Capable of delivering LED currents up to 500 mA total, Catalyst Semiconductor's CAT4134 dual-channel, inductive-boost LED driver offers a fully integrated switching function that lets designers set the exact flash or movie modes required using one resistor, minimizing the need for external components. Each of the match channels can drive two or three LEDs. The chip's input supply can be as low as 3 V, making it well-suited for Li-ion battery-powered applications. Typical uses include industrial video lighting, still cameras, flashlights, LCD backlighting, and other high-power LEDs systems. Output current levels are controlled by one of two resistors, RSET or RFLASH. When the flash input pin is low (movie mode), RSET controls the LED current. When the flash input pin is high (flash mode), RFLASH controls the LED current.
The device's high-frequency, low-noise operation allows the CAT4134 to be used with small external inductors and ceramic capacitors while retaining efficiencies up to 85%. When disabled, the chip can be placed into a “zero” quiescent mode via a shutdown pin, eliminating battery drain when not in use. In addition to soft-start control and current limiting, the device offers protection against short-circuit and thermal overload fault conditions. A dedicated over-voltage protection pin lets users set the maximum operating voltage at the output. The CAT4134 comes in a 3- by 3-mm, 12-pin RoHS-compliant TDFN package.
Samples of the CAT4134 and evaluation kits are available now. Projected lead times for production quantities are six to eight weeks after receipt of an order.
The CAT4134 (ordering code CAT4134HV2) costs $0.88 each in quantities of 10,000.
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