Datasheet > 508581F

508581F

更新时间： 2024-11-27 23:21:39

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508581F 数据手册

LT1074/LT1076

Step-Down Switching

Regulator

tions allow this device to be used as a positive-to-negative

converter, a negative boost converter, and as a flyback

converter. The switch output is specified to swing 40V

below ground, allowing the LT1074 to drive a tapped-

inductor in the buck mode with output currents up to 10A.

EATURE

■

5A On-Board Switch (LT1074)

100kHz Switching Frequency

Greatly Improved Dynamic Behavior

Available in Low Cost 5 and 7-Lead Packages

Only 8.5mA Quiescent Current

Programmable Current Limit

Operates Up to 60V Input

The LT1074 uses a true analog multiplier in the feedback

loop. This makes the device respond nearly instanta-

neously to input voltage fluctuations and makes loop gain

independent of input voltage. As a result, dynamic behav-

ior of the regulator is significantly improved over previous

designs.

Micropower Shutdown Mode

O U

PPLICATI

■

Buck Converter with Output Voltage Range of 2.5V

to 50V

On-chip pulse by pulse current limiting makes the LT1074

nearlybust-proofforoutputoverloadsorshorts.Theinput

voltage range as a buck converter is 8V to 60V, but a self-

boot feature allows input voltages as low as 5V in the

inverting and boost configurations.

■

Tapped-Inductor Buck Converter with 10A Output

at 5V

■

Positive-to-Negative Converter

Negative Boost Converter

Multiple Output Buck Converter

The LT1074 is available in low cost TO-220 or TO-3

packages with frequency pre-set at 100kHz and current

limit at 6.5A (LT1076 = 2.6A). A 7-pin TO-220 package is

also available which allows current limit to be adjusted

down to zero. In addition, full micropower shutdown can

be programmed. See Application Note 44 for design

details.

DESCRIPTIO

The LT1074 is a 5A (LT1076 is rated at 2A) monolithic

bipolar switching regulator which requires only a few

external parts for normal operation. The power switch, all

oscillator and control circuitry, and all current limit com-

ponents,areincludedonthechip.Thetopologyisaclassic

positive “buck” configuration but several design innova-

A fixed 5V output, 2A version is also available. See LT1076-5.

TYPICAL APPLICATI

Buck Converter Efficiency

Basic Positive Buck Converter

LT1074

L1**

100

50 H (LT1074)

100µH (LT1076)

= 12V, V = 20V

OUT

*USE MBR340 FOR LT1076

**COILTRONICS #50-2-52 (LT1074)

#100-1-52 (LT1076)

PULSE ENGINEERING, INC.

#PE-92114 (LT1074)

#PE-92102 (LT1076)

HURRICANE #HL-AK147QQ (LT1074)

10V TO 40V

2.8k

MBR745*

LT1074

= 5V, V = 15V

OUT

GND

2.21k

#HL-AG210LL (LT1076)

2.7k

†

L = 50µH TYPE 52 CORE

RIPPLE CURRENT RATING

≥

/ 2

OUT

†

DIODE = MBR735

200

0.01

500

25V

µF

OUTPUT LOAD CURRENT (A)

LT1074 • TA01

LT1074 • TPC27

12 3 4 5 6 7...16

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