Datasheet > CAT37_08

CAT37_08

更新时间： 2024-11-25 04:35:43

品牌	Logo	应用领域
德州仪器 - TI		驱动器转换器升压转换器
页数	文件大小	规格书
13页	242K
描述
CMOS White LED Driver Boost Converter

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中文翻译

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CAT37_08 数据手册

CAT37

CMOS White LED Driver Boost Converter

FEATURES

DESCRIPTION

Low quiescent ground current (0.5mA typical)

Power efficiency over 80%

The CAT37 is a DC/DC step up converter that delivers

a regulated output current. Operation at a constant

switching frequency of 1.2MHz allows the device to be

used with very small value external inductor and

ceramic capacitors.

Compatible pinout with LT1932

Adjustable output current (up to 40mA)

High frequency 1.2MHz operation

Input voltage operation down to 2.5V

Low resistance (0.5Ω) power switch

Drives up to 4 White LEDs in series

Shutdown current less than 1µA

The CAT37 is targeted to drive multiple white light-

emitting diodes (LEDs) connected in series and

provides the necessary regulated current to control

the brightness and the color purity. An external

resistor R1 controls the output current level. LED

currents of up to 40mA can be supported over a wide

range of input supply voltages from 2.5V to 7V,

making the device ideal for battery-powered

applications.

Load fault protection against open-circuits

Low value external components

Low profile (1mm) TSOT-23 5-lead package

A high voltage output stage allows up to 4 White LEDs

to be driven in series. Series drive provides inherent

current matching.

APPLICATION

Color LCD and keypad backlighting

Cellular phones

LED dimming can be done by using a DC voltage, a

logic signal, or a pulse width modulation (PWM)

signal. The shutdown input pin allows the device to be

placed in power-down mode with “near zero”

quiescent current.

Handheld terminals

Digital cameras

PDAs/Games

In addition to overcurrent limiting protection, the

device also includes detection circuitry to ensure

protection against open-circuit load fault conditions.

Portable MP3 players

For Ordering Information details, see page 11.

The device is available in a low profile (1mm max

height) 5-lead TSOT-23 package.

TYPICAL APPLICATION CIRCUIT

6.8µH

VIN

3V to 5V

1µF

VIN

CAT37

15mA

ON OFF

SHDN

C1: Taiyo Yuden JMK212BJ475

C2: Taiyo Yuden EMK212BJ105

D1: Zetez ZHCS400

L1: Panasonic ELJEA6R8 or equivalent

GND

6.34kΩ

Figure 1. Driver for Four High-Brightness White LEDs

Characteristics subject to change without notice

Doc. No. MD-5005 Rev. T

12 3 4 5 6 7...13

中文翻译

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与CAT37_08相关器件

型号	品牌	获取价格	描述	数据表
CAT-3-75	MINI	获取价格	Fixed Attenuator, 0MHz Min, 500MHz Max, CASE FF55
CAT37EKK	ONSEMI	获取价格	LED DISPLAY DRIVER, PDSO5, SOT-23, 5 PIN
CAT37EKK-TE7	CATALYST	获取价格	CMOS White LED Driver Boost Converter
CAT37EKK-TE7	ONSEMI	获取价格	LED DISPLAY DRIVER, PDSO5, 1 MM HEIGHT, SOT-23, 5 PIN
CAT37RD2-TE13	CATALYST	获取价格	LED Driver, 1-Segment, CMOS, PDSO8, 3 X 4.90 MM, MSOP-8
CAT37RD4-TE13	CATALYST	获取价格	CMOS White LED Driver Boost Converter
CAT37RD4-TE13	ONSEMI	获取价格	IC LED DISPLAY DRIVER, PDSO8, 3 X 3 MM, 0.80 MM HEIGHT, MSOP-8, Display Driver
CAT37TDI	CATALYST	获取价格	CMOS White LED Driver Boost Converter
CAT37TDI	ONSEMI	获取价格	LED DISPLAY DRIVER, PDSO5, 1 MM HEIGHT, LEAD FREE, SOT-23, 5 PIN
CAT37TDI-GT3	ONSEMI	获取价格	CMOS White LED Driver Boost Converter

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