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Data Sheet

5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615

Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

General Description

The AP3615 is a step-up DC-DC converter based on

1x/1.5x charge pump and low dropout current sink,

which helps it maintain the highest efficiency. The

AP3615 is specially designed to drive up to 5

WLEDs in backlight display.

The AP3615 provides up to 20mA current for each

WLED. There are totally 16 steps of current control,

which is achieved through a digital pulse dimming

function on EN pin. Additionally, 1MHz high

switching frequency enables the use of small external

capacitors. Internal soft-start circuitry prevents

excessive inrush current during start-up and mode

transition.

The supply voltage of AP3615 ranges from 2.8V to

5.5V which make it ideally suit for applications

The AP3615 is available in the tiny package of

QFN-3×3-16.

Features

• Regulated Output Current with ±3% Matching

• Drives up to 5 WLEDs at 20mA Each

• 16 Steps Brightness Control Using Pulse Signal

Dimming

• Wide Operating Voltage Range: 2.8V to 5.5V

• High Operating Frequency: 1MHz

• Auto 1x/1.5x Charge Pump Mode Selection

• Built-in Soft-start

• Output Over Voltage Protection

• Built-in UVLO

• Built-in OTSD

• Operating Temperature Range: -40°C to 85°C

Applications

• Mobile Phone

• PDA

• MP3/4

Figure 1. Package Type of AP3615

QFN-3×3-16

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