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LTM4608

4608f

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

2.375 TO 5.5V

VOUT

1.5V

VOUT

VIN

GND

22pF

10k

RFB

6.65k

4608 BD

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CIN

External Input Capacitor Requirement

(VIN = 2.375V to 5.5V, VOUT = 1.5V)

IOUT = 8A

μF

COUT

External Output Capacitor Requirement

(VIN = 2.375V to 5.5V, VOUT = 1.5V)

IOUT = 8A

100

μF

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

Figure 1. Simpliﬁed LTM4608 Block Diagram

OPERATION

The LTM4608 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 2.375V to 5.5V input voltage. The typical

application schematic is shown in Figure 18.

The LTM4608 has an integrated constant frequency current

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 LTM4608 module has sufﬁcient stabil-

ity margins and good transient performance with a wide

range of output capacitors, even with all ceramic output

capacitors.

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