AP3605 Datasheet | BCD Semiconductor

Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 General Description Features The AP3605 is a step-up DC/DC converter based on 1.5x charge pump current source, it is specially designed for LED supplies in backlight display. The AP3605 can provide constant current up to 20m A for each LED, which is programmed by an external resistor, so it has a total capability to provide 80m A for 4 LEDs. The chip has a good performance of LED current matching and allows PWM brightness dimming control. Additionally, high switching frequency up to 1MHz enables the use of two small external flying capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up. The AP3605 supply voltage range is from 2.7V to 5.5V, ideally suited for applications powered by the Liion battery. - Regulated Output Current with ±3% Matching - Regulated ±10% Output Current Source - Drive up to 4 LEDs at 20m A Each - Wide Operating Voltage Range: 2.7V to 5.5V - High Efficiency up to 93% - High Operating Frequency: 1MHz - Built-in Soft-Start to Limit the Inrush Current - LED Brightness Control through PWM and Ana- log Signal - PWM Dimming Frequency up to 50k Hz - Built-in Standby Mode to Get PWM Dimming Duty Cycle Control Linearity - Built-in OTSD (Over Temperature Shutdown) Function to Protect the Device from Burn Out Applications The AP3605 is available in a 3mmx3mm QFN-3x3-16 tiny package. Its operating temperature range is -40o C to 85o C. - - - Mobile Phone MP3, MP4 White LED Backlight in Mobile Phone, PDA Jan. 2013 Rev. 1. 8 QFN-3x3-16 Figure 1. Package Type of AP3605 BCD Semiconductor Manufacturing Limited 1 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Pin...