Rohm BD9A100MUV User Manual
Switching Regulator Series
Step-Down DC/DC Converter
BD9A100MUV Evaluation Board
BD9A100MUV-EVK-001
Description
This evaluation board has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating
BD9A100MUV. While accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60m
high-side N-channel MOSFET and 60m 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 Deep-SLLM
control and the mode is automatically switched between the Deep-SLLM 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 Symbol
MIN TYP MAX
Limit
Unit Conditions
Supply Voltage VCC 2.7 - 5.5 V
Output Voltage /
Current
Evaluation Board
- 1.8 - V
V
OUT
I
- - 1 A
OUT
Figure 1. BD9A100MUV-EVK-001 Evaluation Board
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9 September 2015 Rev.002
BD9A100MUV-EVK-001
V
+
-
+
-
+
DC Voltmeter 2
V
-
+
Load
-
Figure 2. Connection Diagram
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 max. 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.
(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
DC Power
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 0.5V, and normal-mode
operation when it is over 2.0V.
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9 September 2015 Rev.002
A
A
BD9A100MUV-EVK-001
Cricuit Diagram
= 2.7V～5.5V, V
V
IN
OUT
= 1.8V
BD9
U1
100MUV
VIN
BOOT 13
SW 12
SW 11
SW 10
SS 9
ITH 7
Ｄ
Ａ
Ｐ
Ｅ
FB 6
7
1
R3
TP6
R7
C7
TP5
C9
C8
R2
L1
TP7
TP3
C4 C 5 C6
TP4
R1
C10
P G D
14 PGD
C1 C 2 C3
R5
R6
R 4
16
1PVIN
2PVIN
3PGND
4PGND
15 EN
8MODE
5AGND
VIN
G N D
J1
TP 1
TP2
O FF
S W1
ON
Figure 3. BD9A100MUV-EVK-001 Circuit Diagram
Bill of Materials
Reference
Count
Designator
2 C1, C7 Ceramic Capacitor 0.1µF 50V, B, ±10% GRM188B31H104KA92D MURATA 1608
1 C2 Ceramic Capacitor 10µF 16V, B, ±10% GRM31CB31C106KA88L MURATA 3216
0 C3 Ceramic Capacitor - Not installed - - 3216
2 C4, C5 Ceramic Capacitor 22µF 6.3V, B, ±20% GRM21BB30J226ME38L MURATA 2012
0 C6 Ceramic Capacitor - Not installed - - 2012
1 C8 Ceramic Capacitor 2700pF 50V, B, ±10% GRM188B11H272KA01D MURATA 1608
1 C9 Ceramic Capacitor 0.01µF 50V, B, ±10% GRM188B11H103KA01D MURATA 1608
0 C10 Ceramic Capacitor - Not installed - - 1608
1 L1 Inductor 2.2µH ±20%, DCR=17mmax, 8.1A FDSD0630-H-2R2M TOKO 7066
1 R1 Resis tor 30k 1/10W, 50V, ±1% MCR03EZPF3002 ROHM 1608
1 R2 Resis tor 24k 1/10W, 50V, ±1% MCR03EZPF2402 ROHM 1608
1 R3 Res istor 9.1k 1/10W, 50V, ±1% MCR03EZPF9101 ROHM 1608
1 R4 Resis tor 10k 1/10W, 50V, ±1% MCR03EZPF1002 ROHM 1608
2 R5, R7 Resistor 0 Jumper MCR03EZPJ000 ROHM 1608
0 R6 Resis tor - Not installed - - 1608
1 SW1 Pin header - 2.54mm × 3 contacts PH-1x03SG USECONN -
1 U1 IC - Buck DC/DC Converter BD9A100MUV ROHM VQFN016V3030
2 J1, J2 Terminal Block - 2 contacts, 15A, 14 to 22AWG TB111-2-2-U-1-1
1 - Jumper - Jumper pin for SW1 MJ254-6BK USECONN -
1 - PCB - FR4, 4-layer, 1oz EVK029 Rev.A Tamukai 50×50×1.6
Type Value Description
Manufacturer
Part Number
Manufacturer
Alphaplus
Connectors
& Cables
J2
VOUT
GND
Configuration
(mm )
-
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© 2015 ROHM Co., Ltd. All rights reserved.
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9 September 2015 Rev.002
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