MP2162GQH-P

MP3388 50V, 8-String White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3388 is a step-up converter with 8-channel current sources designed for driving the white LED arrays for large size LCD panel backlighting applications. • • • • • The MP3388 uses current mode, fixed frequency architecture. The switching frequency can be selected at 1.25MHz or 625kHz. It generates an output voltage up to 50V from a 4.5V to 25V input supply. The MP3388 independently regulates the current in each LED string to the user programmed value set by an external current setting resistor. High Efficiency and Small Size 4.5V to 25V Input Voltage Range 50V Maximum Step-up Voltage Balanced Driver for 8 Strings of WLED 3% Current Matching Accuracy Between Strings Selectable Switching Frequency: 1.25MHz or 625kHz PWM or DC Input Burst PWM Dimming Programmable Over-voltage Protection Under Voltage Lockout Open and Short LED protection Thermal Shutdown Small QFN24 (4x4mm) and 28 pin SOIC packages Halogens Free • • • • • • • The MP3388 applies 8 internal current sources in each LED string terminal to achieve a current balance of 3% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. • APPLICATIONS The MP3388 features external PWM dimming or DC input PWM dimming, which allows the flexible control of the backlighting luminance. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. • • • • Notebook PC Small LCD TV Handy Terminals Display Automotive System and Tablet Computer 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 D1 L1 VIN C1 4.5V~25V R1 C2 R2 C4 C3 24 VCC Enable 1 NC 2 3 4 C5 22 VIN 21 COMP VFAULT 20 SW1 19 SW2 EN PGND1 OSC PGND2 FSET OVP MP3388 PWMO LED1 GND LED2 18 17 16 15 C6 5 PWM DIMMING 23 6 PWMI LED3 LED8 LED7 LED6 LED5 ISET 7 8 9 10 11 14 13 LED4 12 R SET MP3388 Rev. 1.0 12/16/2011 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 1 MP3388- 50V, 8-STRING WHITE LED DRIVERS ORDERING INFORMATION Part Number Top Marking Free Air Temperature (TA) MP3388DR* Package QFN24 (4x4mm) 3388DR -40°C TO +85°C MP3388EY SOIC28 MP3388EY -20°C TO +85°C * For Tape & Reel, add suffix –Z (e.g. MP3388DR–Z). For RoHS Compliant Packaging, add suffix –LF (e.g. MP3388DR–LF–Z) PACKAGE REFERENCE TOP VIEW VCC VIN COMP VFAULT SW1 SW2 TOP VIEW 24 23 22 21 20 19 EN 1 18 PGND1 OSC 2 17 PGND2 FSET 3 16 OVP PWMO 4 GND PWMI Exposed Pad Connect to GND 13 LED3 7 8 9 10 28 SW1 2 27 NC VIN 3 26 SW2 VCC 4 25 NC EN 5 24 PGND1 OSC 6 23 PGND2 FSET 7 22 OVP PWMO 8 21 LED1 GND 9 20 LED2 PWMI 10 19 LED3 LED8 11 18 LED4 LED7 12 17 NC 11 12 LED6 13 16 ISET LED4 6 1 COMP ISET LED2 LED5 14 LED6 5 LED7 LED1 LED8 15 VFAULT LED5 14 15 NC QFN24 (4X4mm) SOIC28 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .................................................-0.3V to +30V VVFAULT ........................................... VIN - 6V to VIN VSW ................................................-0.3V to +50V VLED1 to VLED8 .................................-0.3V to +50V All Other Pins ..................................-0.3V to +6V Continuous Power Dissipation (TA = +25°C) (2) QFN24 (4x4mm)………………………….....2.9W SOIC28…………………………… ……....2.1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C QFN24 (4x4mm) ...................42 ....... 9 .... °C/W SOIC28 .................................60 ...... 30 ... °C/W Recommended Operating Conditions (3) Supply Voltage VIN ...........................4.5V to 25V Maximum Junction Temp. (TJ) ..................125°C MP3388 Rev. 1.0 12/16/2011 (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. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 MP3388- 50V, 8-STRING WHITE LED DRIVERS 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 Typ 4.5 VEN=5V, 6V