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© 2017 ROHM Co., Ltd.
No. 60AP001E Rev.001
2017.4
© 2017 ROHM Co., Ltd.
No. 60UG004E Rev.001
APR.2017
User
’s Guide
Switching Regulator Series
Step-Down DC/DC Converter
BD9A301MUV-LB Evaluation Board
BD9A301MUV-EVK-001
BD9A301MUV-EVK-001 Evaluation board delivers an output 1.8 volts from an input 2.7 to 5.5 volts using BD9A301MUV-LB, a synchronous
rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. It offers high efficiency in all load ranges by
equipping the efficiency improvement function in light-load. The output voltage can be set by changing the external parts of circuit and the loop-
response characteristics also can be adjusted by the phase compensation circuit.
Performance specification
These are representative values, and it is not a guaranteed against the characteristics.
V
IN
= 5.0V, V
OUT
= 1.8V, Unless otherwise specified.
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage Range
2.7
5.5
V
Output Voltage
1.8
V
R1=
30kΩ, R2=24kΩ
Output Voltage Setting Range
0.8
V
IN
×0.7
V
Output Current Range
0
3.0
A
Loop Band Width
89.1
kHz
Phase Margin
54.1
degrees
Input Ripple Voltage
140
mVpp
I
O
= 3.0A
Output Ripple Voltage
40
mVpp
I
O
= 3.0A
Output Rising Time
5
ms
Operating Frequency
1.0
MHz
Maximum Efficiency
91.8
%
I
O
= 0.7A
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