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Linear LED Drivers | CAT4240

LED Driver, Boost Converter, 6 Watt

Obsolete

Datasheet

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Overview

The CAT4240 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. The CAT4240 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 for Portable Electronics

  • GPS Navigation Systems
  • Portable Media Players
  • Digital Still Cameras

  • Switch Current Limit 750 mA
  • Drives High Voltage LED strings (38 V)
  • Up to 94% Efficiency
  • Low Quiescent Ground Current 0.6 mA
  • 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

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CAT4240TD-GT3

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Obsolete

CAD Model

Pb

A

H

P

TSOT-23-5

419AE

1

260

REEL

3000

N

5.5

350

10

1

Price N/A

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