Datasheet > LT3957

LT3957

更新时间： 2024-09-29 05:43:35

品牌	Logo	应用领域
凌特 - Linear		转换器开关
页数	文件大小	规格书
28页	359K
描述
Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

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中文翻译

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LT3957 数据手册

LT3957

Boost, Flyback, SEPIC and

Inverting Converter

with 5A, 40V Switch

FEATURES

DESCRIPTION

The LT^®3957 is a wide input range, current mode DC/DC

converter which is capable of generating either positive

or negative output voltages. It can be conﬁgured as either

a boost, ﬂyback, SEPIC or inverting converter. It features

an internal low side N-channel power MOSFET rated for

40V at 5A and driven from an internal regulated 5.2V

supply. The ﬁxed frequency, current-mode architecture

results in stable operation over a wide range of supply

and output voltages.

Wide Input Voltage Range: 3V to 40V

Single Feedback Pin for Positive or Negative

Output Voltage

Internal 5A/40V Power Switch

Current Mode Control Provides Excellent Transient

Response

Programmable Operating Frequency (100kHz to

1MHz) with One External Resistor

Synchronizable to an External Clock

Low Shutdown Current < 1μA

The operating frequency of LT3957 can be set with an

external resistor over a 100kHz to 1MHz range, and can

be synchronized to an external clock using the SYNC pin.

A minimum operating supply voltage of 3V, and a low

shutdown quiescent current of less than 1μA, make the

LT3957 ideally suited for battery-powered systems.

Internal 5.2V Low Dropout Voltage Regulator

Programmable Input Undervoltage Lockout with

Hysteresis

Programmable Soft-Start

Thermally Enhanced QFN (5mm × 6mm) Package

The LT3957 features soft-start and frequency foldback

functions to limit inductor current during start-up.

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

APPLICATIONS

Automotive

No R

and ThinSOT are trademarks of Linear Technology Corporation.

SENSE

Telecom

All other trademarks are the property of their respective owners. Patents pending.

Industrial

TYPICAL APPLICATION

High Efﬁciency Output Boost Converter

Efﬁciency vs Output Current

10μH

OUT

100

= 12V

24V

4.5V TO 16V

600mA

10μF

200k

EN/UVLO

GND

95.3k

LT3957

SGND

SYNC

SENSE1

226k

SENSE2

FBX

INTV

RT SS

6.8k

22nF

15.8k

41.2k

300kHz

4.7μF

0.33μF

400

OUTPUT CURRENT (mA)

500

600

100

200

300

3957 TA01b

3957 TA01a

3957f

12 3 4 5 6 7...28

中文翻译

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与LT3957相关器件

型号	品牌	获取价格	描述	数据表
LT3957A	Linear	获取价格	Boost, Flyback, SEPIC and Inverting Converter
LT3957A	ADI	获取价格	具 5A、40V 开关的升压、反激式、SEPIC 和负输出转换器
LT3957AEUHE#PBF	Linear	获取价格	LT3957A - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957AEUHE#TRPBF	Linear	获取价格	LT3957A - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957AIUHE#PBF	Linear	获取价格	LT3957A - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957AIUHE#TRPBF	Linear	获取价格	LT3957A - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957EUHE#PBF	Linear	获取价格	LT3957 - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957EUHE#TRPBF	Linear	获取价格	LT3957 - Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch; Package: QFN;
LT3957EUHEPBF	Linear	获取价格	Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch
LT3957EUHETRPBF	Linear	获取价格	Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

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