LTC1735I-1 Linear Technology, LTC1735I-1 Datasheet

LTC1735I-1

Manufacturer Part Number

LTC1735I-1

Description

High Efficiency Synchronous Step-Down Switching Regulator

Manufacturer

Linear Technology

Datasheet

1.LTC1735I-1.pdf (28 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.

Pentium is a registered trademark of Intel Corporation. SpeedStep is a trademark of Intel

Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Notebook and Palmtop Computers, PDAs

Power Supply for Mobile Pentium

SpeedStep

Cellular Telephones and Wireless Modems

Dual N-Channel MOSFET Synchronous Drive

Programmable/Synchronizable Fixed Frequency

Wide V

Very Low Dropout Operation: 99% Duty Cycle

OPTI-LOOP

Power Good Output Voltage Monitor

Internal Current Foldback

Output Overvoltage Crowbar Protection

Latched Short-Circuit Shutdown Timer

with Defeat Option

Optional Programmable Soft-Start

Remote Output Voltage Sense

Logic Controlled Micropower Shutdown: I

Available in 16-Lead Narrow SSOP and SO Packages

OUT

1% Output Voltage Accuracy

Range: 0.8V to 7V

Range: 3.5V to 36V Operation

Figure 1. CPU Core DC/DC Converter with Dynamic Voltage Selection from SpeedStep Enabled Processors

47pF

OSC

Technology

330pF

Compensation Minimizes C

47pF

0.1 F

33k

1000pF

PGOOD

RUN/SS

PGOOD

SENSE

SGND

OSC

OSENSE

LTC1735-1

–

III Processor with

EXTV

INTV

BOOST

PGND

OUT

< 25 A

(OPTIONAL)

CMDSH-3

4.7 F

0.22 F

4.5V TO 24V

DESCRIPTIO

The LTC

regulator controller optimized for CPU power. OPTI-LOOP

compensation allows the transient response to be opti-

mized over a wide range of output capacitance and ESR

values.

The operating frequency (synchronizable up to 500kHz) is

set by an external capacitor allowing maximum flexibility

in optimizing efficiency. The output voltage is monitored

by a power good window comparator that indicates when

the output is within 7.5% of its programmed value, con-

forming to Intel Mobile CPU Specifications.

Protection features include internal foldback current lim-

iting, output overvoltage crowbar and optional short-

circuit shutdown. Soft-start is provided by an external

capacitor that can be used to properly sequence supplies.

The operating current level is user-programmable via an

external current sense resistor. Wide input supply range

allows operation from 3.5V to 30V (36V maximum).

Pin defeatable Burst Mode

efficiency at low load currents while 99% duty cycle

provides low dropout operation.

MBRS340T3

Q2, Q3

FDS6680A

Synchronous Step-Down

1.2 H

1735-1 is a synchronous step-down switching

0.004

Switching Regulator

SENSE

22 F

50V

CERAMIC

14.3k

0.5%

47pF

L1: PANASONIC ETQP6RZ1R20HFA

High Efficiency

OUT

SENSE

10k

0.5%

33.2k

: MARCON THCR70E1H226ZT

: PANASONIC EEFUE06181R

2N7002

: IRC CRF2010-01-R004J

1735-1 F01

operation provides high

180 F

PANASONIC SP

1.35V TO 1.60V

12A

GND

OUT

SEL

LTC1735-1

= 1: V

= 0: V

OUT

= 1.60V

= 1.35V

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