EV3371-R-00A

EV3371-R-00A 8-Channel, Synchronous Boost WLED Driver with I2C Interface DESCRIPTION FEATURES The EV3371-R-00A is an evaluation board designed for the MP3371, a synchronous boost converter with eight current channels designed to drive WLED arrays for LCD panels in tablets and notebook backlighting applications.  8 Channels with Maximum 50mA/Channel  Synchronous Converter with 50V LS-FET /HS-FET with 155m/235mΩ On Resistance  3V to 30V Input Voltage Range  470mV LED Regulation Voltage at 20mA  Max 2.5% Current Matching  350kHz, 500kHz, 650kHz, 800kHz, 950kHz, or 1.2MHz Selectable Switching Frequency  A1 Pins for Two I2C Addresses  0mA to 50mA Full-Scale LED Current, 8-Bit, 0.196mA/Step  Selectable Sync or Non-Sync Mode  Multi-Dimming Operation Mode Including: o Analog Dimming through External PWM Input or I2C Interface, 10-Bit Resolution o PWM Dimming through External PWM Input or I2C Interface, 14-Bit Resolution o Mixed Dimming Mode through External PWM Input or I2C Interface with 6.25%, 12.5%, 25%, or 50% Transfer Point, 14Bit PWM Duty Resolution  Linear Smooth Dimming with 2µs, 4µs, 8µs, 16µs, 32µs, 64µs, or 128µs Step-Slope Set  LED Short/Open, OTP, OCP, Inductor or Diode Short Protection  2.5V, 5V, 7.5V, or 10V LED Short Threshold  24V, 31V, 37.5V, or 45V OVP Threshold  1.8A or 2.5A Current Limit  Cascade Function to Share Power Stage  Available in a QFN-24 (4mmx4mm) Package The MP3371 uses peak current mode and pulse-width modulation (PWM) control to regulate the boost converter. The MP3371 employs a standard I2C digital interface to set the operation mode, switching frequency, fullscale current for each channel, sync or nonsync mode, dimming mode and duty, and various protection thresholds. The MP3371 features high efficiency due to low-headroom voltage for LED regulation and a small on resistance of the switching MOSFET. The synchronous rectifier saves PCB size and total BOM cost. The MP3371 is available (4mmx4mm) package. in a QFN-24 ELECTRICAL SPECIFICATIONS Parameter Input voltage Output voltage Symbol Value Units VIN 3 to 30 V VLED 1.5V) signal. 4. Connect the SCL, SDA, and GND pins of the evaluation board to their respective locations on the I2C interface via the configurable kit (EVKT USBI2C-02). 5. If working in external dimming mode, add a PWM input signal to the PWM terminal on the evaluation board. If working in internal dimming mode, leave the PWM pin floating or pull it to GND. POWER-ON SEQUENCE 1. VIN powers on. 2. EN powers on. 3. Set the register via the I2C interface (see Figure 1). 4. The PWM signal and LED string(s) should turn on. Program the PWM duty cycle to dim the LED current. Figure 1: MP3371 GUI Interface EV3371-R-00A Rev. 1.0 MonolithicPower.com 4/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 3 EV3371-R-00A – 8-CHANNEL, I2C, SYNC, 50V, BOOST WLED DRIVER EVAL BOARD EVALUATION BOARD SCHEMATIC EV3371-R-00A Rev. 1.0 MonolithicPower.com 4/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 4 EV3371-R-00A – 8-CHANNEL, I2C, SYNC, 50V, BOOST WLED DRIVER EVAL BOARD EV3371-R-00A BILL OF MATERIALS Qty 1 1 Ref F1 MP1 Value 0Ω NC 3 C1, C6, C7 4.7uF 2 C2, C10 470nF 1 C4 100nF 1 C3 NC 3 C5, C8, C11 NC 1 C9 NC 1 1 1 2 1 2 1 2 1 D1 D2 L1 R1, R2 R4 R6, R8 R9 R5, R7 JP1 1 U1 Description Fuse or resistor PMOS Ceramic capacitor, 50V, X7R Ceramic capacitor, 16V, X7R Ceramic capacitor, 16V, X7R Ceramic capacitor, 50V Ceramic capacitor, 50V Ceramic capacitor, 50V B160 Package 1206 SOIC-8 Manufacturer muRata Manufacturer P/N RC1206JR-070RL 1210 muRata GRM32ER71H475KA88L 0603 muRata GRM188R71C474KA88D 0603 muRata GRM188R71C104KA01D KENJET Yageo Yageo Yageo Yageo KJH8D43-100N RC0603FR-072KL RC0603FR-0720RL RC0603FR-070RL RC0603FR-07270RL MPS MP3371GR 0603 0603 0402 NC SMA NC SMA 10uH Inductor, 36mΩ, 3.2A SMD 2kΩ Resistor, 2kΩ, 1% 0603 20Ω Resistor, 20Ω, 1% 0603 0Ω Resistor, 0Ω, 1% 0603 270Ω Resistor, 270Ω, 1% 0603 NC Resistor 0603 Connector 2.54mm, 180° LED driver with I2C QFN-24 MP3371 interface (4mmx4mm) EV3371-R-00A Rev. 1.0 MonolithicPower.com 4/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 5 EV3371-R-00A – 8-CHANNEL, I2C, SYNC, 50V, BOOST WLED DRIVER EVAL BOARD PCB LAYOUT Figure 1: Top Layer Figure 2: Bottom Layer Notice: The information in this document is subject to change without notice. Users should warrant and guarantee that thirdparty Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV3371-R-00A Rev. 1.0 MonolithicPower.com 4/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 6