lt1528ct-pbf Linear Technology Corporation, lt1528ct-pbf Datasheet

lt1528ct-pbf

Manufacturer Part Number

lt1528ct-pbf

Description

3a Low Dropout Regulator For Microprocessor Applications

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1528CT-PBF.pdf (12 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Dropout Voltage: 0.6V at I

Fast Transient Response

Output Current: 3A

Quiescent Current: 400 A

No Protection Diodes Needed

Fixed Output Voltage: 3.3V

Controlled Quiescent Current in Dropout

Shutdown I

Stable with 3.3 F Output Capacitor

Reverse Battery Protection

No Reverse Output Current

Thermal Limiting

Microprocessor Applications

Post Regulator for Switching Supplies

5V to 3.3V Logic Regulator

SHDN

<0.25

>2.80

(PIN 4)

=5V

SHDN

= 125 A

OUTPUT

OFF

Microprocessor Supply with Shutdown

LT1528

GND

SENSE

OUT

SHORTING

OUT

= 3A

330

3.30

3.45

4.00

OUT

*CHOOSE CAPACITORS

TO MEET PROCESSOR

REQUIREMENTS

for Microprocessor Applications

4 47 F*

SOLID TANTALUM

LT1528 • TA01

OUT

DESCRIPTIO

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 capaci-

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

300mV at 1A and 600mV at 3A. The device has a quiescent

current of 400 A. Quiescent current is well controlled; it

does not increase significantly as the device enters drop-

out. The regulator can operate with output capacitors as

small as 3.3 F, although larger capacitors will be needed

to achieve the performance required in most microproces-

sor applications. The LT1528 is available with a fixed

output voltage of 3.3V. An external SENSE pin allows

adjustment to output voltages greater than 3.3V, using a

simple resistive 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 125 A in shutdown. The LT1528 is

available in 5-lead TO-220 and 5-lead DD packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

1528 is a 3A low dropout regulator optimized to

0.6

0.5

0.4

0.3

0.2

0.1

0.5

OUTPUT CURRENT (mA)

Dropout Voltage

1.0

1.5

2.0

LT1528

2.5

LT1528 • TA02

3.0

1528fa

Related parts for lt1528ct-pbf

lt1528ct-pbf Summary of contents

Page 1

... Intel, IBM, AMD, and Cyrix. The LT1528 has both reverse input and reverse output protection and includes a shutdown feature. Quiescent current drops to 125 A in shutdown. The LT1528 is available in 5-lead TO-220 and 5-lead DD packages. , LTC and LT are registered trademarks of Linear Technology Corporation. V OUT + ...

Page 2

... LOAD I = 100mA LOAD I = 700mA LOAD I = 700mA LOAD I = 1.5A LOAD I = 1.5A LOAD LOAD LOAD ORDER PART NUMBER SHDN LT1528CT 3 GND 2 SENSE 1 OUTPUT = MIN TYP MAX UNITS 3.250 3.300 3.350 3.200 3.300 3.400 1 110 150 ...

Page 3

ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T PARAMETER GND Pin Current (Note 6) SENSE Pin Current (Notes 4, 8) SHDN Threshold SHDN Pin Current (Note 9) Quiescent Current ...

Page 4

LT1528 W U TYPICAL PERFOR A CE CHARACTERISTICS Guaranteed Dropout Voltage 1.0 = TEST POINTS 0.9 0.8 0.7 T 125 C J 0.6 0 0.4 0.3 0.2 0 0.5 1.0 1.5 2.0 2.5 3.0 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN Pin Threshold (Off-to-On) 2.0 1 1.6 LOAD 1.4 1 1mA LOAD 1.0 0.8 0.6 0.4 0.2 0 –50 – 100 125 TEMPERATURE ( ...

Page 6

LT1528 W U TYPICAL PERFOR A CE CHARACTERISTICS Ripple Rejection OUT SOLID TANTALUM OUT 30 SOLID TANTALUM 1.5A OUT ...

Page 7

CTIO S SHDN (Pin 4): This pin is used to put the device into shutdown. In shutdown the output of the device is turned off. This pin is active low. The device will be shut ...

Page 8

LT1528 U U APPLICATIO S I FOR ATIO The LT1528 is specified with the SENSE pin tied to the OUTPUT pin. This sets the output voltage to 3.3V. Speci- fications for output voltage greater than 3.3V will be proportional to ...

Page 9

U U APPLICATIO S I FOR ATIO The maximum junction temperature will be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or 31 81.4 C JMAX Output ...

Page 10

LT1528 U U APPLICATIO S I FOR ATIO The reverse output current will follow the curve in Figure 3 when the input is pulled to ground. This current flows through the OUTPUT pin to ground. The state of the SHDN ...

Page 11

... HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U ...

Page 12

... MEASURED AT THE SEATING PLANE T5 (TO-220) 0399 COMMENTS >90% Efficient 1A 3.3V Conversion >90% Efficient High Current Microprocessor Supply 15 A Quiescent Current For High Performance Microprocessors For High Performance Microprocessors LT/TP 1201 1.5K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 1528fa ...

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