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PT4301

Powtech
Part Number PT4301
Manufacturer Powtech
Description 4 Channel 1x/1.5x Auto-Adjust Charge Pump White LED Driver
Published Jan 19, 2015
Detailed Description PT4301, PT4303 4 Channel 1×/1.5× Auto-Adjust Charge Pump White LED Driver GENERAL DESCRIPTION The PT4301/03 is a 4-chann...
Datasheet PDF File PT4301 PDF File

PT4301
PT4301


Overview
PT4301, PT4303 4 Channel 1×/1.
5× Auto-Adjust Charge Pump White LED Driver GENERAL DESCRIPTION The PT4301/03 is a 4-channel 1x/1.
5x auto-adjust charge pump white LED driver that achieves high efficiency for Li-Ion battery supply.
The LED current can be set by an external resistor.
Only one small resistor and four 1µF small ceramic capacitors are needed as external components to construct a LED driver, which makes the PT4301/03 an ideal choice for portable applications.
The LED fault detection circuit in the PT4301/03 improves the reliability of the system.
The PT4301/03 has three dimming modes that allow users to adjust the brightness of the four LEDs individually or all together.
The first two dimming modes can be controlled through the EN/SET pin either by applying a serial digital code, in which case the LED currents can be set with eight levels of up to 20mA, or by providing a pulse-width-modulation (PWM) signal input.
The third dimming mode relies on the feature that the four LEDs can be turned on and off selectively by a three-bit digital code at the three control inputs in the PT4301, or a two-bit digital code at the two control inputs in the PT4303.
Therefore, individual dimming control can be realized by applying PWM signals at those control inputs.
The built-in soft-start circuit eliminates the inrush current during power on and 1x/1.
5x mode switching.
Thermal shut down and current limiter prevent the PT4301/03 from being damaged by high level current through the device.
The ultra small shutdown current of less than 1µA extends the battery life significantly.
The PT4301/03 is available in a QFN-16 package.
FEATURES z 1×/1.
5× auto-adjust charge pump z LED current set by external resistor z Programmable 4-channel LED current up to 20mA with 8 levels control through en/set pin z Individual LED dimming control through PWM signals at 3 (PT4301) or 2 (PT4303) control inputs z LED fault detection z <3% channel to channel current mismatch z Less than 1uA shut down...


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