LT1270CT#PBF Linear Technology, LT1270CT#PBF Datasheet

LT1270CT#PBF

Manufacturer Part Number

LT1270CT#PBF

Description

IC SW-REG 8A HI-EFF TO220-5

Manufacturer

Linear Technology

Type

Step-Down (Buck), Step-Up (Boost), Inverting, Flybackr

Datasheet

1.LT1270CTPBF.pdf (4 pages)

Specifications of LT1270CT#PBF

Synchronous Rectifier

Number Of Outputs

Current - Output

Frequency - Switching

60kHz

Voltage - Input

3.5 ~ 30 V

Operating Temperature

0°C ~ 125°C

Mounting Type

Through Hole

Package / Case

TO-220-5 (Bent and Staggered Leads)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Power - Output

Internal Switch(s)

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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 LT1270A/LT1270. Application circuits are included to show the capability of the

LT1270A/LT1270. A complete design manual (AN-19) should be obtained to assist in developing

new designs. AN-19 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. AN-19 can also be used for the LT1270A/LT1270 by factoring in the higher switch

current rating and higher operating frequency.

A comprehensive CAD program called SwitcherCad is also available. Contact the local sales office

in your area or the factory direct.

(8V TO 25V)

Wide Input Voltage Range: 3.5V to 30V

Low Quiescent Current: 7mA

Internal 8A Switch (10A for LT1270A)

Very Few External Parts Required

Self-Protected Against Overloads

Shutdown Mode Draws Only 100 A Supply Current

Flyback-Regulated Mode Has Fully Floating Outputs

Can be Externally Synchronized

(See LT1072 Data Sheet)

Comes in Standard 5-Pin TO-220 Package

High Efficiency Buck Converter

PC Power Supply with Multiple Outputs

Battery Upconverter

Negative-to-Positive Converter

470 F

35V

1N5819

1 F

GND

LT1270*

High Efficiency

MBR1035*

0.047 F

2N3904

360

†

Buck Converter

35 H, 8A*

0.047 F

†

*THESE COMPONENTS RATED CONSERVATIVELY TO

EFFICIENCY IS

FOR POWER SHUTDOWN OPTION, CONSULT FACTORY.

IMPROVE EFFICIENCY. MAXIMUM OUTPUT CURRENT

CAN BE 7A. FOR HIGH EFFICIENCY, THE INDUCTOR SHOULD

BE MOLYPERMALLOY OR FERRITE.

LT1431CZ

CATHODE

ANODE

560

1N4158

88% @ 2A, 86% @ 5A.

REF

9.1k

10k

DESCRIPTIO

The LT1270A/LT1270 are monolithic high power switch-

ing regulators. Identical to the popular LT1070, except for

switching frequency (60kHz) and higher switch current,

they can be operated in all standard switching configura-

tions including buck, boost, flyback, and inverting. A high

current, high efficiency switch is included on the die along

with all oscillator, control, and protection circuitry. Inte-

gration of all functions allows the LT1270A/LT1270 to be

built in a standard TO-220 power package. This makes it

extremely easy to use and provides “bust proof” operation

similar to that obtained with 3-pin linear regulators.

The LT1270A/LT1270 operate with supply voltages from

3.5V to 30V, and draw only 7mA quiescent current. By

utilizing current-mode switching techniques, they provide

excellent AC and DC load and line regulation.

The LT1270A/LT1270 use adaptive anti-sat switch drive to

allow very wide ranging load currents with no loss in

efficiency. An externally activated shutdown mode re-

duces total supply current to 100 A typical for standby

operation.

1000 F

25V

5V*

LT1270 • TA01

8A and 10A High Efficiency

Switching Regulators

100

*MULTIPLY BY 1.2 FOR LT1270A.

†

BUCK MODE OUTPUT POWER

OPTIMUM TO ACHIEVE FULL POWER

TRANSFORMER TURNS RATIO MUST BE

LT1270A/LT1270

Maximum Output Power*

INPUT VOLTAGE (V)

BOOST

FLYBACK

BUCK-BOOST,

BUCK-BOOST, V

(INVERTING)

†

= 12V

(7.5A)(V

LT1270 • TA02

= 5V

OUT

1270afc

)

Related parts for LT1270CT#PBF

LT1270CT#PBF Summary of contents

Page 1

FEATURES Wide Input Voltage Range: 3.5V to 30V Low Quiescent Current: 7mA Internal 8A Switch (10A for LT1270A) Very Few External Parts Required Self-Protected Against Overloads Shutdown Mode Draws Only 100 A Supply Current Flyback-Regulated Mode Has Fully Floating Outputs ...

Page 2

LT1270A/LT1270 BSOLUTE (Note 1) Supply Voltage ....................................................... 30V Switch Output Voltage ............................................ 60V Feedback Pin Voltage (Transient, 1ms) ................ 15V Operating Junction Temperature Range LT1270AC/LT1270C (Oper.) ................ 125 C LT1270AC/LT1270C ...

Page 3

... DUTY CYCLE (%) TYPICAL APPLICATIO S 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 representation that the interconnection of circuits as described herein will not infringe on existing patent rights. The denotes specifications which apply over the full operating tempera ...

Page 4

... MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 (min) = 2.21V 8.5mA, I OUT Q SD (min) = 0.8V <1 A, OUT Q SD (min) = 1.2V 2.5mA OUT Q SD LT/TP 1203 1K REV C • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1992 LOAD –5.2V, 7.5A 12k + C4 200 1270afc ...

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