FAN1538 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN1538

Dual Channel 1A Low Dropout Linear Regulator with UVLO and Soft-start

Fairchild Semiconductor 

www.fairchildsemi.com

FAN1538

Dual Channel 1A Low Dropout

Linear Regulator with UVLO and Soft-start

Features

• Two independent outputs

• Load regulation: 0.05% typical

• Under-voltage lockout and softstart

• Over Temperature protection

• T0-252 DPAK, 5-lead SPAK packages

• Fixed 3.3V and adjustable or fixed 2.5V output

Applications

• Hard Disk Drives, CD-Roms

• Set-top Boxes

• ADSL line cards

• Motherboards with multiple supplies

General Description

The FAN1538 provides two output voltages: a fixed 3.3V

ouput and either a fixed 2.5V or adjustable output with 1A

output current capability. Refer to Ordering Information for

details.

Current limit protects against short circuit currents and on

chip over temperature circuitry limits the maximum die tem-

perature.

Under voltage lockout and softstart circuitry protects against

unregulated output voltages when the input voltage is below

specification.

Block Diagram

VIN = 5V

+

22µF

FAN1538A

V1

VIN

V2

NC GND

3.3V at 1.0A

+

22µF

2.5V at 1.0A

+

22µF

VIN = 5V

22 µF

FAN1538B

V1

V2

GND FB

R1

250

R2

1250

22µF

3.3V at 1.0A

1.5V at 1.0A

22µF

V2 = VREF (1 + R1/R2)

REV. 1.0.2 12/17/03

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