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SC1182

Programmable Synchronous DC/DC Converter, Dual LDO Controller

Semtech Corporation 

POWER MANAGEMENT

Description

SC1182 & SC1183

Programmable Synchronous DC/DC

Converter, Dual LDO Controller

Features

The SC1182/3 combines a synchronous voltage mode con-

troller 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® II .

The SC1182/3 switching section features an integrated 5

bit D/A converter, pulse by pulse current limiting, inte-

grated power good signaling, and logic compatible shut-

down. The SC1182/3 switching section operates at a fixed

frequency of 200kHz, providing an optimum compromise

between size, efficiency and cost in the intended applica-

tion areas. The integrated D/A converter provides pro-

grammability of output voltage from 2.0V to 3.5V in 100mV

increments and 1.30V to 2.05V in 50mV increments with

no external components.

The SC1182/3 linear sections are low dropout regulators.

The SC1182 supplies 1.5V for GTL bus and 2.5V for non-

GTL I/O, the SC1183 features adjustable LDO voltages.

u Synchronous design, enables no heatsink solution.

u 95% efficiency (switching section).

u 5 bit DAC for output programmability.

u On chip power good function.

u Designed for Intel Pentium® ll VRM8.1 requirements.

u 1.5V, 2.5V or Adjustable @ 1% for linear section.

Applications

u Pentium® ll microprocessor supplies

u Flexible motherboards

u 1.3V to 3.5V microprocessor supplies

u Programmable triple power supplies

Typical Application Circuit

12V

5V

+

1500uF

x2

PWRGOOD

VID0

VID1

VID2

VID3

VID4

EN

3.3V

10

0.1uF

U4

5 VCC

7 PWRGOOD

CS+ 9

CS- 8 0.1uF

22 VID0

VOSENSE 17

IRLR3103N

21 VID1

20 VID2

BSTH 15

DH 11

2R2

19 VID3

BSTL 14

IRLR3103N

18 VID4

16 EN

DL 13

PGNDH 10

2R2

1 AGND

PGNDL 12

23 LDOV

OVP 6

24 GATE2

GATE1 2

4 LDOS2

LDOS1 3

SC1182/3CSW

0.1uF

+

4.7uF

1.9uH

OVP

1.00k

2.32k

5mOhm

VCC_CORE

+

1500uF

x4

0.1uF

330uF

+

IRLR024N

+

330uF

1.5V

2.5V

+

330uF

IRLR024N

Revision 1, January 2001

1

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