FAN1539 Fairchild Semiconductor, FAN1539 Datasheet

FAN1539

Manufacturer Part Number

FAN1539

Description

1A/1.3A/ LDO With Low Quiescent Current

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN1539.pdf (15 pages)

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Features

• Very Low Ground Current (I

• Excellent Line Regulation

• Excellent Load Regulation

• Very Low Transient Overshoot

• Stable with low ESR Output Capacitor (ESR = 0m )

• Thermal Shutdown

• Current Limit

• Output Options: 3.3V and 1.8V

Applications

• Disk Drive Circuits

• Desktop Computers

• Laptop, Notebook Computers

• General purpose Three Terminal Regulator

Block Diagram

Notes:

1. No connection for FAN1540MMPX.

2. V

FAN1539/FAN1540

1A/1.3A, LDO With Low Quiescent Current

SEN

available for FAN1540MMPX.

SRART-UP

CIRCUIT

GND

REFERENCE

BANDGAP

= 1mA)

AMPLIFIER

ERROR

SHUTDOWN

THERMAL

Description

The FAN1539/FAN1540 series of high current LDO (1.0A

and 1.3A) has been developed for portable applications

where low quiescent current is an important requirement.

The device features excellent line and load transient response

which does not exceed 10% of nominal output value for full

operating temperature range even during power ON cycle

and short circuit removal. Internally trimmed, temperature

compensated bandgap reference guarantees 2.5% accuracy

for full range of input voltage, output current and tempera-

ture. Included on the chip are accurate current limit and ther-

mal shutdown protection. Device stability is achieved with

only two external low ESR ceramic capacitors.

The FAN1539/FAN1540 is available in thermally enhanced

3x3mm 6-lead MLP, 5x6mm 8-lead MLP package and

3-lead TO-252 packages. The 5x6mm MLP package version

features separate Kelvin sense pin for high precision applica-

tions.

CURRRENT

LIMIT

www.fairchildsemi.com

REV. 1.0.8 3/22/04

(Note1)

OUT

SENSE

(Note2)

GND

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