Datasheet > LT1939

LT1939

更新时间： 2024-10-04 14:57:23

品牌	Logo	应用领域
亚德诺 - ADI		控制器稳压器
页数	文件大小	规格书
24页	349K
描述
单片式 2A 降压型稳压器和线性稳压器/控制器

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中文翻译

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LT1939 数据手册

LT1939

Monolithic 2A Step-Down

Regulator Plus Linear

Regulator/Controller

FEATURES

DESCRIPTION

The LT^®1939 is a current mode PWM step-down DC/DC

converter with an internal 2.3A switch. The wide input

range of 3V to 25V makes the LT1939 suitable for regu-

lating power from a wide variety of sources, including

automotive batteries, industrial supplies and unregulated

wall adapters.

Wide Input Range: 3V to 25V

Short-Circuit Protected Over Full Input Range

2A Output Current Capability

Adjustable/Synchronizable Fixed Frequency

Operation from 250kHz to 2.2MHz

Soft-Start/Tracking Capability

Output Adjustable Down to 0.8V

Resistor-programmable 250kHz to 2.2MHz frequency

range and synchronization capability enable optimization

between efﬁciency and external component size. Cycle-

by-cycle current limit, frequency foldback and thermal

shutdown provide protection against a shorted output.

The soft-start feature controls the ramp rate of the output

voltage, eliminating input current surge during start-up,

and also provides output tracking.

Adjustable Linear Regulator/Driver with 13mA

Output Capability

Power Good Comparator with Complementary

Outputs

Low Shutdown Current: 12μA

Thermally Enhanced 3mm × 3mm DFN Package

APPLICATIONS

The LT1939 contains an internal NPN transistor with feed-

back control which can be conﬁgured as a linear regulator

or as a linear regulator controller.

Automotive Battery Regulation

Industrial Control

Wall Transformer Regulation

Distributed Power Regulation

TheLT1939’slowcurrentshutdownmode(<12μA)enables

easy power management in battery-powered systems.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

Dual Step-Down Converters

Switching Converter Efﬁciency

Output Voltage Ripple

BAT54

6V TO 25V

2.2μF

BST

0.47μF

6.8μH

LT1939

OUT1

= 5V AT 1A

AC COUPLED

2mV/DIV

B240A

SHDN

42.2k

22μF

0.47μF

8.06k

= 3.3V AT 1A

AC COUPLED

2mV/DIV

OUT2

SYNC LDRV

OUT2

= 12V

= 0A

53.6k

330pF

FREQUENCY = 800kHz

24.9k

8.06k

OUT2

3.3V

1939 TA01c

LFB

500ns/DIV

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

40.2k

22μF

LOAD CURRENT (A)

1939 TA01b

1939 TA01a

1939f

12 3 4 5 6 7...24

中文翻译

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与LT1939相关器件

型号	品牌	获取价格	描述	数据表
LT1939_15	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939EDD	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939EDD#PBF	Linear	获取价格	LT1939 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller; Package: DFN;
LT1939EDD#TRPBF	Linear	获取价格	LT1939 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller; Package: DFN;
LT1939EDD-PBF	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939EDD-TRPBF	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939IDD#PBF	Linear	获取价格	LT1939 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller; Package: DFN;
LT1939IDD#TRPBF	Linear	获取价格	LT1939 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller; Package: DFN;
LT1939IDD-PBF	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939IDD-TRPBF	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

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