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LTM4608A

4608afa

SIMPLIFIED BLOCK DIAGRAM

INTERNAL

FILTER

POWER

CONTROL

INTERNAL

COMP

INTERNAL

FILTER

SVIN

TRACK

MGN

BSEL

PGOOD

MODE

RUN

CLKIN

CLKOUT

PHMODE

PLLLPF

SGND

ITH

ITHM

22μF

COUT

10μF

CIN

VIN

2.7 TO 5.5V

VOUT

1.5V

VOUT

VIN

GND

22pF

10k

RFB

6.65k

4608A BD

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CIN

External Input Capacitor Requirement

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

IOUT = 8A

μF

COUT

External Output Capacitor Requirement

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

IOUT = 8A

100

μF

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

Figure 1. Simpliﬁed LTM4608A Block Diagram

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.

With current mode control and internal feedback loop

compensation, the LTM4608A module has sufﬁcient

stability margins and good transient performance with

a wide range of output capacitors, even with all ceramic

output capacitors.

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