lt1176csw-pbf Linear Technology Corporation, lt1176csw-pbf Datasheet

lt1176csw-pbf

Manufacturer Part Number

lt1176csw-pbf

Description

Step-down Switching Regulator

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1176CSW-PBF.pdf (4 pages)

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FEATURE

The LT1176 is a 1A monolithic bipolar switching regulator

which requires only a few external parts for normal opera-

TYPICAL

10V T0 35V

PPLICATI

ESCRIPTIO

Buck Converter with Output Voltage Range of

2.5V to 30V

Positive-to-Negative Converter

Negative Boost Converter

Mulitple Output Buck Converter

1.2A On-Board Switch

100kHz Switching Frequency

Excellent Dynamic Behavior

DIP and Surface Mount Packages

Only 8mA Quiescent Current

Preset 5V Output Available

Operates Up to 35V Input

Micropower Shutdown Mode

*COILTRONICS #100-1-52

PULSE ENGINEERING, INC. #PE-92102

HURRICANE #HL-AG210LL

THESE ARE LOW COST POWDERED IRON CORES. OPTIMUM EFFICIENCY

AND SMALLEST SIZE IS OBTAINED BY USING A LOW LOSS CORE SUCH

AS MAGNETICS INC. KOOL M . SEE EFFICIENCY GRAPH.

Basic 5V Positive Buck Converter

100 F

PPLICATI

GND

LT1176-5

SENSE

2.7k

0.01 F

1N5819

100 H

L1*

LT1176/76-5 • TA01

470 F

25V

5V, 0.8A

tion. The power switch, all oscillator and control circuitry,

and all current limit components are included on the chip.

The topology is a classic positive “buck” configuration but

several design innovations allows this device to be used as

a positive-to-negative converter, a negative boost con-

verter, and as a flyback converter. The switch output is

specified to swing below ground.

The LT1176 uses a true analog multiplier in the feedback

loop. This makes the device respond nearly instantaneously

to input voltage fluctuations and makes loop gain indepen-

dent of input voltage. As a result, dynamic behavior of the

regulator is significantly improved over previous designs.

On-chip pulse by pulse current limiting makes the LT1176

nearly bust-proof for output overloads or shorts. The input

voltage range as a buck converter is 8V to 35V, but a self-

boot feature allows input voltages as low as 5V in the

inverting and boost configurations.

The LT1176 is available in a low cost 8-lead DIP package

with frequency preset at 100kHz and current limit at 1.7A An

adjustable output is offered as well as a preset 5V version.

For further design details and application help, see the

LT1074/LT1076 data sheet and Application Note 44.

L = 100 H ON MAGNETICS INC.

SIZE T-50 KOOL M CORE

0.1

5V Buck Converter Efficiency

= 10V

0.2

Switching Regulator

0.3

LOAD CURRENT (A)

0.4

= 20V

LT1176/LT1176-5

0.5

0.6

0.7

LT1176/76-5 • TA02

0.8

Step-Down

0.9

1.0

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lt1176csw-pbf Summary of contents

Page 1

FEATURE S 1.2A On-Board Switch 100kHz Switching Frequency Excellent Dynamic Behavior DIP and Surface Mount Packages Only 8mA Quiescent Current Preset 5V Output Available Operates Up to 35V Input Micropower Shutdown Mode PPLICATI S Buck Converter with ...

Page 2

LT1176/LT1176 BSOLUTE Input Voltage .......................................................... 38V Switch Voltage With Respect to Input Voltage ........ 50V Switch Voltage With Respect to Ground Pin (V Negative) (Note 6) ......................................... 20V SW Feedback Pin Voltage....................................... – ...

Page 3

... 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. T ...

Page 4

... SEE NOTE LT/GP 0393 10K REV 0 LINEAR TECHNOLOGY CORPORATION 1993 0.394 – 0.419 (10.007 – 10.643) ...

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