LTM4602HV_15 LINER | Alldatasheet

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6A, 28VIN High Effi ciency DC/DC µModule The LTM®4602HV is a complete 6A, 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 LTM4602HV supports an output voltage range of 0.6V to 5V, set by a single resistor. This high effi ciency design delivers 6A continuous current (8A 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 LTM4602HV is packaged in a thermally enhanced, com- pact (15mm × 15mm) and low profi le (2.8mm) over-molded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. For the 4.5V to 20V input range version, refer to the LTM4602. ■ Telecom and Networking Equipment ■ Servers ■ Industrial Equipment ■ Point of Load Regulation ■ Complete Switch Mode Power Supply ■ Wide Input Voltage Range: 4.5V to 28V ■ 6A DC, Typical 8A Peak Output Current ■ 0.6V to 5V Output Voltage ■ 1.5% Output Voltage Regulation ■ Ultrafast Transient Response ■ Parallel µModule™ DC/DC Converters ■ Current Mode Control ■ Pin Compatible with the LTM4600 and LTM4602 ■ Up to 92% Effi ciency ■ Programmable Soft-Start ■ Output Overvoltage Protection ■ Optional Short-Circuit Shutdown Timer ■ Pb-Free (e4) RoHS Compliant Package with Gold-Pad Finish ■ Small Footprint, Low Profi le (15mm × 15mm × 2.8mm) LGA Package 6A 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 4602HV TA01a LTM4602HV PGND SGND VOUT VOSET VIN 4.5V TO 28V ABS MAX VOUT 2.5V 6ACOUT 31.6k , LT, LTC 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. Protected by U.S. Patents including 5481178, 6100678, 6580258, 5847554, 6304066. LOAD CURRENT (A) EFFICIENCY (%) 4602HV G03 21 536 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 3.3VOUT (1MHz)

Operating Temperature Range (Note 2) ... –40°C to 85°C (Note 1) The ● denotes the specifi cations which apply over the –40°C to 85°C 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 PACKAGE/ORDER I FOR ATIOUU W 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 V Input Specifi cations V IN(UVLO) Under Voltage Lockout Threshold I OUT = 0A 3.4 4 V IINRUSH(VIN) Input Inrush Current at Startup I OUT = 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 I OUT = 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 50 100 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 = 6A V IN = 12V, VOUT = 3.3V, IOUT = 6A V IN = 5V, VOUT = 1.5V, IOUT = 6A V IN = 24V to 3.3V at 6A, EXTVCC = 5V 0.88 1.50 2.08 0.98 A A A A 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 PART NUMBER LGA PART MARKING* LTM4602HVEV#PBF LTM4602HVIV#PBF LTM4602HVV LTM4602HVV Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.

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 LTM4602HVE 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 LTM4602HVI is guaranteed and tested over the –40°C to 85°C temperature range. Note 3: Refer to current de-rating curves and thermal application note. Note 4: Test assumes current derating verses temperature. 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 % ΔVOUT(0A-6A) VOUT Load Regulation Accuracy V OUT = 1.5V. FCB = 0V, IOUT = 0A to 6A, VIN = 5V, VIN = 12V (Note 4) ±0.25 ±0.5 ±0.5 VOUT(AC) Output Ripple Voltage V IN = 12V, VOUT = 1.5V, FCB = 0V, IOUT = 0A 10 15 mV P-P fs Output Ripple Voltage Frequency FCB = 0V, I OUT = 6A, VIN = 12V, VOUT = 1.5V 800 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 3A/µs COUT = 22µF 6.3V, 330µF 4V Pos Cap, See Table 2 30 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 FB 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 –40°C to 85°C temperature range, otherwise specifi cations are at TA = 25°C, VIN = 12V. Per typical application (front page) confi guration.

Effi ciency vs Load Current with 5VIN (FCB = 0) TYPICAL PERFOR A CE CHARACTERISTICSUW Effi ciency vs Load Current with 12VIN (FCB = 0) Effi ciency vs Load Current with 24V IN (FCB = 0) Effi ciency vs Load Current with Different FCB Settings 1.2V Transient Response 1.5V Transient Response 1.8V Transient Response 2.5V Transient Res ponse (See Figure 22 for all curves) LOAD CURRENT (A) 100 4602HV G04 EFFICIENCY (%) 0.1 51 FCB = GND FCB > 0.7V VIN = 12V VOUT = 1.5V VOUT 50mV/DIV 1.2V AT 3A/µs LOAD STEP COUT = 22µF, 6.3V CERAMIC 330µF, 4V SANYO POS CAP IOUT 2A/DIV 20µs/DIV 4602HV G05 1.5V AT 3A/µs LOAD STEP COUT = 22µF, 6.3V CERAMIC 330µF, 4V SANYO POS CAP 20µs/DIV 4602HV G06 VOUT 50mV/DIV IOUT 2A/DIV 1.8V AT 3A/µs LOAD STEP COUT = 22µF, 6.3V CERAMIC 330µF, 4V SANYO POS CAP 20µs/DIV 4602HV G07 VOUT 50mV/DIV IOUT 2A/DIV 2.5V AT 3A/µs LOAD STEP COUT = 22µF, 6.3V CERAMIC 330µF, 4V SANYO POS CAP 20µs/DIV 4602HV G08 VOUT 50mV/DIV IOUT 2A/DIV LOAD CURRENT (A) EFFICIENCY (%) 100 2 4 4602HV G01 6 8 0.8VOUT 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT* *FOR 5V TO 3.3V CONVERSION, SEE FREQUENCY ADJUSTMENT IN APPLICATIONS INFORMATION LOAD CURRENT (A) EFFICIENCY (%) 100 2 4 4602HV G02 6 8 0.8VOUT 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 3.3VOUT (950kHz) LOAD CURRENT (A) EFFICIENCY (%) 4602HV G03 21 536 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 3.3VOUT (1MHz) Light Load Effi ciency vs Load Current with 12VIN (FCB > 0.7V, <5V) LOAD CURRENT (A) EFFICIENCY (%) 100 0.8 4602HV G15 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT

3.3V Transient Response TYPICAL PERFOR A CE CHARACTERISTICSUW Start-Up, IOUT = 0A Start-Up, IOUT = 6A (Resistive Load) Short-Circuit Protection, IOUT = 0A Short-Circuit Protection, IOUT = 6A VIN to VOUT Stepdown Ratio (See Figure 22 for all curves) 3.3V AT 3A/µs LOAD STEP COUT = 22µF, 6.3V CERAMIC 330µF, 4V SANYO POS CAP 20µs/DIV 4602HV G09 VOUT 50mV/DIV IOUT 2A/DIV 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 4602HV G14 10 28 20 25 VOUT (V) 3.3V 2.5V 1.8V 1.5V 1.2V fADJ = OPEN SEE FREQUENCY ADJUSTMENT DISCUSSION FOR 12VIN TO 5VOUT AND 5VIN TO 3.3VOUT CONVERSION 0.6V VIN = 12V VOUT = 1.5V COUT = 1 × 22µF, 6.3V X5R 330µF, 4V SANYO POS CAP NO EXTERNAL SOFT-START CAPACITOR 200µs/DIV 4602HV G10 VOUT 0.5V/DIV IIN 0.5A/DIV VIN = 12V VOUT = 1.5V COUT = 1 × 22µF, 6.3V X5R 330µF, 4V SANYO POS CAP NO EXTERNAL SOFT-START CAPACITOR 500µs/DIV 4602HV G11 VOUT 0.5V/DIV IIN 0.5A/DIV VIN = 12V VOUT = 1.5V COUT = 1 × 22µF, 6.3V X5R 330µF, 4V SANYO POS CAP NO EXTERNAL SOFT-START CAPACITOR 20µs/DIV 4602HV G12 VOUT 0.5V/DIV IIN 0.5A/DIV VIN = 12V VOUT = 1.5V COUT = 1 × 22µF, 6.3V X5R 330µF, 4V SANYO POS CAP NO EXTERNAL SOFT-START CAPACITOR 20µs/DIV 4602HV G13 VOUT 0.5V/DIV IIN 0.5A/DIV

VIN (Bank 1): Power Input Pins. Apply input voltage be- tween these pins and PGND pins. Recommend placing input decoupling capacitance directly between V IN pins and PGND pins. fADJ (Pin A15): A 110k resistor from VIN to this pin sets the one-shot timer current, thereby setting the switching frequency. The LTM4602HV 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 10k 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 PGND pins. Recommend placing High Frequency output decoupling capacitance directly between these pins and PGND 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 LTM4602HV Block Diagram

µModule Description The LTM4602HV is a standalone non-isolated synchronous switching DC/DC power supply. It can deliver up to 6A 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 LTM4602HV 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 800kHz at full load. With current mode control and internal feedback loop compensation, the LTM4602HV 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). Current mode control provides cycle-by-cycle fast current limit. In addition, foldback current limiting is provided in an over-current condition while V FB drops. Also, the LTM4602HV 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 10k 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 in the PCB layout to minimize the trace inductance and high frequency AC noise. Output Capacitors The LTM4602HV is designed for low output voltage ripple. The bulk output capacitor COUT 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 3A/µs transient with a specifi c output capacitance. Fault Conditions: Current Limit and Over current Foldback The LTM4602HV 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 LTM4602HV 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 LTM4602HV as well as a timer for soft-start and over- current latchoff. Pulling the RUN/SS pin below 0.8V puts the LTM4602HV 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 LTM4602HV, 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 LTM4602HV 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 constraints 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 17), 0A to 3A Step (Typical Values)

down to ground in order to restart operation. Generally 0.1µF is more than suffi cient. Figure 3. RUN/SS Pin Voltage During Startup and RUN during startup and short circuit.

tion loss is minimized and light load effi cient is improved. output voltage ripple increases at light load. where N is the number of LTM4602HVs in parallel. Figure 7. Parallel Two µModules with Load Sharing OPTI-LOOP is a trademark of Linear Technology Corporation.

Figure 17. 12V to 3.3V (950kHz), Figure 19. 24V to 3.3V, BGA HeatsinkFigure 18. 24V to 3.3V, No Heatsink siderations are still necessary.

  • Use large PCB copper areas for high current path, in- cluding V IN, PGND and VOUT. It helps to minimize the PCB conduction loss and thermal stress
  • Place high frequency ceramic input and output capaci- tors next to the VIN, PGND and VOUT 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

Table 4. 3.3V Output Table 3. 1.5V Output

200 None 14

400 None 12

  • Do not put via directly on pad
  • 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. LTM4602 Frequency Adjustment The LTM4602HV 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

APPLICATIO S I FOR ATIOWU UU 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 8V to 16V. Higher input voltages can be used without the 15k on f ADJ. The inductor ripple current gets too high above 16V or below 8V. Equations for setting frequency: VOUT = 3.3V I ON = (VIN – 0.7V)/110k; for 5V input, ION = 39µA frequency = (I ON/[2.4V • 10pF]) • (DC) = 1.07MHz; DC = duty cycle, duty cycle is (VOUT/VIN) t = t ON + t OFF, t ON = on-time, t OFF = off-time of the switching period; t = 1/frequency tOFF must be greater than 400ns, or t – tON > 400ns. t ON = DC • t ~450kHz frequency or 2.22µs period is chosen. 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 = (I ON/[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 f ADJ to ground = (0.7V/30.1k) = 23µA. 39µA – 23µA = 16µA, sets the adequate ION 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 induc- tor ripple current gets too high above 7V, and the 400ns minimum off-time is limited below 4.5V. Therefore, at 3.3V output, a 30.1k resistor is recommended to add from pin f ADJ to ground when the input voltage is between 4.5V to 7V. However, this resistor needs to be removed to avoid high inductor ripple current when the input voltage is more than 7V. Similarly, for 5V output, a 15k resistor is recommended to adjust the frequency when the input voltage is between 8V to 16V. This 15k resistor is removed when the input voltage becomes higher than 16V. Please refer to the Typical Performance curve V IN to VOUT Step-Down Ratio. In 12V to 3.3V and 24V to 3.3V applications, if a 35k resistor is added from the fADJ pin to ground, then a 2% effi ciency gain will be achieved as shown in the 12V and 24V effi ciency graphs shown in the Typical Characteris- tics. This is due to lowering the transition losses in the power MOSFETs by reducing the switching frequency from 1.3mHz to 1mHz. 5V to 3.3V at 5A 4602HV F23 RSET 22.1k 30.1k EXTVCC RUN/SS COMP FCB VOUT 5V TO 3.3V AT 5A WITH fADJ = 30.1k LTM4602HV MINIMUM ON-TIME = 100ns LTM4602HV MINIMUM OFF-TIME = 400ns C1, C3: TDK C3216X5R1E106MT C2: TAIYO YUDEN, JMK316BJ226ML C4: SANYO POS CAP, 6TPE330MIL PGOOD VOSET SVIN PGNDSGND VIN 4.5V TO 7V VOUT 3.3V AT 5A 10µF 25V 10µF 25V 330µF 6.3V 22µF 100pFVIN LTM4602HV fADJ RUN/SOFT-START OPEN DRAIN EFFICIENCY = 92%

Figure 22. Typical Application, 5V to 24V Input, 0.6V to 6V Output, 6A Max

Parallel Operation and Load Sharing Current Sharing Between Two LTM4602HV Modules TYPICAL APPLICATIO U 4602HV TA02 RSET 15.8k EXTVCC RUN COMP FCB VOUT VOUT = 0.6V  ([100k/N] + RSET)/RSET WHERE N = 2 C3, C8: TAIYO YUDEN, GDK316BJ106ML C2, C9: TAIYO YUDEN, JMK316BJ226ML-T501 C5, C10: SANYO POS CAP, 4TPE330MI PGOOD VOSET SVIN PGNDSGND VOUT 2.5V 12A VIN 4.5V TO 24V 10µF 35V 10µF 35V C10 330µF 22µF VIN LTM4602HV fADJ 100k EXTVCC RUN COMP FCB VOUT PGOOD VOSET SVIN PGNDSGND RUN/SOFT-START 220pF 330µF 22µF VIN LTM4602HV fADJ TOTAL LOAD INDIVIDUAL SHARE 4602HV TA03 IOUT1 IOUT2 12VIN 2.5VOUT 12AMAX

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 LGA104 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 representation 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 2007 LT 0107 • 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, 5A Regulator 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 10A Basic 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, Fast Transient Response LTM4603 6A DC/DC µModule with PLL and Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation, LTM4603-1 Version has no Remote Sensing, Fast Transient Response Polyphase is a registered trademark of Linear Technology Corporation. 4602HV TA04 C1: TAIYO YUDEN, GMK316BJ106ML C3: TAIYO YUDEN, JMK316BJ226ML-T501 C4: SANYO POS CAP, 4TPE330MI V OUT 1.8V AT 6A VIN 4.5V TO 24V 100k EXTVCC RUN COMP FCB VOUT PGOOD VOSET SVIN PGNDSGND 10µF 35V 100pF 330µF PGOOD 22µF VIN LTM4602HV fADJ RSET 49.9k