CAT4134
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
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.
APPLICATIONS
C
amera flash
Flash light
High-power white LEDs
Digital still cameras
Color LCD backlighting
ORDERING INFORMATION
Part Number
CAT4134HV2
* Matte-Tin Finish
Package
Thin DFN-12
Lead Free*
Quantity Package
per Reel Marking
2000
HAAS
TYPICAL APPLICATION CIRCUIT
VIN
3V to 4.2V
C1
10µF
VIN
EN
OFF ON
L
22µH
D
C2
SW
10µF
R1
VOUT
CAT4134
LED1
LED2
OVP
1MΩ
PIN CONFIGURATION
Top View
RFLASH
FLASH
RFLASH
RSET
RSET
20kΩ
AGND
FLASH
EN
PGND
AGND
LED2
LED1
1
2
3
4
5
6
TAB is GND
12 OVP
11 SW
10 SW
9
8
7
VIN
RSET
RFLASH
18kΩ
R2
PGND
100kΩ
L = Sumida CDRH3D16-220
D = Central CMDSH05-4 (500mA)
C2 = 10µF (rated 16V)
12-Pad TDFN 3mm x 3mm
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice.
1
Doc. No. 5021 Rev. A
CATALYST [ CATALYST SEMICONDUCTOR ]
