A706 Datasheet, PDF (1/1 Pages) ADDtek Corp – HIGH VOLTAGE BOOST DRIVER WITH 6 CHANNELS CONSTANT CURRENT REGULATORS

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A706
HIGH VOLTAGE BOOST DRIVER WITH
6 CHANNELS CONSTANT CURRENT REGULATORS
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
V_OUT
CIN
L
DF
COUT
PWM
ON/OFF
CBP
RT
SHDN
BYP
VIN
RT
A706
OUT3
GND
OUT4
OUT5
RSET
CSS
RP
CP1
－
V_LED
＋
R1
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
20 19 18 17 16
SHDN ¹
15 _OUT2
NC ²
14 _OUT3
BYP ³
VIN ⁴
13 _GND
12 _OUT4
RT ⁵
11 _OUT5
6 7 8 9 10
QFN – 4mm x 4mm – 20Pins
(Top View)
R2
ORDER INFORMATION
K
QFN 4mm x 4mm
20 pin
Green Part
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