POWER MANAGEMENT

1

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SC4201

Multi-Phase Link Controller

Features

Revision: September 17, 2004

The SC4201 is a multi-phase link controller, ideal for iso-

lated and non-isolated applications. Its frequency of op-

eration can be programmed in excess of 2MHz per phase

(oscillator frequency = phase frequency times number

of phases 3 or 4) and can be easily synchronized to an

external faster frequency. The SC4201 output frequen-

cies can be set to 2/4 or 3 phase operation. A single pin

can either set a 4 phase operation (each phase is 90

degrees apart) or 3 phase operation (120 degrees apart).

Multi-phase operation of multiple primary or secondary

controllers reduces input/output ripple, the number of

components required for filtering, and noise due to fre-

quency beating generated by multiple free running oscil-

lators.

The SC4201 is available in the MSOP-8 surface mount

package.

Small footprint MSOP-8

Programmable frequency > 2MHz, each phase

Synchronized to faster frequency

Programmable 2/4 or 3 phase operation

Telecom distributed power architectures

Multi-phase operation of isolated power supplies

Multi-phase operation of non-isolated switching

regulators

Typical Application Circuit

Description

Applications

RT

1

SYNC

2

VDD

3

D

7

GND

8

B

5

C

6

A

4

U1

SC4201

Ph A

Ph B

Ph C

Ph D

Sync

R1

5K

C1

0.1

+3 to 6V

VDD for 3 Phase