LT1506 Linear Technology, LT1506 Datasheet

LT1506

Manufacturer Part Number

LT1506

Description

4.5A/ 500kHz Step-Down Switching Regulator

Manufacturer

Linear Technology

Datasheets

1.LT1506.pdf (24 pages)

2.LT1506.pdf (24 pages)

3.LT1506.pdf (24 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Constant 500kHz Switching Frequency

Easily Synchronizable

Operates with Input as Low as 4V

Uses All Surface Mount Components

Inductor Size Reduced to 1.8 H

Saturating Switch Design: 0.07

Shutdown Current: 20 A

Cycle-by-Cycle Current Limiting

Portable Computers

Battery-Powered Systems

Battery Charger

Distributed Power

INPUT

CERAMIC

10 F TO

50 F

OPEN

HIGH

= ON

5V to 3.3V Down Converter

SHDN

GND

LT1506-3.3

BOOST

SENSE

0.68 F

1.5nF

MBRS330T3

1N914

5 H

1506 TA01

100 F, 10V

SOLID

TANTALUM

DESCRIPTIO

The LT

regulator functionally identical to the LT1374 but optimized

for lower input voltage applications. It will operate over a

4V to 15V input range compared with 5.5V to 25V for the

LT1374. A 4.5A switch is included on the die along with all

the necessary oscillator, control and logic circuitry. High

switching frequency allows a considerable reduction in the

size of external components. The topology is current mode

for fast transient response and good loop stability. Both

fixed output voltage and adjustable parts are available.

A special high speed bipolar process and new design tech-

niques achieve high efficiency at high switching frequency.

Efficiency is maintained over a wide output current range

by keeping quiescent supply current to 4mA and by utiliz-

ing a supply boost capacitor to saturate the power switch.

The LT1506 fits into standard 7-pin DD and fused lead

SO-8 packages. Full cycle-by-cycle short-circuit protection

and thermal shutdown are provided. Standard surface

mount external parts are used, including the inductor and

capacitors. There is the optional function of shutdown or

synchronization. A shutdown signal reduces supply current

to 20 A. Synchronization allows an external logic level sig-

nal to increase the internal oscillator from 580kHz to 1MHz.

OUTPUT

3.3V

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

4.5A, 500kHz Step-Down

1506 is a 500kHz monolithic buck mode switching

Switching Regulator

0.5

Efficiency vs Load Current

1.0

LOAD CURRENT (A)

1.5

2.0

2.5

L = 10 H

3.0

OUT

LT1506

= 5V

= 3.3V

3.5

1506 TA02

4.0

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