Datasheet LTM4642 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 20VIN, Dual 4A or Single 8A DC/DC μModule Regulator |
| Pages / Page | 32 / 10 — siMpliFieD block DiagraM. Figure 1. Simplified LTM4642 Block Diagram |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
siMpliFieD block DiagraM. Figure 1. Simplified LTM4642 Block Diagram
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Text Version of Document
LTM4642
siMpliFieD block DiagraM
INPUT VOLTAGE SOURCE LESS THAN 5.3V BUT GREATER THAN 4.5V, CONNECT DRVCC AND CPWR TO VIN. INPUT VOLTAGE LESS THAN 4.5V BUT GREATER THAN 2.375V, PGOOD1 PROVIDE AN EXTERNAL BIAS TO CPWR 5V OR GREATER PGOOD1 CPWR R5 2.2Ω TRACK1 C7 TRACK1 VIN1 0.1µF SS VIN1 4.5V TO 20V CAP C7 C1 MTOP1 0.1µF 22µF RUN1* GND V 25V IN1 RUN1 = 100k RRUN1 SW1 ((MIN V 100k IN/1.3) – 1) 255k V 1µH OUT1 V CLKOUT OUT1 1.5V/4A CLKOUT + + C3 MODE/PLLIN MBOT1 2.2µF 49.9Ω COUT1 INTVCC 47µF GND PHASMD PHASMD V POWER CONTROL OUTS1 FREQ 60.4k RFREQ VFB1 49.9k VFB1 + RSET1 COMP1 V – 40.2k COMP1 – OUTS INTERNAL COMP SGND TRACK2 TRACK2 SS PGOOD2 PGOOD2 CAP VIN2 RUN2 VIN2 C4 VIN2 0.1µF RRUN2 MTOP2 GND 22µF 4.5V TO 20V 255k 100k 25V INTVCC V SW2 RNG1 SW2 VOUT2 DRVCC 1µH VOUT2 1.2V/4A R4 4.7µF C6 + 2.2Ω 1µF MBOT2 1µF COUT2 INTVCC GND GND C2 1µF 60.4k EXTV V CC FB2 V EXTV FB2 CC RSET2 COMP2 60.4k COMP2 INTERNAL COMP SGND SGND 4642 F01 * ABSOLUTE MAXIMUM = 6V
Figure 1. Simplified LTM4642 Block Diagram Decoupling requireMenTs TA = 25°C. Use Figure 1 configuration. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
External Input Capacitor Requirement CIN VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V IOUT1 = 4A, IOUT2 = 4A 22 µF External Output Capacitor Requirement COUT1 VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V IOUT1 = 4A 150 µF COUT2 IOUT2 = 4A 150 µF 4642fb 10 For more information www.linear.com/LTM4642 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photograph Design Resources Related Parts
siMpliFieD block DiagraM
INPUT VOLTAGE SOURCE LESS THAN 5.3V BUT GREATER THAN 4.5V, CONNECT DRVCC AND CPWR TO VIN. INPUT VOLTAGE LESS THAN 4.5V BUT GREATER THAN 2.375V, PGOOD1 PROVIDE AN EXTERNAL BIAS TO CPWR 5V OR GREATER PGOOD1 CPWR R5 2.2Ω TRACK1 C7 TRACK1 VIN1 0.1µF SS VIN1 4.5V TO 20V CAP C7 C1 MTOP1 0.1µF 22µF RUN1* GND V 25V IN1 RUN1 = 100k RRUN1 SW1 ((MIN V 100k IN/1.3) – 1) 255k V 1µH OUT1 V CLKOUT OUT1 1.5V/4A CLKOUT + + C3 MODE/PLLIN MBOT1 2.2µF 49.9Ω COUT1 INTVCC 47µF GND PHASMD PHASMD V POWER CONTROL OUTS1 FREQ 60.4k RFREQ VFB1 49.9k VFB1 + RSET1 COMP1 V – 40.2k COMP1 – OUTS INTERNAL COMP SGND TRACK2 TRACK2 SS PGOOD2 PGOOD2 CAP VIN2 RUN2 VIN2 C4 VIN2 0.1µF RRUN2 MTOP2 GND 22µF 4.5V TO 20V 255k 100k 25V INTVCC V SW2 RNG1 SW2 VOUT2 DRVCC 1µH VOUT2 1.2V/4A R4 4.7µF C6 + 2.2Ω 1µF MBOT2 1µF COUT2 INTVCC GND GND C2 1µF 60.4k EXTV V CC FB2 V EXTV FB2 CC RSET2 COMP2 60.4k COMP2 INTERNAL COMP SGND SGND 4642 F01 * ABSOLUTE MAXIMUM = 6V
Figure 1. Simplified LTM4642 Block Diagram Decoupling requireMenTs TA = 25°C. Use Figure 1 configuration. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
External Input Capacitor Requirement CIN VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V IOUT1 = 4A, IOUT2 = 4A 22 µF External Output Capacitor Requirement COUT1 VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V IOUT1 = 4A 150 µF COUT2 IOUT2 = 4A 150 µF 4642fb 10 For more information www.linear.com/LTM4642 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photograph Design Resources Related Parts
