MP3364 4-Channel, Maximum 150mA/Ch Boost WLED Driver 2 with 15000:1 Dimming Ratio and I C DESCRIPTION FEATURES The MP3364 is a step-up converter with four 3.5V to 36V Input Voltage Range channel current sources. The device is 4 Channels with Maximum 150mA per designed to drive white LED arrays as Channel backlighting for small- or medium-sized LCD Internal 100m, 50V MOSFET panels. Configurable f Up to 2.2MHz SW External Sync SW Function The device uses peak current mode as its PWM Multi-Dimming Operation Mode through control architecture to regulate the boost PWM Input, Including: converter. Four channel current sources are o Direct PWM Dimming applied to the LED cathode to adjust the LED o Analog Dimming brightness. The MP3364 regulates the current o Mixed Dimming with 25% or 12.5% in each LED string to the value set by an Transfer Point external current-setting resistor, with 2.5% 15000:1 Dimming Ratio during PWM current regulation accuracy between strings. Dimming when f 200Hz PWM A low on resistance MOSFET and headroom 200:1 Dimming Ratio during Analog voltage are provided to improve efficiency. The Dimming through PWM Dimming Signal 2 MP3364 has a standard I C digital interface for Input easy use. The switching frequency can be Excellent EMI Performance, Frequency 2 configured via a resistor, I C interface, or Spread Spectrum external clock. 2 I C Interface, 3 Selectable IC Addresses The MP3364 provides analog, PWM, and mixed Phase Shift Function for PWM Dimming dimming modes with a PWM input. The 2.5% Current Matching 2 dimming mode can be selected via the I C Cycle-by-Cycle Current Limiting interface or the MIX/AD pin. The device also Disconnect VOUT from VIN has a phase shift function to eliminate noise Optional: LED Current Can Automatically during PWM dimming. Decrease at Higher Temperatures Robust protections are included to guarantee LED Short/Open, OTP, OCP, and Inductor safe operation. Protections include over-current Short Protection protection (OCP), over-voltage protection Configurable LED Short Threshold (OVP), over-temperature protection (OTP), LED Configurable OVP Threshold short protection, and LED open protection. The Fault Indicator Signal Output MP3364 can automatically decrease the LED Available in a QFN-24 (4mmx4mm) current at higher temperatures. Package The MP3364 is available in a QFN-24 APPLICATIONS (4mmx4mm) package. Tablets Notebooks 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, the MPS logo, and Simple, Easy Solutions are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. MP3364 Rev. 1.0 MonolithicPower.com 1 4/7/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2021 MPS. All Rights Reserved. 2 MP3364 4-CHANNEL BOOST WLED DRIVER WITH HIGH DIMMING RATIO AND I C TYPICAL APPLICATION L1 D1 VIN VOUT C1 C2 GND C3 R2 R3 R6 24 23 22 21 20 19 R4 1 18 PWM DIM SW R5 2 17 MIX/AD PGND R1 3 16 FREQ/SYNC LED1 4 15 EN MP3364 EN LED2 5 14 SCL LED3 SCL/PSE 6 13 SDA/PSE LED4 SDA 7 8 9 10 11 12 R9 R8 R7 C4 VCC FF MP3364 Rev. 1.0 MonolithicPower.com 2 4/7/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2021 MPS. All Rights Reserved. COMP VIN SD FF ISET VCC ADR AGND STH AGND OVP AGND String 1 String 2 String 3 String 4