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Programmable Synchronous DC/DC

Converter, Dual LDO Controller

POWER MANAGEMENT

Description

The SC2688 combines a synchronous voltage mode

controller with two low-dropout linear regulators

providing most of the circuitry necessary to implement three

DC/DC converters for powering advanced microprocessors

such as Pentium

廬

III.

The SC2688 switching section features latched drive out-

put for enhanced noise immunity, pulse by pulse current

limiting and logic compatible shutdown. The SC2688

switching section operates at a fixed frequency of 140kHz,

providing an optimum compromise between size, efficiency

and cost in the intended application areas.

The SC2688 linear sections are low dropout regulators

with short circuit protection, supplying 1.5V for GTL bus

and 2.5V for non-GTL I/O.

SC2688

Features

路Synchronous design, enables no heatsink solution

95% efficiency (switching section)

Designed for embedded Pentium

廬

III requirements

1.5V, 2.5V short circuit protected linear controllers

Applications

Embedded Pentium

廬

III microprocessor supplies.

Typical Application Circuit

12V

+

5V

+

1500uF

x4

47uF

0.1uF

10

11

4

BST

VCC

LDOEN

EN

AGND

LDOV

GATE2

LDOS2

CS+

CS-

DH

DL

FB

PGND

GATE1

LDOS1

7

6

8

10

13

9

1

2

0.1uF

0.1uF

2R2

2R2

1.00k

1.9uH

2.32k

VCC_CORE

5mOhm

EN

0.1uF

5

12

16

14

15

3

+

0.1uF

SC2688S

3.3V

1k

+

330uF

+

330uF

330uF

+

1.5V

2.5V

1500uF

x6

Revision: March 25, 2004

1

www.semtech.com

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