LT1172CS8PBF Linear Technology Corporation, LT1172CS8PBF Datasheet

LT1172CS8PBF

Manufacturer Part Number

LT1172CS8PBF

Description

SOP8

Manufacturer

Linear Technology Corporation

Datasheets

1.LT1170HVCTPBF.pdf (24 pages)

2.LT1172CS8PBF.pdf (20 pages)

Specifications of LT1172CS8PBF

Date_code

08+

Current page: 1 of 24
Download datasheet (231Kb)

FEATURES

APPLICATIONS

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

TYPICAL APPLICATION

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 50μA 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*

100μF

GND

Boost Converter (5V to 12V)

LT1170

50 μ H

L1**

1μF

** COILTRONICS 50-2-52

PULSE ENGINEERING 92114

MBR330

100μF

is also available.

10μH

1000μF

High Efficiency Switching Regulators

OUTPUT

FILTER

10.7k

1170/1/2 TA01

1.24k

12V

100kHz, 5A, 2.5A and 1.25A

DESCRIPTION

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 efficiency

switch is included on the die along with all oscillator, con-

trol 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 voltages

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

They can deliver load power up to 100W with no exter-

nal power devices. By utilizing current-mode switching

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 currents with

no loss in efficiency. An externally activated shutdown

mode reduces total supply current to 50μA typically for

standby operation.

L, LT, LTC, LTM, Linear Technology, the Linear logo and SwitcherCAD are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

100

LT1170

1170/LT1171/LT1172 are monolithic high power-

Maximum Output Power*

BOOST

LT1170/LT1171/LT1172

INPUT VOLTAGE (V)

BUCK-BOOST

FLYBACK

= 5V

BUCK-BOOST

= 30V

** DIVIDE VERTICAL POWER SCALE

* ROUGH GUIDE ONLY. BUCK MODE

SPECIAL TOPOLOGIES DELIVER

MORE POWER.

BY TWO FOR LT1171, BY FOUR

FOR LT1172.

OUT

= (5A)(V

OUT

)

LT1170/1/2 TA02

117012fg

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