MP3386 50V, 6 String White LED Driver The Future of Analog IC Technology FEATURES DESCRIPTION High Efficiency and Small Size The MP3386 is a step-up converter with 6- 4.5V to 25V Input Voltage Range channel current sources designed for driving the 50V Maximum Step-up Voltage white LED arrays for large size LCD panel Balanced Driver for 6 Strings of WLED backlighting applications. 3% Current Matching Accuracy Between The MP3386 uses current mode, fixed frequency Strings architecture. The switching frequency can be Selectable Switching Frequency: 1.25MHz or selected at 1.25MHz or 625kHz. It generates an 625kHz output voltage up to 50V from a 4.5V to 25V input PWM or DC Input Burst PWM Dimming supply. The MP3386 regulates the current in each Programmable Over-voltage Protection LED string to the user programmed value set by an Threshold external current setting resistor. Under Voltage Lockout The MP3386 applies 6 internal current sources in Open and Short LED Protection each LED string terminal to get current balance. Thermal Shutdown And the current matching achieves 3% regulation Small QFN24 (4x4mm) and 28-pin SOIC accuracy between strings. Its low 600mV Package regulation voltage on LED current sources reduces power loss and improves efficiency. APPLICATIONS Notebook & Netbook PC The MP3386 features external PWM dimming or Small LCD TV DC input PWM dimming, which allows the flexible control of the backlighting luminance under wide Handy Terminals Display range of the ambient brightness, and also avoids Automotive System and Tablet Computer the possibility of PWM dimming audible noise. The All MPS parts are lead-free and adhere to the RoHS directive. For MPS green dimming PWM signal can be generated internally, status, please visit MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are Registered Trademarks and the dimming frequency is programmed by an of Monolithic Power Systems, Inc. external setting capacitor. TYPICAL APPLICATION M1 D1 L1 VIN C1 C2 4.5V~25V R1 R2 C4 C3 24 23 22 21 20 19 VCC VIN COMP VFAULT SW1 SW2 1 18 EN PGND1 Enable 2 17 OSC PGND2 NC 3 16 FSET OVP MP3386 4 15 PWMO VOUT C5 C6 5 14 GND NC PWM 6 13 PWMI LED1 DIMMING LED6 LED5 LED4 LED3 ISET LED2 7 8 9 10 11 12 RSET MP3386 Rev. 1.0 www.MonolithicPower.com 1 1/19/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. MP3386- 50V, 6 STRINGS WHITE LED DRIVERS ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (T ) A QFN24 (4x4mm) MP3386DR* 3386DR -40 C to +85C SOIC28 MP3386EY** 3386EY -20 C TO +85C * For Tape & Reel, add suffix Z (e.g. MP3386DRZ). For RoHS Compliant Packaging, add suffix LF (e.g. MP3386DRLFZ) * * For Tape & Reel, add suffix Z (e.g. MP3386EYZ). For RoHS Compliant Packaging, add suffix LF (e.g. MP3386EYLFZ) PACKAGE REFERENCE TOP VIEW TOP VIEW VFAULT 1 28 SW1 COMP 2 27 24 23 22 21 20 19 VIN 3 26 VCC 1 18 4 25 EN PGND1 EN 5 24 2 17 OSC PGND2 OSC 6 23 3 16 FSET OVP FSET 7 22 OVP 4 PWMO 15 VOUT PWMO VOUT 8 21 GND 5 14 NC AGND NC 9 20 PWM1 6 13 LED1 10 19 LED1 PWMI LED2 LED6 11 18 789 11 12 10 NC LED5 12 17 ISET LED4 13 16 EXPOSED PAD NC CONNECT TO GND LED3 14 15 QFN24 (4x4mm) SOIC28 (4) Thermal Resistance JA JC (1) ABSOLUTE MAXIMUM RATINGS QFN24 (4x4mm) ....................42 ....... 9.... C/W V .................................................-0.3V to +30V IN SOIC28 ..................................60 ......30... C/W V ...........................................V - 6V to V VFAULT IN IN Notes: V , V , V to V ..................-1V to +50V SW OUT LED1 LED6 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 T(MAX), the junction-to- Continuous Power Dissipation (T = +25C) J A ambient thermal resistance , and the ambient temperature JA QFN24 (4x4mm).2.9W T . The maximum allowable continuous power dissipation at A SOIC28 .....2.1W any ambient temperature is calculated by PD(MAX)=(T (MAX)-T )/ . Exceeding the maximum J A JA Junction Temperature...............................150C allowable power dissipation will cause excessive die Lead Temperature ....................................260C temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from Storage Temperature............... -65C to +150 C permanent damage. (3) 3) The device is not guaranteed to function outside of its Recommended Operating Conditions operation conditions. 4 Measured on JESD51-7, 4-layer PCB.. Supply Voltage V ...........................4.5V to 25V IN Maximum Junction Temp. (T ) .............. +125C J MP3386 Rev. 1.0 www.MonolithicPower.com 2 1/19/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. NC SW2 NC PGND1 PGND2 LED6 VCC LED5 VIN LED4 COMP LED3 VFAULT ISET SW1 SW2 LED2