BD9B301MUV-EVK-101 ROHM

EVK Users Manual ROHM Switching Regulator Solutions Evaluation Board: Synchronous Buck Converter Integrated FET BD9B301MUV-EVK-101 (3.3 3A Output) Introduction This application note will provide the steps necessary to operate An EN pin allows for simple ON/OFF control of the IC to reduce and evaluate ROHMs synchronous buck DC/DC converter standby current consumption, while a MODE pin enables users using the BD9B301MUV-EVK-101 evaluation board. Component to select Fixed Frequency PWM mode or Deep SLLM control that selection, board layout recommendations, operating procedures, automatically switches between modes. and application data are provided. Applications Step-Down Power Supplies for DSPs, FPGAs, Description Microcontrollers, and more Laptop PCs/Tablet PCs/Servers This evaluation board has been specifically developed to evaluate LCD TVs ROHMs BD9B301MUV synchronous buck DC/DC converter with Storage Devices (HDDs/SSDs) integrated 32m Pch high-side and Nch low-side MOSFETs. Printers, OA Equipment Features include 3.3V output from 2.7V to 5.5V input and variable Entertainment Devices switching frequency: 1MHz (FREQ pin connected to VIN) or 2MHz Distributed and Secondary Power Supplies (FREQ pin connected to Ground). Multiple protection cricuits are also buil in, including a fixed soft start circuit that prevents inrush current during startup, UVLO (Under Voltage Lock Out), and TSD (Thermal Shutdown). Evaluation Board Operating Limits and Absolute Maximum Ratings Limit Parameter Symbol Unit Conditions MIN TYP MAX Supply Voltage BD9B301MUV VCC 2.7 5.5 V Output Voltage/Current VOUT 3.3 V BD9B301MUV IOUT 3 A 2017 ROHM CO., Ltd. No. 60UG024E Rev.001 1 OCT 2017EVK Users Manual Eval Board: Synchronous Buck Converter Integrated FET Evaluation Board Figure 1: Evaluation Board for the BD9B301MUV Board Schematic VOUT R1 140 5% 1/10W 0603 AVIN PGD LED AVIN VIN CR1 SML-310MTT86 R2 LED 0603 100k TP1 PGD QC 5% 1/10W (INPUT: 2.7-5.5 VDC) U1 0603 PGD QB VIN BD9B301MUV R3 1k B Q1 VQFND16V3030 5% SST2222AT116 0603 1 (OUTPUT: 3.3V 3A) 14 PGD 1/10W SOT23 TP2 PVIN PGD AVIN 2 VOUT D1 C1 C2 PVIN L1 P48MA6.8A 10F 0.1F 1.5H DO-214A/C 10% 10% 16 10 SW TP3 AVIN SW TP4 5.8V 10V 16V 11 20% 74437349015 C5 C6 C3 SW 39.0A 1206 0603 0.1F 12 8A SMT 6P6x6P6 22F 22F C7 C8 C9 SW 10% R4 10% 10% 0603 0805 1206 C4 C10 TP5 6.3V 6.3V DNP DNP DNP 16V 0.1F 160k 180pF 0603 1210 1210 5 10% 1% 5% AGND AVIN 16V 1/10W 50V J1 13 BOOT 0603 0603 0603 BOOT 1 3 PGND 2 EN 4 6 FB PGND FB 3 15 R5 EN 87224-3 FREQ 7 51k FREG J2 8 1% MODE VOUT=0.8*(R4+R5)/R5 1 SS 9 17 1/10W EPAD SS 0603 2 3 C11 87224-3 0603 DNP J3 1 2 MODE 3 87224-3 BD9B301MUV EVM Jumper Positions Reference Position Description Designator Note: 2-1 Enable U1 1. 0.8V=< VOUT =V 0.8*VIN J1 2-3 Disable U1 2-1 Set switching frequency of U1 is 1.0MHz J2 2-3 Set switching frequency of U1 is 2.0MHz 2-1 Set operation mode of U1 is fixed frequency PWM mode J3 Set operation mode of U1 is automatically switched between 2-3 the Deep-SLLM control and fixed frequency PWM mode Figure 2: BD9B301MUV-EVK-101 Evaluation Board Schematic 2017 ROHM CO., Ltd. No. 60UG024E Rev.001 2 OCT 2017