Rohm Switching Regulator Series, BD9E303EFJ-LB, BD9E100FJ-LB, BD9A301MUV-LB User Manual
© 2017 ROHM Co., Ltd.
No. 60AP001E Rev.001
2017.4
© 2016 ROHM Co., Ltd.
No. 60UG018E Rev.002
APR.2017
User’s Guide
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage Range
7.0 36
V
Output Voltage
5.0 V
R1=30kΩ, R2=7.5kΩ
Output Voltage Setting Range
VIN×0.06
VIN×0.8
V
Output Current Range
0 3
A
Loop Band Width
18.2 kHz
Phase Margin
70.8
degrees
Input Ripple Voltage
300 mVpp
IO = 3A
Output Ripple Voltage
30 mVpp
IO = 3A
Output Rising Time
2.2 ms
Operating Frequency
300 kHz
Maximum Efficiency
91.1 %
IO = 1.2A
(NOTE1)
Switching Regulator Series
Step-Down DC/DC Converter
BD9E303EFJ-LB Evaluation Board
BD9E303EFJ-EVK-001
BD9E303EFJ-EVK-001 Evaluation board delivers an output 5.0 volts from an input 7.0 to 36 volts using BD9E303EFJ-LB, a synchronous rectification
step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. 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.
VIN = 24V, V
= 5.0V, Unless otherwise specified.
OUT
(NOTE1) However, (VIN×0.06) ≥ 1.0V
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User’s Guide
BD9E303EFJ-EVK-001
© 2016 ROHM Co., Ltd.
No. 60UG018E Rev.002
APR.2017
DC Voltmeter 1
DC Voltmeter 2
+
-
+
V
V
+
DC Power
Load
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 7.0V to 36V/3A
(2) Maximum 3A load
(3) DC voltmeter
2. Connecting the equipments
(1) DC power-supply presets to 24V 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.
(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 5.0V.
(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
(3pin) 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 0.8V, and normal-mode operation when
it is over 2.5V.
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User’s Guide
BD9E303EFJ-EVK-001
© 2016 ROHM Co., Ltd.
No. 60UG018E Rev.002
APR.2017
1 BOOT
2 VIN
7 PGND
3 EN
4 AGND
SW 8
COMP 6
FB 5
U1
BD9E303EFJ-LB
C7
C2
L1
C4
C6
R3
R1
R2
VIN
VOUT
C5
C1
C8
R4
C3
SW1
ON
OFF
GND
J1
TP1
TP2
J2
TP3
TP4
GND
TP5
TP6
9 E-PAD
2 C1, C7 Ceramic Capacitor
0.1µF 50V, B, ±20% GRM188B31H104MA92 MURATA 1608
1 C2 Ceramic Capacitor
10µF 50V, B, ±10% GRM32EB31H106KA12 MURATA 3225
0 C3 Ceramic Capacitor -
Not installed - - 3225
2 C4, C5 Ceramic Capacitor
22µF 10V, B, ±10% GRM31CB31A226KE19 MURATA 3216
1 C6 Ceramic Capacitor
6800pF 50V, B, ±10% GRM188B11H682KA01 MURATA 1608
0 C8 Ceramic Capacitor
- Not installed - - 1608
1 L1 Inductor
10µH ±20%, DCR=24mΩmax, 4.49A NS10155T100MNV TAIYO YUDEN 101101
1 R1 Resistor
30kΩ 1/10W, 50V, 1% MCR03EZPFX3002 ROHM 1608
1 R2 Resistor
7.5kΩ 1/10W, 50V, 1% MCR03EZPFX7501 ROHM 1608
1 R3 Resistor
15kΩ 1/10W, 50V, 1% MCR03EZPFX1502 ROHM 1608
1 R4 Resistor
0Ω Jumper MCR03EZPJ000 ROHM 1608
PH-1x03SG USECONN 61300311121 Wurth Electronics Inc. -
1 U1 IC
- Buck DC/DC Converter BD9E303EFJ-LB ROHM HTSOP-J8
TB111-2-2-U-1-1
Alphaplus Connectors & Cables
-
OSTTC022162
On Shore Technology Inc
MJ254-6BK USECONN 969102-0000-DA 3M -
1-Jumper
-
Jumper pin for SW1
2
J1, J2
Terminal Block
-
2 contacts, 15A, 14 to 22AWG
1
SW1
Pin header
-
2.54mm × 3 contacts
Reference
Designator
Count
Manufacturer
Part Number
Manufacturer
Configuration
(mm)
Type
Value
Description
Circuit Diagram
VIN = 7.2V to 36V, V
OUT
= 5.0V
Figure 2. BD9E303EFJ-EVK-001 Circuit Diagram
Bill of Materials
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User’s Guide
BD9E303EFJ-EVK-001
© 2016 ROHM Co., Ltd.
No. 60UG018E Rev.002
APR.2017
Layout
PCB size: 50mm×50mm×1.6mm
Figure 3. Top Silk Screen (Top view)
Figure 4. Top Silk Screen and Layout (Top view)
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