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© 2021 ROHM Co., Ltd.
No. 64UG035E Rev.001
AUG. 2021
User’s Guide
Switching Regulator Series
Buck Converter with Integrated FET
BD9E105FP4-Z EVK
BD9E105FP4-EVK-001 ( Input 12V to 24V
→
Output 5V, 1A )
Introduction
This user’s guide provides the necessary steps to operate the EVK of ROHM’s BD9E105FP4-Z 1-channel Buck DC/DC converter.
This includes the external parts, operating procedures, and application data.
Description
This EVK has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9E105FP4-Z that
outputs 5V from 12V to 24V input voltage range. The output range is from VIN x 0.1 (more than 0.7V) to VIN x 0.8 and it can be
designed as 0.596V x (R2+R3) / R3 by external resistors. The operating frequency is fixed at 500kHz. The current mode control
DC/DC converter provides high-speed transient response performance. Additional protection functions include a built-in soft start
function to prevent inrush current at startup, OVP (Over Voltage Protection), UVLO (Under Voltage Lock Out), TSD (Thermal
Shutdown Detection), SCP (Short Circuit Protection), and OCP (Over Current Protection).
Light load mode operation provides better efficiency in light-load conditions.
Application
Home Appliance
Secondary Power Supply and Adapter Equipment
Communication Equipment
Operating Limits
Table 1. Operating Limits
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage
12
-
24
V
Output Voltage
5
V
Output Current Range
1
A
Operating Frequency
500
kHz
Maximum Efficiency
97
%
VIN=12V, VOUT=5V
UVLO Detect Voltage
3.9
V
VIN sweep down
UVLO Hysteresis Width
350
mV