GENERAL DESCRIPTION
Auto-adjust charge pump achieve high efficiency for Li-Ion battery supply. Three LED dimming modes enable user to dimming 1 to 4 LED all together or separately. And the current can also be regulated from 3mA to 25mA in 3mA step by the EN/SET pin, which is a digital interface to enable, disable the chip and set the LED current. And which LED is on or off can be controlled by 3 control terminals, so you can dim each LED by PWM control signals. Built-in soft-start circuit prevents the inrush current from supply source during power on and 1x/1.5x mode change. Thermal shut down and current limiter prevent the PT4301 damaged by the high-level current through it. Shut-down current less than 1uA make the battery time longer. PT4301 is packaged with QFN-16. FEATURES
♦ ♦ ♦ ♦ ♦ ♦ ♦ 3V-5.5V input voltage 1x/1.5x auto-adjust charge pump Set LED current by external resistor Programming 4-channel LED current up to 25mA with 8 levels through EN/SET pin Dimming LED by PWM signal thr...
