AP3606 Datasheet, PDF (1/18 Pages) BCD Semiconductor Manufacturing Limited – 4/6 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER

Preliminary Datasheet
4/6 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3606/AP3607
General Description
The AP3606 and AP3607 are step-up DC-DC
converters based on 1x/1.5x charge pump and low
dropout current sink, which helps them maintain the
highest efficiency. The AP3606 is specially designed
to drive up to 4 WLEDs in backlight display while
the AP3607 is designed for 6 WLEDs.
These devices provide 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 ranges of AP3606 and AP3607
are from 2.7V to 5.5V which make them ideally suit
for applications powered by Li-ion battery.
These ICs are available in the tiny package of
QFN-3×3-16.
Features
• Regulated Output Current with ±3% Matching
• Drives up to 4 WLEDs at 20mA Each (AP3606)
Drives up to 6 WLEDs at 20mA Each (AP3607)
• 16 Steps Brightness Control Using Pulse Signal
Dimming
• Wide Operating Voltage Range: 2.7V 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
QFN-3×3-16
Figure 1. Package Type of AP3606/AP3607
Dec. 2008 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1