1
ROHM Switching Regulator Solutions
Evaluation Board:
Step-down Switching Regulator
With Built-in Power MOSFET
BD9G101G (5V | 0.5A Output)
●
Introduction
This application note
will provide the steps necessary to operate and evaluate ROHM’s step-down switching regulator using the BD9G101G
evaluation boards. Board layout recommendations, operation procedures, application data and build of materials are provided.
●
Description
This evaluation board has been developed for ROHM’s step-down switching regulator customers evaluating BD9G101G. While accepting a
wide power supply of 6-42V, a step down output of 1V-29V can be produced. The IC has an internal 800mohm Nch MOSFET (1A max) and
a fixed operating frequency range of 1.5MHz. A Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error
prevention circuit), OCP (over-current protection) 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
Industrial distributed power applications
Automotive and battery powered equipment
●
Evaluation Board Operating Limits and Absolute Maximum Ratings
Parameter
Symbol
Limit
Unit
Conditions
MIN
TYP
MAX
Supply Voltage
BD9G1010G
VCC
6
-
42
V
Output Voltage / Current
BD9G101G
VOUT
-
5
-
V
*Set by R1 and R2
BD9G101G
IOUT
-
0.5
-
A
●
Evaluation Board
Below is the evaluation board with the BD9G101G. Component selection and board layout guidelines are provided in the
BD9G101G datasheet.
No.0000000015
BD9673EFJ Eval Board
BD9G101G Eval Board (Back)
GND
Vout
BD9G101G Eval Board (Front)
EN
VOUT
VCC
GND
ENABLE
H: Active
(IC
OFF)
L: Inactive
(IC
ON)
