LT1576 Linear Technology, LT1576 Datasheet

LT1576

Manufacturer Part Number

LT1576

Description

1.5A/ 200kHz Step-Down Switching Regulator

Manufacturer

Linear Technology

Datasheets

1.LT1576.pdf (28 pages)

2.LT1576.pdf (28 pages)

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FEATURES

APPLICATIO S

TYPICAL

** INCREASE L1 TO 30 H FOR LOAD

* RIPPLE CURRENT RATING I

CURRENTS ABOVE 0.6A AND TO

60 H ABOVE 1A

SEE APPLICATIONS INFORMATION

Constant 200kHz Switching Frequency

1.21V Reference Voltage

Fixed 5V Output Option

Easily Synchronizable

Uses All Surface Mount Components

Inductor Size Reduced to 15 H

Saturating Switch Design: 0.2

Effective Supply Current: 1.16mA

Shutdown Current: 20 A

Cycle-by-Cycle Current Limiting

Fused Lead SO-8 Package

Portable Computers

Battery-Powered Systems

Battery Charger

Distributed Power

6V TO 25V

INPUT

10 F TO

OPEN = ON

50 F

C3*

APPLICATION

OUT

SHDN

5V Buck Converter

GND

LT1576

BOOST

BIAS

0.33 F

100pF

1N5818

15 H

L1**

4.99k

15.8k

1N914

1576 TA01

100 F, 10V

SOLID

TANTALUM

OUTPUT**

5V, 1.25A

DESCRIPTIO

The LT

regulator. A 1.5A switch is included on the die along with

all the necessary oscillator, control and logic circuitry. The

topology is current mode for fast transient response and

good loop stability. The LT1576 is a modified version of the

industry standard LT1376 optimized for noise sensitive

applications.

In addition, the reference voltage has been lowered to

allow the device to produce output voltages down to 1.2V.

Quiescent current has been reduced by a factor of two.

Switch on resistance has been reduced by 30%. Switch tran-

sition times have been slowed to reduce EMI generation.

The oscillator frequency has been reduced to 200kHz to

maintain high efficiency over a wide output current range.

The pinout has been changed to improve PC layout by

allowing the high current high frequency switching cir-

cuitry to be easily isolated from low current noise sensitive

control circuitry. The new SO-8 package includes a fused

ground lead which significantly reduces the thermal resis-

tance of the device to extend the ambient operating tem-

perature range. There is an optional function of shutdown

or synchronization. Standard surface mount external parts

can be used including the inductor and capacitors.

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

1.5A, 200kHz Step-Down

1576 is a 200kHz monolithic buck mode switching

Switching Regulator

100

L = 33 H

OUT

Efficiency vs Load Current

0.25

= 10V

= 5V

LT1576/LT1576-5

0.50

LOAD CURRENT (A)

0.75

1.00

1.25

1576 TA02

1.50

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