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© 2022 ROHM Co., Ltd.
No. 64UG041E Rev.001
2022.2
User’s Guide
Switching Regulator Series
Buck Converter with Integrated FET
BD9E304FP4-LBZ EVK
BD9E304FP4-EVK-002 (24V→12V, 3.0A)
Introduction
This user’s guide provides the necessary steps to operate the EVK of ROHM’s BD9E304FP4-LBZ 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 BD9E304FP4-LBZ
and outputs 12V from 24V input voltage. The BD9E304FP4-LBZ accepts a power supply input range of 4.5V to 36V and
generates an output voltage ranging from (0.1 x V
IN
or 0.7V) to 0.8 x V
IN
using external resistors. The operating frequency is
fixed at 300 kHz. The Light Load Mode control provides good efficiency characteristics in light load conditions, which is
ideal for applications that needs to lessen the standby power. 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, UVLO (Under Voltage Lock Out), TSD (Thermal Shutdown Detection), SCP (Short Current Protection),
OCP (Over Current Protection), and OVP (Over Voltage Protection).
Application
Industrial Products as Factory Automation
Secondary power supply and adapter equipment
Telecommunication Devices
Operating Limits
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage
18.0
24.0
36.0
V
Output Voltage
12.0
V
Output Current Range
3.0
A
Operating Frequency
300
kHz
Maximum Efficiency
96.5
%
Vin=24V, Iout=0.6A
UVLO Detect Voltage
3.9
V
Vin sweep down
UVLO Hysteresis Width
350
mV
