MP3388SGR-Z

MP3388S 55V, 8-String, Step-Up, White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3388S is a step-up converter with 8 current-source channels designed to drive arrays of white LED for LCD-panel backlighting applications.       The MP3388S uses current-mode, fixed-frequency architecture, and users can select a switching frequency of either 625kHz or 1.25MHz. It generates an output voltage up to 55V from a 4.3V-to-25V input supply. The MP3388S independently regulates the current in each LED string set by an external current setting resistor to a user-programmed value. High Efficiency Compact Size 4.3V-to-25V Input Voltage Range 55V Maximum Step-Up Voltage Balanced Driver for 8 WLED Strings 2.5% Current-Matching Accuracy between Strings Selectable Switching Frequency of 625kHz or 1.25MHz PWM or DC Input-Burst PWM Dimming Programmable Over-Voltage Protection Under-Voltage Lockout Open- and Short-LED Protection Thermal Shutdown Small QFN24 (4mm × 4mm) Package        The MP3388S applies an internal current source to each LED string terminal, and can achieve a current balance of 2.5% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. APPLICATIONS      The MP3388S features external PWM dimming or DC-input PWM dimming, which allows for flexible backlight luminance control. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. Notebook PCs Tablet Computers Small LCD TV Handheld Terminal Displays Automotive Electronics Equipments 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. TYPICAL APPLICATION M1 VIN 4.5V-25V VOUT D1 L1 C1 R1 C2 R2 C4 C3 VCC Enable NC EN PGND1 OSC PGND2 FPWM C5 PWM DIMMING C6 VIN COMPVFAULTSW1 SW2 OVP MP3388S PWMO LED1 GND LED2 PWMI LED3 LED8 LED7 LED6 LED5 ISET LED4 RSET MP3388S Rev.1.02 www.MonolithicPower.com 9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 1 MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER ORDERING INFORMATION Part Number Package QFN24 (4x4mm) MP3388SGR* Top Marking M3388S * For Tape & Reel, add suffix –Z (e.g. MP3388SGR–Z). PACKAGE REFERENCE EN 1 OSC 2 VCC VIN COMP VFAULT SW1 SW2 TOP VIEW 24 23 22 21 20 19 18 PGND1 17 PGND2 Exposed Pad Connect to GND GND 5 14 LED2 PWMI 6 13 LED3 7 8 9 10 11 12 LED4 15 LED1 ISET 4 LED5 PWMO LED6 16 OVP LED7 3 LED8 FPWM ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .................................................-0.3V to +30V VVFAULT ........................................... VIN –6V to VIN VSW, VLED1 to VLED8............................-1V to +55V All Other Pins ..................................-0.3V to +6V Continuous Power Dissipation ... (TA = +25°C) (2) QFN24(4mm×4mm) ................................... 2.9W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature ............... -65°C to +150°C QFN24 (4 x 4mm) ................. 42 ....... 9 .... °C/W Recommended Operating Conditions (3) Supply Voltage VIN ........................... 4.3V to 25V 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. MP3388S Rev.1.02 www.MonolithicPower.com 9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 2 MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER ELECTRICAL CHARACTERISTICS VIN =12V, VEN = 5V, TA = +25°C, unless otherwise noted. Parameters Symbol Condition Operating Input Voltage VIN Supply Current (Quiescent) IQ VIN=12V, VEN=5V, no load. Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC Input UVLO Threshold VIN_UVLO Min 4.3 VEN=5V, 6V