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CAT4137

Catalyst Semiconductor
Part Number CAT4137
Manufacturer Catalyst Semiconductor
Description CMOS Boost Converter - White LED Driver
Published Apr 19, 2007
Detailed Description CAT4137 CMOS Boost Converter - White LED Driver Features • • • • • • • • • • • • Drives up to 5 White LEDs from 3V Powe...
Datasheet PDF File CAT4137 PDF File

CAT4137
CAT4137

Overview
CAT4137 CMOS Boost Converter - White LED Driver Features • • • • • • • • • • • • Drives up to 5 White LEDs from 3V Power Efficiency up to 87% Low Quiescent Ground Current 0.
1mA Adjustable Output Current (up to 30mA) High Frequency 1MHz Operation “Zero” current shutdown mode Operates down to 2V (from two AA batteries) Soft start power-up Open LED low power mode Automatic shutdown at 1.
9V (UVLO) Thermal shutdown protection Thin SOT23 5-Lead (1mm max height) Product Description The CAT4137 is a DC/DC step-up converter that delivers a regulated output current.
Operation at a constant switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor.
The device drives a string of white LEDs connected in series and provides the regulated current to control the LEDs with inherent uniform brightness and matching.
An external resistor R1 sets the output current and allows up to 30mA current to be supported over a wide range of input supply volt...


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