MP3385A 4-String, 80V Output, 2 WLED Controller with I C Interface The Future of Analog IC Technology DESCRIPTION FEATURES The MP3385A is a step-up controller with four 4-String, Max 300mA/String WLED Driver regulated current channels designed to drive 4.5V to 33V Input Voltage Range WLED arrays for mid- and large-sized LCD 80V ABS Rating for Each String panel backlighting applications. 1.8% Current Matching Accuracy for Each String The MP3385A uses peak-current mode and Unused Channel Auto-Detection Function PWM control architecture for system loop during Start-Up regulation. The MP3385A drives an external 100kHz-900kHz Programmable Switching MOSFET to boost up the output voltage from a Frequency 4.5V-to-33V input supply. 2 Multiple Dimming Modes Selected by I C 2 The MP3385A employs an I C digital interface Interface that can flexibly set operation and protection o Direct PWM Dimming Mode modes, including dimming mode, dimming o Internal Fixed 23kHz PWM Dimming current and dimming ratio, OCP, OVP, LED 2 Mode by I C short protection threshold, and switching o Analog Dimming Mode by Input Pulse frequency. For easy application use and board 2 o Internal Analog Dimming Mode by I C debugging, the MP3385A detects and disables o Mixed Dimming Mode by Input Pulse the unused LED strings automatically during 2 o Internal Mixed Dimming Mode by I C start-up to avoid charging the output to the OVP 2%-100% Programmable Full Scale Current threshold. with 8-Bit Resolution The MP3385A achieves 1.8% current matching 0%-100% LED Dimming Range with 10-Bit between each string. The low regulation voltage Resolution for Internal Dimming Mode on the LED current sources improves efficiency Cascading Capability with a Single Power and reduces power loss to achieve a higher Source current output. 18V to 80V Over-Voltage Protection (OVP), 2V/Step The MP3385A supports analog, PWM, and 0.15V to 0.5V Latch-Off/Recoverable Over- combined analog and PWM dimming modes to Current Protection (OCP) Threshold, meet different application requirements. Full 50mV/Step protection features include over-current Recoverable Thermal Shutdown Protection protection (OCP), over-temperature protection (OTP), under-voltage protection (UVP), over- APPLICATIONS voltage protection (OVP), LED short/open Desktop LCD Flat Panel Displays protection, and inductor/diode short protection. All-in-One PCs The MP3385A is available in a QFN-20 2D/3D LCD TVs (4mmx4mm) package. All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are registered trademarks of Monolithic Power Systems, Inc. MP3385A Rev. 1.01 www.MonolithicPower.com 1 8/29/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. 2 MP3385A 4-STRING WLED CONTROLLER WITH I C INTERFACE TYPICAL APPLICATION MP3385A Rev. 1.01 www.MonolithicPower.com 2 8/29/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved.