LTM4601A datasheet(9/28 Pages) LINER

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LTM4601A/LTM4601A-1

4601afb

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CIN

External Input Capacitor Requirement

(VIN = 4.5V to 20V, VOUT = 1.5V)

IOUT = 12A , 3× 10μF Ceramics

μF

COUT

External Output Capacitor Requirement

(VIN = 4.5V to 20V, VOUT = 1.5V)

IOUT = 12A

100

200

μF

TA = 25°C, VIN = 12V. Use Figure 1 conﬁguration.

Power Module Description

The LTM4601A is a standalone nonisolated switching mode

DC/DC power supply. It can deliver up to 12A of DC output

current with few external input and output capacitors.

This module provides precisely regulated output voltage

programmable via one external resistor from 0.6VDC to

5.0VDC over a 4.5V to 20V wide input voltage. The typical

application schematic is shown in Figure 18.

The LTM4601A has an integrated constant on-time current

mode regulator, ultralow RDS(ON) FETs with fast switch-

ing speed and integrated Schottky diodes. The typical

switching frequency is 850kHz at full load. With current

mode control and internal feedback loop compensation,

the LTM4601A module has sufﬁcient stability margins and

good transient performance under a wide range of operat-

ing conditions and with a wide range of output capacitors,

even all ceramic output capacitors.

Current mode control provides cycle-by-cycle fast current

limit. Besides, foldback current limiting is provided in an

overcurrent condition while VFBdrops.Internalovervoltage

and undervoltage comparators pull the open-drain PGOOD

output low if the output feedback voltage exits a ±10%

window around the regulation point. Furthermore, in an

overvoltage condition, internal top FET Q1 is turned off

and bottom FET Q2 is turned on and held on until the

overvoltage condition clears.

Pulling the RUN pin below 1V forces the controller into its

shutdown state, turning off both Q1 and Q2. At low load

current, the module works in continuous current mode by

default to achieve minimum output voltage ripple.

When DRVCC pin is connected to INTVCC an integrated

5V linear regulator powers the internal gate drivers. If a

5V external bias supply is applied on the DRVCC pin, then

an efﬁciency improvement will occur due to the reduced

power loss in the internal linear regulator. This is especially

true at the higher input voltage range.

The LTM4601A has a very accurate differential remote

sense ampliﬁer with very low offset. This provides for

very accurate remote sense voltage measurement. The

MPGM pin, MARG0 pin and MARG1 pin are used to sup-

port voltage margining, where the percentage of margin

is programmed by the MPGM pin, and the MARG0 and

MARG1 select margining.

The PLLIN pin provides frequency synchronization of the

device to an external clock. The TRACK/SS pin is used for

power supply tracking and soft-start programming.

DECOUPLING REQUIREMENTS

OPERATION

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