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CAT37 - CMOS White LED Driver

General Description

The CAT37 is a DC/DC step up converter that delivers a regulated output current.

Operation at a constant switching frequency of 1.2 MHz allows the device to be used with very small value external inductor and ceramic capacitors.

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Key Features

  • Low Quiescent Ground Current (0.5 mA Typical).
  • Power Efficiency Over 80%.
  • Compatible Pinout with LT1937.
  • Adjustable Output Current (up to 40 mA).
  • High Frequency 1.2 MHz Operation.
  • Input Voltage Operation down to 2.5 V.
  • Low Resistance (0.5 W) Power Switch.
  • Drives up to 4 White LEDs in Series.
  • Shutdown Current Less than 1 mA.
  • Load Fault Protection Against Open.
  • circuits.
  • Low Value External Co.

📥 Download Datasheet

Datasheet Details

Part number CAT37
Manufacturer onsemi
File Size 312.01 KB
Description CMOS White LED Driver
Datasheet download datasheet CAT37 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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CAT37 CMOS White LED Driver Boost Converter Description The CAT37 is a DC/DC step up converter that delivers a regulated output current. Operation at a constant switching frequency of 1.2 MHz allows the device to be used with very small value external inductor and ceramic capacitors. The CAT37 is targeted to drive multiple white light−emitting diodes (LEDs) connected in series and provides the necessary regulated current to control the brightness and the color purity. An external resistor R1 controls the output current level. LED currents of up to 40 mA can be supported over a wide range of input supply voltages from 2.5 V to 7 V, making the device ideal for battery−powered applications. A high voltage output stage allows up to 4 White LEDs to be driven in series.