LT1172MJ8 Linear Technology, LT1172MJ8 Datasheet

LT1172MJ8

Manufacturer Part Number

LT1172MJ8

Description

SP-SWREG/Monolithic, 100kHz 5A 2.5A And 1.25A High Efficiency Switching Regulato

Manufacturer

Linear Technology

Datasheets

1.LT1172MJ8.pdf (20 pages)

2.LT1172MJ8.pdf (20 pages)

3.LT1172MJ8.pdf (20 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

USER NOTE:

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

of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the

LT1170/LT1171/LT1172. A complete design manual (AN19) 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 LT1170/LT1171/LT1172 by factoring in the higher

frequency. A CAD design program called SwitcherCAD

Wide Input Voltage Range: 3V to 60V

Low Quiescent Current: 6mA

Internal 5A Switch (2.5A for LT1171,

1.25A for LT1172)

Shutdown Mode Draws Only 50 A Supply Current

Very Few External Parts Required

Self-Protected Against Overloads

Operates in Nearly All Switching Topologies

Flyback-Regulated Mode Has Fully Floating Outputs

Comes in Standard 5-Pin Packages

LT1172 Available in 8-Pin MiniDIP and Surface Mount

Packages

Can Be Externally Synchronized

Logic Supply 5V at 10A

5V Logic to 15V Op Amp Supply

Battery Upconverter

Power Inverter (+ to –) or (– to +)

Fully Floating Multiple Outputs

*REQUIRED IF INPUT LEADS 2"

C3*

100 F

GND

Boost Converter (5V to 12V)

LT1170

50 H

L1**

1 F

** COILTRONICS 50-2-52

PULSE ENGINEERING 92114

MBR330

is also available.

100 F

10 H

1000 F

OUTPUT

High Efficiency Switching Regulators

FILTER

10.7k

1.24k

1170/1/2 TA01

12V

DESCRIPTIO

The LT

switching regulators. They can be operated in all standard

switching configurations including buck, boost, flyback,

forward, inverting and “Cuk.” A high current, high effi-

ciency switch is included on the die along with all oscilla-

tor, control and protection circuitry. Integration of all

functions allows the LT1170/LT1171/LT1172 to be built in

a standard 5-pin TO-3 or TO-220 power package as well as

the 8-pin packages (LT1172). This makes them extremely

easy to use and provides “bust proof” operation similar to

that obtained with 3-pin linear regulators.

The LT1170/LT1171/LT1172 operate with supply volt-

ages from 3V to 60V, and draw only 6mA quiescent

current. They can deliver load power up to 100W with no

external power devices. By utilizing current-mode switch-

ing techniques, they provide excellent AC and DC load and

line regulation.

The LT1170/LT1171/LT1172 have many unique features

not found even on the vastly more difficult to use low

power control chips presently available. They use adaptive

antisat switch drive to allow very wide ranging load cur-

rents with no loss in efficiency. An externally activated

shutdown mode reduces total supply current to 50 A

typically for standby operation.

SwitcherCAD is a trademark of Linear Technology Corporation.

100kHz, 5A, 2.5A and 1.25A

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

100

1170/LT1171/LT1172 are monolithic high power

LT1170

Maximum Output Power*

BOOST

INPUT VOLTAGE (V)

LT1 170/LT1 171/LT1172

BUCK-BOOST

FLYBACK

= 5V

BUCK-BOOST

= 30V

** DIVIDE VERTICAL POWER SCALE

* ROUGH GUIDE ONLY. BUCK MODE

SPECIAL TOPOLOGIES DELIVER

MORE POWER.

FOR LT1172.

BY TWO FOR LT1171, BY FOUR

OUT

= (5A)(V

OUT

)

LT1170/1/2 TA02

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