CAT4240
6 Watt Boost LED Driver
Description
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 mod...