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SC2655EVB Datasheet

IC型號：
SC2655EVB
PDF描述：
Programmable Synchronous DC/DC Hysteretic Controller with VR...
文件大小：
338.09KB
PDF頁數(shù)：
20頁
芯片廠家：
SEMTECH

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Programmable Synchronous DC/DC

Hysteretic Controller with VRM 9.0 VID Range

POWER MANAGEMENT

Description

The SC2655 is a synchronous-buck switch-mode con-

troller designed for use in single ended power supply ap-

plications where efficiency is the primary concern. The

controller is a hysteretic type, with a user selectable hys-

teresis. The SC2655 is ideal for implementing DC/DC

converters needed to power advanced microprocessors

such as Pentium

廬

llI and Athlon

廬

, in both single and mul-

tiple processor configurations. Inhibit, under-voltage lock-

out and soft-start functions are included for controlled

power-up.

SC2655 features include an integrated 5 bit D/A con-

verter, temperature compensated voltage reference,

current limit comparator, over-current protection, and an

adaptive deadtime circuit to prevent shoot-through of

the power MOSFET during switching transitions. Power

good signaling, logic compatible shutdown, and over-volt-

age protection are also provided. The integrated D/A

converter provides programmability of output voltage

from 1.1V to 1.85V in 25mV increments.

The SC2655 high side driver can be configured as either

a ground-referenced or as a floating bootstrap driver.

The high and low side MOSFET drivers have a peak cur-

rent rating of 2 amps.

SC2655

Features

Programmable hysteresis

5 bit DAC programmable output (1.1V-1.85V)

On-chip power good and OVP functions

Designed to meet latest Intel specifications

Up to 95% efficiency

VIDs pulled up to +3.3V

Applications

Server Systems and Workstations

Pentium

廬

III Core Supplies

AMD Athlon

廬

Core Supplies

Multiple Microprocessor Supplies

Voltage Regulator Modules

Typical Application Circuit

+5V

DROOP

VID0

SC2655

IOUT

PWRGD

0.1

INHIB

OCP

VID1

R11

0.1

10k

R10

PWRGD

"POWER GOOD"

"INHIBIT"

0.1

0.001

VHYST

VID2

VREFB

VID3

0.5uH

20k

VSENSE

VID4

Cin

Bulk

Vin +5V/12V

AGND

INHIBIT

0.1

+5V

SOFTST

IOUTLO

0.033

N/C

LOSENSE

0.01

LODRV

HISENSE

LOHIB

BOOTLO

R12

1.0

FDB6035AL

DRVGND

HIGHDR

LOWDR

BOOT

+12V

1.0

FDB7030BL

R14

1.6

1.0uH

Cout

Bulk

Cout

DRV

VIN12V

1.10 to 1.825V

C10

10k

*) for the values see specific application circuit somewhere else in the datasheet

Revision: December 10, 2003

www.semtech.com

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