The RT9364 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by
utilizing an x1/x1.5 fractional charge pump and low dropout current sources. The small equivalent x1 mode open loop resistance and ultra-low dropout voltage of current source
extend the operating time of x1 mode and optimize the
efficiency of Li-ion battery in white LED applications.
The RT9364 supports up to 4 white LEDs and regulates a
constant current for uniform intensity. The part implements
a 4-bit DAC for brightness control. Users can easily
configure the LED current from 1.25mA to 20mA by a serial
pulse. The dimming of white LEDs current can be achieved
by applying a pulse signal to the EN pin. There are totally
16 steps of current could be set by users. The operating
voltage range is 2.8V to 5.0V. Internal soft start circuitry
effectively reduces the in-rush current while both start-up
and mode transition. The load is disconnected from VIN
while shutdown and the shutdown current is less than 1μA.
RT9364 is available in a WQFN 3x3-16L package.