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© 2023 ROHM Co., Ltd.
No. 66UG033E Rev.001
2023.7
User’s Guide
Battery Management System Reference Design
Maxell’s All-solid-state Battery + Nano Energy™
Collaboration Board for Energy Harvesting
REFLVBMS003-EVK-001
Introduction
This user’s guide provides the information and necessary procedures to operate and evaluate Maxell’s all-solid-state
battery (PSB401010H or PSB401515H) + Nano Energy
TM
collaboration board for energy harvesting. It includes the board
schematic, peripheral parts list, and operating instructions.
Please note that this board has been prepared for the purpose of simple evaluation of Maxell’s all-solid-state battery and
Nano Energy
TM
characteristics, and we cannot guarantee its quality. In addition, this evaluation board is intended to be used
by professionals for research and development purposes. This board is not intended to be used in mass production products
or any part thereof.
Note: Nano Energy
TM
is a trademark or registered trademark of ROHM Co., Ltd.
Description
This collaboration board has the function to charge Maxell’s all-solid-state battery (PSB401010H or PSB401515H) with the
generated current from an energy harvester, such as a solar cell, and to boost and stabilize the power stored in this all-solid-
state battery to the voltage required for the application. The voltage boosting DC converter IC (BD8B133NVX) is equipped
with Nano Energy
TM
ultra-low current consumption technology to maximize the battery life.
For the specifications of the Charger IC dedicated for Maxell's all-solid-state battery and step-up DC-DC converter IC,
please refer to the datasheet in ROHM Co. Ltd.’s website. For the specifications of the all-solid-state battery (PSB401010H
and PSB401515H), please refer to the datasheet in Maxell’s website.
Maxell, Ltd., web site (
https://www2.maxell.co.jp/ )
Maxell’s all-solid-state battery special web site ( https://biz.maxell.com/en/rechargeable_batteries/allsolidstate.html )
Battery
PSB401010H, PSB401515H
ROHM Co., Ltd. web site ( https://www.rohm.com/ )
Charger IC
ML9077
Step-up DC-DC converter
BD8B133NVX (Under development *As of July 2023)
Storage Precautions
The board is equipped with a battery. When storing the board, keep it in individual bags to prevent short-circuit between
the positive and negative terminals of the battery. Also, set the EN switch of the board to “L” to turn off the DC-DC converter.
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© 2023 ROHM Co., Ltd.
No. 66UG033E Rev.001
2023.7
User’s Guide
Operating conditions
Figure 1：Block Diagram of Battery and each ICs
Figure 1 shows the block diagram of the collaboration board. Connecting an energy harvester (current output power
generation device like a solar cell) to the SC terminal initiates charging of the all-solid-state battery (PSB401010H or
PSB401515H) from the charge control IC (ML9077). If charging is not required, leave the SC terminal open.
The charger IC (ML9077) constantly monitors the terminal voltage of the all-solid-state battery and starts the DC-DC
converter operation when the battery voltage exceeds the set detection voltage.
The DC-DC converter (BD8B133NVX) converts the power stored in the all-solid-state battery (PSB404010H or
PSB401515H) with high efficiency. The discharge time is determined by the power stored in the battery.
Below are the recommended operating conditions for the Maxell’s all-solid-state battery + Nano Energy
TM
collaboration
board:
Item
Symbol
Min
Typ
Max
Unit
Conditions
SC input voltage
V
SC
0
ー
3.6
V
Charger Input
VOUT output current
I
OUT
ー
ー
(*1)
mA
*1 (All solid-state battery capacity)
/boost-up ratio
Operating Ambient
Temperature
(Charging)
T
a,chg
-20
ー
70
°C
Depends on Charger IC regulations
Operating Ambient
Temperature
(Discharge)
T
a,dischg
-20
ー
70
°C
Depends on Charger IC regulations
Table 1：Recommended Operating Conditions
Typical characteristics are shown below. For the detailed characteristics, please refer to the datasheet of each IC.
Item
Symbol
Min
Typ
Max
Unit
Conditions
DC-DC converter on
voltage
V
dcdcon
1.7
1.8
1.9
V
BOD detection of Charger IC
Output voltage setting
range
V
OUTSEL
3.0
-
3.3
V
2-step setting (VSEL=L or H)
Output Voltage Accuracy
V
TOL
-4.0
0.0
4.0
%
Iout＝0mA
Startup load
R
stup
3.0
ー
ー
kΩ
Activatable load resistance
Charge voltage
V
CHG
0
ー
2.7
V
SCLV=L
Charge current
I
CHG
ー
(*2)
ー
μA
*2 Energy Harvester Generation
Current
Table 2：Typical Specification Values of ICs (Excerpt)
BD8B133
PSB
40xxxxH
ML9077SC
VOUT
EN
VBAT
VBOD
VBOD=H (VBAT>1.8V)