SC2659SWTR Datasheet

IC型號：
SC2659SWTR
PDF描述：
Programmable Synchronous DC/DC Hysteretic Controller with VR...
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20頁
芯片廠家：
SEMTECH

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Programmable Synchronous DC/DC

Hysteretic Controller with VRM 8.5 VID Range

POWER MANAGEMENT

Description

The SC2659 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 SC2659 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.

SC2659 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 1.050V to 1.825V in 25mV increments.

The SC2659 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.

SC2659

Features

Programmable hysteresis

5 bit DAC programmable output (1.050V-1.825V)

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

SC2659

IOUT

PWRGD

10k

R10

PWRGD

"POWER GOOD"

0.1

INHIB

OCP

VID1

"INHIBIT"

R11

0.1

VHYST

VID2

0.1

0.001

VREFB

VID3

0.5uH

20k

VSENSE

VID25

Cin

Bulk

AGND

INHIBIT

Vin +5V/12V

SOFTST

IOUTLO

0.033

0.1

+5V

N/C

LOSENSE

LODRV

HISENSE

0.01

LOHIB

BOOTLO

FDB6035AL

R12

1.0

DRVGND

HIGHDR

LOWDR

BOOT

+12V

1.0uH

1.0

FDB7030BL

R14

1.6

Cout

Bulk

Cout

DRV

VIN12V

1.05 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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