Diodes AP2502 - Manual

Data Sheet
4-CH Linear Constant Current Sink With Matching AP2502
Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited
1
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 0.1
µF 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.) @ I
LED
=
20mA
• Maximum Output Current on Each Channel:
20mA
• Ultra-low Quiescent Current: 125
µA (Typ.)
• Ultra-low Shutdown Current: 1
µA (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
Figure 1. Package Types of AP2502
SOT-23-6 TSOT-23-6