ADDtek A706 High voltage boost driver with 6 channels constant current regulator Datasheet

A706
HIGH VOLTAGE BOOST DRIVER WITH
6 CHANNELS CONSTANT CURRENT REGULATORS
www.addmtek.com
DESCRIPTION
FEATURES
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 VF 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, RSET, 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.
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.
TYPICAL APPLICATION CIRCUIT
PACKAGE PIN OUT
BYP
3
GND
VIN
4
VIN
OUT4
RT
5
RT
OUT5
SW
BYP
OUT6
COMP
SS
ISET
RT
A706
OVP
CBP
NC
SW
NC
OUT1
17
16
6
7
8
9
10
OUT6
OUT3
SHDN
18
COMP
2
OUT2
ON/OFF
OUT1
NC
PWM
1
19
A706A
SHDN
20
SS
PWM
ISET
COUT
DF
OVP
L
CIN
PWM
VOUT
VIN =4.5V~25V
15
OUT2
14
OUT3
13
GND
12
OUT4
11
OUT5
RSET
RP
CSS
-
V LED
+
CP1
R1
QFN – 4mm x 4mm – 20Pins
(Top View)
R2
ORDER INFORMATION
K
Green Part
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.
Copyright © 2009 ADDtek Corp.
1
DD088_B -- APRIL 2009
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