A706
www.addmtek.com
DESCRIPTION
The A706 is a high voltage Boost driver with 6 channels
adjustable constant current regulators for notebook LED
backlight applications. Six regulated current ports are designed to
provide uniform and pure DC constant current sinks for driving
LEDs within a large range V
F
variations. It can drive a number of
LEDs in series/parallel configuration
Users may adjust the output current from 5mA to 40mA
through an external resistor, R
SET
, which gives users flexibility in
controlling the light intensity of LEDs. It also could adjust LED
brightness via PWM pin with Pulse Width Modulation signal
A feedback circuit is built in the between of Boost Driver
and the Current Regulators. It could sense the lowest dropout
voltage among used channels to Boost Driver in order to maintain
the output voltage in optimal level. An OVP circuit is built for
open-loop protection when any string becomes open.
The thermal protection function protects IC from over
temperature damage. Also, the exposed thermal pad enhances the
package power dissipation.
TYPICAL APPLICATION CIRCUIT
V
IN
=4.5V~25V
C
IN
L
D
F
H
IGH
V
OLTAGE
B
OOST
D
RIVER
W
ITH
6 C
HANNELS
C
ONSTANT
C
URRENT
R
EGULATORS
FEATURES
High frequency DC/DC converter for LEDs.
Integrated 40V power MOSFET.
4.5V ~ 25V wide input voltage range.
6 constant-current output channels.
Output current adjustable through external
resistor.
Constant output current range: 5mA~40mA.
40V output sustaining voltage for up to 10
pcs of LEDs in series.
Built OCP/OTP/OVP functions.
LED open/short protection.
Green Package.
APPLICATIONS
Automotive interior lighting
LED backlight driver for NB and Monitors.
PACKAGE PIN OUT
PWM
OUT1
16
15
V
OUT
SW
18
C
OUT
NC
20
19
17
PWM
PWM
OUT1
OUT2
SW
SHDN
NC
OUT3
GND
1
NC
OUT2
OUT3
GND
OUT4
OUT5
A706A
2
3
4
5
6
7
8
14
13
12
11
ON/OFF
SHDN
BYP
BYP
VIN
RT
C
BP
A706
VIN
RT
COMP
OUT6
OUT4
OUT5
9
10
ISET
OVP
SS
COMP
R
SET
R
P
C
SS
C
P1
SS
R
T
－
V
LED
＋
R
1
QFN – 4mm x 4mm – 20Pins
(Top View)
R
2
ORDER INFORMATION
K
Green Part
Copyright
©
2009 ADDtek Corp.
QFN 4mm x 4mm
20 pin
A706KGT-A
Note: The letter “G” is marked for Green parts, and letter “T” is marked for Tape & Reel.
1
DD088_B -- APRIL 2009
OUT6
ISET
OVP
ADDTEK [ ADDTEK CORP ]
