MP3391 8-Channel, 120mA/ch Step-Up WLED Driver Controller The Future of Analog IC Technology DESCRIPTION FEATURES The MP3391 is a step-up controller with 8- 9V to 35V Input Voltage Range channel current sources designed for driving 10V MOSFET Gate Driver the WLED arrays for large size LCD panel Drive Selectable 8, 6 and 4 Strings of LEDs backlighting applications. Maximum 120mA for Each String 2.5% Current Matching Accuracy Between The MP3391 uses current mode, fixed Strings frequency architecture. The switching frequency Programmable Switching Frequency is programmable by an external frequency setting resistor. It drives an external MOSFET PWM or DC Input Burst PWM Dimming to boost up the output voltage from a 9V to 35V Open/Short protection and Fault Flag input supply. The MP3391 regulates the current Output in each LED string to the programmed value set Programmable Short Protection Voltage and by an external current setting resistor. Time Threshold Programmable Over-voltage Protection The MP3391 applies 8 internal current sources Flexible Extendable LED Channels for current balance. And the current matching Application can achieve 2.5% regulation accuracy between Thermal Shutdown strings. Its low regulation voltage on LED 28-pin TSSOP and 28-pin SOIC Package current sources reduces power loss and improves efficiency. APPLICATIONS PWM dimming is implemented with external Desktop LCD Flat Panel Displays PWM input signal or DC input signal. The Flat Panel Video Displays dimming PWM signal can be generated LCD TVs and Monitors internally, and the dimming frequency is All MPS parts are lead-free and adhere to the RoHS directive. For MPS green programmed by an external setting capacitor. status, please visit MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. MP3391 Rev. 1.12 www.MonolithicPower.com 1 9/22/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2015 MPS. All Rights Reserved. MP33918-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER TYPICAL APPLICATION D1 L1 String 1 String 8 M2 VIN CIN COUT 9V~35V R1 27 2 VIN VFAULT R2 FF 26 25 M1 FF GATE RFF CVCC VCC 3 24 VCC ISENSE CCOMP RCOMP RSENSE 4 1 COMP VDD CDD 5 23 EN Enable PGND 7 22 OSC OVP ROSC 9 13 BOSC LED1 CBOSC MP3391 8 14 GND LED2 6 15 DBRT LED3 DIMMING RSET 11 16 ISET LED4 CT 10 17 TSET LED5 VCC 28 18 NC LED6 R3 12 19 SSET LED7 R4 21 20 LED8 NUMSEL RSEL MP3391 Rev. 1.12 www.MonolithicPower.com 2 9/22/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2015 MPS. All Rights Reserved.