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© 2015 ROHM Co., Ltd. All rights reserved.
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29.JUN.2015 Rev.001
Switching Regulator Series
Step-Down DC/DC Converter
BD9B300MUV Evaluation Board
BD9B300MUV-EVK-001
Description
BD9B300MUV-EVK-001 Evaluation board delivers an output 1.2 volts from an input 2.7 to 5.5 volts using BD9B300MUV, 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. An EN pin allows for simple ON/OFF control of the IC to reduce standby current
consumption. A adjustable soft start circuit prevents in-rush current during startup along. A MODE pin allows the user to select
fixed frequency PWM mode or enables the Deep-SLLM control and the mode is automatically switched between the Deep-
SLLM control and fixed frequency PWM mode. A synchronization frequency is of 1MHz (FREQ pin is connected to VIN) or
2MHz (FREQ pin is connected to ground).
Performance specification (These are representative values, and it is not a guaranteed against the characteristics.)
VIN = 5.0V, VOUT = 1.2V, Unless otherwise specified.
Parameter
Min
Typ
Max
Units
Input Voltage Range
2.7
5.5
V
Output Voltage
1.2
V
Output Voltage Setting Range
0.8
VIN×0.8
V
Output Current Range
0
3.0
A
Input Ripple Voltage
90
mVpp
Output Ripple Voltage
25
mVpp
Output Rising Time
7
ms
Operating Frequency
1.0
MHz
Maximum Efficiency
89.8
%
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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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 max. 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.
(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 1.2V.
(11) The load is enabled.
(12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.
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 swithed 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 0.3V, and normal-mode operation
when it is over 2.0V.
Load
DC Power
DC Voltmeter 1
DC Voltmeter 2
+
-
+
-
+
-
+
-
V
V
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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2 C1, C7 Ceramic Capacitor 0.1µF
50V, B, ±10% GRM188B31H104KA92D MURATA 1608
1C2 Ceramic Capacitor 10µF
16V, B, ±10% GRM31CB31C106KA88 MURATA 3216
0C3 Ceramic Capacitor
- Not installed - - 3216
2 C4, C5 Ceramic Capacitor
22µF 6.3V, B, ±20% GRM31CB30J226ME18 MURATA 3216
0C6 Ceramic Capacitor
- Not installed - - 3216
1C9 Ceramic Capacitor
0.01µF 50V, B, ±10% GRM188B11H103KA01D MURATA 1608
1C10 Ceramic Capacitor
120pF 50V, C0G, ± 5% GRM1885C1H121JA01 MURATA 1608
1L1 Inductor
1.5µH ±20%, DCR=33.4mΩmax, 7.8A SPM5020T-1R5M TDK 5451
1R1 Resistor
75kΩ 1/10W, 50V, ±1% MCR03EZPF7502 ROHM 1608
1R2 Resistor
150kΩ 1/10W, 50V, ±1% MCR03EZPF1503 ROHM 1608
1R4 Resistor
100kΩ 1/10W, 50V, ±5% MCR03EZPJ104 ROHM 1608
0 R5, R9 Resistor
- Not installed - - 1608
3 R6, R7, R8 Resistor
0Ω Jumper MCR03ERPJ000 ROHM 1608
1 SW1 Pin header
- 2.54mm × 3 contacts PH-1x03SG USECONN -
1U1 IC
- Buck DC/DC Converter BD9B300MUV ROHM VQFN016V3030
2
J1, J2 Terminal Block - 2 contacts, 15A, 14 to 22AWG TB111-2-2-U-1-1
Alphaplus
Connectors
& Cables
-
1 - Jumper
- Jumper pin for SW1 MJ254-6BK USECONN -
Reference
Designator
Count
Manufacturer
Part Number
Manufacturer
Configuration
(mm)
Type
Value
Description
R8 R9
0Ω - Set switching frequency is 1MHz
-0Ω Set switching frequency is 2MHz
Reference Designator
Description
R5 R6
0Ω - Set operation mode is fixed frequency PWM mode
-0Ω
Set operation mode is automatically switched between
the Deep-SLLM control and fixed frequency PWM mode
Reference Designator
Description
Cricuit Diagram
VIN = 2.7V to 5.5V, VOUT = 1.2V
Figure 2. BD9B300MUV-EVK-001 Circuit Diagram
Bill of Materials
1
P
V
I
N
1
5
E
N
1
6
A
V
I
N
5
A
G
N
D
S
W
1
O
N
O
F
F
C
1
C
2
C
3
T
P
1
V
I
N
G
N
D
S
W
1
2
C
7
T
P
5
L
1
C
4
C
5
C
6
T
P
3
V
O
U
T
G
N
D
F
B
6
R
2
R
1
C
1
0
U
1
B
D
9
B
3
0
0
M
U
V
T
P
2
R
7
T
P
6
T
P
4
2
P
V
I
N
3
P
G
N
D
4
P
G
N
D
S
W
1
1
S
W
1
0
S
S
9
C
9
T
P
7
J
1
J
2
B
O
O
T
1
3
1
4
P
G
D
P
G
D
R
4
8
M
O
D
E
R
5
R
6
1
7
Ｅ
Ｐ
Ａ
Ｄ
R
8
R
9
7
F
R
E
Q
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
© 2015 ROHM Co., Ltd. All rights reserved.
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Layout
Figure 3. Top Silk Screen (Top view)
Figure 4. Top Silk Screen and Layout (Top view)
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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Figure 5. Top Side Layout (Top view)
Figure 6. L2 Layout (Top view)
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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Figure 7. L3 Layout (Top view)
Figure 8. Bottom Side Layout (Top view)
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10
Efficiency (%)
Load Current (A)
VIN=3.3V
VIN=5.0V
VO=1.2V
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
2 2.5 3 3.5 4 4.5 5 5.5 6
Output Voltage Change (%)
Input Voltage (V)
IO=1.0A
VO=1.2V
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0 0.5 1 1.5 2 2.5 3
Output Voltage Change (%)
Load Current (A)
VIN=3.3V
VIN=5.0V
VO=1.2V
Figure 9. Efficiency vs Load Current
Figure 10. Line Regulation
Figure 11. Load Regulation
Figure 12. Load Transient Characteristics
VO (AC)
50mV/div
IO: 1A/div
IO: 0.5A/div
Time scale 50μs/div
VIN = 5.0V
VO = 1.2V
VIN = 5.0V
VO = 1.2V
IO: 0.75A→2.25A→0.75A
IO: 20mA→1A→20mA
VO (AC)
50mV/div
Time scale 500μs/div
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
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Figure 13. Input Voltage Ripple Wave
VIN = 3.3V, VO = 1.2V
Figure 14. Input Voltage Ripple Wave
VIN = 5.0V, VO = 1.2V
Figure 15. Output Voltage Ripple Wave
VIN = 3.3V, VO = 1.2V
Figure 16. Output Voltage Ripple Wave
VIN = 5.0V, VO = 1.2V
VIN (AC)
50mV/div
Time scale 500ns/div
Time scale 500ns/div
VIN (AC)
50mV/div
IO = 0A
IO = 3.0A
VIN (AC)
50mV/div
VIN (AC)
50mV/div
IO = 0A
IO = 3.0A
Time scale 500ns/div
Time scale 500ns/div
Time scale 10ms/div
Time scale 10ms/div
IO = 0A
IO = 3.0A
VO (AC)
50mV/div
VO (AC)
50mV/div
Time scale 10ms/div
Time scale 10ms/div
IO = 0A
IO = 3.0A
VO (AC)
50mV/div
VO (AC)
50mV/div
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BD9B300MUV-EVK-001
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29.JUN.2015 Rev.001
© 2015 ROHM Co., Ltd. All rights reserved.
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Figure 17. Start-up EN = VIN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
Figure 18. Power-down EN = VIN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
Figure 19. Start-up EN = VIN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
Figure 20. Power-down EN = VIN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
Figure 21. Start-up by EN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
Figure 22. Power-down by EN
VIN = 5.0V, VO = 1.2V, RL = 1.2Ω
VIN
2V/div
EN
2V/div
VO
0.5V/div
Time scale 5ms/div
Time scale 5ms/div
Time scale 5ms/div
Time scale 5ms/div
Time scale 5ms/div
Time scale 5ms/div
VIN
2V/div
EN
2V/div
VO
0.5V/div
VIN
2V/div
EN
2V/div
VO
0.5V/div
R1102
A
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and verify the latest specifica-
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Examples of application circuits, circuit constants and any other information contained herein are
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The technical information specified herein is intended only to show the typical functions of and
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