PT6973 LED Driver for Backlighting with Dimming DESCRIPTION PT6973 is a boost DC/DC converter with one channel constant current regulator, which provides 10mA to 30mA current for up to 8 LEDs in series. The power supply is from 4V to 15V and the max output voltage is 28V. PT6973 provides both PWM dimming and analog dimming functions. The minimum PWM dimming on time is 125ns, which means 0.25% dimming duty-cycle at 20KHz is available. PT6973 also provides much protections, such as under voltage lockout, cycle by cycle input current limit, output over voltage protection, flywheel diode open protection, feedback over voltage protection, thermal shutdown protection and so on. PT6973 default operates at 600KHz. Furthermore, it can be synchronized by external clock for different frequency operation. FEATURES 4~15V Input Voltage 10mA~30mA LED Current with ±3% matching Drive Up to 8 LEDs 600kHz Switching Frequency Typical less than 1uA Standby Current 28V Output Over Voltage Protection LED Open/Short Protection Flywheel Diode Open Protection Output Short to GND Protection 20kHz 0.25% PWM Dimming Available External Clock Synchronize available DFN8 Package Digital Cameras Monitor Backlighting Cell Phones Monitor Backlighting PDAs, Handheld Computers Monitor Backlighting Small LCD Displays Backlighting APPLICATIONS BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan PT6973 TYPICAL APPLICATIONS ORDER INFORMATION Valid Part Number PT6973 Package Type 8 Pins, DFN (2mm*3mm) Top Code PT6973 PIN CONFIGURATION PIN DESCRIPTION Pin Name EN VIN PWM ISET FB OUT CLK SW GND V1.0 Description Enable control. Power supply pin. PWM dimming signal input. LED Current setting terminal, connect a resistor between ISET and GND for LED Current setting. Feedback Voltage input. Over Voltage Protection input. External Clock input. Switching terminal. Ground. 2 Pin No. 1 2 3 4 5 6 7 8 Exposed PAD August 2013 PT6973 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 7 August 2013