MP3384LGQ-P

MP3384L 50V, 4-String, White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3384L is a step-up converter to control up to 4 white LED strings for LCD backlighting.      The MP3384L employs a fixed-switching frequency that can be selected from either 625kHz or 1.25MHz. It takes a 3V-to-25V input supply: The low-end input voltage allows the MP3384L to power a tablet display from a single battery. Highly Efficient 3V-to-25V Input Voltage Range 50V Maximum Step-Up Voltage Balanced Driver for 4 WLED Strings 2.5% Current Matching Accuracy Between Strings Selectable Switching Frequency: 625kHz or 1.25MHz PWM Dimming Programmable Over-Voltage Protection Under-Voltage Lockout Open and Short LED Protection Thermal Shutdown 3mm×3mm 16-pin QFN Package  The MP3384L has 4 internal current sources to independently regulate the current in each LED string to a value set by an external, current-setting resistor. It achieves current balance within 2.5% regulation accuracy between strings. Its low 600mV regulation voltage for the LED current sources reduces power loss and improves efficiency.       The MP3384L features multiple protections, including under-voltage lockout, MOSFET current limiting, over-voltage protection, open/short LED protection, and thermal shut-down.      APPLICATIONS The MP3384L is available in a 3mm×3mm QFN-16 package. Notebook Computers Netbooks and Tablet Computers Digital Picture Frames Hand-Held Terminal Displays Automotive Systems All MPS parts are lead-free, halogen 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. TYPICAL APPLICATION D1 L1 VIN 3V - 25V C1 R1 C2 R2 C4 C3 16 15 VIN Enable 1 NC 2 3 RSET PWM DIMMING 4 14 VCC 13 COMP SW PGND EN OSC MP3384L NC ISET OVP GND LED4 PWM LED1 LED2 LED3 5 6 7 8 12 11 10 9 MP3384L Rev. 1.02 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP3384L – 50V, 4-STRING, WHITE LED DRIVER ORDERING INFORMATION Part Number* MP3384LGQ Package QFN-16 (3mm×3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP3384LGQ–Z) TOP MARKING AFZ: product code of MP3384LGQ Y: year code LLL: lot number PACKAGE REFERENCE MP3384L Rev. 1.02 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 2 MP3384L – 50V, 4-STRING, WHITE LED DRIVER ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................−0.3V to +30V VSW, VLED1 to VLED4........................... −1V to +50V All Other Pins ................................. −0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) ………………………………………………....2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature .............. −65°C to +150°C QFN-16 (3mm×3mm) ............ 60 ...... 12 ... °C/W Recommended Operating Conditions (3) Supply Voltage VIN .......................... +3V to +25V Max LED Current/String............................ 40mA Operating Junction Temp. (TJ). −40°C to +125°C (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-to-ambient 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. MP3384L Rev. 1.02 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP3384L – 50V, 4-STRING, WHITE LED DRIVER ELECTRICAL CHARACTERISTICS VIN =12V, VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Operating Input Voltage Supply Current (Quiescent) Supply Current (Shutdown) VIN IQ IST LDO Output Voltage VCC VCC High Threshold VCC Low Threshold EN ON Threshold EN OFF Threshold STEP-UP CONVERTER SW On-Resistance SW Leakage Current Switching Frequency OSC High-Level Threshold OSC Low-Level Threshold Minimum ON Time Maximum Duty Cycle SW Current Limit COMP Transconductance COMP Output Current PWM DIMMING PWM High-Level Threshold PWM Low-Level Threshold LED CURRENT REGULATION LEDx Average Current Current Matching VEN_ON VEN_OFF RDS_ON ISW_LK fSW VOSC_H VOSC_L τON_MIN DMAX ISW_LIMIT GCOMP ICOMP Condition ILED IDS=20mA VSW=45V VOSC=VCC or Floating VOSC=0V Units 25 2 V mA μA 5.5 V 3 V V V V 1.8 4.5 5 2.2 1.7 0.6 0.5 1.0 500 2.1 1.25 625 PWM Mode without Pulse Skipping Duty=90% ∆ICOMP=±10µA 90 1.2 100 93 1 1.5 750 96 100 60 1.5 RISET=60.4kΩ 19.4 20 ILED=20mA VLEDX Max 0.8 LEDx Regulation Voltage PROTECTION OVP Over Voltage Threshold VOVP_OV Rising Edge OVP UVLO Threshold VOVP_UV LEDx Over Voltage Threshold VLEDX_OV LEDx UVLO Threshold VLEDX_UV Thermal Shutdown Threshold LEDx Over-Voltage Fault Timer Typ 3 VIN=12V, VEN=5V, no load. VEN=0V, VIN=12V VEN=5V, 6V