SC1164 查看數據表（PDF） - Semtech Corporation

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SC1164

PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER

Semtech Corporation 

October 25, 1999

PROGRAMMABLE SYNCHRONOUS DC/DC

CONVERTER, DUAL LOW DROPOUT

REGULATOR CONTROLLER

SC1164/5

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC1164/5 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® II.

The SC1164/5 switching section features an integrated

5 bit D/A converter, pulse by pulse current limiting,

integrated power good signaling, and logic compatible

shutdown. The SC1164/5 switching section operates at

a fixed frequency of 200kHz, providing an optimum

compromise between size, efficiency and cost in the

intended application areas. The integrated D/A con-

verter provides programmability 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 SC1164/5 linear sections are low dropout regula-

tors. The SC1164 supplies 1.5V for GTL bus and 2.5V

for non-GTL I/O.

For the SC1165 both LDO’s are adjustable.

FEATURES

• Synchronous design, enables no heatsink solution

• 95% efficiency (switching section)

• 5 bit DAC for output programmability

• On chip power good function

• Designed for Intel Pentium® ll requirements

• 1.5V, 2.5V or Adj. @ 1% for linear section

APPLICATIONS

• Pentium® ll or Deschutes microprocessor supplies

• Flexible motherboards

• 1.3V to 3.5V microprocessor supplies

• Programmable triple power supplies

ORDERING INFORMATION

Part Number(1) Package

SC1164CSW SO-24

Linear

Voltage

Temp.

Range (TJ)

1.5V/2.5V 0° to 125°C

SC1165CSW SO-24

Adj. 0° to 125°C

Note:

(1) Add suffix ‘TR’ for tape and reel.

PIN CONFIGURATION

BLOCK DIAGRAM

Top View

AGND

1

GATE1

2

LDOS1

3

LDOS2

4

VCC

5

OVP

6

PWRGOOD

7

CS-

8

CS+

9

PGNDH 10

DH 11

PGNDL 12

24

GATE2

23

LDOV

22

VID0

21

VID1

20

VID2

19

VID3

18

VID4

17

VOSENSE

16

EN

15

BSTH

14

BSTL

13

DL

(24 Pin SOIC)

REF.

FET

CONTROLLER

2.5V/ADJ.

1.265V

REF.

LDOV

FET

CONTROLLER

1.5V/ADJ.

© 1999 SEMTECH CORP.

Pentium is a registered trademark of Intel Corporation

1

652 MITCHELL ROAD NEWBURY PARK CA 91320

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