LED Driver, Boost Converter, High Efficiency

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Overview

The CAT4238 is a DC-DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed 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 up to 5.5 V, making the device ideal for battery-powered applications. The CAT4238 high-voltage output stage is perfect for driving mid-size and large panel displays containing up to ten white LEDs in series.

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.

  • LED Drive in battery Powered Devices
  • GPS Navigation Systems
  • Portable Gaming Systems
  • Digital Still Cameras
  • Drives High Voltage LED strings (38 V)
  • Up to 87% Efficiency
  • Low Quiescent Ground Current 0.6 mA
  • Adjustable Output Current
  • 1 MHz Fixed Frequency Low noise Operation
  • Soft start “in-rush” current limiting
  • Shutdown current less than 1 µA
  • Open LED Overvoltage Protection
  • Automatic Shutdown at 1.9 V (UVLO)
  • Thermal overload protection
  • Mid-size and Large Panel Displays

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CAT4238TD-GT3

Active

Pb

A

H

P

TSOT-23-5

1

260

REEL

3000

Y

Step-Up

2

5.5

38

100

1000

$0.6113

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