Datasheet > LT1938

LT1938

更新时间： 2024-10-04 14:57:51

品牌	Logo	应用领域
亚德诺 - ADI		开关稳压器
页数	文件大小	规格书
24页	264K
描述
25V、2.2A、2.8MHz 降压型开关稳压器

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中文翻译

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LT1938 数据手册

LT1938

25V, 2.2A, 2.8MHz

Step-Down

Switching Regulator

FEATURES

DESCRIPTION

The LT^®1938 is an adjustable frequency (300kHz to

2.8MHz)monolithicbuckswitchingregulatorthataccepts

input voltages up to 25V. A high efﬁciency 0.18Ω switch

is included on the die along with a boost Schottky diode

and the necessary oscillator, control and logic circuitry.

Current mode topology is used for fast transient response

and good loop stability. The LT1938’s high operating fre-

quency allows the use of small, low cost inductors and

ceramic capacitors resulting in low output ripple while

keeping total solution size to a minimum. The low current

shutdown mode reduces input supply current to less than

1µA while a resistor and capacitor on the RUN/SS pin

provide a controlled output voltage ramp (soft-start). A

■

Wide Input Voltage Range: 3.6V to 25V

■

2.2A Maximum Output Current

■

Adjustable Switching Frequency: 300kHz to 2.8MHz

Low Shutdown Current: I < 1µA

Integrated Boost Diode

Power Good Flag

Saturating Switch Design: 0.18Ω On-Resistance

1.265V Feedback Reference Voltage

Output Voltage: 1.265V to 20V

Soft-Start Capability

Small 10-Pin Thermally Enhanced (3mm × 3mm)

DFN Package

■

APPLICATIONS

power good ﬂag signals when V

reaches 90% of the

OUT

programmed output voltage. The LT1938 is available in

a 3mm × 3mm DFN package with Exposed Pad for low

thermal resistance.

■

Automotive Battery Regulation

■

Power for Portable Products

■

Distributed Supply Regulation

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

All other trademarks are the property of their respective owners.

■

Industrial Supplies

■

Wall Transformer Regulation

TYPICAL APPLICATION

3.3V Step-Down Converter

Efﬁciency (V_OUT= 3.3V)

3.3V

2.2A

OUT

4.5V TO

25V

= 7V

RUN/SS

BOOST

OFF ON

16.2k

= 24V

0.47µF

4.7µH

= 12V

4.7µF

LT1938

680pF

BIAS

324k

60.4k

GND

200k

22µF

L: NEC PLC-0745-4R7

f = 800kHz

1938 TA01

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2

LOAD CURRENT (A)

1938 G02

1938fa

12 3 4 5 6 7...24

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与LT1938相关器件

型号	品牌	获取价格	描述	数据表
LT1938IDD#TRPBF	Linear	获取价格	LT1938 - 25V, 2.2A, 2.8MHz Step-Down Switching Regulator; Package: DFN; Pins: 10; Temperat
LT1939	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
LT1939	ADI	获取价格	单片式 2A 降压型稳压器和线性稳压器/控制器
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;

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