LT1528CQPBF Linear Technology Corporation, LT1528CQPBF Datasheet

LT1528CQPBF

Manufacturer Part Number

LT1528CQPBF

Description

TO-263

Manufacturer

Linear Technology Corporation

Datasheets

1.LT1528CQPBF.pdf (12 pages)

2.LT1528CQPBF.pdf (12 pages)

Specifications of LT1528CQPBF

Date_code

10+

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

Microprocessor Applications

Post Regulator for Switching Supplies

5V to 3.3V Logic Regulator

Dropout Voltage: 0.6V at I

Fast Transient Response

Output Current: 3A

Quiescent Current: 400μA

No Protection Diodes Needed

Fixed Output Voltage: 3.3V

Controlled Quiescent Current in Dropout

Shutdown I

Stable with 3.3μF Output Capacitor

Reverse Battery Protection

No Reverse Output Current

Thermal Limiting

SHDN

<0.25

>2.80

(PIN 4)

=5V

SHDN

OUTPUT

Microprocessor Supply with Shutdown

OFF

= 125μA

LT1528

GND

SENSE

OUT

SHORTING

OUT

330Ω

= 3A

3.30

3.45

4.00

OUT

15Ω

*CHOOSE CAPACITORS

68Ω

TO MEET PROCESSOR

REQUIREMENTS

for Microprocessor Applications

4 × 47μF*

SOLID TANTALUM

1528 TA01

OUT

DESCRIPTION

3A Low Dropout Regulator

The LT

handle the large load current transients associated with

the current generation of microprocessors. This device has

the fastest transient response of currently available PNP

regulators and is very tolerant of variations in capacitor

ESR. Dropout voltage is 75mV at 10mA, rising to 300mV

at 1A and 600mV at 3A. The device has a quiescent cur-

rent of 400μA. Quiescent current is well controlled; it does

not increase signiﬁ cantly as the device enters dropout.

The regulator can operate with output capacitors as small

as 3.3μF, although larger capacitors will be needed to

achieve the performance required in most microprocessor

applications. The LT1528 is available with a ﬁ xed output

voltage of 3.3V. An external SENSE pin allows adjustment

to output voltages greater than 3.3V, using a simple resis-

tive divider. This allows the device to be adjusted over a

wide range of output voltages, including the 3.3V to 4.2V

range required by a variety of processors from Intel, IBM,

AMD, and Cyrix.

The LT1528 has both reverse input and reverse output

protection and includes a shutdown feature. Quiescent

current drops to 125μA in shutdown. The LT1528 is avail-

able in 5-lead TO-220 and 5-lead DD-PAK packages.

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

1528 is a 3A low dropout regulator optimized to

0.6

0.5

0.4

0.3

0.2

0.1

0.5

Dropout Voltage

OUTPUT CURRENT (mA)

1.0

1.5

2.0

2.5

LT1528

3.0

1528 TA02

1528fb

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