LTC1873EGPBF Linear Technology Corporation, LTC1873EGPBF Datasheet

LTC1873EGPBF

Manufacturer Part Number

LTC1873EGPBF

Description

SSOP28

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1873EGPBF.pdf (32 pages)

2.LTC1873EGPBF.pdf (32 pages)

Specifications of LTC1873EGPBF

Date_code

11+

Current page: 1 of 32
Download datasheet (319Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

4.5V TO 5.5V

Two Independent PWM Controllers in One Package

Side 1 Output Is Compliant with Intel Desktop

VRM 8.4 Specifications (Includes 5-Bit VID DAC)

1.3V to 3.5V Output Voltage with 50mV/100mV Steps

Two Sides Run Out-of-Phase to Minimize C

All N-Channel External MOSFET Architecture

No External Current Sense Resistors Required

Precison Internal 0.8V 1% Reference

550kHz Switching Frequency Minimizes External

Component Size

Very Fast Transient Response

Up to 25A Output Current per Channel

Low Shutdown Current: < 100 A

Small 28-Pin SSOP Package

Microprocessor Core and I/O Supplies

Multiple Logic Supply Generator

High Efficiency Power Conversion

Chipset Power Supply

STBY/ON

0.1%

10k

QSS1

68k

56k

4.75k

0.1%

330pF

5-BIT VID

QSS2

220pF

10 F

0.1 F

56pF

39pF

Low Cost Desktop CPU Supply with RDRAM Keepalive

FB2

COMP2

RUN/SS2

RUN/SS1

SENSE

FB1

COMP1

FCB

VID4:0

SGND

LTC1873

BOOST2

BOOST1

PGND

FAULT

MAX2

MAX1

SW2

SW1

TG2

BG2

TG1

BG1

47k

33k

2-Phase Switching Regulator

QT2

QB2

MBR0530T

DESCRIPTIO

Burst Mode is a trademark of Linear Technology Corporation.

The LTC

mized for high efficiency with low input voltages. It includes

two complete, on-chip, independent switching regulator con-

trollers. Each is designed to drive a pair of external

N-channel MOSFETs in a voltage mode feedback, synchro-

nous buck configuration. The LTC1873 includes digital out-

put voltage adjustment on side 1 that conforms to the Intel

Desktop VID specification. A constant-frequency, true PWM

design minimizes external component size and cost and

optimizes load transient performance. The synchronous buck

architecture automatically shifts to discontinuous and then to

Burst Mode

ing maximum efficiency over a wide range of load currents.

The LTC1873 features an onboard reference trimmed to 1%

and delivers better than 1.5% regulation at the converter

outputs over all combinations of line, load and temperature.

Each channel can be enabled independently; with both chan-

nels disabled, the LTC1873 shuts down and supply current

drops below 100 A.

QB1B

QT1B

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

Dual 550kHz Synchronous

1 F

QT1A

QB1A

Controller with 5-Bit VID

1873 is a dual switching regulator controller opti-

1 F

MBR0530T

1 F

operation as the output load decreases, ensur-

GND

LT1761

OUT

ADJ

1873 TA01

16.2k

0.1%

16.9k

0.1%

OUT1

OUT2

2.5V/7A

2.45V/100mA STANDBY

1.3V TO 3.5V

20A

L1: 1 H SUMIDA CEP125-1R0MC-H

L2: 2.2 H COILTRONICS UP2B-2R2

QSS1, QSS2: MOTOROLA MMBT3904LT1

QT1A, QT1B, QB1A, QB1B: FAIRCHILD FDS6670A

QT2, QB2: 1/2 SILICONIX Si4966

RDRAM

CORE

OUT1

OUT2

= SANYO 10MV1200GX (6 IN PARALLEL)

= SANYO 6MV1500GX (8 IN PARALLEL)

= SANYO 6MV1500GX (3 IN PARALLEL)

LTC1873

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