MP3394SGS-Z

MP3394S Step-Up, 4-String Max 200mA/String White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3394S is a step-up controller with 4 current channels. It’s designed to drive WLED arrays for large-size LCD-panel backlighting applications. The MP3394S is flexible, and can expand the number of LED channels with 1 or 2 MP3394S in parallel operating from a single inductive power source. • • • 4-String, Max 200mA/String WLED Driver 5V to 28V Input Voltage Range 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 Cascading Capability with a Single Power Source Under-Voltage Lockout Thermal Shutdown TSSOP16EP, SOIC16 and SOIC20 Packages • • • • • The MP3394S uses an architecture of current – mode and fixed operation frequency The frequency is programmable by an external frequency-setting resistor. MP3394S drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the programmed value set by an external currentsetting resistor. • • • APPLICATIONS • • • The MP3394S applies 4 internal current sources for current balance. 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. Desktop LCD Flat Panel Displays Flat Panel Video Displays 2D/3D 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. An external PWM input signal or DC input signal controls PWM dimming. In DC-input dimming mode, the dimming PWM signal can be generated internally and the dimming frequency is programmed by an external setting capacitor. TYPICAL APPLICATION VIN 5V to 28V D1 L1 CIN COUT MP3394S 15 VIN VCC CVCC 16 CCOMP RCOMP 1 COMP Enable 2 5 ROSC RBOSC GATE ISENSE DIMMING 7 OSC GND RSET BOSC LED1 LED2 3 6 13 EN OVP CBOSC M1 14 DBRT LED3 ISET LED4 R1 R2 RSENSE 4 12 11 10 9 8 MP3394S Rev. 1.03 www.MonolithicPower.com 3/21/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP3394S—4-STRING, MAX 200mA/STRING WHITE LED DRIVER ORDERING INFORMATION Part Number Package Top Marking MP3394SGF* MP3394SGS** MP3394SGY*** TSSOP16EP SOIC16 SOIC20 MP3394S MP3394S MP3394S *For Tape & Reel, add suffix –Z (eg. MP3394SGF–Z). **For Tape & Reel, add suffix –Z (eg. MP3394SGS–Z). ***For Tape & Reel, add suffix –Z (eg. MP3394SGY–Z). Contact Factory for TSSOP16EP Availability PACKAGE REFERENCE TOP VIEW TOP VIEW TOP VIEW COMP 1 16 VCC EN 2 15 VIN DBRT 3 14 GATE GND 4 13 OSC ISET BOSC LED4 5 Exposed Pad Connect to GND 6 12 11 7 10 8 9 ISENSE COMP 1 16 VCC EN 2 15 VIN DBRT 3 14 GATE GND 4 13 ISENSE OVP OSC 5 12 LED1 ISET 6 11 LED2 LED3 BOSC LED4 7 10 8 TSSOP16EP 9 OVP LED1 LED2 LED3 COMP 1 20 VCC EN 2 19 VIN DBRT 3 18 GATE NC 4 17 ISENSE 5 16 NC NC 6 15 NC OSC 7 14 OVP ISET 8 13 LED1 BOSC 9 12 LED2 LED4 10 11 LED3 GND SOIC16 SOIC20 (4) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................-0.3V to +30V VGATE ............................................-0.5V to +6.8V VCC .............................................-0.5V to +6.8V VLED1 to VLED4 ....................................-1V to +55V All Other Pins ...............................-0.3V to +6.3V (2) Continuous Power Dissipation (TA = 25°C) TSSOP16EP ........................................... 2.78 W SOIC16 ................................................... 1.56 W SOIC20 ……………………………………1.74W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature.............. -65 °C to +150°C TSSOP16EP ...........................45 ...... 10 ... °C/W SOIC16 ...................................80 ...... 35 ... °C/W SOIC20 ...................................72 ...... 30 ... °C/W Recommended Operating Conditions (3) Supply Voltage VIN.............................5V to 28V LED Current (Backlight) ...........10mA to 180mA Operating Junction Temp. (TJ). -40°C to +125°C 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. MP3394S Rev. 1.03 www.MonolithicPower.com 3/21/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP3394S—4-STRING, MAX 200mA/STRING WHITE LED DRIVER 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 5 VEN=5V, 0