MP3389EF-LF

MP3389 12–String, Step-up White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3389 is a step-up controller with 12channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications. • • • • • The MP3389 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 5V to 28V input supply. The MP3389 regulates the current in each LED string to the programmed value set by an external current setting resistor. • • • • • • • The MP3389 applies 12 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low 550mV regulation voltage on LED current sources reduces power loss and improves efficiency. High Efficiency and Small Size 5V to 28V Input Voltage Range Balanced Driver for 12 Strings of WLEDs Maximum 60mA for Each String 2.5% Current Matching Accuracy Between Strings Programmable Switching Frequency PWM or DC Input Burst PWM Dimming Open and Short LED protection Programmable Over-voltage Protection Under Voltage Lockout 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. 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. TYPICAL APPLICATION M1 D1 L1 VIN 5V~28V CIN COUT R1 2 CVCC C COMP RCOMP Enable 4 8 R OSC 1 10 RBOSC 7 6 RSET 9 11 12 13 14 MP3389 Rev. 1.04 3/27/2013 VCC COMP GATE ISENSE EN NC OSC PGND NC BOSC C BOSC DIMMING VFAULT 27 R2 3 5 VCC VIN OVP MP3389 LED1 GND LED2 DBRT LED3 ISET LED4 LED12 LED5 LED11 LED6 LED10 LED7 LED9 LED8 26 M2 24 28 RSENSE 25 23 22 21 20 19 18 17 16 15 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP3389—12-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER ORDERING INFORMATION Part Number* Package Top Marking MP3389EF MP3389EY TSSOP28 SOIC28 3389EF 3389EY *For Tape & Reel, add suffix –Z (eg. MP3389EF–Z). For RoHS compliant packaging, add suffix –LF (eg. MP3389EF–LF–Z) **For Tape & Reel, add suffix –Z (eg. MP3389EY–Z). For RoHS compliant packaging, add suffix –LF (eg. MP3389EY–LF–Z) PACKAGE REFERENCE TOP VIEW TSSOP28 NC 1 28 NC VIN 2 27 VFAULT VCC 3 26 GATE COMP 4 25 PGND EN 5 24 ISENSE DBRT 6 23 OVP GND 7 22 LED1 OSC 8 21 LED2 ISET 9 20 LED3 BOSC 10 19 LED4 LED12 11 18 LED5 LED11 12 17 LED6 LED10 13 16 LED7 LED9 14 15 LED8 SOIC28 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .................................................-0.3V to +30V VVFAULT ........................................... VIN - 6V to VIN VGATE ..............................................-0.5V to 6.3V VLED1 to VLED12 ..................................-1V to +50V All Other Pins ...............................-0.3V to +6.3V (2) Continuous Power Dissipation (TA = +25°C) TSSOP28……………………………… ...3.9W SOIC28………………………………… ...2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C TSSOP28 ................................32 ....... 6 .... °C/W Recommended Operating Conditions (3) Supply Voltage VIN ..............................5V to 28V LED Current (Backlight) .............10mA to 60mA Operating Junction Temp. (TJ). -40°C to +125°C MP3389 Rev. 1.04 3/27/2013 (4) θJA θJC SOIC28 ..................................60 ...... 30 ... °C/W 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. © 2013 MPS. All Rights Reserved. 2 MP3389—12-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER ELECTRICAL CHARACTERISTICS VIN =12V, VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Condition Min Operating Input Voltage VIN Supply Current (Quiescent) IQ VIN=12V, VEN=5V, no load with switching Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC Input UVLO Threshold VIN_UVLO Typ 4.5 VEN=5V, 0