Datasheet > CAT4238

CAT4238

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
CATALYST		转换器升压转换器
页数	文件大小	规格书
14页	280K
描述
High Efficiency 10 LED Boost Converter

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CAT4238 数据手册

CAT4238

High Efficiency 10 LED Boost Converter

FEATURES

DESCRIPTION

Drives High Voltage LED strings (38V)

The CAT4238 is a DC/DC step-up converter that delivers

an accurate constant current ideal for driving LEDs.

Operation at a fixed 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 up to 5.5V, making

the device ideal for battery-powered applications. The

CAT4238 high-voltage output stage is perfect for driving

mid-size and large panel displays containing up to ten

white LEDs in series.

Up to 87% Efficiency

Low Quiescent Ground Current 0.6mA

Adjustable Output Current

1MHz Fixed Frequency Low noise Operation

Soft start “in-rush” current limiting

Shutdown current less than 1μA

Open LED Overvoltage Protection

Automatic Shutdown at 1.9V (UVLO)

Thermal overload protection

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

GPS Navigation Systems

Portable Media Players

Handheld Devices, Digital Cameras

Portable Game Machines

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.

ORDERING INFORMATION

Quantity Package

per Reel Marking

Part Number

Package

TSOT23-5

Green*

CAT4238TD-GT3

3000

* NiPdAu Plated Finish

For Ordering Information details, see page 13.

TYPICAL APPLICATION CIRCUIT

PIN CONFIGURATION

VOUT

5-Lead Thin SOT23

(1mm max height)

VIN

47µH

4.7µF

GND

VIN

0.22µF

VIN

CAT4238

SHDN FB

GND

SHDN

(300mV)

20mA

OFF ON

15Ω

L: Sumida CDC5D23B-470

D: Central CMDSH05-4

C2: Taiyo Yuden UMK212BJ224 (rated 50V)

Characteristics subject to change without notice

Doc. No. 5019 Rev. A

12 3 4 5 6 7...14

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