LTC4449 datasheet(16/108 Pages) LINER

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LTC3882-1

Rev A

For more information www.analog.com

TEST CIRCUIT

TIMING DIAGRAM

OPERATION

SDA

SCL

tHD(STA)

tHD(DAT)

tSU(STA)

tSU(STO)

tSU(DAT)

tLOW

tHD(SDA)

tSP

tBUF

START

CONDITION

STOP

CONDITION

REPEATED START

CONDITION

START

CONDITION

tHIGH

38821 TD

(Channel 0 Example)

–

DIGITAL

LTC3882-1

COMP0

FB0

VSENSE0+

VSENSE0–

1.024V

12-BIT

D/A

LTC1055

TARGET = VOUT_COMMAND

38821 TC

Overview

The LTC3882-1 is a dual channel/dual phase, constant

frequency analog voltage mode controller for DC/DC step-

down applications. It features a PMBus compliant digital

interface for monitoring and control of important power

system parameters. The chip operates from an IC power

supplybetween3Vand13.2Vandisintendedforconversion

from VIN between 3V and 38V to output voltages between

0.5V and 5.25V. It is designed to be used in a switching

architecture with external FET drivers, including higher

level integrations such as non-isolated power blocks.

Major features include:

• Digitally Programmable Output Voltage

• Digitally Programmable Output Current Limit

• Digitally Programmable Input Voltage Supervisor

• Digitally Programmable Output Voltage Supervisors

• Digitally Programmable Switching Frequency

• Digitally Programmable On and Off Delay Times

• Digitally Programmable Soft-Start/Stop

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