LT1176CSW5PBF Linear Technology Corporation, LT1176CSW5PBF Datasheet

LT1176CSW5PBF

Manufacturer Part Number

LT1176CSW5PBF

Description

SOP20

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1176CSWPBF.pdf (4 pages)

Specifications of LT1176CSW5PBF

Date_code

10+

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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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