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LTC1553CG

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor

Linear Technology 

LTC1553

TYPICAL APPLICATION

PENTIUM II

SYSTEM

+

10µF

5.6k 5.6k

VCC

5V

10Ω 1N5817

0.1µF

1N5248B

18V

0.1µF

VCC

PWRGD

PVCC

5.1k

IMAX

FAULT

G1

5

NC

OT

VID0 TO VID4

OUTEN

C1

180pF

COMP SS

RC

6.2k

CSS

CC

0.1µF

0.022µF

LTC1553

IFB

SGND

G2

GND SENSE

0.1µF

20Ω

1N5245B

15V

VIN

12V

+ CIN**

1000µF

×4

Q1*

LO†

4µH

18A

+ COUT††

330µF

Q2*

×6

vOUT

* MOTOROLA MTD20N03HDL

** SANYO 16MV1000GX

† COILTRONICS CTX02-13199

†† AVX TPSE337M006R0100

1553 F14

Figure 14. External Clock Synchronized 12V to 1.8V-3.5V Application

RELATED PARTS

PART NUMBER DESCRIPTION

LTC1142

Current Mode Dual Step-Down Switching Regulator Controller

LTC1148

Current Mode Step-Down Switching Regulator Controller

LTC1149

Current Mode Step-Down Switching Regulator Controller

LTC1159

Current Mode Step-Down Switching Regulator Controller

LTC1266

Current Mode Step-Up/Down Switching Regulator Controller

LTC1430

High Power Step-Down Switching Regulator Controller

LTC1435

High Efficiency Low Noise Synchronous Step-Down

Switching Regulator

LTC1438

Dual High Efficiency Low Noise Synchronous Step-Down

Switching Regulator

COMMENTS

Dual Version of LTC1148

Synchronous, VIN ≤ 20V

Synchronous, VIN ≤ 48V, for Standard Threshold FETs

Synchronous, VIN ≤ 40V, for Logic Threshold FETs

Synchronous N- or P-Channel FETs, Comparator/Low-Battery Detector

Synchronous N-Channel FETs, Voltage Mode

Drive Synchronous N-Channel, VIN ≤ 36V

Dual LTC1435 with Power-On Reset

24 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900

FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com

1553f LT/TP 0198 4K • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1997

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