Datasheet > GM1937ST25RG

GM1937ST25RG

更新时间： 2022-12-20 00:34:14

品牌	Logo	应用领域
GAMMA		转换器升压转换器
页数	文件大小	规格书
9页	129K
描述
WHITE LED STEP-UP CONVERTER

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GM1937ST25RG 数据手册

GM1937

WHITE LED STEP-UP CONVERTER

Description

Features

The GM1937 is a step-up DC/DC converter specifically

designed to drive white LEDs with a constant current.

High Efficiency: 84% Typical

36V internal Switch

Fast 1.2MHz Switching Frequency

Drives Up to threeLEDs from a 2.8V

Supply

Drives Up to six LEDs from a 5V

Supply

External Matched LED Current

Uses Tiny 1mm height inductor

The device can drive two, three or four LEDs in series

from a Li-Ion cell. Series connection of the LEDs

provides identical LED currents resulting in uniform

brightness and eliminating the need for ballast

resistors.

The output capacitor can be as small as 0.22µF,

saving space versus alternative solutions. A low 95mV

feedback voltage minimizes power loss for better

ꢀ

Output

Requires Only 0.22

Capacitor

Low profile TSOT package

Application

Cellular Phones

MPS3 Players

GPS Receivers

PDA, Handheld Computers

Digital Cameras

Typical Application Circuits

22µH

V_IN

3V to 5V

0.22µF

1µF

V_IN

V_IN= 3.0V

GM1937

V_IN= 3.6V

OFF ON

GND

6.34Ω

Figure 1

Li-Ion Powered Driver for Three White LEDs

LED CURRENT (mA)

12 3 4 5 6 7...9

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