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