Rohm BD8303MUV EVK User manual

Synchronous Buck-Boost Controller
BD8303MUV EVK
（BD8303MUV-EVK-001）

Notice
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© 2023 ROHM Co., Ltd. All rights reserved.
＜High Voltage Safety Precautions＞
◇Read all safety precautions before use
Please note that this document covers only the BD8303MUV evaluation board (BD8303MUV-EVK-
001) and its functions. For additional information, please refer to the datasheet.
To ensure safe operation, please carefully read all precautions before
handling the evaluation board
Depending on the configuration of the board and voltages used,
Potentially lethal voltages may be generated.
Therefore, please make sure to read and observe all safety precautions described in
the red box below.
Before Use
[1] Verify that the parts/components are not damaged or missing (i.e. due to the drops).
[2] Check that there are no conductive foreign objects on the board.
[3] Be careful when performing soldering on the module and/or evaluation board to ensure that solder
splash does not occur.
[4] Check that there is no condensation or water droplets on the circuit board.
During Use
[5] Be careful to not allow conductive objects to come into contact with the board.
[6] Brief accidental contact or even bringing your hand close to the board may result in
discharge and lead to severe injury or death.
Therefore, DO NOT touch the board with your bare hands or bring them too close to the board.
In addition, as mentioned above please exercise extreme caution when using conductive tools such as
tweezers and screwdrivers.
[7] If used under conditions beyond its rated voltage, it may cause defects such as short-circuit or,
depending on the circumstances, explosion or other permanent damages.
[8] Be sure to wear insulated gloves when handling is required during operation.
After Use
[9] The ROHM Evaluation Board contains the circuits which store the high voltage. Since it stores the
charges even after the connected power circuits are cut, please discharge the electricity after using it,
and please deal with it after confirming such electric discharge.
[10] Protect against electric shocks by wearing insulated gloves when handling.
This evaluation board is intended for use only in research and development facilities and
should by handled only by qualified personnel familiar with all safety and operating
procedures.
We recommend carrying out operation in a safe environment that includes the use of high
voltage signage at all entrances, safety interlocks, and protective glasses.

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© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
User’s Guide
Switching Regulator Series
Synchronous Buck-Boost Controller
BD8303MUV EVK
BD8303MUV-EVK-001 (7.4V → 12V, 1.5A)
Introduction
This user’s guide will provide the steps necessary to operate the BD8303MUV-EVK-001 and evaluate ROHM’s BD8303MUV synchronous
buck-boost DC/DC controller. Component selection, operating procedures and application data are included.
Description
This EVK uses a synchronous rectifying buck-boost DC / DC controller IC BD8303MUV to output 12V from an input voltage of 4V to 14V.
BD8303MUV accepts a power supply input range of 2.7V to 14V. The output voltage can be set from 1.8V to 12V with an external resistor. The
operating frequency can be set from 200kHz to 1MHz with an external resistor. The IC implements an efficient buck-boost converter using one
inductor and external N-Channel FETs. It has a built-in soft start function for rush current countermeasures at startup, UVLO (Under Voltage
Lock Out), TSD (Thermal Shutdown Detection), and SCP (Short Circuit Protection).
Application
General Portable Equipment such as:
•DVC (Digital Video Camera)
•Single-Lens Reflex Cameras
•Portable DVDs player
•Laptop PCs
Operating Limits
Table 1. Operating Limits
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage
4.0
7.4
14
V
Output Voltage
12
V
RINV1=330kΩ、RINV2=30kΩ
Output Current Range
1.5
A
Operating Frequency
400
kHz
RT=75kΩ
Maximum Efficiency
92
%
IOUT = 1.5A

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
EVK
Figure 1. BD8303MUV-EVK-001(Top View) Figure 2. BD8303MUV-EVK-001(Bottom View)
EVK Schematic
Figure 3. BD8303MUV-EVK-001 Schematic
VIN=7.4V
VOUT=12V/1.5A

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Operating Procedure
Below is the procedure to operate the EVK.
1. Turn off the power supply and connect power supply’s GND terminal to the GND terminal of the EVK.
2. Connect the power supply’s positive terminal to the VIN terminal of the EVK.
3. Check if the electronic load is turned off and connect the electronic load to the VOUT terminal and the GND terminal of the
EVK.
4. Connect the voltmeter to the VOUT_S terminal and the GND terminal of the EVK.
5. Check if the shunt jumper of STB_SW is at position H.
6. Turn on the power supply and check if the measured value of the voltmeter is 12V.
7. Turn on the electronic load.
Notes:
The board does not support hot plugging protection. Do not perform hot plugging on this board.
Operation State Settings
Table 2 is BD8303MUV condition using STB_SW.
Table 2. STB_SW Settings
STB_SW state
BD8303MUV Condition
ON (short to VIN)
Enable
OFF (short to GND)
Shutdown

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
BOM
Below is a table with the bill of materials.
Table 3. Bill of Materials
Count
Parts No.
Type
Value
Description
Part Number
Manufacturer
Configuration
Inch(mm)
1
U1
IC
-
Buck-boost DC/DC
Controller
BD8303MUV
ROHM
1111(3030)
2
CIN1, CIN2
Ceramic
Capacitor
10μF
25V, B, ±10%
GRM21BB31E106MA73
MURATA
0805(2012)
3
CO1, CO2, CO3
Ceramic
Capacitor
47μF
16V, B, ±20%
GRM32EB31C476ME15
MURATA
1210(3225)
1
CVCC
Ceramic
Capacitor
0.1μF
50V, X7R, ±10%
GRM155R71H104KE14
MURATA
0402(1005)
1
CREG
Ceramic
Capacitor
1μF
16V, B, ±10%
GRM155B31C105KA12
MURATA
0402(1005)
1
CFB
Ceramic
Capacitor
0.022μF
50V, B, ±10%
GRM155B11E223KA61
MURATA
0402(1005)
1
CC
Ceramic
Capacitor
68pF
50V, C0G, ±5%
885012005060
Wurth
elektronik
0402(1005)
0
CSTB, CO4
Ceramic
Capacitor
No mount
N/A
N/A
N/A
-
2
CB1, CB2
Ceramic
Capacitor
0.1μF
50V, X7R, ±10%
GRM155R71H104KE14
MURATA
0402(1005)
1
RT
Resistor
75kΩ
50V, 0.1W, ±0.5%
MCR03EZPD7502
ROHM
0603(1608)
1
RFB
Resistor
7.5kΩ
50V, 0.1W, ±0.5%
MCR03EZPD7501
ROHM
0603(1608)
1
RINV1
Resistor
330kΩ
50V, 0.1W, ±0.5%
MCR03EZPD3303
ROHM
0603(1608)
1
RINV2
Resistor
30kΩ
50V, 0.1W, ±0.5%
MCR03EZPD3002
ROHM
0603(1608)
1
RC
Resistor
5.1kΩ
50V, 0.1W, ±0.5%
MCR03EZPD5101
ROHM
0603(1608)
4
RG1, RG2, RG3, RG4
Resistor
22Ω
50V, 0.1W, ±0.5%
MCR03EZPD22R0
ROHM
0603(1608)
0
RSTB, RFRA
Resistor
-
SHORT
N/A
N/A
-
4
Q1, Q2, Q3, Q4
FET
30V, 7A
Nch, VGS=4.5V,
RDS(on)=25mΩ
5.8nC, SOP-8
RXH070N03
ROHM
2024(5060)
2
DB1, DB2
Diode
30V, 0.1A
VF(max)=0.35V,
@IF=0.01A
RB521CM-30
ROHM
0403(1006)
0
DA1, DA2
Diode
No mount
N/A
N/A
N/A
-
1
L
Inductor
4.7μH
8.5A, -40%-+20%
74477004
Wurth
elektronik
0.47 x 0.47
(12 x 12)
0
FILT
Inductor
-
SHORT
N/A
N/A
-
0
STB_SW
-
-
SWITCH
-
-
-
0
JSTB
-
-
SHORT
N/A
N/A
-
Note.
If the overshoot voltage exceeds the maximum rating of 15V for SW1 and SW2, adjust the gate resistance value. Be careful not
to overlap the high side and low side gate voltages.
As an alternative, add a resistor and capacitor snubber circuit between the SW1 terminal and GND, and between the SW2
terminal and GND.
Recommended parts are selected from those products and information available at the time this data sheet (Rev.001) was
released. If supply conditions change and parts are not available, use similar parts.

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Board Layout
EVK PCB information
Number of
Layers
Material
Board Size
Copper
Thickness
4
FR-4 High TG
80mm x 70mm x 1.6mmt
1oz (35μm)
Followings are the layout of BD8303MUV-EVK-001
Figure 4. Top PCB image Figure 5. Bottom PCB image
(Top View) (Top View)
Figure 6. Top Layer Silkscreen layout Figure 7. Top Layer layout
(Top View) (Top View)

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Figure 8. Middle1 Layer (VIN) layout Figure 9. Middle2 Layer (GND) layout
(Top View) (Top View)
Figure 10. Bottom Layer layout
(Top View)

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Reference Application Data
Figure 11. Efficiency vs Load Current (VCC=4V to 14V, VOUT=12V)
Figure 12. Transient Load Response
(VCC=7.4V, Iout=0.1A→1.5A)
Figure 13. Transient Load Response
(VCC=7.4V, Iout=1.5A→0.1A)
VOUT=500 mV/div
Iout=500mA/div
Slew rate=30mA/μs
Time=500 µs/div
VOUT=500 mV/div
Time=500 µs/div
Iout=500mA/div
Slew rate=30mA/μs

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Reference Application Data - continued
Figure 14. Output Ripple Voltage
(VCC=7.4V, Iout=1.5A)
Figure 15. Output Ripple Voltage
(VCC=7.4V, Iout=1.5A)
Vout=50mV/div
Time=1 µs/div
Time=1 µs/div
SW1=5V/div
SW2=5V/div

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User’s Guide
BD8303MUV-EVK-001
© 2021 ROHM Co., Ltd.
No. 63UG045E Rev.002
OCT.2023
Revision History
Date
Revision
Number
Description
22. Feb. 2021
001
Initial release
18. Oct. 2023
002
p.2 Changed to a photo with RG1, RG2, RG3, and RG4 added in Figure.1.
p.4 CC 68pF of Table.3 is change from GRM1552C1H680JA01 to 885012005060.
p.4 RFB of Table.3 is change from MCR03ECPD7501 to MCR03EZPD7501.
p.4 Add comment. " Recommended parts are selected from those products and information available at the time this
user’s guide (Rev.001) was released. If supply conditions change and parts are not available, use similar parts."
p.5 Copper Thickness changed from 2oz to 1oz.

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The information contained in this document is intended to introduce ROHM Group (hereafter
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