AP2502

Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 General Description The AP2502 is a 4-channel independent linear current sink with low dropout voltage and perfect match between each channel. Each channel can provide 20mA continuous constant current. In application, there is only one 0.1µF ceramic capacitor required, and there is no any EMI and switching noise issue. It is perfect choice for hand-hold portable system especially based on Li-ion/Polymer battery powered display module. 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 TSOT-23-6 packages. Features Current Matching Between Each Channel: ±1% Low Dropout Voltage: 65mV (Typ.) @ ILED= 20mA Maximum Output Current on Each Channel: 20mA Ultra-low Quiescent Current: 125µA (Typ.) Ultra-low Shutdown Current: 1µA (Max.) None EMI and Switching Noise Issue Permitted PWM Dimming Frequency up to 150kHz OTSD Protection Applications 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 4-CH Linear Constant Current Sink With Matching Pin Configuration K/KT Package (SOT-23-6/TSOT-23-6) Data Sheet AP2502 Figure 2. Pin Configuration of AP2502 (Top View) Pin Descriptions P in Number 1 2 Pin Name EN GND Description Chip enable pin, active high to permit PWM signal inp...