LTM4618(RevA) Ver la hoja de datos (PDF) - Linear Technology

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componentes Descripción

Fabricante

LTM4618
(Rev.:RevA)

6A DC/DC µModule Regulator with Tracking and Frequency Synchronization

Linear Technology 

LTM4618

OPERATION

Power Module Description

The LTM4618 is a standalone non-isolated switching mode

DC/DC power supply. It can deliver up to 6A (DC current)

output with few external input and output capacitors. This

module provides precisely regulated output voltages pro-

grammable via external resistors from 0.8VDC to 5.0VDC

over 4.5V to 26.5V input voltages. The typical application

schematic is shown in Figure 21. For ≤6V inputs, connect

VIN, INTVCC and EXTVCC together.

The LTM4618 has an integrated constant frequency current

mode regulator and built-in power MOSFET devices with

fast switching speed. The typical switching frequency is

750kHz.

With current mode control and internal feedback loop

compensation, the LTM4618 module has sufficient stabil-

ity margins and good transient performance with a wide

range of output capacitors, even with all ceramic output

capacitors.

Current mode control provides cycle-by-cycle fast current

limit and current foldback in a short-circuit condition. Pull-

ing the RUN pin below 1.1V forces the controller into its

shutdown state, by turning off both MOSFETs. The TK/SS

pin can be used for programming the output voltage ramp

and voltage tracking during start-up. See the Applications

Information section.

The LTM4618 is internally compensated to be stable over

all operating conditions. LTpowerCAD™ is provided for

transient and stability analysis. The VFB pin is used to

program the output voltage with a single external resistor

to ground. Multiphase operation can be easily employed

with the synchronization control.

High efficiency at light loads can be accomplished with

selectable Burst Mode or pulse-skipping mode operations

using the MODE/PLLIN pin. Efficiency graphs are provided

for light load operation in the Typical Performance Char-

acteristics section.

4618fa

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