MP3393EF-LF-Z

MP3393 8-String Step-Up White LED Driver with External Transistor The Future of Analog IC Technology DESCRIPTION FEATURES The MP3393 is a step-up controller with 8 current channel sources designed to power WLED backlights for large LCD panels. • • • • • The MP3393 uses current-mode fixed-frequency architecture. It drives an external MOSFET to boost the output voltage. The switching frequency is programmable by an external setting resistor. The MP3393 integrates a constant-current control circuit to regulate the current in each LED string to the value set by an external current feedback resistor. Current matching can achieve 1.2% regulation accuracy between strings. Its low 202mV regulation voltage reduces power loss and improves efficiency. The MP3393 includes protections including under-voltage lockout, LED open/short protection, and thermal shutdown. The fault flag pin indicates the statuses of all fault signals. The MP3393 can be daisy-chained to expand the number of LED channels. It is available in TSSOP28EP and SOIC28 packages. MP3393 Rev. 1.05 3/26/2013 • • • • • • • • 9V-to-32V Input Voltage Range Drives 8 Channels of LED strings Internal Constant-Current Control Maximum Channel Current Over 350mA 1.2% Current Matching Accuracy Between Strings Programmable Switching Frequency Analog Dimming and External PWM Dimming Open and Short LED Protection Programmable Over-Voltage Protection Fault Output Flag Thermal Shutdown Extendable LED Channels that Share One Power Stage Set TSSOP28EP and SOIC28 Packages APPLICATIONS • • 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. © 2013 MPS. All Rights Reserved. 1 MP3393—8-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER TYPICAL APPLICATION D1 L1 8 WLED Strings VIN CIN COUT R1 1 CVCC 23 CCOMP RCOMP ROSC Enable DIM VFAULT 28 R2 RFF 2 FF VIN 3 4 5 6 22 21 20 19 18 17 16 GATE VCC FF ISENSE GND COMP OVP OSC CTL1 EN DIM FB8 CTL8 FB7 CTL7 FB6 CTL6 FB5 MP3393 FB1 CTL2 FB2 CTL3 FB3 CTL4 FB4 CTL5 27 M1 26 25 RSENSE 24 8 7 RS1 10 9 RS2 12 11 RS3 14 13 RS4 15 RS2 RS3 RS4 MP3393 Rev. 1.05 3/26/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP3393—8-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER ORDERING INFORMATION Part Number MP3393EF MP3393EY Package TSSOP28EP SOIC28 Top Marking MP3393 MP3393 *For Tape & Reel, add suffix –Z (eg. MP3393EF–Z). For RoHS, compliant packaging, add suffix –LF (e.g. MP3393EF–LF–Z). **For Tape & Reel, add suffix –Z (eg. MP3393EY–Z). For RoHS, compliant packaging, add suffix –LF (e.g. MP3393EY–LF–Z). PACKAGE REFERENCE TOP VIEW VIN 1 28 VFAULT VCC 2 27 GATE COMP 3 26 ISENSE OSC 4 25 GND EN 5 24 OVP DIM 6 23 FF FB1 7 22 FB8 CTL1 8 21 CTL8 Exposed Pad Connect to GND FB2 9 20 FB7 CTL2 10 19 CTL7 FB3 11 18 FB6 CTL3 12 17 CTL6 FB4 13 16 FB5 CTL4 14 15 CTL5 TSSOP28EP SOIC28 ABSOLUTE MAXIMUM RATINGS (1) VIN，VFAULT ........................................-0.3V to 35V VGATE ...............................................-0.5V to 13V VCC ..................................................-0.5V to 13V VCTL1 to VCTL8 ................................................ 58V All Other Pins ...............................-0.3V to +6.3V (2) Continuous Power Dissipation (TA = +25°C) TSSOP28EP………………………………...3.9 W SOIC28………………………………………2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions (3) Supply Voltage VIN ..............................9V to 32V LED Current (Backlight) ...........50mA to 300mA Operating Junction Temp (TJ).. -40°C to +125°C MP3393 Rev. 1.05 3/26/2013 Thermal Resistance (4) θJA θJC TSSOP28EP ...........................32 ....... 6 .... °C/W 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. 3 MP3393—8-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER ELECTRICAL CHARACTERISTICS VIN =12V, VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Operating Input Voltage Condition VIN Supply Current (Quiescent) IQ Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC VIN_UVLO Typ 9 VIN=12V, VEN=5V, no load with switching Input UVLO Threshold Min VEN=5V, 11V