Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 General Description Features Current Matching Between Each Channel: 1% The AP2502 is a 4-channel independent linear current sink with low dropout voltage and perfect Low Dropout Voltage: 65mV (Typ.) I = LED 20mA match between each channel. Each channel can provide 20mA continuous constant current. Maximum Output Current on Each Channel: 20mA Ultra-low Quiescent Current: 125 A (Typ.) In application, there is only one 0.1F ceramic capacitor required, and there is no any EMI and Ultra-low Shutdown Current: 1 A (Max.) switching noise issue. It is perfect choice for None EMI and Switching Noise Issue hand-hold portable system especially based on Permitted PWM Dimming Frequency up to Li-ion/Polymer battery powered display module. 150kHz OTSD Protection The brightness can be controlled and/or adjustable via simple PWM signal applied to EN pin. The AP2502 is available with SOT-23-6 and Applications TSOT-23-6 packages. Mobile Phone, Smart Phone, PDA MP3, MP4, PMP Small Size Backlight Module SOT-23-6 TSOT-23-6 Figure 1. Package Types of AP2502 Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 1 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Pin Configuration K/KT Package (SOT-23-6/TSOT-23-6) Figure 2. Pin Configuration of AP2502 (Top View) Pin Descriptions P in Number Pin Name Description Chip enable pin, active high to permit PWM signal input for brightness control by 1 EN changing duty cycle 2 GND GND 3, 4, 5, 6 LED4 to LED1 LED cathode terminal for channel number Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 2