A723 Datasheet, PDF (1/1 Pages) ADDtek Corp – HIGH VOLTAGE BOOST DRIVER WITH 8 CHANNELS CONSTANT CURRENT REGULATORS

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A723
HIGH VOLTAGE BOOST DRIVER WITH
8 CHANNELS CONSTANT CURRENT REGULATORS
DESCRIPTION
The A723 is a high voltage Boost driver with 8 channels
adjustable constant current regulators for LED backlight
applications. Eight 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 30mA
through an external resistor, R_SET, which gives users flexibility
in controlling the light intensity of LEDs. It also could adjust
LED brightness from 0% to 100% 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 output 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
L
CIN
V_OUT
DF
COUT
PWM
ON/OFF
CBP
RT
SHDN
BYP
VIN
RT
CVFB
A723
OUT4
GND
GND
OUT5
OUT6
－
V_LED
＋
FEATURES
High frequency DC/DC converter for LEDs.
Integrated 50V power MOSFET.
4.5V ~ 25V wide input voltage range.
8 constant-current output channels.
Output current adjustable through external resistor.
Constant output current range: 5mA~30mA.
45V current sinks breakdown voltage for up to 12
pcs of LEDs in series.
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 OUT4
BYP 2
14 GND
VIN 3
13 GND
RT ⁴
CVFB 5
12 OUT5
11 OUT6
6 7 8 9 10
RSET
CSS
RP
CP1
R1
QFN 4mm x 4mm
(Top View)
R2
ORDER INFORMATION
K
QFN 4mm x 4mm
20 pin
Green Part
A723KGT
Note: The letter “G” is marked for Green parts, and letter “T” is marked for Tape & Reel.
Copyright © 2009 ADDtek Corp.
1
V0.8 -- FEBRUARY 2009