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
Input Voltage Range
Output Voltage
Output Voltage Setting Range
Output Current Range
Loop Band Width
Phase Margin
Input Ripple Voltage
Output Ripple Voltage
Output Rising Time
Operating Frequency
Maximum Efficiency
0.8
0
89.1
54.1
140
40
5
1.0
91.8
Min
2.7
1.8
V
IN
×0.7
3.0
Typ
Max
5.5
Units
V
V
V
A
kHz
degrees
mVpp
mVpp
ms
MHz
%
I
O
= 0.7A
I
O
= 3.0A
I
O
= 3.0A
R1=30kΩ, R2=24kΩ
Conditions
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No. 60UG004E Rev.001
APR.2017
BD9A301MUV-EVK-001
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 2.7V to 5.5V/3A
(2) Maximum 3A load
(3) DC voltmeter
2. Connecting the equipments
(1) DC power-supply presets to 5.0V and then the power output turns off.
(2) The maximum load should be set at 3A and over it will be disabled.
(3) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal.
User’s Guide
(4) Connect positive-terminal of power-supply to VIN+ terminal and negative-terminal to GND-terminal with a pair of wires.
(5) Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to GND-terminal with a pair of wires.
(6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement.
(7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement.
(8) DC power-supply output is turned ON.
(9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal.
(10) Check DC voltmeter 2 displays 1.8V.
(11) The load is enabled.
(12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.
+
DC Voltmeter 1
V
−
+
+
DC Power
−
−
+
V
−
DC Voltmeter 2
Load
Figure 1. Connection Diagram
Enable-Pin
To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin
(15pin) of the IC. Standby-mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal
and normal-mode operation by shorting between intermediate-terminal and ON-side terminal.
It also can be switched between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage
between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.5V, and normal-mode operation when
it is over 2.0V.
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No. 60UG004E Rev.001
APR.2017
BD9A301MUV-EVK-001
Circuit Diagram
V
IN
= 2.7V to 5.5V, V
OUT
= 1.8V
PGD
R4
TP1
J1
VIN
GND
TP2
SW1
ON
OFF
R5
C3 C2 C1
16 AVIN
1 PVIN
2 PVIN
3 PGND
4 PGND
15 EN
R3
ITH 7
8 MODE
R6
5 AGND
C8
R1
FB 6
TP6
R2
C10
SW 12
SW 11
SW 10
SS 9
C9
TP5
TP7
TP4
C7
L1
C4 C5 C6
U1
BD9A301MUV-LB
14 PGD BOOT 13
R7
User’s Guide
TP3
J2
VOUT
GND
Figure 2. BD9A301MUV-EVK-001 Circuit Diagram
Bill of Materials
Count
2
1
0
2
0
1
1
0
1
1
1
1
1
2
0
1
1
2
1
Reference
Designator
C1, C7
C2
C3
C4, C5
C6
C8
C9
C10
L1
R1
R2
R3
R4
R5, R7
R6
SW1
U1
J1, J2
-
Type
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Pin header
IC
Terminal Block
Jumper
Value
0.1µF
10µF
-
22µF
-
Description
50V, B, ±10%
16V, B, ±10%
Not installed
6.3V, B, ±20%
Not installed
Manufacturer
Part Number
GRM188B31H104KA92D
GRM31CB31C106KA88L
-
GRM21BB30J226ME38L
-
GRM188B11H332KA01D
GRM188B11H103KA01D
-
CLF7045T-1R5N
MCR03EZPFX3002
MCR03EZPFX2402
MCR03EZPFX9101
MCR03EZPFX1002
MCR03EZPJ000
-
PH-1x03SG
61300311121
-
-
-
Buck DC/DC Converter
2 contacts, 15A, 14 to 22AWG
Jumper pin for SW1
BD9A301MUV-LB
TB111-2-2-U-1-1
OSTTC022162
MJ254-6BK
969102-0000-DA
Manufacturer
MURATA
MURATA
-
MURATA
-
MURATA
MURATA
-
TDK
ROHM
ROHM
ROHM
ROHM
ROHM
-
USECONN
Wurth Electronics Inc.
ROHM
Alphaplus Connectors & Cables
17 EPAD
Configuration
(mm)
1608
3216
3216
2012
2012
1608
1608
1608
7269
1608
1608
1608
1608
1608
1608
-
-
VQFN016V3030
-
-
-
-
3300pF 50V, B, ±10%
0.01µF 50V, B, ±10%
-
1.5µH
30kΩ
24kΩ
9.1kΩ
10kΩ
0Ω
-
-
Not installed
±30%, DCR=14.3mΩmax, 7.3A
1/10W, 50V, ±1%
1/10W, 50V, ±1%
1/10W, 50V, ±1%
1/10W, 50V, ±1%
Jumper
Not installed
2.54mm × 3 contacts
On Shore Technology Inc
USECONN
3M
© 2017 ROHM Co., Ltd.
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No. 60UG004E Rev.001
APR.2017
Talking
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