High Efficiency 10 LED Boost Converter
CAT4238
High Efficiency 10 LED Boost Converter
Description
The CAT4238 is a DC/DC step−up converter that delivers an ac...
Description
CAT4238
High Efficiency 10 LED Boost Converter
Description
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 en...
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