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CAT4134

Catalyst Semiconductor
Part Number CAT4134
Manufacturer Catalyst Semiconductor
Description 500mA Dual Channel Movie/Flash LED Driver
Published Apr 19, 2007
Detailed Description CAT4134 500mA Dual Channel Movie/Flash LED Driver FEATURES „ „ „ „ „ „ „ „ „ „ „ Dual Mode (Movie or Flash) operation I...
Datasheet PDF File CAT4134 PDF File

CAT4134
CAT4134

Overview
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 „ „ „ „ „ Camera flash Flash light High-power white LEDs Digital still cameras Color LCD backlighting www.
DataSheet4U.
com 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 For Ordering Information details, see page 12.
CAT4134 LED1 LED2 OVP 1MΩ PIN CONFIGURATION Top View RFLASH FLASH RFL...


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