Datasheet > CAT4237_08

CAT4237_08

更新时间： 2024-11-21 04:01:19

品牌	Logo	应用领域
CATALYST		驱动器
页数	文件大小	规格书
14页	301K
描述
High Voltage CMOS Boost White LED Driver

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中文翻译

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CAT4237_08 数据手册

CAT4237

High Voltage CMOS Boost White LED Driver

FEATURES

DESCRIPTION

Drives 6 to 8 White LEDs in series from 3V

Up to 87% Efficiency

Low Quiescent Ground Current 0.6mA

Adjustable Output Current (up to 40mA)

High Frequency 1MHz Operation

High Voltage Power Switch

Shutdown current less than 1µA

Open LED low power mode

Automatic Shutdown at 1.9V (UVLO)

Thermal shutdown protection

RoHS-compliant

The CAT4237 is a DC/DC step-up converter that

delivers an accurate constant current ideal for driving

LEDs. Operation at a constant switching frequency of

1MHz allows the device to be used with small value

external ceramic capacitors and inductor. LEDs

connected in series are driven with a regulated current

set by the external resistor R₁. LED currents up to 40mA

can be supported over a wide range of input supply

voltages from 2.8V to 5.5V, making the device ideal for

battery-powered applications. The CAT4237 high-

voltage output stage is perfect for driving six, seven or

eight white LEDs in series with inherent current matching

in LCD backlight applications.

Thin SOT23 5-Lead (1mm max height)

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 “zero” quiescent current.

APPLICATIONS

Color LCD and keypad Backlighting

Cellular Phones

Handheld Devices

Digital Cameras

In addition to thermal protection and overload current

limiting, the device also enters a very low power operating

mode during “Open LED” fault conditions. The device is

housed in a low profile (1mm max height) 5-lead thin

SOT23 package for space critical applications.

PDAs

Portable Game Machine

ORDERING INFORMATION

Quantity

per Reel

Package

Marking

For Ordering Information details, see page 13.

Part Number

Package

CAT4237TD-T3 TSOT23-5 ⁽¹⁾

CAT4237TD-GT3 TSOT23-5 ⁽²⁾

3000

Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).

(2) NiPdAu Plated Finish (RoHS-compliant).

PIN CONFIGURATION

TYPICAL APPLICATION CIRCUIT

5-Lead Thin SOT23

(1mm max height)

OUT

33µH

3V to

4.2V

GND

VIN

4.7µF

0.22µF

VIN

CAT4237

SHDN FB

GND

SHDN

= 300mV

20mA

OFF ON

15Ω

Top View

L: Sumida CDRH3D16-330

D: Central CMDSH05-4 (rated 40V)

C2: Taiyo Yuden UMK212BJ224 (rated 50V)

Characteristics subject to change without notice

Doc. No. MD-5013, Rev. B

12 3 4 5 6 7...14

中文翻译

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与CAT4237_08相关器件

型号	品牌	获取价格	描述	数据表
CAT4237TD	CATALYST	获取价格	High Voltage CMOS Boost White LED Driver
CAT4237TD-GT3	CATALYST	获取价格	High Voltage CMOS Boost White LED Driver
CAT4237TD-GT3	ONSEMI	获取价格	High Voltage CMOS Boost White LED Driver
CAT4237TD-T3	ONSEMI	获取价格	High Voltage CMOS Boost White LED Driver
CAT4237TD-T3	CATALYST	获取价格	High Voltage CMOS Boost White LED Driver
CAT4237TS	CATALYST	获取价格	High Voltage CMOS Boost White LED Driver
CAT4238	CATALYST	获取价格	High Efficiency 10 LED Boost Converter
CAT4238	ONSEMI	获取价格	High Efficiency 10 LED Boost Converter
CAT4238_07	CATALYST	获取价格	High Efficiency 10 LED Boost Converter
CAT4238TD-GT3	CATALYST	获取价格	High Efficiency 10 LED Boost Converter

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