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 High Efficiency current-source channels designed to drive arrays Compact Size of white LED for LCD-panel backlighting 4.3V-to-25V Input Voltage Range applications. 55V Maximum Step-Up Voltage Balanced Driver for 8 WLED Strings The MP3388S uses current-mode, 2.5% Current-Matching Accuracy between fixed-frequency architecture, and users can select Strings a switching frequency of either 625kHz or Selectable Switching Frequency of 625kHz 1.25MHz. It generates an output voltage up to 55V from a 4.3V-to-25V input supply. The or 1.25MHz MP3388S independently regulates the current in PWM or DC Input-Burst PWM Dimming each LED string set by an external current setting Programmable Over-Voltage Protection resistor to a user-programmed value. Under-Voltage Lockout Open- and Short-LED Protection The MP3388S applies an internal current source Thermal Shutdown to each LED string terminal, and can achieve a Small QFN24 (4mm 4mm) Package current balance of 2.5% regulation accuracy between strings. Its low 600mV regulation voltage APPLICATIONS on LED current sources reduces power loss and Notebook PCs improves efficiency. Tablet Computers The MP3388S features external PWM dimming or Small LCD TV DC-input PWM dimming, which allows for flexible Handheld Terminal Displays backlight luminance control. The dimming PWM Automotive Electronics Equipments signal can be generated internally, and the dimming frequency is programmed by an external 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 setting capacitor. Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION M1 D1 V L1 OUT VIN C1 C2 4.5V-25V R1 R2 C3 C4 VCC VIN COMPVFAULTSW1 SW2 EN PGND1 Enable OSC PGND2 NC FPWM OVP MP3388S LED1 PWMO C5 C6 GND LED2 PWM PWMI LED3 DIMMING LED8 LED7 LED6 LED5 ISET LED4 R SET MP3388S Rev.1.02 www.MonolithicPower.com 1 9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2016 MPS. All Rights Reserved. MP3388S55V, 8-STRING, STEP-UP, WHITE LED DRIVER ORDERING INFORMATION Part Number Package Top Marking QFN24 (4x4mm) MP3388SGR* M3388S * For Tape & Reel, add suffix Z (e.g. MP3388SGRZ). PACKAGE REFERENCE TOP VIEW 24 23 22 21 20 19 1 18 EN PGND1 2 17 OSC PGND2 Exposed Pad 3 16 FPWM OVP Connect to GND 4 15 PWMO LED1 5 14 GND LED2 PWMI 6 13 LED3 7 8 9 10 11 12 (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC V ................................................. -0.3V to +30V QFN24 (4 x 4mm) ................. 42 ....... 9 .... C/W IN V ........................................... V 6V to V VFAULT IN IN Notes: V , V to V ............................ -1V to +55V SW LED1 LED8 1) Exceeding these ratings may damage the device. All Other Pins .................................. -0.3V to +6V 2) The maximum allowable power dissipation is a function of the (2) maximum junction temperature TJ(MAX), the Continuous Power Dissipation ... (T = +25C) A junction-to-ambient thermal resistance JA, and the ambient QFN24(4mm4mm) ................................... 2.9W temperature TA. The maximum allowable continuous power Junction Temperature ............................... 150C dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)-TA)/ JA. Exceeding the maximum Lead Temperature .................................... 260C allowable power dissipation will cause excessive die Storage Temperature ............... -65C to +150C temperature, and the regulator will go into thermal shutdown. (3) Internal thermal shutdown circuitry protects the device from Recommended Operating Conditions permanent damage. 3) The device is not guaranteed to function outside of its Supply Voltage V ........................... 4.3V to 25V IN operation conditions. Operating Junction Temp. (T ). -40C to +125C J 4) Measured on JESD51-7, 4-layer PCB. MP3388S Rev.1.02 www.MonolithicPower.com 2 9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2016 MPS. All Rights Reserved. LED8 VCC LED7 VIN LED6 COMP LED5 VFAULT SW1 ISET LED4 SW2