BU90002GWZ-EVK-101: 3.3V @ 1A, 4 ~ 5.5V in

This application note will provide the steps necessary to operate and evaluate ROHM’s synchronous buck DC/DC converter using the BU90002GWZ evaluation boards. Component selection, board layout recommendations, operation procedures and application data is provided.

This evaluation board has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BU90002GWZ. While accepting a power supply of 4.0-5.5V, an output of 3.3V can be produced. The IC has internal 250mOhm high-side P-channel MOSFET and 220mOhm low-side N-channel MOSFET and a synchronization frequency range of 5.4MHz to 6.6MHz. A fixed Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error prevention circuit) and TSD (thermal shutdown detection) protection circuits. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. A MODE pin allows the user to select Forced PWM (Pulse Width Modulation) mode or PFM (Pulse Frequency Modulation) and PWM auto change mode utilized power save operation at light load current.