Product Brief
CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL
AP3605
Description
BCD Semiconductor Manufacturing Limited
The AP3605 is a step-up DC/DC converter based on 1.5x
charge pump current source, it is specially designed for
LED supplies in backlight display.
The AP3605 can provide constant current up to 20mA for
http://www.bcdsemi.com
each LED, which is programmed by an external resistor,
so it has a total capability to provide 80 mA for 4 LEDs.
The chip has a good performance of LED current
matching and allows PWM brightness dimming control.
Additionally, high switching frequency up to 1 MHz
enables the use of two small external flying capacitors.
Internal soft-start circuitry prevents excessive inrush
current during start-up.
The AP3605 supply voltage range is from 2.7V to 5.5 V,
ideally suited for applications powered by the Li-ion
battery.
The AP3605 is available in a 3mm*3mm QFN-3x3-16
tiny package. Its operating temperature range is -40
o
C to
85
o
C
Parametric Table
Input Voltage (V)
Supply Current (Typ) (mA)
Operating Frequency (Typ) (MHz)
Efficiency (Typ) (%)
2.7 to 5.5
1.5
1.0
93
Output Current (Max) (mA)
Current Matching (Min/Max) (%)
Soft Start Time (Typ) (µS)
Standby Time
(Typ) (ms)
120
±
3
400
2.0
Package
QFN-3x3-
16
Features
IMPORTANT NOTICE
Benefits
or Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
·
Wide Input Voltage Range
·
Regulated Output Current with
any
Matching
D Semiconductor Manufacturing Limited does not assume
±3%
responsibility for use of any its products for any
·
Regulated
±10%
Output Current Source
nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of
·
application or use
the
High Current Matching Precision
or circuits. BCD Semiconductor
to 4 LEDs at 20 mA Each
not convey any license under its
Built-in Standby to Make PWM Dimming Control
patent rights or
·
·
Drive up
Manufacturing Limited does
rights of others.
·
Wide Operating Voltage Range: 2.7V to 5.5V
Optimized
·
High Efficiency up to 93%
anufacturing Limited
BCD
1MHz
·
High Operating Frequency:
Semiconductor Manufacturing Limited
- IC Design Group
·
Built-in Soft-Start to Limit the
Analog Circuits (Shanghai) Corporation
nductor Manufacturing Limited
Advanced
Inrush Current
200233, China
8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China
Additional Available
·
LED Brightness Control through PWM and Analog
+86-21-5450 0008
Tel: +86-21-6495 9539, Fax: +86-21-6485 9673
Signal
FFICE
·
Samples
USA Office
·
Built-in Standby Mode
Taiwan Office
PWM Dimming
to Make
nductor Manufacturing Co., Ltd. Shenzhen Office
BCD Semiconductor (Taiwan) Company Limited
BCD Semiconductor Corporation
·
Preliminary Datasheet
Control
Shanghai) Corporation Shenzhen Office
Optimized
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, 30920 Huntwood Ave. Hayward,
o.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Taiwan
CA 94544, U.S.A
·
Demo Board
·
Built-in OTSD (Over Temperature
2808
Tel: +886-2-2656
Shutdown) Func-
Tel : +1-510-324-2988
·
Application Note
Fax: +886-2-2656 2806
Fax: +1-510-324-2788
tion to Protect the Device from Burn Out
·
ESD Report
Materials
Applications
·
·
·
Mobile Phone
MP3, MP4
White LED Backlight in Mobile Phone, PDA
Jul. 2007
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
