LTM4642 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LTM4642

20VIN, Dual 4A or Single 8A DC/DC µModule Regulator

Linear Technology 

LTM4642

Simplified Block Diagram

PGOOD1

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,

PROVIDE AN EXTERNAL BIAS TO CPWR 5V OR GREATER

TRACK1

SS

CAP

VIN1

RUN1 = 100k

((MIN VIN/1.3) – 1)

CLKOUT

RRUN1

255k

INTVCC

PHASMD

RFREQ

49.9k

COMP1

TRACK1

RUN1*

CLKOUT

MODE/PLLIN

PHASMD

FREQ

COMP1

PGOOD1

100k

CPWR

R5

2.2Ω

C7

0.1µF

MTOP1

C7

0.1µF

1µH

VIN1

GND

SW1

VOUT1

POWER CONTROL

MBOT1

2.2µF

49.9Ω

GND

VOUTS1

60.4k

VFB1

VOUTS–

VIN1

4.5V TO 20V

C1

22µF

25V

VOUT1

1.5V/4A

+

COUT1

+

C3

47µF

VFB1

RSET1

40.2k

INTERNAL

COMP

TRACK2

SS

CAP

VIN2

VRNG1

RRUN2

255k

R4

2.2Ω

4.7µF

EXTVCC

COMP2

TRACK2

RUN2

INTVCC

DRVCC

INTVCC

EXTVCC

COMP2

SGND

C6

1µF

C2

1µF

100k

MTOP2

0.1µF

1µH

PGOOD2

VIN2

GND

SW2

VOUT2

MBOT2

1µF

GND

60.4k

VFB2

PGOOD2

C4

VIN2

22µF 4.5V TO 20V

25V

SW2 VOUT2

1.2V/4A

+

COUT2

GND

VFB2

RSET2

60.4k

SGND

INTERNAL

COMP

SGND

* ABSOLUTE MAXIMUM = 6V

4642 F01

Figure 1. Simplified LTM4642 Block Diagram

Decoupling Requirements TA = 25°C. Use Figure 1 configuration.

SYMBOL

CIN

COUT1

COUT2

PARAMETER

External Input Capacitor Requirement

VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V

External Output Capacitor Requirement

VIN = 4.5V to 20V, VOUT1 = 1.5V, VOUT2 = 1.5V

CONDITIONS

IOUT1 = 4A, IOUT2 = 4A

IOUT1 = 4A

IOUT2 = 4A

MIN TYP MAX UNITS

22

µF

150

µF

150

µF

4642fb

10

For more information www.linear.com/LTM4642

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