White LED Driver, CMOS Boost Converter, High Voltage

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Overview

The CAT4237 is a DC-DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a constant switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. LED currents up to 40 mA can be supported over a wide range of input supply voltages from 2.8 V to 5.5 V, making the device ideal for battery-powered applications. The CAT4237 high-voltage output stage is perfect for driving six, seven or eight white LEDs in series with inherent current matching in LCD backlight applications.

LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with 'zero' quiescent current.

In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during 'Open LED' fault conditions.

  • Color LCD and Keypad Backlighting
  • Digital Cameras
  • Mobile Phones
  • Portable Gaming Systems
  • Drives 6 to 8 White LEDs in series from 3 V
  • Up to 87% efficiency
  • Low Quiescent Ground Current 0.6 mA
  • Adjustable Output Current (up to 40 mA)
  • High Frequency 1 MHz Operation
  • High Voltage Power Switch
  • Shutdown current less than 1 µA
  • Open LED low power mode
  • Automatic Shutdown at 1.9 V (UVLO)
  • Thermal shutdown protection
  • Digital Still Cameras

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CAT4237TD-GT3

Active

Pb

A

H

P

TSOT-23-5

1

260

REEL

3000

Y

Step-Up

2.8

5.5

30

100

1000

$0.672

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