EV3372-R-00A

EV3372-R-00A 8-Channel, Synchronous Boost WLED Driver with I2C Interface Evaluation Board DESCRIPTION FEATURES The EV3372-R-00A is an evaluation board for the MP3372, a synchronous boost converter with eight current channels. The IC is designed to drive WLED arrays for LCD panels in tablets and notebook backlighting applications.  3V to 30V Input Voltage Range  Maximum 2.5% Current Matching  350kHz/500kHz/650kHz,/800kHz/950kHz/ 1.2MHz Selectable fSW  A1 Pins for Two I2C Addresses  0mA to 50mA Full-Scale LED Current, 8 Bits, 0.196mA/Step  Selectable Sync or Non-Sync Mode  Multi-Dimming Operation Mode Includes: o Analog Dimming via External PWM Input, 10-Bit Resolution o Analog Dimming via I2C, 10-Bit Resolution o PWM Dimming via External PWM Input, 14-Bit Resolution o PWM Dimming via I2C, 14-Bit Resolution o Mixed Dimming Mode via External PWM Input with 6.25%/12.5%/25%/50% Transfer Point, 14-Bit PWM Duty Resolution o Mixed Dimming Mode via I2C with 6.25%/12.5%/25%/50% Transfer Point, 14-Bit PWM Duty Resolution  Phase Shift Function during PWM Dimming (Including PWM Dimming during Mixed Dimming)  Linear Smooth Dimming with 2µs, 4µs, 8µs, 16µs, 32µs, 64µs, or 128µs Step-Slope Set  Unused LED String Auto-Disable at Start-Up  LED Short/Open Protection, OTP, OCP, Inductor or Diode Short Protection: o 2.5V, 5V, 7.5V, 10V LED Short Threshold o 24V, 31V, 37.5V, or 46V OVP Threshold o 1.8 or 2.5A Current Limit  Cascade Function to Share Power Stage  Available in a QFN-24 (4mmx4mm) Package The MP3372 uses peak current mode and pulse-width modulation (PWM) control to regulate the boost converter. The MP3372 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 low-headroom voltage for LED regulation and small on resistance of the switching MOSFET provide the MP3372 with high efficiency. The synchronous rectifier saves PCB size and total BOM cost. The MP3372 is available (4mmx4mm) package. in a QFN-24 ELECTRICAL SPECIFICATIONS Parameter Input voltage Output voltage Symbol Value Units VIN 3 to 30 V VLED 1.2V). 4. Connect SCL, SDA, and GND to their respective locations on the configurable kit (EVKT-USBI2C02) with an I2C interface. 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, the PWM pin can be left alone or pulled to GND. EV3372-R-00A Rev. 1.0 MonolithicPower.com 8/27/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 3 EV3372-R-00A – 8-CHANNEL, 50V, SYNC BOOST WLED DRIVER W/ I2C EVAL BOARD POWER-ON SEQUENCE 1. VIN powers on. 2. EN powers on. 3. Set the registers using the GUI I2C interface (see Figure 1). 4. The PWM signal and LED string(s) should turn on. 5. Program the PWM duty cycle to dim the LED current. Figure 1: MP3372 GUI Interface EV3372-R-00A Rev. 1.0 MonolithicPower.com 8/27/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 4 EV3372-R-00A – 8-CHANNEL, 50V, SYNC BOOST WLED DRIVER W/ I2C EVAL BOARD EVALUATION BOARD SCHEMATIC EV3372-R-00A Rev. 1.0 MonolithicPower.com 8/27/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 5 EV3372-R-00A – 8-CHANNEL, 50V, SYNC BOOST WLED DRIVER W/ I2C EVAL BOARD EV3372-R-00A BILL OF MATERIALS Qty Ref Value 1 1 F1 MP1 0Ω NC 1 C1 1 Package Manufacturer Fuse or resistor PMOS 1206 SO-8 muRata RC1206JR-070RL 4.7µF Ceramic capacitor, 50V, X7R 1210 muRata GRM32ER71H475KA88L C2 100nF Ceramic capacitor, 16V, X7R 0603 muRata GRM188R71C104KA01D 2 C3, C4 2.2µF Ceramic capacitor, 100V, X7R 1210 muRata GRM32ER72A225KA35L 2 C6,C9 470nF Ceramic capacitor, 16V, X7R 0603 muRata GRM188R71C474KA88D 3 C5, C7, C8 NC Ceramic capacitor 0603 1 1 D1 D2 NC NC B190 SMA SMA 1 L1 10µH Inductor, 36mΩ, 3.2A SMD KENJET KJH8D43-100N 1 1 1 2 R2 R5 R6 R8, R9 20Ω 1kΩ 0Ω 2kΩ Resistor, 20Ω, 1% Resistor, 1kΩ, 1% Resistor, 0Ω, 1% Resistor, 2kΩ, 1% 0603 0603 0603 0603 Yageo Yageo Yageo Yageo RC0603FR-0720RL RC0603FR-071KL RC0603FR-070RL RC0603FR-072KL 1 1 R10 R11 R1, R3, R4, R7, R12 100kΩ 270Ω Resistor, 100kΩ, 1% Resistor, 270Ω, 1% 0603 0603 Yageo Yageo RC0603FR-07100RL RC0603FR-07270RL Resistor 0603 U1 MP3372 5 1 NC Description LED driver with I2C interface QFN-24 (4mmx4mm) MPS Manufacturer P/N MP3372GR EV3372-R-00A Rev. 1.0 MonolithicPower.com 8/27/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 6 EV3372-R-00A – 8-CHANNEL, 50V, SYNC BOOST WLED DRIVER W/ I2C 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. EV3372-R-00A Rev. 1.0 MonolithicPower.com 8/27/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 7