MP3391EF-LF

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 8channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications. • • • • • The MP3391 uses current mode, fixed frequency architecture. The switching frequency is programmable by an external frequency setting resistor. It drives an external MOSFET to boost up the output voltage from a 9V to 35V input supply. The MP3391 regulates the current in each LED string to the programmed value set by an external current setting resistor. The MP3391 applies 8 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss and improves efficiency. PWM dimming is implemented with external PWM input signal or DC input signal. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. MP3391 Rev. 1.12 9/22/2015 • • • • • • • • 9V to 35V Input Voltage Range 10V MOSFET Gate Driver Drive Selectable 8, 6 and 4 Strings of LEDs Maximum 120mA for Each String 2.5% Current Matching Accuracy Between Strings Programmable Switching Frequency PWM or DC Input Burst PWM Dimming Open/Short protection and Fault Flag Output Programmable Short Protection Voltage and Time Threshold Programmable Over-voltage Protection Flexible Extendable LED Channels Application Thermal Shutdown 28-pin TSSOP and 28-pin SOIC Package APPLICATIONS • • • Desktop LCD Flat Panel Displays Flat Panel Video Displays LCD TVs and Monitors All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER TYPICAL APPLICATION 9V~35V D1 L1 M2 VIN CIN String 1 String 8 COUT R1 2 FF 26 CVCC VCC 3 4 Enable 5 7 ROSC 9 8 DIMMING 6 VCC R2 FF GATE VCC 11 10 28 ISENSE COMP 25 M1 VDD 24 1 RSENSE CDD EN PGND OSC BOSC CBOSC CT 27 RFF CCOMP RCOMP RSET VFAULT VIN OVP MP3391 LED1 GND LED2 DBRT LED3 ISET LED4 TSET LED5 NC LED6 SSET LED7 NUMSEL LED8 23 22 13 14 15 16 17 18 R3 12 R4 21 19 20 RSEL MP3391 Rev. 1.12 9/22/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (TA) MP3391EF* TSSOP28 MP3391EF -20°C to +85°C MP3391EY** SOIC28 MP3391EY -20°C to +85°C *For Tape & Reel, add suffix –Z (eg. MP3391EF–Z). For RoHS compliant packaging, add suffix –LF (eg. MP3391EF–LF–Z) **For Tape & Reel, add suffix –Z (eg. MP3391EY–Z). For RoHS compliant packaging, add suffix –LF (eg. MP3391EY–LF–Z) PACKAGE REFERENCE TSSOP28 SOIC28 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .................................................-0.3V to +40V VFAULT ..............................................VIN-6V to VIN VGATE ...............................................-0.5V to 12V VLED1 to VLED8 ....................................-1V to +55V All Other Pins ...............................-0.3V to +6.3V (2) Continuous Power Dissipation (TA = +25°C) TSSOP28……………………………… ...3.9 W SOIC28………………………………… ...2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C TSSOP28 ................................32 ....... 6 .... °C/W SOIC28 ..................................60 ...... 30 ... °C/W Recommended Operating Conditions (3) Supply Voltage VIN ..............................9V to 35V LED Current (Backlight) ...........10mA to 120mA Maximum Junction Temp. (TJ) ................+125°C MP3391 Rev. 1.12 9/22/2015 (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operation conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 3 MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER ELECTRICAL CHARACTERISTICS VIN =18V, VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Operating Input Voltage Symbol VIN Condition Min 9 Supply Current (Quiescent) IQ VIN=18V, VEN=5V, no load no switching, RISET=20kΩ Supply Current (Shutdown) IST VEN=0V, VIN=18V VCC Output Voltage VCC VEN=5V, 0