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CAT4134_08 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 500mA Dual Channel Movie/Flash LED Driver | |||
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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
Quantity
Part Number Package per Reel
CAT4134HV2-T2 TDFN-12 (1) 2,000
CAT4134HV2-GT2 TDFN-12 (2) 2,000
Package
Marking
HAAS
HAAU
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
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 âzeroâ
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.
PIN CONFIGURATION
12-Pad TDFN 3mm x 3mm
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
TYPICAL APPLICATION CIRCUIT
VIN
3V to 4.2V C1
10µF
OFF ON
RFLASH
18kâ¦
RSET
20kâ¦
L
D
22µH
SW
VIN
EN CAT4134
FLASH
LED1
RFLASH
LED2
RSET
OVP
AGND
PGND
C2
10µF
VOUT
L = Sumida CDRH3D16-220
D = Central CMDSH05-4 (500mA)
C2 = 10µF (rated 16V)
R1
1Mâ¦
R2
100kâ¦
Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice.
Doc. No. MD-5021 Rev. B
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