LTM4608AV View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTM4608AV

Low VIN, 8A DC/DC µModule Regulator with Tracking, Margining, and Frequency Synchronization

Linear Technology 

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SIMPLIFIED BLOCK DIAGRAM

LTM4608A

SVIN

TRACK

MGN

BSEL

PGOOD

MODE

RUN

CLKIN

CLKOUT

PHMODE

ITH

PLLLPF

ITHM

SGND

INTERNAL

COMP

INTERNAL

FILTER

INTERNAL

FILTER

POWER

CONTROL

10µF

10µF

VIN

+

VIN

2.7 TO 5.5V

10µF

CIN

M1

0.22µH

M2

22µF

SW

VOUT

VOUT

1.5V

22pF

COUT

GND

10k

FB

RFB

6.65k

4608A BD

Figure 1. Simplified LTM4608A Block Diagram

Table 1. Decoupling Requirements. TA = 25°C, Block Diagram Configuration

SYMBOL

PARAMETER

CONDITIONS

CIN

External Input Capacitor Requirement IOUT = 8A

(VIN = 2.7V to 5.5V, VOUT = 1.5V)

COUT

External Output Capacitor Requirement IOUT = 8A

(VIN = 2.7V to 5.5V, VOUT = 1.5V)

MIN TYP MAX UNITS

10

µF

100

µF

OPERATION

The LTM4608A is a standalone nonisolated switch mode

DC/DC power supply. It can deliver up to 8A of DC output

current with few external input and output capacitors.

This module provides precisely regulated output voltage

programmable via one external resistor from 0.6V DC to

5.0V DC over a 2.7V to 5.5V input voltage. The typical

application schematic is shown in Figure 18.

The LTM4608A has an integrated constant frequency cur-

rent mode regulator and built-in power MOSFET devices

with fast switching speed. The typical switching frequency

is 1.5MHz. For switching noise sensitive applications, it

can be externally synchronized from 0.75MHz to 2.25MHz.

Even spread spectrum switching can be implemented in

the design to reduce noise.

4608afc

9

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