021-54278989
1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver with Two
Dimming Modes GENERAL DESCRIPTION The PT4303 is a 4-channel 1x/1.5x auto-adjust charge pump white LED driver with three dimming modes. Auto-adjust charge pump achieves high efficiency for Li-Ion battery supply. The three LED dimming modes enable users to dim the four LEDs all together or individually. Only a few external components (two flying capacitors and two filter capacitors at VIN and VOUT) are needed, which makes the PT4303 ideally suited for mobile applications. The current through the LED can be set by an external resistor. The four LEDs can be turned on and off individually or in a group of two to four through the two control terminals, which can also be used to dim the LEDs by applying PWM control signals. Built-in soft-start circuit prevents the inrush current from the
power supply during power on and 1x/1.5x mode change. The thermal
shutdown and current limiter prevent the PT4303 from being damaged
by a high-level current through it. A shutdown current of less than
1uA makes the battery last longer. The PT4303 is available in
QFN-16 package. FEATURES 3V-5.5V input voltage 1x/1.5x auto-adjust charge pump Set LED current by external resistor Dimming LED by PWM signal through 2 control terminal LED fault detection <3% current mismatch No inductor Less than 1uA shutdown current Built-in soft-start and soft mode decision APPLICATIONS Cell phones Laptop computers and PDAs Digital cameras Small LCD displays Programmable current sink TYPICAL APPLICATIONS |
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