IRF7457 datasheet(1/21 Pages) IRF

Part #	IRF7457

Description	8-PIN SYNCHRONOUS PWM CONTROLLER

PDF	21 Pages

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Manufacturer	IRF [International Rectifier]

Direct Link	http://www.irf.com

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1 / 21 page

IRU3037 / IRU3037A

1

Rev. 2.8

03/10/03

www.irf.com

TYPICAL APPLICATION

DESCRIPTION

The IRU3037 controller IC is designed to provide a low

cost synchronous Buck regulator for on-board DC to DC

converter applications. With the migration of today’s ASIC

products requiring low supply voltages such as 1.8V and

lower, together with currents in excess of 3A, traditional

linear regulators are simply too lossy to be used when

input supply is 5V or even in some cases with 3.3V

input supply. The IRU3037 together with dual N-channel

MOSFETs such as IRF7313, provide a low cost solution

for such applications. This device features an internal

200KHz oscillator (400KHz for "A" version), under-volt-

age lockout for both Vcc and Vc supplies, an external

programmable soft-start function as well as output un-

der-voltage detection that latches off the device when an

output short is detected.

Synchronous Controller in 8-Pin Package

Operating with single 5V or 12V supply voltage

Internal 200KHz Oscillator

(400KHz for IRU3037A)

Soft-Start Function

Fixed Frequency Voltage Mode

500mA Peak Output Drive Capability

Protects the output when control FET is shorted

PACKAGE ORDER INFORMATION

FEATURES

8-PIN SYNCHRONOUS PWM CONTROLLER

APPLICATIONS

DDR memory source sink Vtt application

Low cost on-board DC to DC such as 5V to 3.3V,

2.5V or 1.8V

Graphic Card

Hard Disk Drive

TA (°C)

DEVICE

PACKAGE

FREQUENCY

0 To 70

IRU3037CF

8-Pin Plastic TSSOP (F)

200KHz

0 To 70

IRU3037CS

8-Pin Plastic SOIC NB (S)

200KHz

0 To 70

IRU3037ACF

8-Pin Plastic TSSOP (F)

400KHz

0 To 70

IRU3037ACS

8-Pin Plastic SOIC NB (S)

400KHz

Data Sheet No. PD94173

Figure 1 - Typical application of IRU3037 or IRU3037A.

IRU3037

U1

Vcc

Vc

HDrv

LDrv

Fb

Gnd

Comp

SS/SD

C3

1uF

C4

1uF

C8

0.1uF

C9

2200pF

R4

24k

Q1

1/2 of IRF7313

Q2

1/2 of IRF7313

R5

1.24K, 1%

R3

249, 1%

L2

D05022P-562, 5.6uH, 5.3A

L1

1uH

C2

10TPB100M,

100uF, 55m

V

C1

47uF

1.5V/5A

C7

2x 6TPC150M,

150uF, 40m

V

12V

5V

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