Datasheet > CAT37_05

CAT37_05

更新时间： 2024-11-25 04:35:43

品牌	Logo	应用领域
CATALYST		驱动器转换器升压转换器
页数	文件大小	规格书
12页	557K
描述
CMOS White LED Driver Boost Converter

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中文翻译

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CAT37_05 数据手册

CAT37

CMOS White LED Driver Boost Converter

FEATURES

I Low quiescent ground current (0.5mA typical)

I Power efficiency over 80%

I Drives up to 4 White LEDs in series

I Shutdown current less than 1µA

I Compatible pinout with LT1937

I Load fault protection against open-circuits

I Low value external components

I Adjustable output current (up to 40mA)

I High frequency 1.2MHz operation

I Input voltage operation down to 2.5V

I Low resistance (0.5Ω) power switch

I Low profile 5-lead SOT23 (1mm max) package

APPLICATIONS

I Color LCD and keypad backlighting

I Cellular phones

I Digital cameras

I PDAs/Games

I Handheld terminals

I Portable MP3 players

DESCRIPTION

A high voltage output stage allows up to 4 White LEDs

to be driven in series. Series drive provides inherent

current matching.

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.

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.

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.

In addition to overcurrent limiting protection, the device

also includes detection circuitry to ensure protection

against open-circuit load fault conditions.

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

5-lead thin SOT23 package.

TYPICAL APPLICATION

VIN

3 V to 5 V

VIN

15mA

CAT37

SHDN

OFF ON

GND

C1: Taiyo Yuden JMK212BJ475

C2: Taiyo Yuden EMK212BJ105

D1: Zetez ZHCS400

L1: Panasonic ELJEA6R8 or equivalent

SOT23 Pin Numbers

Figure 1. Driver for Four High-Brightness White LEDs

Characteristics subject to change without notice

Doc. No. 5005, Rev. S

12 3 4 5 6 7...12

中文翻译

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与CAT37_05相关器件

型号	品牌	获取价格	描述	数据表
CAT37_08	TI	获取价格	CMOS White LED Driver Boost Converter
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

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