Diodes AP2502 User Manual

4-CH Linear Constant Current Sink With Matching AP2502

Data Sheet

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 power e d di spl ay 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 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

LED

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

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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

1 EN

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

Chip enable pin, active high to permit PWM signal input for brightness control by changing duty cycle

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Data Sheet

4-CH Linear Constant Current Sink With Matching AP2502

Functional Block Diagram

Figure 3. Functional Block Diagram of AP2502

Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

4-CH Linear Constant Current Sink With Matching AP2502

Ordering Information

AP2502 -

Circuit Type G1: Green

Package K: SOT-23-6 KT: TSOT-23-6

Package

SOT-23-6

TSOT-23-6

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant

and Green.

Temperature

Range

-40 to 85°C

Part Number Marking ID

AP2502KTR-G1 GEE Tape & Reel AP2502KTTR-G1 L7E Tape & Reel

TR: Tape & Reel

Packing

Type

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Enable Input Voltage VEN -0.3 to 6.5 V Thermal Resistance (Junction to Ambient) Operating Junction Temperature Range TJ 150 ºC Storage Temperature Range T

Lead Temperature (Soldering,10 seconds) T ESD (Machine Model) 600 V

ESD (Human Body Model) 6000 V

θ

JA

-65 to 150 ºC

STG

260 ºC

LEAD

250 ºC/W

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited

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