AP3615

Data Sheet 5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615 General Description The AP3615 is a step-up DC-DC converter based on 1x/1.5x charge pump and low dropout current sink, which helps it maintain the highest efficiency. The AP3615 is specially designed to drive up to 5 WLEDs in backlight display. The AP3615 provides up to 20mA current for each WLED. There are totally 16 steps of current control, which is achieved through a digital pulse dimming function on EN pin. Additionally, 1MHz high switching frequency enables the use of small external capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up and mode transition. The supply voltage of AP3615 ranges from 2.8V to 5.5V which make it ideally suit for applications powered by Li-ion battery. The AP3615 is available in the tiny package of QFN-3×3-16. Features Regulated Output Current with ±3% Matching Drives up to 5 WLEDs at 20mA Each 16 Steps Brightness Control Using Pulse Signal Dimming Wide Operating Voltage Range: 2.8V to 5.5V High Operating Frequency: 1MHz Auto 1x/1.5x Charge Pump Mode Selection Built-in Soft-start Output Over Voltage Protection Built-in UVLO Built-in OTSD Operating Temperature Range: -40°C to 85°C Applications Mobile Phone PDA MP3/4 Jan. 2013 Rev. 1. 3 QFN-3×3-16 Figure 1. Package Type of AP3615 BCD Semiconductor Manufacturing Limited 1 Data Sheet 5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615 Pin Configuratio...