Product category: Power Supply ICs and Controllers
News Release from: Catalyst Semiconductor | Subject: CAT4134
Edited by the Electronicstalk Editorial Team on 23 October 2006
LED driver powers
up handset camera lights
Catalyst Semiconductor has announced the availability of a high power, 500mA inductive boost LED driver for movie/flash mode applications
The CAT4134 offers a fully integrated movie/flash switching function which allows designers to set the exact flash and movie modes required via a single resistor, minimising the need for external circuitry. Capable of driving up to six white/colour LEDs, the CAT4134 is ideal for increasing efficiency and simplifying the design of industrial video lighting, still camera, flashlight, LCD backlighting and other high-power LED applications.
This article was originally published on Electronicstalk on 23 October 2006 at 8.00am (UK)
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The new Catalyst inductive boost LED driver offers dual channel outputs which provide matched LED currents of up to 500mA total.
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), the resistor Rflash controls the LED current.
Each channel drives two or three white LEDs in series and provides a regulated current to control LED brightness.
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Each LDO in the CAT6221 has an independent enable pin and, combined, offer low quiescent current, 1% initial accuracy, and a very low typical dropout voltage
Input supply down to 3V is supported, making the device ideal for Li-ion battery applications.
High frequency, low noise operation allows the CAT4134 to be used with small external inductors and ceramic capacitors while retaining excellent efficiency (up to 85%), making it a good choice for space and power-constrained applications.
When disabled the device 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 CAT4134 offers protection against short-circuit and thermal overload fault conditions.
A dedicated overvoltage protection pin (OVP) allows users to set the maximum operating voltage at the output.
According to Scott Brown, Vice President of Marketing for Catalyst Semiconductor: 'We are announcing the CAT4134 inductor-based LED driver very quickly after our most recent charge pump device, the Quad-Mode CAT3636, underscoring our commitment to offer an extensive range of LED driver technologies'.
'Each customer has unique system design goals, therefore Catalyst's strategy is to offer both inductor-based and charge pump options to provide the best solution for our customers' specific application requirements'.
The CAT4134 is available in a 3 x 3mm, 12-pin TDFN RoHS-compliant package.
Plated lead finish is matte tin.
The ordering code is CAT4134HV2 and pricing for 10,000 piece quantities is $0.88 each.
Samples and evaluation kits are now available.
Projected lead-times for production quantities are currently 6 to 8 weeks ARO.
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