User’s Guide
Switching Regulator Series
Step-Down DC/DC Converter
BD9A101MUV-LB Evaluation Board
BD9A101MUV-EVK-001
This evaluation board has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9A101MUV-LB. While
accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60mΩ high-side N-channel MOSFET and 60mΩ low-
side N-channel MOSFET and a synchronization frequency is of 1MHz. A Soft Start circuit prevents in-rush current during startup. An EN pin allows
for simple ON/OFF control of the IC to reduce standby current consumption. A MODE pin allows the user to select fixed frequency PWM mode or
enables the light load mode control and the mode is automatically switched between the light load mode control and fixed frequency PWM mode.
Include OCP (Over Current Protection) and SCP (Short Circuit Protection).
Evaluation Board Operating Limits and Absolute Maximum Ratings (Ta=25℃)
Parameter
Supply Voltage
Output Voltage / Current
I
OUT
-
-
1
A
Symbol
V
CC
V
OUT
Limit
MIN
2.7
-
TYP
-
1.8
MAX
5.5
-
Unit
V
V
Conditions
Evaluation Board
Figure 1. BD9A101MUV-EVK-001 Evaluation Board
© 2017 ROHM Co., Ltd.
1/9
No. 60UG002E Rev.001
APR.2017
BD9A101MUV-EVK-001
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 2.7V to 5.5V/1A
(2) Maximum 1A 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 1A 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 2. 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.
© 2017 ROHM Co., Ltd.
2/9
No. 60UG002E Rev.001
APR.2017
BD9A101MUV-EVK-001
Circuit Diagram
V
IN
= 2.7V½5.5V, 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
BD9A101MUV-LB
14 PGD BOOT 13
R7
TP3
J2
User’s Guide
VOUT
GND
Figure 3. BD9A101MUV-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
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
PCB
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
-
GRM188B11H272KA01D
GRM188B11H103KA01D
-
FDSD0630-H-2R2M
MCR03EZPFX3002
MCR03EZPFX2402
MCR03EZPFX9101
MCR03EZPFX1002
MCR03EZPJ000
-
PH-1x03SG
61300311121
-
-
-
-
Buck DC/DC Converter
2 contacts, 15A, 14 to 22AWG
Jumper pin for SW1
FR4, 4-layer, 1oz
BD9A101MUV-LB
TB111-2-2-U-1-1
OSTTC022162
MJ254-6BK
969102-0000-DA
EVK029 Rev.A
Manufacturer
MURATA
MURATA
-
MURATA
-
MURATA
MURATA
-
TOKO
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
7066
1608
1608
1608
1608
1608
1608
-
-
VQFN016V3030
-
-
-
-
50×50×1.6
2700pF 50V, B, ±10%
0.01µF 50V, B, ±10%
-
2.2µH
30kΩ
24kΩ
9.1kΩ
10kΩ
0Ω
-
-
Not installed
±20%, DCR=17mΩmax, 8.1A
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
Tamukai
© 2017 ROHM Co., Ltd.
3/9
No. 60UG002E Rev.001
APR.2017
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