LTM4659EVPBF datasheet(8/26 Pages) AD

8 / 26 page

LTM4659

Rev. 0

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OPERATION

The LTM4659 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 a 2.25V to 5.5V input voltage

range. See Typical Application schematic for more details.

The LTM4659 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

limitingandovercurrentprotection.Internalfeedbackloop

compensation provides sufficient stability margins and

good transient performance with a 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, the internal top

MOSFET is turned off, and the 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 currents,

PSM operation can be enabled to achieve higher efficiency

compared to FCM by setting the 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.

LTM4659EVPBF Datasheet(PDF) 8 Page - Analog Devices