Datasheet > CAT3644

CAT3644

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
CATALYST		驱动器
页数	文件大小	规格书
14页	294K
描述
4-Channel Ultra High Efficiency Quad-Mode TM LED Driver

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CAT3644 数据手册

CAT3644

4-Channel Ultra High Efficiency Quad-Mode™

LED Driver

FEATURES

DESCRIPTION

High efficiency 1.33x charge pump

Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x

Drives up to 4 LEDs at 25mA each

1-wire EZDim™ LED current programming

Power efficiency up to 92%

The CAT3644 is a high efficiency quad-mode

fractional charge pump that can drive up to four LEDs

programmable by a one wire digital interface. The

inclusion of a 1.33x fractional charge pump mode

increases device efficiency by up to 10% over tradi–

tional 1.5x charge pumps with no added external

capacitors.

Low noise input ripple in all modes

“Zero” current shutdown mode

Soft start and current limiting

Low noise input ripple is achieved by operating at a

constant switching frequency which allows the use of

small external ceramic capacitors. The multi-fractional

charge pump supports a wide range of input voltages

from 2.5V to 5.5V.

Short circuit protection

Thermal shutdown protection

The EN/DIM logic input functions as a chip enable and

a digital dimming interface for current setting of all

LEDs. Six different current ratios are available via the

interface.

3mm x 3mm, 16-lead TQFN package

APPLICATION

LCD Display Backlight

Cellular Phones

The device is available in the tiny 16-lead TQFN

3mm x 3mm package with a max height of 0.8mm.

Digital Still Cameras

Handheld Devices

The 1.33x charge pump with two fly capacitors is a

patent pending architecture exclusive to Catalyst

Semiconductor.

ORDERING INFORMATION

Part

Number

Package

Marking

Package

For Ordering Information details, see page 13.

CAT3644HV3-T2 TQFN-16 3x3mm⁽¹⁾

Note: (1) Matte-Tin Plated Finish (RoHS-compliant)

PIN CONFIGURATION

JAAG

TYPICAL APPLICATION CIRCUIT

1µF

C1+

C1- C2+

C2-

16 15 14 13

White LEDs

OUT

CIN

1µF

2.4V

5.5V

LED2

LED3

LED4

RSET

12 C2-

OUT

1µF

CAT3644

11 C2+

10 C1-

LED1

LED2

LED3

LED4

1-Wire

EZDim^TMꢀ

EN/DIM

RSET

20mA

Programming

C1+

3.8kΩ

GND

Characteristics subject to change without notice

Doc. No. 5023, Rev. B

12 3 4 5 6 7...14

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