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1 load current (a) 0 efficiency (%) 6 4600hv ta01b 2 4 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 effciency dc/dc module the lt m ? 4600hv is a complete 10 a, dc/dc step down power supply with up to 28 v input operation. included in the package are the switching controller, power fets, inductor, and all support components. operating over an input voltage range of 4.5 v to 28 v, the ltm4600hv supports an output voltage range of 0.6 v to 5 v, set by a single resistor. this high efficiency design delivers 10a continuous current (12 a peak), needing no heat sinks or airflow to meet power specifications. only bulk input and output capacitors are needed to finish the design. the low profile package (2.82 mm) 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 sacrificing 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 compact (15mm 15mm) and low profile (2.82 mm) over-molded land grid array ( lga) package suitable for automated assembly by standard surface mount equipment. the ltm4600hv is 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 tw o 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 (ltm4600hvmp v) n rohs compliant package with gold pad finish (e4) n up to 92% efficiency n programmable soft-start n output overvoltage protection n optional short-circuit shutdown timer n small footprint, low profile (15mm 15mm 2.82mm) lga package 10a module power supply with 4.5v to 28v input efficiency 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 , lt c , lt m , module and opti-loop are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. typical a pplica t ion a pplica t ions fea t ures descrip t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
2 fcb , extv cc , pgood , run / ss , v out ......... C0.3 v to 6v v in , sv in , f adj ............................................ C0. 3 v to 28 v v oset , comp ............................................ C 0.3 v to 2.7 v operating temperature range ( note 2) e and i grades ..................................... C 40 c to 85 c mp g rade ........................................... C 55 c to 125 c junction temperature ........................................... 12 5 c storage temperature range .................. C 55 c to 125 c peak solder reflow body temperature ................. 245 c 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 2.82mm) top view t jmax = 125c, e ja = 15c/w, e jc = 6c/w, e ja derived from 95mm = 76mm pcb with 4 layers, weight = 1.7g p in c on f igura t ion a bsolu t e maxi m u m r a t ings o r d er i n f or m a t ion part number pad or ball finish part marking package type msl ra ting temperature range (see note 2) device finish code ltm4600hvev#pbf au (rohs) ltm4600hvev e4 lga 3 C40c to 85c ltm4600hviv#pbf ltm4600hviv C40c to 85c ltm4600hvmpv#pbf ltm4600hvmpv C55c to 125c ? consult marketing for parts specified with wider operating temperature ranges. *pad or ball finish code is per ipc/jedec j-std-609. ? terminal finish part marking: www.linear.com/leadfree ? recommended lga and bga pcb assembly and manufacturing procedures: www.linear.com/umodule/pcbassembly ? lga and bga package and tray drawings: www.linear.com/packaging (note 1) ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
3 symbol parameter conditions min typ max units v in(dc) input dc voltage abs max 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 specifications 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 t ime 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 = 24 v to 3.3 v at 10a , extv cc = 5v 1.52 3.13 3.64 1.6 a a a a output specifications 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 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 % 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 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 t able 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 the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, v in = 12v. external c in = 120f, c out = 200f/ceramic per typical application (front page) configuration. e lec t rical c harac t eris t ics ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
4 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 specifications from 0c to 85c. specifications over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. the ltm4600hvi is guaranteed over the C40c to 85c temperature range. the ltm46000hvmp is guaranteed and tested over the C55c to 125c temperature range. note 3: for output current derating at high temperature, please refer to thermal considerations and output current derating discussion. note 4: test assumes current derating versus temperature. note 5: guaranteed by correlation. symbol parameter conditions min typ max units 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 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 v oseth pgood upper threshold v oset rising 7.5 10 12.5 % v osetl pgood lower threshold v oset falling C7.5 C10 C12.5 % 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 specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, v in = 12v. external c in = 120f, c out = 200f/ceramic per typical application (front page) configuration. e lec t rical c harac t eris t ics ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
5 efficiency vs load current with 5v in (fcb = 0) efficiency vs load current with 12v in (fcb = 0) efficiency vs load current with 24v in (fcb = 0) efficiency vs load current with different fcb settings 1.2 v transient response 1.5 v transient response 1.8v transient response 2.5v transient response 3.3v transient response (see figure 21 for all curves) typical p er f or m ance c harac t eris t ics load current (a) 0 100 90 80 70 60 50 40 30 6 4600hv g01 2 4 8 10 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 2 4 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 2 4 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 25s/div 4600hv g05 1.2v 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 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 g09 3.3v 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 ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
6 start -up, i out = 0a start-up, i out = 10a (resistive load) short -circuit protection, i out = 0a short-circuit protection, i out = 10a v in to v out step-down ratio (see figure 21 for all curves) v oset vs temperature start-up waveform, t a = C55c typical p er f or m ance c harac t eris t ics 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 5 15 4600hv g14 10 2420 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) ?55 0.590 v oset (v) 0.595 0.600 0.605 0.610 ?25 5 35 65 4600hv g15 95 125 v in = 12v v out = 1.5v i out = 10a 400s/div 4600hv g16 12v input load regulation vs temperature load current 0 ?0.45 load regulation % ?0.40 ?0.35 ?0.10 ?0.15 ?0.20 ?0.25 ?0.30 ?0.05 0.00 5 4600hv g17 10 25c 100c ?45c 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) 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 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) ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
7 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 110 k resistor from v in to this pin sets the one-shot timer current, thereby setting the switch- ing frequency. the ltm4600hv switching frequency is typically 850 khz. 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 a 17): supply pin for internal pwm controller. leave this pin open or add additional decoupling capacitance. extv cc ( pin a19): external 5 v supply pin for controller. if left open or grounded, the internal 5 v 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 a 21): the negative input of the error amplifier. internally, this pin is connected to v out with a 100 k preci - sion 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 amplifier compensation point. the current comparator threshold increases with this control voltage. the voltage ranges from 0 v to 2.4 v with 0.8 v 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 0.8 v will shut down the power supply. inside the power module, there is a 1000 pf capacitor which provides approximately 0.7 ms 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. the run/ss pin has an internal 6v zener to ground. fcb ( pin g23): forced continuous input. grounding this pin enables forced continuous mode operation regardless of load conditions. tying this pin above 0.63 v enables discontinuous conduction mode to achieve high efficiency operation at light loads. there is an internal 4.75 k 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) p in func t ions 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 3 5 2 4 7 9 6 8 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 1918171676543 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 11109 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 4600hvfe for more information www.linear.com/ltm4600hv
8 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 configuration. figure 1. simplified ltm4600hv block diagram s i m pli f ie d b lock diagra m 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 1.5f c in 15f 6.3v c out 10 int comp controller decoupling r equire m en t s ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
9 module description the ltm4600hv is a standalone non- isolated synchronous switching dc/dc power supply. it can deliver up to 10 a 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 4.5 v to 28v. a simplified block diagram is shown in figure 1 and the typical application schematic is shown in figure 21. the ltm4600hv contains an integrated lt c 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 850 khz at full load. with current mode control and internal feedback loop compensation, the ltm4600hv module has sufficient 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 over voltage 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 1.2 a current source to charge up the soft-start 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 efficiency when the fcb pin is pulled up above 0.8 v and no higher than 6v. the fcb pin has a 4.75 k 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 4.7 v 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 24 v operation to lower temperature in the module. o pera t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
10 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 up ) ? v o ? (1 + m%) (r set r up ) + 100k = 0.6v r set ? v o ? (1C m%) r set + (100k r down ) = 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 in 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, % is the estimated efficiency 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), 10 f ceramic capacitors are recommended. this decoupling capacitor should be placed directly adjacent the module input pins the typical ltm4600hv application circuit is shown in figure 21. external component selection is primarily de - termined b y t he 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 100 k/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 set table 1 shows the standard values of 1% r set resistor for typical output voltages: table 1. r set (k) 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 voltage is margined up. the output voltage is margined 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 a pplica t ions i n f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
11 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 sufficient stability margin for all ceramic capacitors applications. additional output filtering 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 5 a/s transient with a specific 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 condition, 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. v in to v out step-down 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 constraints are shown in v in to v out step-down ratio in the typical performance characteristics section. note that additional thermal derating may apply. see the thermal considerations and output current derating sec - tions of this data sheet. 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 0.8 v puts the ltm4600hv into a low quiescent current shutdown (i q 75 a). releasing the pin allows an internal 1.2a current source to charge up the timing capacitor c ss . inside ltm4600hv, there is an internal 1000 pf capacitor 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 1.2a ? (c ss _ ext + 1000pf) when the voltage on run/ss pin reaches 1.5 v, the ltm4600hv internal switches are operating with a clamp- ing of the maximum output inductor current limited by the run/ss pin total soft-start capacitance. as the run/ ss pin voltage rises to 3 v, the soft-start clamping of the inductor current is released. applica t ions in f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
12 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) recover y 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 1 100 f 6.3v 470 f 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 10 f 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. a pplica t ions i n f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
13 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 4 v, if the output voltage falls below 75% of its regulated value, then a short-circuit fault is assumed. a 1.8 a current then begins discharging c ss . if the fault condition persists until the run/ss pin drops to 3.5 v, then the controller turns off both power mosfets, shutting 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 4 v 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 10kv generally 0.1f is more than sufficient. since the load current is already limited by the current mode control and current foldback circuitry during a short- circuit, 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. using a resistor from run/ss pin to v in is a simple solu- tion to defeat latchoff. any pull-up network must be able to maintain run/ss above 4v maximum latchoff threshold and overcome the 4 a maximum discharge current. with a pull- up resistor, the delay before starting is approximately: t delay = Cr run/ss ? c ss _ ext + 1000pf ( ) ? ln 1 ? 1.5v v in + 1.2a ? r run/ss ( ) ? ? ? ? ? ? ? ? figure 3 shows a conceptual drawing of v run during startup and short-circuit. 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 applica t ions in f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
14 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 5 v power rail, the ltm4600hv can be directly powered by v in . the gate driver current through ldo is about 18 ma. 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 5 v rail in the system, it is recommended to connect extv cc pin to the external 5v rail. whenever the extv cc pin is above 4.7 v, the in- ternal 5 v ldo is shut off and an internal 50 ma p-channel switch connects the extv cc to internal 5 v. internal 5 v is supplied from extv cc until this pin drops below 4.5 v. do not apply more than 6 v to the extv cc pin and ensure that extv cc < v in . the following list summaries the possible connections for extv cc : 1. extv cc grounded. internal 5 v ldo is always powered from the internal 5v regulator. 2. extv cc connected to an external supply. internal ldo is shut off. a high efficiency supply compatible with the mosfet gate drive requirements (typically 5 v) can im - prove overall efficiency. 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 4.75 k 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. a pplica t ions i n f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
15 explanation of the analysis for the thermal models, and the derating curves. tables 3 and 4 provide a summary of the equivalent ja for the noted conditions. these equivalent ja parameters are correlated to the measure values, and improved with air- flow. the case temperature is maintained at 100 c or below for the derating curves. this allows for 4w maximum power dissipation in the total module with top and bottom heat sinking, and 2 w power dissipation through the top of the module with an approximate jc between 6 c/w to 9 c/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 efficiency is im - portant, tying the fcb pin above 0.6 v threshold enables discontinuous operation where the bottom mosfet turns off when inductor current reverses. therefore, the conduc - tion loss is minimized and light load efficiency 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 tw o or more ltm4600hv modules can be paralleled to provide higher than 10 a 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 set where n is the number of ltm4600hvs in parallel. figure 7. parallel tw o 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 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 ja for the module with various heat sink- ing methods . thermal models are derived from several temperature measurements at the bench, and thermal modeling analysis. application note 103 provides a detailed applica t ions in f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
16 figure 12. bga heat sink figure 11. no heat sink figure 10. bga heat sink figure 9. no heat sink figure 8. 1.5v power loss curves vs load current figure 14. bga heat sink figure 13. no heat sink figure 15. 3.3v power loss curves vs load current figure 16. no heat sink a pplica t ions i n f or m a t ion output current (a) 0 86 4600hv f08 2 4 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) 0 86 4600hv f15 2 4 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 6050 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 4600hvfe for more information www.linear.com/ltm4600hv
17 figure 17. bga heat sink figure 19. bga heat sink figure 18. no heat sink table 4. 3.3v output derating curve v in (v) power loss curve air flow (lfm) heat sink 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 heat sink 13.9 figures 17, 19 12, 24 figure 15 200 bga heat sink 11.1 figures 17, 19 12, 24 figure 15 400 bga heat sink 10.5 table 3. 1.5v output derating curve v in (v) power loss curve air flow (lfm) heat sink 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 heat sink 13.9 figures 10, 12, 14 5, 12, 18 figure 8 200 bga heat sink 11.3 figures 10, 12, 14 5, 12, 18 figure 8 400 bga heat sink 10.25 applica t ions in f or m a t ion 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 4600hvfe for more information www.linear.com/ltm4600hv
18 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 1000 pf 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 10 pf capacitor that establishes a ramp that is compared to a voltage threshold equal to the output voltage up to a 2.4 v clamp. this i on current is equal to: i on = (v in C 0.7 v)/110k, with the 110 k 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 2.4 v. 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 2.4 v 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 3.3 v and 5 v outputs. this is due to the fact the on time will not increase as v out increases past 2.4 v. therefore, if the nominal switch- ing frequency is 850 khz, then the switching frequency will increase to ~1.2 mhz for 3.3 v, and ~1.7 mhz for 5v outputs due to frequency = (dc/t on ) when the switching frequency increases to 1.2 mhz, 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 5 v to 3.3 v and 12 v to 5 v need to be accommodated, then the switching frequency can be lowered to alleviate the violation of the 400 ns minimum off time. since the total switching period is t s = t on + t off , t off will be below the 400 ns 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 . 12 v to 5 v and 5 v 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 = 1.79 mhz; 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 a pplica t ions i n f or m a t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
19 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 ? 1 0 pf]) ? dc, solve for i on = (1mhz ? 2.4v ? 1 0 pf) ? (1/0.41) @ 58 a. i on current calculated from 12 v input was 103 a, so a resistor from f adj to ground = (0.7 v/15k ) = 46a. 103a C 46a = 57a, sets the adequate i on current for proper frequency range for the higher duty cycle conversion of 12 v to 5v. input voltage range is limited to 9 v to 16 v. higher input voltages can be used without the 15 k on f adj . the inductor ripple current gets too high above 16 v, 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 = 1.07 mhz; 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 2.22 s period is chosen for 5 v to 3.3v. frequency range is about 450 khz to 650 khz 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 ? 1 0 pf]) ? dc, solve for i on = (450 khz ? 2.4v ? 10 pf ) ? (1/0.66) @ 16 a. i on current calculated from 5 v input was 39 a, 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 4.5 v to 7 v . higher input voltages can be used without the 30.1 k on f adj . the inductor ripple current gets too high above 7 v, and the 400 ns minimum off-time is limited below 4.5v. 5v to 3.3v at 8a applica t ions in f or m a t ion 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 10f 25v c3 10f 25v c4 330f 6.3v c2 22f c5 100pf v in ltm4600hv f adj run/soft-start open drain efficiency = 94% + ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
20 figure 21. typical application, 5v to 24v input, 0.6v to 5v output, 10a max v in to v out step-down ratio for 12v to 5v and 5v to 3.3v 12v to 5v at 8a a pplica t ions i n f or m a t ion 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 10f 25v c3 10f 25v c4 330f 6.3v c2 22f c5 100pf v in ltm4600hv f adj run/soft-start open drain + v in (v) 4600 f24 1 3 5 7 9 11 13 15 17 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 22f 6.3v 3 refer to table 2 c out2 470f 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) 10f 2x c in (bulk) 150f c3 100pf r1 66.5k refer to table 1 v in (multiple pins) ltm4600hv sv in + + typical a pplica t ions ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
21 parallel operation and load sharing 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 10f 35v c8 10f 35v c10 470f 4v c9 22f x3 v in ltm4600hv f adj r1 100k extv cc run comp fcb v out pgood v oset sv in pgnd sgnd c1 10f 35v run/soft-start c3 10f 35v c4 220pf c5 470f 4v c2 22f 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 tw o ltm4600hv modules typical a pplica t ions ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
22 lga package 104-lead (15mm 15mm 2.82mm) (reference ltm dwg # 05-05-1800 rev c) p ackage descrip t ion please refer to http://www .linear.com/designtools/packaging/ for the most recent package drawings. 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 ? 2.92 detail b detail b substrate mold cap 0.27 ? 0.37 2.45 ? 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 ? 0.27 13.93 bsc 3 5 2 4 7 9 6 8 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 1918171676543 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 11109 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 yxeee 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 1817 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 7 package row and column labeling may vary among module products. review each package layout carefully ! 7 see notes lga 104 1112 rev c ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
23 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 h 1 - a 2 - b 2 - c 2 - d 2 - e 2 - f 2 - g 2 - h 2 - a3 v in b3 - c3 - d 3 - e 3 - f 3 - g 3 - h 3 - a 4 - b 4 - c4 - d 4 - e 4 - f 4 - g 4 - h 4 - a5 v in b5 - c5 - d 5 - e 5 - f 5 - g 5 - h 5 - a6 - b 6 - c 6 - d 6 - e 6 - f 6 - g 6 - h 6 - a7 v in b7 - c7 - d 7 - e 7 - f 7 - g 7 - h7 pgnd a8 - b 8 - c 8 - d 8 - e 8 - f 8 - g 8 - h 8 - a9 v in b9 - c9 - d 9 - e 9 - f 9 - g9 - h9 pgnd a10 - b 10 - c10 v in d10 - e10 v in f10 - g10 - h 10 - a11 v in b11 - c11 - d 11 - e 11 - f 11 - g 11 - h11 pgnd a12 - b 12 - c12 v in d12 - e12 v in f12 - g12 - h 12 - a13 v in b13 - c13 - d 13 - e 13 - f 13 - g 13 - h13 pgnd a14 - b 14 - c14 v in d14 - e14 v in f14 - g14 - h 14 - a15 f adj b15 - c15 - d 15 - e 15 - f 15 - g 15 - h15 pgnd a16 - b 16 - c 16 - d 16 - e 16 - f 16 - g 16 - h 16 - a17 sv in b17 - c17 - d 17 - e 17 - f 17 - g 17 - h17 pgnd a18 - b 18 - c18 - d 18 - e 18 - f 18 - g 18 - h 18 - a19 extv cc b19 - c19 - d 19 - e 19 - f 19 - g 19 - h 19 - a 20 - b 20 - c 20 - d 20 - e 20 - f 20 - g 20 - h 20 - a21 v oset b21 - c21 - d21 - e 21 - f 21 - g 21 - h 21 - a 22 - b 22 - c 22 - d 22 - e 22 - f 22 - g 22 - h 22 - a 23 - b23 comp c 23 - d23 sgnd e 23 - f23 run/ss g23 fcb h 23 - pin name pin name pin name pin name pin name pin name pin name pin name j1 pgnd k1 - l 1 - m 1 - n 1 - p 1 - r 1 - t 1 - j 2 - k 2 - l2 pgnd m2 pgnd n2 pgnd p2 v out r2 v out t2 v out j3 - k3 - l 3 - m 3 - n 3 - p 3 - r 3 - t 3 - j 4 - k 4 - l4 pgnd m4 pgnd n4 pgnd p4 v out r4 v out t4 v out j5 - k5 - l 5 - m 5 - n 5 - p 5 - r 5 - t 5 - j 6 - k 6 - l6 pgnd m6 pgnd n6 pgnd p6 v out r6 v out t6 v out j7 - k7 pgnd l 7 - m 7 - n 7 - p 7 - r 7 - t 7 - j 8 - k8 l8 pgnd m8 pgnd n8 pgnd p8 v out r8 v out t8 v out j9 - k9 pgnd l 9 - m9 - n 9 - p 9 - r 9 - t 9 - j 10 - k10 l10 pgnd m10 pgnd n10 pgnd p10 v out r10 v out t10 v out j11 - k11 pgnd l 11 - m 11 - n 11 - p 11 - r 11 - t 11 - j 12 - k12 - l12 pgnd m12 pgnd n12 pgnd p12 v out r12 v out t12 v out j13 - k13 pgnd l 13 - m 13 - n 13 - p 13 - r 13 - t 13 - j 14 - k 14 - l14 pgnd m14 pgnd n14 pgnd p14 v out r14 v out t14 v out j15 - k15 pgnd l 15 - m 15 - n 15 - p15 - r 15 - t 15 - j 16 - k 16 - l16 pgnd m16 pgnd n16 pgnd p16 v out r16 v out t16 v out j17 - k17 pgnd l 17 - m 17 - n 17 - p 17 - r 17 - t 17 - j 18 - k18 - l18 pgnd m18 pgnd n18 pgnd p18 v out r18 v out t18 v out j19 - k19 - l 19 - m 19 - n 19 - p 19 - r 19 - t 19 - j 20 - k20 - l20 pgnd m20 pgnd n20 pgnd p20 v out r20 v out t20 v out j21 - k21 - l 21 - m 21 - n 21 - p 21 - r 21 - t 21 - j 22 - k 22 - l22 pgnd m22 pgnd n22 pgnd p22 v out r22 v out t22 v out j23 pgood k 23 - l 23 - m 23 - n 23 - p 23 - r 23 - t 23 - pin assignment tables (arranged by pin number) package d escrip t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
24 pin name g1 pgnd h7 h9 h11 h13 h15 h17 pgnd pgnd pgnd pgnd pgnd pgnd j 1 pgnd k7 k9 k11 k13 k15 k17 pgnd pgnd pgnd pgnd pgnd pgnd l 2 l4 l6 l8 l10 l12 l14 l16 l18 l20 l22 pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd m 2 m4 m6 m8 m10 m12 m14 m16 m18 m20 m22 pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd pgnd n 2 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 d escrip t ion ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
25 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. r evision h is t ory rev date description page number e 5/14 added reflow temperature. updated the order table. updated notes. updated the soft-start and latchoff section. 2 2 4 11, 13 (revision history begins at rev e) ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv
26 ? linear technology corporation 2005 lt 0514 rev e ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/ltm4600hv 1.8v, 10a regulator 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 10f 35v c2 10f 35v c5 100pf c4 470f 4v pgood c3 22f x3 v in ltm4600hv f adj r2 49.9k 1% + this product contains technology licensed from silicon semiconductor corporation. ? typical a pplica t ion r ela t e d p ar t s part number description comments ltm4649 16v in , 10a step-down module regulator 4.5v v in 16v, 0.6v v out 3.3v, pll input, remote sense amplifier, v out tracking, 9mm 15mm x 4.92mm bga ltm4641 38v in , 10a step-down module regulator with advanced input & load protection 4.5v v in 38v, 0.6v v out 6v, adjustable protection trip thresholds for many faults: (output overvoltage, input overvoltage, input undervoltage, overtemperature), 15mm 15mm 5.01mm bga ltm4633 triple 10a, 16v in step-down dc/dc module regulator 4.7v v in 16v, 0.8v v out1,2 1.8v, 0.8v v out3 5.5v, pll input, v out soft-start and tracking, pgood, internal temperature monitor, 15mm 15mm 5.01mm bga ltm4627 20v in , 15a dc/dc step-down module regulator 4.5v v in 20v, 0.6v v out 5v, pll input, v out tracking, remote sense amplifier, 15mm 15mm 4.32mm lga or 15mm 15mm 4.92mm bga ltm4611 1.5v in(min) , 15a dc/dc step-down module regulator 1.5v v in 5.5v, 0.8v v out 5v, pll input, remote sense amplifier, v out tracking, 15mm 15mm 4.32mm lga ltm4613 36v in , 8a en55022 class b dc/dc step-down module regulator 5 v v in 36v, 3.3v v out 15v, pll input, v out tracking and margining, 15mm 15mm 4.32mm lga ltm8061 32v , 2 a step-down module battery charger with programmable input current limit compatible with single cell or dual cell li-ion or li-poly battery stacks (4.1v, 4.2v, 8.2v, or 8.4v), 4.95v v in 32v, c/10 or adjustable timer charge termination, ntc resistor monitor input, 9mm 15mm 4.32mm lga ltm8045 inverting or sepic module dc/dc converter with up to 700ma output current 2.8v v in 18v, 2.5v v out 15v, synchronizable, no derating or logic level shift for control inputs when inverting, 6.25mm 11.25mm 4.92mm bga ltm8048 1.5w, 725vdc galvanically isolated module converter with ldo post regulator 3.1v v in 32v, 2.5v v out 12v, 1mv p-p output ripple, internal isolated transformer, 9mm 11.25mm 4.92mm bga ltc2977 8-channel pmbus power system manager 0.25% tue 16-bit adc, voltage/temperature monitoring and supervision ltc2974 4-channel pmbus power system manager 0.25% tue 16-bit adc, voltage/current/temperature monitoring and supervision ltm4600hv 4600hvfe for more information www.linear.com/ltm4600hv

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