Diodes AP3615 - Manual

Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited
1
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
powered by Li-ion battery.
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-3Ч3-16