Product category: Power Supply ICs and Controllers
News Release from: Prema Semiconductor | Subject: PR4401
Edited by the Electronicstalk Editorial Team on 24 March 2006
LED driver runs
from low-voltage sources
The new PR4401 driver consists of a step-up convertor with current output that provides an output voltage of typically 3.6V for white LEDs
The input voltage can be as low as 0.9V, thus allowing a single cell battery operation. Only one external component, an inductor, is required to operate up to three LEDs in series. A regulated current of up to 23mA depending on the inductor value provides a constant LED brightness independent of the supply voltage.
This article was originally published on Electronicstalk on 24 March 2006 at 8.00am (UK)
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The PR4401 offers a high efficiency of about 80% over the whole supply voltage range from 0.9 to 2V.
Thus the typical lifetime is more than 55 hours with an AA alkaline battery.
An inductor value of 22uH is recommended for a maximum battery life, and with a 10uH coil higher currents can be achieved for maximum white LED brightness.
When the supply voltage drops, the battery current will be reduced to less than 10uA to avoid deep discharge of the battery.
The PR4401 is available in a compact SOT23-3 package as well as dice on inked wafers.
This way size-sensitive applications can be realised with chip-on-board solutions.
This LED driver offers a low-cost two-component-solution (plus LEDs) for small LED flashlights or small-sized torches.
Further applications for the PR4401 are LCD backlighting, for example in MP3 players operated with only one alkaline battery cell.
Samples and demo boards are available on request. Request a free brochure from Prema Semiconductor....
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