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Data Sheet

4-CH Linear Constant Current Sink With Matching AP2502

Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited

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.) @ I

LED

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

Figure 1. Package Types of AP2502

SOT-23-6 TSOT-23-6

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