CAT4134

Catalyst Semiconductor, Inc.

1

Doc. No. MD-5021 Rev. B

Characteristics subject to change without notice.

500mA Dual Channel Movie/Flash LED

Driver

FEATURES

Dual Mode (Movie or Flash) operation

Independent Movie/Flash LED current control

Can drive 2, 3, 4 or 6 LEDs

High LED Current (250mA max per channel)

Power efficiency up to 85%

Dual frequency mode 1.2MHz and 900kHz

Soft-start inrush current

Adjustable overvoltage protection

Thermal shutdown protection

Operating temperature range -40ºC to +85ºC

12-pad TDFN 3mm x 3mm package

APPLICATIONS

Flash light

High-power white LEDs

Digital still cameras

Color LCD backlighting

ORDERING INFORMATION

Part Number

Package

Quantity

per Reel

Package

Marking

CAT4134HV2-T2

TDFN-12

(1)

2,000

HAAS

CAT4134HV2-GT2 TDFN-12

(2)

2,000

HAAU

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

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

PIN CONFIGURATION

12-Pad TDFN 3mm x 3mm

Top View

DESCRIPTION

The CAT4134 is a high power, dual channel boost

converter which provides two matched LED currents.

Output current levels are controlled by one of two

resistors RSET or RFLASH. When the FLASH input pin

is low (movie mode), RSET sets the current. When

FLASH is high (flash mode), the resistor RFLASH sets

the LED current. Each channel drives two or three white

LEDs in series and provides a regulated current to

control their brightness. Input supply down to 3V is

supported, making the device ideal for Li-Ion battery

applications.

High frequency low noise operation allows the device to

be used with small external inductors and ceramic

capacitors while still maintaining excellent efficiency.

When not in use the device can be placed into a “zero”

quiescent mode via the shutdown pin.

In addition to soft-start control and current limiting, the

CAT4134 include thermal shutdown protection. A

dedicated overvoltage pin (OVP) allows the user to limit

the maximum LED supply voltage. The device is

packaged in the 12-pad TDFN 3mm x 3mm.

For Ordering Information details, see page 12.

TYPICAL APPLICATION CIRCUIT

FLASH

EN

PGND

AGND

LED2

LED1

OVP

SW

SW

VIN

RSET

RFLASH

1

2

TAB is GND

3

4

5

6

12

11

10

9

8

7

VOUT

RSET

20kΩ

RFLASH

18kΩ

10µF

C2

L

D

LED2

OVP

LED1

AGND

PGND

CAT4134

VIN

EN

FLASH

RFLASH

RSET

SW

OFF ON

22µH

3V to 4.2V

10µF

C1

VIN

100kΩ

1MΩ

L = Sumida CDRH3D16-220

D = Central CMDSH05-4 (500mA)

C2 = 10µF (rated 16V)

R1

R2