CAT3637HV3-GT2 datasheet(1/14 Pages) CATALYST

Part #	CAT3637HV3-GT2

Description	6-Channel Programmable High Efficiency Quad-Mode??LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT3637

1

Doc. No. MD-5033 Rev. A

Characteristics subject to change without notice

FEATURES

High efficiency 1.33x charge pump

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

Drives 6 LEDs between 30mA and 0mA each

1-wire EZDim

TM interface with 2mA step

Power efficiency up to 92%

Low noise input ripple in all modes

“Zero” current shutdown mode

Soft start and current limiting

Short circuit protection

Thermal shutdown protection

Tiny 3mm x 3mm, 16-pad TQFN package

APPLICATIONS

LCD Display Backlight

Cellular Phones

Digital Still Cameras

Handheld Devices

ORDERING INFORMATION

Part Number

Quantity

per Reel

Package

Marking

CAT3637HV3-GT2

2000

(1)

JAAM

Note:

(1) NiPdAu Plated Finish (RoHS-compliant)

16-lead TQFN 3mm x 3mm Package

DESCRIPTION

The CAT3637 is a high efficiency Quad-Mode fractional

charge pump that can drive up to six LEDs program-

mable by a 1-wire digital interface. The inclusion of a

1.33x fractional charge pump mode increases device

efficiency by up to 10% over traditional 1.5x charge

pumps with no added external capacitors.

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.

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

digital programming interface for setting the current in the

LED channels. The 1-wire pulse-programming interface

supports 15 linear steps from zero current to 30mA full-

brightness in 2mA steps.

The device is available in a tiny 16-pad TQFN 3 x 3mm

package with a maximum height of 0.8mm.

Catalyst Semiconductor’s Quad-Mode 1.33x, charge pump

switching architecture is patented.

For Ordering Information details, see page 13.

PIN CONFIGURATION

TYPICAL APPLICATION CIRCUIT

(top view)

6-Channel Programmable High Efficiency

Quad-Mode™ LED Driver

1

2

3

4

13

14

15

16

8

7

6

5

12

10

9

LED6

LED5

LED4

LED3

C2-

C2+

C1-

C1+

11

GND

VIN

2.5V

to

5.5V

LED1

LED2

LED3

LED4

LED5

LED6

EN/SET

CAT3637

VIN

VOUT

1µF

CIN

C1+

C1-

C2+

C2-

1µF

COUT

1-Wire

Programming

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CAT3637HV3-GT2 Datasheet(PDF) 1 Page - Catalyst Semiconductor

CAT3637HV3-GT2 Datasheet(HTML) 1 Page - Catalyst Semiconductor

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