PDF《20VIN, Dual 4A or Single 8A》

1 Typical Application Description 20VIN, Dual 4A or Single 8A DC/DC ?Module Regulator TheLTM? 4642isacompletedual4Aorsingle8Astep-down DC/DCμModule? (micromodule)regulator.

Includedinthe packagearetheswitchingcontroller,powerFETs,inductor, and all support components. Operating over input voltage ranges of 4.5V to 20V, (2.375V min with external CPWR bias), the LTM4642 supports two outputs with voltage ranges of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers 4A continuous current (5A peak) for each output. High switching frequency and a valley current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The two outputs are interleaved with 180° phase to minimize the ripple noise and reduce the I/O capacitors. The power module is offered in a 9mm * 11.25mm * 4.92mm BGA package. The LTM4642 is RoHS compliant with Pb-free finish. Dual 4A 1V and 1.2V DC/DC ?Module Regulator Features Applications n n Small Form Factor Dual 4A Power Supply n n Wide Input Voltage Range: 4.5V to 20V (2.375V Min with CPWR Bias) n n Dual 180° Out-of-Phase Outputs with 4A DC n n Dual Outputs with 0.6V to 5.5V Range n n Output Voltage Tracking n n ±1.5% Maximum Total DC Output Voltage Error n n Up to 95% Maximum Efficiency n n Phase-Lockable Fixed Frequency 600kHz to 1.4MHz n n Constant On-Time, Valley Current Mode Architecture n n Selectable Burst Mode? Operation n n Output Overvoltage and Overcurrent Protection n n 9mm * 11.25mm * 4.92mm BGA Package n n Telecom and Networking Equipment n n Servers n n FPGA Power Efficiency vs Load Current at 12V input L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, ?Module and LTpowerCAD are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 8163643. + VIN1 VIN2 CPWR SGND PINS NOT USED: COMP1, COMP2, PHASEMD, CLKOUT, EXTVCC, SW1, SW2 GND LTM4642 4.7?F 22?F 2* 47?F 470pF VOUT1 470pF VOUT2 100?F 0.1?F VIN 4.75V TO 20V 2.2Ω DRVCC INTVCC RUN1 133k 10k 90.9k 61.9k 60.4k

4642 TA01a 10k VRNG1 RUN2 PGOOD1 PGOOD2 TRACK/SS1 TRACK/SS2 MODE/PLLIN INTVCC VOUT1 VOUT1 1V AT 4A LOAD VOUT2 VOUTS1 FREQ VOUTSC VFB2 VFB1 VOUT2 1.2V AT 4A LOAD INTVCC + 47?F 100?F 0.1?F LOAD CURRENT (A)

0 70 EFFICIENCY (%)

75 80

85 1

2 3

4 4642 TA01b

90 0.5 1.5 2.7 3.5 1.2V (650kHz) 1V (650kHz)

2 Pin Configuration Absolute Maximum Ratings VIN1, VIN2, SW1, SW2, CPWR.0.3V to 22V INTVCC, DRVCC, PGOOD1,2, RUN1,2, EXTVCC, VFB1, VFB2 (Note 4)0.3V to INTVCC + 0.3V COMP1, COMP2 (Note 4)0.3V to 2.7V MODE/PLLIN, FREQ, PHASMD, VRNG1.0.3V to INTVCC + 0.3V VOUT1, VOUT2, VOUTS1.0.3V to 6V VOUTS 0.3V to 2.75V TK/SS1, TK/SS2.0.3V to 5V Internal Operating Temperature Range (Note 2)40°C to 125°C Maximum Reflow Body Temperature.245°C Storage Temperature Range.55°C to 125°C (Note 1)

1 A H G F E D C VOUT2 GND SW2 RUN2 PHASMD COMP2 CLKOUT RUN1 SW1 COMP1 FREQ SGND VOUTS C VOUT1 MODE/PLLIN CPWR PGOOD2 TRACK/SS2 TRACK/SS1 GND GND GND GND GND VIN2 VFB2 VFB1 PGOOD1 DRVCC EXTVCC INTVCC VRNG1 VIN1 B

2 3

4 5

6 7 BGA Package 56-Lead (9mm * 11.25mm * 4.92mm) VOUTS1 TJMAX = 125°C, θJA = 15°C/W, θJP = 4°C/W θJA DERIVED FROM 95mm * 76mm PCB WITH

4 LAYERS WEIGHT = 1.2635g SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN(DC) Input DC Voltage VIN ≤ 4.5V, Connect CPWR to a Bias >

4.5V l 2.375

20 V VOUT1,2(RANGE) Output Voltage Range VIN = 6V to 20V l 0.6 5.5 V VOUT1,2(DC) Output Voltage, Total Variation with Line and Load CIN = 10?F *2, COUT = 47?F Ceramic, 100?F POSCAP , RSET = 40.2k? VIN = 12V, VOUT = 1.5V, IOUT = 4A l 1.4775 1.5 1.5225 V Input Specifications IINRUSH(VIN) Input Inrush Current at Start-Up IOUT = 0A, CIN = 10?F, COUT = 47?F Ceramic and 100?F POSCAP , VOUT = 1.5V VIN = 12V 0.25 A Order Information Electrical Characteristics The l denotes the specifications which apply over the full internal operating temperature range (Note 2), otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application in Figure 27. Specified as each channel. (Note 3) PART NUMBER PAD OR BALL FINISH PART MARKING* PACKAGE TYPE MSL RATING TEMPERATURE RANGE (SEE NOTE 2) DEVICE FINISH CODE LTM4642EY#PBF SAC305 (RoHS) LTM4642Y e1 BGA