IRU3146CFTR International Rectifier, IRU3146CFTR Datasheet

IRU3146CFTR

Manufacturer Part Number

IRU3146CFTR

Description

IC PWM DUAL SYNC 28-TSSOP

Manufacturer

International Rectifier

Datasheets

1.IRU3146CFTR.pdf (15 pages)

2.IRU3146CFTR.pdf (30 pages)

Specifications of IRU3146CFTR

Pwm Type

Voltage Mode

Number Of Outputs

Frequency - Max

345kHz

Duty Cycle

85%

Voltage - Supply

4.5 V ~ 16 V

Buck

Yes

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Operating Temperature

0°C ~ 70°C

Package / Case

28-TSSOP

Frequency-max

345kHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Download datasheet (239Kb)

Rev. 1.1

6/25/04

FEATURES

APPLICATIONS

PACKAGE ORDER INFORMATION

Telecom Systems

Dual Synchronous Controller with 180 out-of-phase

Configurable to 2-Independent Outputs or 2-Phase

Single Output

Current Sharing Using Inductor's DCR

Current Limit using MOSFET's R

Hiccup/Latched Current Limit

Latched Over-Voltage Protection

Vcc from 4.5V to 16V Input

Programmable Switching Frequency up to 500KHz

Two Independent Soft-Starts/ Shutdowns

0.8V Precision Reference Voltage Available

Power Good Output

External Frequency Synchronization

Embedded Computer Systems

12V

Point of Load Power Architectures

PGood

Figure 1 - Typical application of IRU3146 in 2-phase configuration with inductor current sensing

C10

CURRENT SHARING CIRCUITRY AND AUTO-RESTART

DUAL SYNCHRONOUS PWM CONTROLLER WITH

Sync

Comp1

Vcc

Hiccup

Comp2

PGood

SS2 / SD

SS1 / SD

DS(ON)

REF

IRU3146CF

DEVICE

C12

VcH1

IRU3146

OUT3

OCSet1

OCSet2

PGnd2

PGnd1

HDrv2

HDrv1

LDrv2

LDrv1

VcH2

Gnd

SEN1

SEN2

Fb1

Fb2

www.irf.com

C13

DESCRIPTION

The IRU3146 IC combines a Dual synchronous Buck

controller, providing a cost-effective, high performance

and flexible solution. The IRU3146 can configured as 2-

independent or as 2-phase controller. The 2-phase con-

figuration is ideal for high current applications. The

IRU3146 features 180 out of phase operation which re-

duces the required input/output capacitance and results

to few number of capacitor quantity. Other key features

offered by this device include two independent program-

mable soft starts, programmable switching frequency up

to 500KHz per phase, under voltage lockout function.

The current limit is provided by sensing the lower

MOSFET's on-resistance for optimum cost and perfor-

mance.

28-Pin TSSOP (F)

PACKAGE

Graphic Card

DDR Memory Applications

2-Phase Power Suppl

BAT54A

C17

C14

C11

Data Sheet No.PD 94702

C15

C18

IRU3146

R10

R11

C16

1.8V @ 30A

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