CAT37TDI datasheet(1/13 Pages) CATALYST

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1

CAT37

CMOS White LED Driver Boost Converter

Characteristics subject to change without notice

Doc No. 5005, Rev. R

TYPICAL APPLICATION

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

2

3

1

5

4

SW

VIN

SHDN

D1

VIN

3 V to 5 V

CAT37

FB

GND

OFF ON

15mA

FEATURES

s Low quiescent ground current (0.5mA typical)

s Power efficiency over 80%

s Compatible pinout with LT1937

s Adjustable output current (up to 40mA)

s High frequency 1.2MHz operation

s Input voltage operation down to 2.5V

s Low resistance (0.5

Ω

Ω) power switch

s Drives up to 4 White LEDs in series

s Shutdown current less than 1

µA

s Load fault protection against open-circuits

s Low value external components

s Low profile 5-lead SOT23 (1mm max) and

TDFN (0.8mm) package

DESCRIPTION

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.

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.

APPLICATIONS

s Color LCD and keypad backlighting

s Cellular phones

s Handheld terminals

A high voltage output stage allows up to 4 White LEDs

to be driven in series. Series drive provides inherent

current matching.

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.

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 and in a TDFN (0.8mm max

height) package.

s Digital cameras

s PDAs/Games

s Portable MP3 players

ALO

GEN FR

TM

LEAD FREE

Số phần tương tự - CAT37TDI

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
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Texas Instruments	CAT37TDI-T3	248Kb / 13P	CMOS White LED Driver Boost Converter
ON Semiconductor	CAT37TDI-T3	187Kb / 13P	CMOS White LED Driver Boost Converter Doc. No. MD-5005 Rev. V

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