CAT4134 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 500mA Dual Channel Movie/Flash LED Driver

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