MP3385 4-String, 80V Output 2 WLED Controller with I C Interface The Future of Analog IC Technology DESCRIPTION FEATURES The MP3385 is a step-up controller with 4 4-String, Max 300mA/String WLED Driver regulated current channels designed to drive 4.5V to 33V Input Voltage Range WLED arrays for middle and large-size LCD 80V Abs. Rating for Each String panel backlighting applications. 1.8% Current Matching Accuracy for Each String The MP3385 uses peak current mode, PWM Unused Channel Auto-Detection Function control architecture for system loop regulation. during Start-Up It drives an external MOSFET to boost up the 100kHz-900kHz Programmable Switching output voltage from a 4.5V to 33V input supply. Frequency 2 It employs an I C digital interface and can 2 Multiple Dimming Modes Selected by I C flexibly set the operation and protection modes, Interface: including dimming mode, dimming current and 1. Direct PWM Dimming Mode dimming ratio, OCP, OVP, LED short protection 2. Internal Fixed 23kHz PWM Dimming threshold, and the switching frequency. For Mode easy application use and board debugging, the 3. Analog Dimming Mode by Input Pulse MP3385 detects and automatically disables the 4. Internal Analog Dimming Mode unused LED strings during start-up to avoid 5. Mixed Dimming Mode by Input Pulse charging the output to the OVP threshold. 6. Internal Mixed Dimming Mode The MP3385 achieves 1.8% current matching 2%-100% Programmable Full Scale Current between each string. The low regulation voltage with 8-Bit Resolution on the LED current sources improves efficiency 0%-100% LED Dimming Range with 10-Bit and reduces power loss in order to achieve a Resolution for Internal Dimming Mode higher current output. Cascading Capability with a Single Power Source The MP3385 supports analog, PWM, and 18V to 80V Over-Voltage Protection, combined analog and PWM dimming modes to 2V/Step meet different application requirements. Full 0.15V to 0.5V Latch-Off/Recoverable OCP protection features include OCP, OTP, UVP, Protection Threshold, 50mV/Step OVP, LED short/open protection, and Recoverable Thermal Shutdown Protection inductor/diode short protection. The MP3385 is available in a QNF-20 APPLICATIONS (4mm x 4mm) and a TSSOP20-EP package. Desktop LCD Flat Panel Displays All-in-One 2D/3D LCD TV 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. MP3385 Rev. 1.02 www.MonolithicPower.com 1 8/29/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. 2 MP3385 4-STRING WLED CONTROLLER WITH I C INTERFACE TYPICAL APPLICATION MP3385 Rev. 1.02 www.MonolithicPower.com 2 8/29/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved.