A8430 Datasheet - Allegro MicroSystems

A8430 - White LED Driver Constant Current Step-up Converter

Surface Mount Lead-Free, Surface Mount Data Sheet 26185.300C White LED Driver Constant Current Step-up Converter Functional Block Diagram FB SW A8430 VIN VREF 1.25 V 95 mV A1 RC CC A2 R S Q Driver Σ Ramp Generator EN Enable 1.2 MHz Oscillator GND ELECTRICAL CHARACTERISTICS at TA = 25°C,.

www.DataSheet4U.com A8430 White LED Driver Constant Current Step-up Converter The A8430 is a noninverting boost converter that steps-up the input voltage, to provide a programmable constant current output at up to 36 V for driving white LEDs in series. Driving LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to seven white LEDs can be driven by increasing the supply volta.

A8430 Features

* Output voltage up to 36 V 2.5 V to 10 V input Drives up to 4 LEDs at 20 mA from a 2.5 V supply Drives up to 5 LEDs at 20 mA from a 3 V supply 1.2 MHz switching frequency 300 mA switch current limit 1 µA shutdown current ABSOLUTE MAXIMUM RATINGS SW Pin

* 0.3 V to 36 V Remaining Pins

A8430_AllegroMicroSystems.pdf