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ROHM Switching Regulator Solutions
Evaluation Board:
Step-down Switching Regulator
With Built-in Power MOSFET
BD9328EFJ / BD9329AEFJ (12V | 2A / 3A Output)
●Introduction
This application note will provide the steps necessary to operate and evaluate ROHM’s step-down switching regulator using the
BD9328EFJ/BD9329AEFJ evaluation boards. Component selection, board layout recommendations, operation procedures and application
data is provided.
●Description
This evaluation board has been developed for ROHM’s step-down switching regulator customers evaluating BD9328EFJ and/or
BD9329AEFJ. While accepting a wide power supply of 4.2-18V, a step down output of 3.3V or any external resistor defined voltage can be
produced. The ICs have two integrated low resistance N-channel MOSFETs and a fixed synchronization frequency of 380 kHz. A 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.
●Applications
Distributed Power Systems
Pre-regulator for linear regulators
●Evaluation Board Operating Limits and Absolute Maximum Ratings
Parameter Symbol
Limit
Unit Conditions
MIN TYP MAX
Supply Voltage
BD9328EFJ VCC 4.2 12 18 V
BD9329AEFJ VCC 4.2 12 18 V
Output Voltage / Current
BD9328EFJ VOUT - 3.3V - V
BD9329AEFJ VOUT - 3.3V - V
BD9328EFJ IOUT - - 2 A
BD9329AEFJ IOUT - - 3 A
●Evaluation Board
Below is the evaluation board with the BD9328EFJ. BD9329AEFJ eval board uses the same components and board layout
No.0000000014
Vout
Vin
High
E
N
Low
