LTM4600HVIV-PBF

LTM4600HV LINER | Alldatasheet

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, LTC, LT and LTM are registered trademarks of Linear Technology Corporation. μModule is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. LOAD CURRENT (A) EFFICIENCY (%) 4600HV TA01b 24 8 10 100 1.8VOUT 2.5VOUT 3.3VOUT 5VOUT 10A, 28VIN High Effi ciency DC/DC µModule 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 effi ciency design delivers 10A continuous current (12A peak), needing no heat sinks or airfl ow to meet power specifi cations. Only bulk input and output capacitors are needed to fi nish the design. The low profi 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 sacrifi 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 profi 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. ■ Telecom and Networking Equipment ■ Military and Avionics Systems ■ Industrial Equipment ■ Point of Load Regulation ■ Servers ■ Complete Switch Mode Power Supply ■ Wide Input Voltage Range: 4.5V to 28V ■ 10A DC, 12A Peak Output Current ■ Parallel Two μModule™ DC/DC Converters for 20A Output Current ■ 0.6V to 5V Output Voltage ■ 1.5% Output Voltage Regulation ■ Ultrafast Transient Response ■ Current Mode Control ■ –55°C to 125°C Operating Temperature Range (LTM4600HVMPV) ■ Pb-Free (e4) RoHS Compliant Package Gold-Pad Finish ■ Up to 92% Effi ciency ■ Programmable Soft-Start ■ Output Overvoltage Protection ■ Optional Short-Circuit Shutdown Timer ■ Small Footprint, Low Profi le (15mm × 15mm × 2.8mm) LGA Package 10A μModule Power Supply with 4.5V to 28V Input APPLICATIO SU FEATURES DESCRIPTIO U TYPICAL APPLICATIO U Effi ciency vs Load Current with 24VIN (FCB = 0) VIN CIN 4600hv TA01a LTM4600HV PGND SGND VOUT VOSET VIN 4.5V TO 28V ABSMAX VOUT 2.5V* 10ACOUT 31.6k *REVIEW DE-RATING CURVE AT THE HIGHER INPUT VOLTAGE

Operating Temperature Range (Note 2) (Note 1) The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 12V. External CIN = 120μF, COUT = 200μF/Ceramic per typical application (front page) confi guration.

ELECTRICAL CHARACTERISTICS

ABSOLUTE AXI U RATI GSW WW U SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN(DC) Input DC Voltage AbsMax 28V for Tolerance on 24V Inputs ● 4.5 28 V VOUT(DC) Output Voltage FCB = 0V V IN = 5V or 12V, VOUT = 1.5V, IOUT = 0A 1.478 1.470 1.50 1.50 1.522 1.530 V Input Specifi cations V IN(UVLO) Under Voltage Lockout Threshold IOUT = 0A 3.4 4 V IINRUSH(VIN) Input Inrush Current at Startup IOUT = 0A, VOUT = 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 IOUT = 0A, EXTVCC Open V IN = 12V, VOUT = 1.5V, FCB = 5V V IN = 12V, VOUT = 1.5V, FCB = 0V V IN = 24V, VOUT = 2.5V, FCB = 5V V IN = 24V, VOUT = 2.5V, FCB = 0V Shutdown, RUN = 0.8V, V IN = 12V 1.2 1.8 35 75 mA mA mA mA μA Min On Time 100 ns Min Off Time 400 ns I S(VIN) Input Supply Current V IN = 12V, VOUT = 1.5V, IOUT = 10A V IN = 12V, VOUT = 3.3V, IOUT = 10A V IN = 5V, VOUT = 1.5V, IOUT = 10A V IN = 24V to 3.3V at 10A, EXTVCC = 5V 1.52 3.13 3.64 1.6 A A A A PIN CONFIGURATION RUN/SS FCB PGOOD VIN PGND VOUT COMP SGND EXTVCC VOSET fADJ SVIN LGA PACKAGE 104-LEAD (15mm × 15mm × 2.8mm) TOP VIEW TJMAX = 125°C, θJA = 15°C/W, θJC = 6°C/W, θJA DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERS, WEIGHT = 1.7g ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTM4600HVEV#PBF LTM4600HVIV#PBF LTM4600HVMPV#PBF LTM4600HVEV#TRPBF LTM4600HVIV#TRPBF LTM4600HVMPV#TRPBF LTM4600HVEV LTM4600HVIV LTM4600HVMPV 104-Lead (15mm × 15mm × 2.8mm) 104-Lead (15mm × 15mm × 2.8mm) 104-Lead (15mm × 15mm × 2.8mm) –40°C to 85°C –40°C to 85°C –55°C to 125°C Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Output Specifi cations IOUTDC Output Continuous Current Range (See Output Current Derating Curves for Different V IN, VOUT and TA) VIN = 12V, VOUT = 1.5V VIN = 24V, VOUT = 2.5V (Note 3) A A ΔVOUT(LINE) VOUT Line Regulation Accuracy V OUT = 1.5V. FCB = 0V, IOUT = 0A, VIN = 4.5V to 28V

• 0.15 0.3 % ΔVOUT(LOAD) VOUT Load Regulation Accuracy V OUT = 1.5V. FCB = 0V, IOUT = 0A to 10A V IN = 5V V IN = 12V (Note 4) ● ±1.5 VOUT(AC) Output Ripple Voltage V IN = 12V, VOUT = 1.5V, FCB = 0V, IOUT = 0A 10 15 mV P-P fs Output Ripple Vol tage Frequency FCB = 0V, IOUT = 5A, VIN = 12V, VOUT = 1.5V 850 kHz tSTART Turn-On Time V OUT = 1.5V, IOUT = 1A V IN = 12V V IN = 5V 0.5 0.7 ms ms ΔVOUTLS Voltage Drop for Dynamic Load Step V OUT = 1.5V, Load Step: 0A/μs to 5A/μs COUT = 3 • 22μF 6.3V, 470μF 4V POSCAP , See Table 2 36 mV tSETTLE Settling Time for Dynamic Load Step VIN = 12V Load: 10% to 90% to 10% of Full Load 25 μs IOUTPK Output Current Limit Output Voltage in Foldback V IN = 24V, VOUT = 2.5V V IN = 12V, VOUT = 1.5V V IN = 5V, VOUT = 1.5V A A A Control Stage V OSET Voltage at VOSET Pin I OUT = 0A, VOUT = 1.5V ● 0.591 0.594 0.6 0.6 0.609 0.606 V V VRUN/SS RUN ON/OFF Threshold 0.8 1.5 2 V IRUN(C)/SS Soft-Start Charging Current V RUN/SS = 0V –0.5 –1.2 –3 μA IRUN(D)/SS Soft-Start Discharging Current V RUN/SS = 4V 0.8 1.8 3 μA VIN – SVIN EXTVCC = 0V, FCB = 0V 100 mV IEXTVCC Current into EXTVCC Pin EXTV CC = 5V, FCB = 0V, VOUT = 1.5V, IOUT = 0A 16 mA RFBHI Resistor Between VOUT and VOSET Pins 100 k Ω VFCB Forced Continuous Threshold 0.57 0.6 0.63 V IFCB Forced Continuous Pin Current V FCB = 0.6V –1 –2 μA PGOOD Output ΔVOSETH PGOOD Upper Threshold V OSET Rising 7.5 10 12.5 % ΔVOSETL PGOOD Lower Threshold V OSET Falling –7.5 –10 –12.5 % ΔVOSET(HYS) PGOOD Hysteresis V OSET Returning 2 % VPGL PGOOD Low Voltage I PGOOD = 5mA 0.15 0.4 V The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 12V. External CIN = 120μF, COUT = 200μF/Ceramic per typical application (front page) confi 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 specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM46000HVMP is guaranteed and tested over the –55°C to 125°C 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.

LOAD CURRENT (A) EFFICIENCY (%) 4600hv G02 24 8 100 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT Effi ciency vs Load Current with 5VIN (FCB = 0) TYPICAL PERFOR A CE CHARACTERISTICSUW LOAD CURRENT (A) 100 4600hv G01 24 81 0 EFFICIENCY (%) 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT Effi ciency vs Load Current with 12VIN (FCB = 0) Effi ciency vs Load Current with 24V IN (FCB = 0) LOAD CURRENT (A) EFFICIENCY (%) 4600hv G03 24 8 10 100 1.8VOUT 2.5VOUT 3.3VOUT 5VOUT Effi ciency vs Load Current with Different FCB Settings LOAD CURRENT (A) 4600hv G04 EFFICIENCY (%) 0.1 101 FCB = GND FCB > 0.7V VIN = 12V VOUT = 1.5V 1.2V Transient Response 1.5V Transient Response 1.8V Transient Response 2.5V Transient Res ponse 3.3V Transient Res ponse 25μs/DIV 4600hv G05 1.2V AT 5A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 25μs/DIV 4600hv G06 1.5V AT 5A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 25μs/DIV 4600hv G07 1.8V AT 5A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 25μs/DIV 4600hv G08 2.5V AT 5A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 25μs/DIV 4600hv G09 3.3V AT 5A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF VOUT = 50mV/DIV IOUT = 5A/DIV (See Figure 21 for all curves)

VIN (V) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 51 5 4600HV G14 10 24 20 VOUT (V) 3.3V fADJ = OPEN 2.5V 1.8V 1.5V 1.2V 0.6V SEE FREQUENCY ADJUSTMENT DISCUSSION FOR 12VIN TO 5VOUT AND 5VIN TO 3.3VOUT CONVERSION TYPICAL PERFOR A CE CHARACTERISTICSUW Start-Up, IOUT = 0A Start-Up, IOUT = 10A (Resistive Load) Short-Circuit Protection, IOUT = 0A Short-Circuit Protection, IOUT = 10A 200μs/DIV 4600hv G10 VIN = 12V VOUT = 1.5V COUT = 200μF NO EXTERNAL SOFT-START CAPACITOR VOUT (0.5V/DIV) IIN (0.5A/DIV) 200μs/DIV 4600hv G11 VIN = 12V VOUT = 1.5V COUT = 200μF NO EXTERNAL SOFT-START CAPACITOR VOUT (0.5V/DIV) IIN (0.5A/DIV) 20μs/DIV 4600hv G12 VIN = 12V VOUT = 1.5V COUT = 2× 200μF/X5R NO EXTERNAL SOFT-START CAPACITOR VOUT (0.5V/DIV) IIN (0.2A/DIV) 20μs/DIV 4600hv G13 VIN = 12V VOUT = 1.5V COUT = 2× 200μF/X5R NO EXTERNAL SOFT-START CAPACITOR VOUT (0.5V/DIV) IIN (0.5A/DIV) VIN to VOUT Stepdown Ratio (See Figure 21 for all curves) VOSET vs Temperature TEMPERATURE (°C) –55

0.590 VOSET(V)

0.595 0.600 0.605 0.610 –25 5 35 65 4600HV G15 95 125 VIN = 12V VOUT = 1.5V IOUT = 10A 400μs/DIV 4600HV G16 Start-Up Waveform, TA = –55°C

VIN (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. fADJ (Pin A15): A 110k resistor from VIN 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. EXTVCC (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 VIN. VOSET (Pin A21): The Negative Input of The Error Amplifi er. Internally, this pin is connected to VOUT 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 Amplifi 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 200μF 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 5μA 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 effi 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) E C A RUN/SS FCB PGOOD V IN BANK 1 PGND BANK 2 VOUT BANK 3 COMP SGND EXTVCC VOSET fADJ SVIN TOP VIEW 11 13 10 12 15 17 14 16 19 21 18 20 22 94 95 96 97 98 99 100 101 102 103 104 19181716765432 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 11109 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 1 23 B D F G H J L M N P R T K 4600hv PN01

T A = 25°C, VIN = 12V. Use Figure 1 confi guration. Figure 1. Simplifi ed LTM4600HV Block Diagram

μModule 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 5.0VDC. The input voltage range is 4.5V to 28V. A simplifi 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 suffi 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 1.2μA 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 effi 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 EXTVCC 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 EXTVCC voltage should never be higher than the VIN voltage. Also EXTV CC must be sequenced after V IN. Recommended for 24V operation to lower temperature in the μModule.

APPLICATIO S I FOR ATIOWU UU 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 200μF if all ceramic output capacitors are used. The internally optimized loop compensation provides suffi cient stability margin for all ceramic capacitors applications. Additional output fi 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/μs transient with a specifi 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 Q ≤ 75μA). Releasing the pin allows an internal 1.2μA 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 V A Cp FDELAY SS EXT= μ +15 12 1000. . ( ) _ When the voltage on RUN/SS pin reaches 1.5V, 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 3V, the soft-start clamping of the inductor current is released. V IN to VOUT Stepdown Ratios There are restrictions in the maximum V IN to VOUT 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.

**Table 2. Output Voltage Response Versus Component Matrix *(Refer to Figure 21)** *X7R is recommended for extended temperature range.

400 LFM

200 LFM

0 LFM

Figure 12. BGA Heatsink Figure 11. No Heatsink Figure 10. BGA Heatsink Figure 9. No Heatsink Figure 8. 1.5V Power Loss Curves Figure 14. BGA Heatsink Figure 13. No Heatsink Figure 15. 3.3V Power Loss Figure 16. No Heatsink

Figure 17. BGA Heatsink

0 LFM10

Figure 19. BGA Heatsink Figure 18. No Heatsink Table 4. 3.3V Output Table 3. 1.5V Output

Figure 20. Recommended PCB Layout chitecture is constant on time valley mode current control.

• 10pF and tOFF = ts – tON. The frequency is equal to: Freq. = DC/tON. The ION current is proportional to VIN, and the regulator duty cycle is inversely proportional to VIN, 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 VOUT 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 = (VOUT/ION) • 10pF and tOFF = ts – tON. The frequency is equal to: Frequency = DC/tON). 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 VOUT/2.4V for 3.3V and 5V outputs. This is due to the fact the on time will not increase as VOUT increases past 2.4V. Therefore, if the nominal switch- ing frequency is 850kHz, then the switching frequency will increase to ~1.2MHz for 3.3V, and ~1.7MHz for 5V outputs due to Frequency = (DC/t ON) When the switching frequency increases to 1.2MHz, then the time period tS 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 = tON + tOFF, tOFF will be below the 400ns minimum off time. A resistor from the fADJ 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 = (VIN – 0.7V)/110k; ION = 103μA frequency = (I ON/[2.4V • 10pF]) • DC = 1.79MHz; DC = duty cycle, duty cycle is (VOUT/VIN) t S = t ON + t OFF, tON = on-time, t OFF = off-time of the switching period; tS = 1/frequency tOFF must be greater than 400ns, or tS – tON > 400ns. t ON = DC • tS 1MHz frequency or 1μs period is chosen for 12V to 5V. tOFF PERIOD ts tON

4602 F25

APPLICATIO S I FOR ATIOWU UU t ON = 0.41 • 1μs ≅ 410ns t OFF = 1μs – 410ns ≅ 590ns tON and tOFF are above the minimums with adequate guard band. Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for ION = (1MHz • 2.4V • 10pF) • (1/0.41) ≅ 58μA. ION current calculated from 12V input was 103μA, so a resistor from f ADJ to ground = (0.7V/15k) = 46μA. 103μA – 46μA = 57μA, sets the adequate ION 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 = (VIN – 0.7V)/110k; ION = 39μA frequency = (I ON/[2.4V • 10pF]) • DC = 1.07MHz; DC = duty cycle, duty cycle is (VOUT/VIN) t S = t ON + t OFF, tON = on-time, t OFF = off-time of the switching period; tS = 1/frequency tOFF must be greater than 400ns, or tS – tON > 400ns. t ON = DC • tS ~450kHz frequency or 2.22μs 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 • 2.22μs ≅ 1.46μs t OFF = 2.22μs – 1.46μs ≅ 760ns tON and tOFF are above the minimums with adequate guard band. Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for ION = (450kHz • 2.4V • 10pF) • (1/0.66) ≅ 16μA. ION current calculated from 5V input was 39μA, so a resistor from fADJ to ground = (0.7V/30.1k) = 23μA. 39μA – 23μA = 16μA, 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.

4600 F22

22.1k 30.1kEXTVCC RUN/SS COMP FCB VOUT 5V TO 3.3V AT 8A WITH fADJ = 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 VOSET SVIN PGNDSGND 4.5V TO 7V 3.3V AT 8A 10μF 25V 10μF 25V 330μF 6.3V 22μF 100pFVIN LTM4600HV fADJ RUN/SOFT-START OPEN DRAIN EFFICIENCY = 94% 5V to 3.3V at 8A

Figure 21. Typical Application, 5V to 24V Input, 0.6V to 5V Output, 10A Max

4600 F23

4600 F24

Parallel Operation and Load Sharing 4600hv TA02 15.8k EXTVCC RUN COMP FCB VOUT VOUT = 0.6V  ([100k/N] + RSET)/RSET WHERE N = 2 C1, C3, C7, C8: TAIYO YUDEN, GDK316BJ106ML C2, C9: TAIYO YUDEN, JMK316BJ226ML-T501 C5, C10: SANYO POSCAP, 4TPE470MCL PGOOD VOSET SVIN PGNDSGND 2.5V AT 20A 4.5V TO 24V 2.5V 10μF 35V 10μF 35V C10 470μF 22μF VIN LTM4600HV fADJ 100k EXTVCC RUN COMP FCB VOUT PGOOD VOSET SVIN PGNDSGND 10μF 35V RUN/SOFT-START 10μF 35V 220pF 470μF 22μF VIN LTM4600HV fADJ TOTAL LOAD INDIVIDUAL SHARE 5 10 15 4600hv TA03 IOUT1 IOUT2 12VIN 2.5VOUT 20AMAX Current Sharing Between Two LTM4600HV Modules TYPICAL APPLICATIO U

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 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 BSC TOP VIEW BSC

4 PAD 1

X Y aaa Z aaa Z 13.97 BSC 12.70 BSC 0.11 – 0.27 13.93 BSC 11 13 10 12 15 17 14 16 19 21 18 20 22 4600 02-18 BOTTOM VIEW C(0.30) PAD 1 PADS SEE NOTES 94 95 96 97 98 99 100 101 102 103 104 19181716765432 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 11109 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 M YXeee1 SUGGESTED SOLDER PAD LAYOUT TOP VIEW 94 95 96 97 98 99 100 101 102 103 104 19181716765432 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 11109 13 14 15 26 27 28 29 30 31 33 34 35 36 37 38 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 A B C D E F G H J L M N P R T K PACKAGE DESCRIPTIO U 104-Lead (15mm × 15mm) (Reference LTM DWG # 05-05-1800)

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 - PACKAGE DESCRIPTIO U Pin Assignment Tables (Arranged by Pin Number)

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. PACKAGE DESCRIPTIO U PIN NAME G1 PGND H11 H13 H15 H17 PGND PGND PGND PGND PGND PGND J1 PGND K11 K13 K15 K17 PGND PGND PGND PGND PGND PGND L10 L12 L14 L16 L18 L20 L22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND M10 M12 M14 M16 M18 M20 M22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND N10 N12 N14 N16 N18 N20 N22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PIN NAME P10 P12 P14 P16 P18 P20 P22 V OUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT R10 R12 R14 R16 R18 R20 R22 V OUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT T10 T12 T14 T16 T18 T20 T22 V OUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT PIN NAME A11 A13 V IN VIN VIN VIN VIN VIN B1 V IN C10 C12 C14 V IN VIN VIN D1 V IN E10 E12 E14 V IN VIN VIN 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)

© LINEAR TECHNOLOGY CORPORATION 2005 LT 0707 REV C • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com TYPICAL APPLICATIO U 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 100k EXTVCC RUN COMP FCB VOUT PGOOD VOSET SVIN PGNDSGND 10μF 35V 10μF 35V 100pF 470μF PGOOD 22μF VIN LTM4600HV fADJ 49.9k This product contains technology licensed from Silicon Semiconductor Corporation. RELATED PARTS 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 μModule Basic 10A DC/DC μModule LTM4601 12A DC/DC μModule with PLL, Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation to 48A, LTM4601-1 Version has no Remote Sensing LTM4602 6A DC/DC μModule Pin Compatible with the LTM4600 LTM4603 6A DC/DC μModule 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