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LTC1753CG

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

Linear Technology 

LTC1753

TYPICAL APPLICATIO

CPU

5V

1.8k

DALE

NTHS-1206N02

MOUNT THERMISTER

IN CLOSE THERMAL

PROXIMITY TO Q1

VIN

5V

0.1µF

+

10µF

820Ω

1N5817

5.6k 5.6k

PWRGD VCC

IMAX PVCC

G1

FAULT

5

IFB

VID0 TO VID4

LTC1753

G2

OUTEN

COMP

C1

RC

150pF 15k

SS SGND

VFB

GND SENSE

0.1µF

20Ω

270pF

+ CIN**

1200µF

×3

LO†

Q1* 1.3µH

14A

+ COUT††

Q2* 2700µF

×5

CC

CSS

4700pF 0.1µF

* SILICONIX Si4410

1µF

** SANYO 10MV1200GX

† PANASONIC ETQP 6FIR3LFA

†† SANYO 6MV2700GX

VOUT

14A

1753 F11

Figure 11. Single Supply LTC1753 5V to 1.3V-3.5V Application with Thermal Monitor

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No RSENSE and PolyPhase are trademarks of Linear Technology Corporation.

COMMENTS

SO-8 with Current Limit, No RSENSETM Saves Space, Fixed Frequency

Ideal for 5V to 3.3V or Lower

Constant Frequency, Standby 5V and 3.3V LDOs, 3.5V ≤ VIN ≤ 36V

DAC Code Conforms to the Intel Pentium II Processor VRM8.2

DC/DC Converter Specification

GTL+ Power Supplies

Expandable Up to 12 Phases, 28-Lead SSOP, Up to 200A

Mobile VID Code, Each Output Up to 15A, VIN = 5V for I/O and Core

Desktop Pentium III Processors, VIN ≤ 7V

Current Mode, VIN to 36V, IOUT Up to 42A

Drives Synchronous N-Channel FETs, VIN ≤ 36V

100% Duty Cycle, Up to 4A, 2.2V to 9.8V VIN

Desktop VID Codes, IOUT Up to 25A on Each Channel, 28-Lead SSOP

Current Mode Ensures Accurate Current Sensing, VIN Up to 36V,

IOUT Up to 42A, 28-Lead SSOP

24 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com

1753f LT/TP 0400 4K • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1998

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