55 70 4600hv f11 60 65 75 80 85 90 v in = 12v v out = 1.5v 400 lfm 200 lfm 0 lfm maximum load current (a) 10 9 8 7 6 5 4 ambient temperature ( c) 50 maximum load current (a) 70 4600hv f12 60 10 9 8 7 6 5 3 4 80 90 100 v in = 12v v out = 1.5v 400 lfm 200 lfm 0 lfm ambient temperature ( c) 40 50 70 4600hv f13 60 80 90 v in = 18v v out = 1.5v 400 lfm 200 lfm 0 lfm maximum load current (a) 10 9 8 7 6 5 0 1 2 3 4 ambient temperature ( c) 50 maximum load current (a) 70 4600hv f14 60 10 8 6 4 0 2 80 90 100 v in = 18v v out = 1.5v 400 lfm 200 lfm 0 lfm output current (a) 08 6 4600hv f15 24 10 3.5 4.0 5.0 4.5 3.0 2.5 2.0 1.5 1.0 0.5 0 power loss (w) 12v loss 24v loss ambient temperature ( c) 40 70 4600hv f16 60 50 80 90 v in = 12v v out = 3.3v 400 lfm 200 lfm 0 lfm maximum load current (a) 10 9 8 7 6 4 5 0 1 2 3
ltm4600hv 16 4600hvfd figure 17. bga heatsink figure 19. bga heatsink figure 18. no heatsink table 4. 3.3v output derating curve v in (v) power loss curve air flow (lfm) heatsink e ja (c/w) figures 16, 18 12, 24 figure 15 0 none 15.2 figures 16, 18 12, 24 figure 15 200 none 14.6 figures 16, 18 12, 24 figure 15 400 none 13.4 figures 17, 19 12, 24 figure 15 0 bga heatsink 13.9 figures 17, 19 12, 24 figure 15 200 bga heatsink 11.1 figures 17, 19 12, 24 figure 15 400 bga heatsink 10.5 table 3. 1.5v output derating curve v in (v) power loss curve air flow (lfm) heatsink e ja (c/w) figures 9, 11, 13 5, 12, 18 figure 8 0 none 15.2 figures 9, 11, 13 5, 12, 18 figure 8 200 none 14 figures 9, 11, 13 5, 12, 18 figure 8 400 none 12 figures 10, 12, 14 5, 12, 18 figure 8 0 bga heatsink 13.9 figures 10, 12, 14 5, 12, 18 figure 8 200 bga heatsink 11.3 figures 10, 12, 14 5, 12, 18 figure 8 400 bga heatsink 10.25 applications information ambient temperature ( c) 40 50 maximum load current (a) 70 4600hv f17 60 80 90 100 v in = 12v v out = 3.3v 400 lfm 200 lfm 0 lfm 10 9 8 7 6 5 4 ambient temperature ( c) 50 70 4600hv f18.eps 60 80 90 v in = 24v v out = 3.3v temperature de-rating 400 lfm 200 lfm 0 lfm maximum load current (a) 10 8 6 4 0 2 ambient temperature ( c) 50 maximum load current (a) 70 4600hv f19.eps 60 80 90 400 lfm 200 lfm 0 lfm 10 9 8 7 6 5 4 v in = 24v v out = 3.3v temperature de-rating
ltm4600hv 17 4600hvfd figure 20. recommended pcb layout v in pgnd top layer v out 4600hv f20 load c in ltm4600hv frequency adjustment the ltm4600hv is designed to typically operate at 850khz across most input and output conditions. the control ar- chitecture is constant on time valley mode current control. the f adj pin is typically left open or decoupled with an optional 1000pf capacitor. the switching frequency has been optimized to maintain constant output ripple over the operating conditions. the equations for setting the operat- ing frequency are set around a programmable constant on time. this on time is developed by a programmable current into an on board 10pf capacitor that establishes a ramp that is compared to a voltage threshold equal to the output voltage up to a 2.4v clamp. this i on current is equal to: i on = (v in C 0.7v)/110k, with the 110k onboard resistor from v in to f adj . the on time is equal to t on = (v out /i on ) ? 10pf and t off = t s C t on . the frequency is equal to: freq. = dc/t on . the i on current is proportional to v in , and the regulator duty cycle is inversely proportional to v in , there- fore the step-down regulator will remain relatively constant frequency as the duty cycle adjustment takes place with lowering v in . the on time is proportional to v out up to a 2.4v clamp. this will hold frequency relatively constant with different output voltages up to 2.4v. the regulator switching period is comprised of the on time and off time as depicted in the following waveform. the on time is equal to t on = (v out /i on ) ? 10pf and t off = t s C t on . the frequency is equal to: frequency = dc/t on ). the ltm4600hv has a minimum (t on ) on time of 100 nanoseconds and a minimum (t off ) off time of 400 nanoseconds. the 2.4v clamp on the ramp threshold as a function of v out will cause the switching frequency to increase by the ratio of v out /2.4v for 3.3v and 5v outputs. this is due to the fact the on time will not increase as v out increases past 2.4v. therefore, if the nominal switching frequency is 850khz, then the switching frequency will increase to ~1.2mhz for 3.3v, and ~1.7mhz for 5v out- puts due to frequency = (dc/t on ) when the switching frequency increases to 1.2mhz, then the time period t s is reduced to ~833 nanoseconds and at 1.7mhz the switching period reduces to ~588 nanoseconds. when higher duty cycle conversions like 5v to 3.3v and 12v to 5v need to be accommodated, then the switching frequency can be lowered to alleviate the violation of the 400ns minimum off time. since the total switching period is t s = t on + t off , t off will be below the 400ns minimum off time. a resistor from the f adj pin to ground can shunt current away from the on time generator, thus allowing for a longer on time and a lower switching frequency. 12v to 5v and 5v to 3.3v derivations are explained in the data sheet to lower switching frequency and accommodate these step-down conversions. equations for setting frequency for 12v to 5v: i on = (v in C 0.7v)/110k; i on = 103a frequency = (i on /[2.4v ? 10pf]) ? dc = 1.79mhz; dc = duty cycle, duty cycle is (v out /v in ) t s = t on + t off , t on = on-time, t off = off-time of the switching period; t s = 1/frequency t off must be greater than 400ns, or t s C t on > 400ns. t on = dc ? t s 1mhz frequency or 1s period is chosen for 12v to 5v. t off period t s t on 4602 f25 (dc) duty cycle = t on t s dc = = t on t s freq = dc t on v out v in applications information
ltm4600hv 18 4600hvfd t on = 0.41 ? 1s 410ns t off = 1s C 410ns 590ns t on and t off are above the minimums with adequate guard band. using the frequency = (i on /[2.4v ? 10pf]) ? dc, solve for i on = (1mhz ? 2.4v ? 10pf) ? (1/0.41) 58a. i on current calculated from 12v input was 103a, so a resistor from f adj to ground = (0.7v/15k) = 46a. 103a C 46a = 57a, sets the adequate i on current for proper frequency range for the higher duty cycle conversion of 12v to 5v. input voltage range is limited to 9v to 16v. higher input voltages can be used without the 15k on f adj . the inductor ripple current gets too high above 16v, and the 400ns minimum off-time is limited below 9v. equations for setting frequency for 5v to 3.3v: i on = (v in C 0.7v)/110k; i on = 39a frequency = (i on /[2.4v ? 10pf]) ? dc = 1.07mhz; dc = duty cycle, duty cycle is (v out /v in ) t s = t on + t off , t on = on-time, t off = off-time of the switching period; t s = 1/frequency t off must be greater than 400ns, or t s C t on > 400ns. t on = dc ? t s ~450khz frequency or 2.22s period is chosen for 5v to 3.3v. frequency range is about 450khz to 650khz from 4.5v to 7v input. t on = 0.66 ? 2.22s 1.46s t off = 2.22s C 1.46s 760ns t on and t off are above the minimums with adequate guard band. using the frequency = (i on /[2.4v ? 10pf]) ? dc, solve for i on = (450khz ? 2.4v ? 10pf) ? (1/0.66) 16a. i on current calculated from 5v input was 39a, so a resistor from f adj to ground = (0.7v/30.1k) = 23a. 39a C 23a = 16a, sets the adequate i on current for proper frequency range for the higher duty cycle conversion of 5v to 3.3v. input voltage range is limited to 4.5v to 7v. higher input voltages can be used without the 30.1k on f adj . the inductor ripple current gets too high above 7v, and the 400ns minimum off-time is limited below 4.5v. 5v to 3.3v at 8a applications information 4600 f22 r2 22.1k 1% r1 30.1k extv cc run/ss comp fcb v out 5v to 3.3v at 8a with f adj = 30.1k ltm4600hv minimum on-time = 100ns ltm4600hv minimum off-time = 400ns c1, c3: tdk c3216x5r1e106mt c2: taiyo yuden, jmk316bj226ml c4: sanyo poscap , 6tpe330mil pgood v oset sv in pgnd sgnd 4.5v to 7v 3.3v at 8a c1 10 + f 25v c3 10 + f 25v c4 330 + f 6.3v c2 22 + f c5 100pf v in ltm4600hv f adj run/soft-start open drain efficiency = 94% +
ltm4600hv 19 4600hvfd figure 21. typical application, 5v to 24v input, 0.6v to 5v output, 10a max v in to v out stepdown ratio for 12v to 5v and 5v to 3.3v 12v to 5v at 8a applications information 4600 f23 r2 13.7k 1% r1 15k extv cc run/ss comp fcb v out 12v to 5v at 8a with f adj = 15k ltm4600hv minimum on-time = 100ns ltm4600hv minimum off-time = 400ns c1, c3: tdk c3216x5r1e106mt c2: taiyo yuden, jmk316bj226ml c4: sanyo poscap , 6tpe330mil pgood v oset sv in pgnd sgnd 9v to 16v 5v at 8a efficiency = 94% c1 10 + f 25v c3 10 + f 25v c4 330 + f 6.3v c2 22 + f c5 100pf v in ltm4600hv f adj run/soft-start open drain + v in (v) 4600 f24 1357911131517 3.3v: f adj = 30.1k 5v: f adj = 15k 5v at 8a 3.3v at 8a v out (v) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 4600hv f21 v out extv cc f adj v oset fcb comp pgood v out (multiple pins) v out run/ss sgnd pgnd (multiple pins) c out1 22 + f 6.3v 3 refer to table 2 c out2 470 + f refer to table 2 gnd 0.6v to 5v refer to step down ratio graph c4 opt v in 5v to 24v gnd c in (cer) 10 + f 2x c in (bulk) 150 + f c3 100pf r1 66.5k refer to table 1 v in (multiple pins) ltm4600hv sv in + + typical application
ltm4600hv 20 4600hvfd p ara ll e l o pera ti on an d l oa d sh ar i ng 4600hv ta02 r4 15.8k 1% extv cc run comp fcb v out v out = 0.6v ? ([100k/n] + r set )/r set where n = 2 c1, c3, c7, c8: taiyo yuden, gdk316bj106ml c2, c9: taiyo yuden, jmk316bj226ml-t501 c5, c10: sanyo poscap , 4tpe470mcl pgood v oset sv in pgnd sgnd 2.5v at 20a 4.5v to 24v 2.5v c7 10 + f 35v c8 10 + f 35v c10 470 + f 4v c9 22 + f x3 v in ltm4600hv f adj r1 100k extv cc run comp fcb v out pgood v oset sv in pgnd sgnd c1 10 + f 35v run/soft-start c3 10 + f 35v c4 220pf c5 470 + f 4v c2 22 + f x3 v in ltm4600hv f adj + + total load 0 individual share 12 10 8 6 4 2 0 5 10 15 4600hv ta03 20 i out1 i out2 12v in 2.5v out 20a max current sharing between two ltm4600hv modules typical application
ltm4600hv 21 4600hvfd notes: 1. dimensioning and tolerancing per asme y14.5m-1994 2. all dimensions are in millimeters land designation per jesd mo-222, spp-010 5. primary datum -z- is seating plane 6. the total number of pads: 104 4 3 details of pad #1 identifier are optional, but must be located within the zone indicated. the pad #1 identifier is a marked feature or a notched beveled pad symbol aaa bbb eee tolerance 0.15 0.10 0.15 2.72 C 2.92 detail b detail b substrate mold cap 0.27 C 0.37 2.45 C 2.55 bbb z z 15 bsc top view 15 bsc 4 pad 1 corner x y aaa z aaa z 13.97 bsc 12.70 bsc 0.11 C 0.27 13.93 bsc 35 24 79 68 11 13 10 12 15 17 14 16 19 21 18 20 22 4600 02-18 bottom view c(0.30) pad 1 3 pads see notes 94 95 96 97 98 99 100 101 102 103 104 93 82 71 60 49 24 23 22 21 20 19 18 17 16 7 6 5 4 3 2 40 51 62 73 84 85 86 87 88 89 90 91 74 75 76 77 78 79 80 63 64 65 66 67 68 69 52 53 54 55 56 57 58 42 43 44 45 46 47 92 81 70 59 48 11 10 9 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 41 1 8 12 25 32 39 50 61 72 83 m y x eee 1 suggested solder pad layout top view 94 95 96 97 98 99 100 101 102 103 104 93 82 71 60 49 24 23 22 21 20 19 18 17 16 7 6 5 4 3 2 40 51 62 73 84 85 86 87 88 89 90 91 74 75 76 77 78 79 80 63 64 65 66 67 68 69 52 53 54 55 56 57 58 42 43 44 45 46 47 92 81 70 59 48 11 10 9 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 41 1 8 12 25 32 39 50 61 72 83 0.0000 1.2700 2.5400 0.3175 0.3175 4.4450 5.7150 6.9850 1.4675 5.7158 6.9421 4.4458 6.3500 6.3500 3.8100 3.8100 1.2700 0.3175 0.3175 0.0000 1.2700 3.1758 1.9058 0.6358 0.0000 0.6342 1.9042 3.1742 4.4442 5.7142 6.9865 2.7375 4.0075 5.2775 6.5475 6.9888 1.0900 2.3600 4.4950 5.7650 5.0800 5.0800 2.5400 2.5400 23 a b c d e f g h j l m n p r t k lga package 104-lead (15mm 15mm) (reference ltm dwg # 05-05-1800) package description
ltm4600hv 22 4600hvfd pin name pin name pin name pin name pin name pin name pin name pin name a1 - b1 v in c1 - d1 v in e1 - f1 v in g1 pgnd h1 - a2 - b2 - c2 - d2 - e2 - f2 - g2 - h2 - a3 v in b3 - c3 - d3 - e3 - f3 - g3 - h3 - a4 - b4 - c4 - d4 - e4 - f4 - g4 - h4 - a5 v in b5 - c5 - d5 - e5 - f5 - g5 - h5 - a6 - b6 - c6 - d6 - e6 - f6 - g6 - h6 - a7 v in b7 - c7 - d7 - e7 - f7 - g7 - h7 pgnd a8 - b8 - c8 - d8 - e8 - f8 - g8 - h8 - a9 v in b9 - c9 - d9 - e9 - f9 - g9 - h9 pgnd a10 - b10 - c10 v in d10 - e10 v in f10 - g10 - h10 - a11 v in b11 - c11 - d11 - e11 - f11 - g11 - h11 pgnd a12 - b12 - c12 v in d12 - e12 v in f12 - g12 - h12 - a13 v in b13 - c13 - d13 - e13 - f13 - g13 - h13 pgnd a14 - b14 - c14 v in d14 - e14 v in f14 - g14 - h14 - a15 f adj b15 - c15 - d15 - e15 - f15 - g15 - h15 pgnd a16 - b16 - c16 - d16 - e16 - f16 - g16 - h16 - a17 sv in b17 - c17 - d17 - e17 - f17 - g17 - h17 pgnd a18 - b18 - c18 - d18 - e18 - f18 - g18 - h18 - a19 extv cc b19 - c19 - d19 - e19 - f19 - g19 - h19 - a20 - b20 - c20 - d20 - e20 - f20 - g20 - h20 - a21 v oset b21 - c21 - d21 - e21 - f21 - g21 - h21 - a22 - b22 - c22 - d22 - e22 - f22 - g22 - h22 - a23 - b23 comp c23 - d23 sgnd e23 - f23 run/ss g23 fcb h23 - pin name pin name pin name pin name pin name pin name pin name pin name j1 pgnd k1 - l1 - m1 - n1 - p1 - r1 - t1 - j2 - k2 - l2 pgnd m2 pgnd n2 pgnd p2 v out r2 v out t2 v out j3 - k3 - l3 - m3 - n3 - p3 - r3 - t3 - j4 - k4 - l4 pgnd m4 pgnd n4 pgnd p4 v out r4 v out t4 v out j5 - k5 - l5 - m5 - n5 - p5 - r5 - t5 - j6 - k6 - l6 pgnd m6 pgnd n6 pgnd p6 v out r6 v out t6 v out j7 - k7 pgnd l7 - m7 - n7 - p7 - r7 - t7 - j8 - k8 l8 pgnd m8 pgnd n8 pgnd p8 v out r8 v out t8 v out j9 - k9 pgnd l9 - m9 - n9 - p9 - r9 - t9 - j10 - k10 l10 pgnd m10 pgnd n10 pgnd p10 v out r10 v out t10 v out j11 - k11 pgnd l11 - m11 - n11 - p11 - r11 - t11 - j12 - k12 - l12 pgnd m12 pgnd n12 pgnd p12 v out r12 v out t12 v out j13 - k13 pgnd l13 - m13 - n13 - p13 - r13 - t13 - j14 - k14 - l14 pgnd m14 pgnd n14 pgnd p14 v out r14 v out t14 v out j15 - k15 pgnd l15 - m15 - n15 - p15 - r15 - t15 - j16 - k16 - l16 pgnd m16 pgnd n16 pgnd p16 v out r16 v out t16 v out j17 - k17 pgnd l17 - m17 - n17 - p17 - r17 - t17 - j18 - k18 - l18 pgnd m18 pgnd n18 pgnd p18 v out r18 v out t18 v out j19 - k19 - l19 - m19 - n19 - p19 - r19 - t19 - j20 - k20 - l20 pgnd m20 pgnd n20 pgnd p20 v out r20 v out t20 v out j21 - k21 - l21 - m21 - n21 - p21 - r21 - t21 - j22 - k22 - l22 pgnd m22 pgnd n22 pgnd p22 v out r22 v out t22 v out j23 pgood k23 - l23 - m23 - n23 - p23 - r23 - t23 - pin assignment tables (arranged by pin number) package description
ltm4600hv 23 4600hvfd 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. pin name g1 pgnd h7 h9 h11 h13 h15 h17 pgnd pgnd pgnd pgnd pgnd pgnd j1 pgnd k7 k9 k11 k13 k15 k17 pgnd pgnd pgnd pgnd pgnd pgnd l2 l4 l6 l8 l10 l12 l14 l16 l18 l20 l22 pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd m2 m4 m6 m8 m10 m12 m14 m16 m18 m20 m22 pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd n2 n4 n6 n8 n10 n12 n14 n16 n18 n20 n22 pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pin name p2 p4 p6 p8 p10 p12 p14 p16 p18 p20 p22 v out v out v out v out v out v out v out v out v out v out v out r2 r4 r6 r8 r10 r12 r14 r16 r18 r20 r22 v out v out v out v out v out v out v out v out v out v out v out t2 t4 t6 t8 t10 t12 t14 t16 t18 t20 t22 v out v out v out v out v out v out v out v out v out v out v out pin name a3 a5 a7 a9 a11 a13 v in v in v in v in v in v in b1 v in c10 c12 c14 v in v in v in d1 v in e10 e12 e14 v in v in v in f1 v in pin name a15 f adj a17 sv in a19 extv cc a21 v oset b23 comp d23 sgnd f23 run/ss g23 fcb j23 pgood pin assignment tables (arranged by pin number) package description
ltm4600hv 24 4600hvfd ? linear technology corporation 2005 lt 0807 rev d ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com 1 . 8v , 10a r egu l a t or 4600hv ta04 c1, c2: taiyo yuden, gdk316bj106ml c3: taiyo yuden, jmk316bj226ml-t501 c4: sanyo poscap , 4tpe470mcl 1.8v at 10a 4.5v to 22v r1 100k extv cc run comp fcb v out pgood v oset sv in pgnd sgnd c1 10 + f 35v c2 10 + f 35v c5 100pf c4 470 + f 4v pgood c3 22 + f x3 v in ltm4600hv f adj r2 49.9k 1% + this product contains technology licensed from silicon semiconductor corporation. ? part number description comments ltc2900 quad supply monitor with adjustable reset timer monitors four supplies; adjustable reset timer ltc2923 power supply tracking controller tracks both up and down; power supply sequencing lt3825/lt3837 synchronous isolated flyback controllers no optocoupler required; 3.3v, 12a output; simple design ltm4600 10a dc/dc module basic 10a dc/dc module ltm4601 12a dc/dc module with pll, output tracking/ margining and remote sensing synchronizable, polyphase operation to 48a, ltm4601-1 version has no remote sensing ltm4602 6a dc/dc module pin compatible with the ltm4600 ltm4603 6a dc/dc module with pll and outpupt tracking/ margining and remote sensing synchronizable, polyphase operation to 48a, ltm4601-1 version has no remote sensing, pin compatible with the ltm4601 typical application related parts

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