LT1072CK datasheet, PDF - EEWORLD Datasheet

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LT1072CK: Description开关稳压器 IC 输出 TO-3-4; Categorysemiconductor Power management; File Size194KB，16 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT1072CK Overview

开关稳压器 IC 输出 TO-3-4

LT1072CK Parametric

Parameter Name	Attribute value
category
Maker	ADI
series	*
Installation type	Through hole
Package/casing	TO-3-4
Supplier device packaging	TO-3
Basic product number	LT1072

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LT1072

1.25A High Efficiency

Switching Regulator

FEATURES

■

DESCRIPTIO

Available in MiniDiP, TO-220, and TO-3 Packages

Wide Input Voltage Range 3V to 60V

Low Quiescent Current—6mA

Internal 1.25A Switch

Very Few External Parts Required

Self-Protected Against Overloads

Operates in Nearly All Switching Topologies

Shutdown Mode Draws Only 50µA Supply Current

Flyback-Regulated Mode has Fully Floating Outputs

Can be Externally Synchronized

The LT

1072 is a monolithic high power switching

regulator. It can be operated in all standard switching

configurations including buck, boost, flyback, forward,

inverting and “Cuk”. A high current, high efficiency switch

is included on the die along with all oscillator, control, and

protection circuitry. Integration of all functions allows the

LT1072 to be built in a standard 5-pin TO-3 or TO-220

power package as well as the 8-pin miniDlP. This makes it

extremely easy to use and provides “bust proof” operation

similar to that obtained with 3-pin linear regulators.

The LT1072 operates with supply voltages from 3V to 60V,

and draws only 6mA quiescent current. It can deliver load

power up to 20 watts with no external power devices. By

utilizing current-mode switching techniques, it provides

excellent AC and DC load and line regulation.

The LT1072 has many unique features not found even on

the vastly more difficult to use low power control chips

presently available. It uses an adaptive anti-sat switch

drive to allow very wide ranging load currents with no loss

in efficiency. An externally activated shutdown mode

reduces total supply current to 50µA typical for standby

operation. Totally isolated and regulated outputs can be

generated by using the optional “flyback regulation mode”

built into the LT1072, without the need for optocouplers or

extra transformer windings.

APPLICATIO S

■

Logic Supply 5V at 2.5A

5V Logic to

±15V

Op Amp Supply

Offline Converter up to 50W

Battery Upconverter

Power lnverter (+ to –) or (– to +)

Fully Floating Multiple Outputs

Driver for High Current Supplies

USER NOTE:

This data sheet is only intended to provide specifications, graphs, and a general functional

description of the LT1072. Application circuits are included to show the capability of the LT1072.

A complete design manual (AN-19) should be obtained to assist in developing new designs. This

manual contains a comprehensive discussion of both the LT1070 and the external components used

with it, as well as complete formulas for calculating the values of these components. The manual

can also be used for the LT1072 by factoring in the lower switch current rating.

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

TYPICAL APPLICATIO

220µH**

Boost Converter (5V to 12V)

Maximum Output Power*

POWER (W)

BUCK-BOOST

= 30V

BOOST

FLYBACK

ISOLATED

25µF*

–

LT1072

10.7k

GND

12V, 0.25A

1µF

–

*REQUIRED IF INPUT LEADS

≥

2”

**PULSE ENGINEERING 52626

1.24k

470µF

–

BUCK-BOOST

= 5V

INPUT VOLTAGE (V)

LT1072 • TA01

*ROUGH GUIDE ONLY. BUCK MODE P

OUT

= 1A x V

OUT

MINIDIP OUTPUT POWER MAY BE LIMITED BY PACKAGE TEMPERATURE

RISE AT HIGH INPUT VOLTAGES OR HIGH DUTY CYCLES

LT1072 • TA02

1072fc

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