Datasheet > LT1932

LT1932

更新时间： 2024-11-30 14:57:43

品牌	Logo	应用领域
亚德诺 - ADI		驱动驱动器
页数	文件大小	规格书
16页	246K
描述
采用 ThinSOT 封装的恒定电流 DC/DC LED 驱动器

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中文翻译

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LT1932 数据手册

LT1932

Constant-Current DC/DC

LED Driver in ThinSOT

FEATURES

DESCRIPTIO

■

Up to 80% Efficiency

TheLT^®1932isafixedfrequencystep-upDC/DCconverter

designed to operate as a constant-current source. Be-

cause it directly regulates output current, the LT1932 is

ideal for driving light emitting diodes (LEDs) whose light

intensity is proportional to the current passing through

them, not the voltage across their terminals.

■

Inherently Matched LED Current

■

Adjustable Control of LED Current

■

Drives Five White LEDs from 2V

■

Drives Six White LEDs from 2.7V

■

Drives Eight White LEDs from 3V

■

Disconnects LEDs In Shutdown

With an input voltage range of 1V to 10V, the device works

from a variety of input sources. The LT1932 accurately

regulates LED current even when the input voltage is

higher than the LED voltage, greatly simplifying battery-

powered designs. A single external resistor sets LED

current between 5mA and 40mA, which can then be easily

adjusted using either a DC voltage or a pulse width

modulated (PWM) signal. When the LT1932 is placed in

shutdown, the LEDs are disconnected from the output,

ensuring a quiescent current of under 1µA for the entire

circuit. The device’s 1.2MHz switching frequency permits

theuseoftiny, lowprofilechipinductorsandcapacitorsto

minimize footprint and cost in space-conscious portable

applications.

■

1.2MHz Fixed Frequency Switching

■

Uses Tiny Ceramic Capacitors

Uses Tiny 1mm-Tall Inductors

■

Regulates Current Even When V_IN> V_OUT

■

Operates with V_INas Low as 1V

Low Profile (1mm) ThinSOT^TMPackage

■

APPLICATIO S

■

Cellular Telephones

■

Handheld Computers

■

Digital Cameras

■

Portable MP3 Players

■

Pagers

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

ThinSOT is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

Li-Ion Driver for Four White LEDs

Efficiency

6.8µH

= 4.2V

= 2.7V

2.7V TO 4.2V

4.7µF

LT1932

SHDN

PWM

DIMMING

CONTROL

1µF

LED

GND

SET

15mA

SET

1.50k

LED CURRENT (mA)

C1: TAIYO YUDEN JMK212BJ475

C2: TAIYO YUDEN EMK212BJ105

D1:ZETEX ZHCS400

1932 TA01

1932 TA02

L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8

1932f

12 3 4 5 6 7...16

中文翻译

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与LT1932相关器件

型号	品牌	获取价格	描述	数据表
LT1932ES6	Linear	获取价格	Constant-Current DC/DC LED Driver in ThinSOT
LT1932ES6#PBF	Linear	获取价格	LT1932 - Constant-Current DC/DC LED Driver in ThinSOT; Package: SOT; Pins: 6; Temperature
LT1932ES6#TR	Linear	获取价格	IC 0.78 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6, PLASTIC, SOT-23, 6 PIN,
LT1932ES6#TRM	Linear	获取价格	IC 0.78 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6, PLASTIC, SOT-23, 6 PIN,
LT1932ES6#TRMPBF	Linear	获取价格	LT1932 - Constant-Current DC/DC LED Driver in ThinSOT; Package: SOT; Pins: 6; Temperature
LT1933	Linear	获取价格	600mA, 500kHz Step-Down Switching Regulator in SOT-23
LT1933	ADI	获取价格	采用 SOT-23 和 DFN 封装的 600mA、500kHz 降压型开关稳压器
LT1933_1	Linear	获取价格	600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages
LT1933ES6	Linear	获取价格	600mA, 500kHz Step-Down Switching Regulator in SOT-23
LT1933ES6#TRM	Linear	获取价格	LT1933 - 600mA, 500kHz Step-Down Switching Regulator in SOT-23; Package: SOT; Pins: 6; Tem

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