LTM4658EVPBF datasheet(8/26 Pages) AD

8 / 26 page

LTM4658

Rev. 0

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OPERATION

The LTM4658 is a standalone nonisolated step-down

μModule regulator. It can deliver up to 10A of DC output

current with a few external input and output capacitors.

This module provides precisely regulated output voltage

from 0.5V to 5.5V over 2.25V to 5.5V input voltage range.

The typical application schematic is shown on page 1.

The LTM4658 has an integrated constant frequency peak

current mode step-down regulator with power MOSFETs,

inductor, and other supporting discrete components. The

default switching frequency is 2MHz. It can be externally

synchronized to a clock from 1MHz to 2.60MHz. See the

Applications Information section.

Current mode control provides cycle-by-cycle fast current

limiting, overcurrent protection. Internal feedback loop

compensation provides sufficient stability margins and

good transient performance with wide range of output

capacitors, even with all ceramic output capacitors.

Internal undervoltage and overvoltage comparators pull

the open-drain PGOOD output low if the feedback voltage

exits a −3%/10% window around the regulation point.

Furthermore, in an overvoltage condition, internal top

MOSFET is turned off and bottom MOSFET is turned on

and held on until the overvoltage condition clears.

For systems with higher power requirements, multiphase

operationcanbeeasilyemployedwiththesynchronization

and phase mode controls.

Pulling the RUN pin to GND forces the controller into its

shutdown state, turning off both power MOSFETs and

most of the internal control circuitry. At light load cur-

rents, pulse-skipping mode operation can be enabled to

achieve higher efficiency compared to forced continuous

mode by setting MODE/SYNC pin to VIN. The SSTT pin is

used for power supply tracking, soft-start programming

and die temperature monitoring. See the Applications

Information section.

LTM4658EVPBF Arkusz danych(PDF) 8 Page - Analog Devices