How to use small li-ion rechargeable batteries

3. How to use small li-ion rechargeable batteries
3-1 How to charge small li-ion
rechargeable batteries* The following data are not guaranteed values.

The recommended charging method is to first charge tothe maximum rated voltage of 2.8V using constant-current
charging, and then maintain the charge at the rated
voltage of 2.8V (constant-voltage charging). Figure 3-1
shows the voltage and charging current value when theφ3x7L is charged at a current value of 5C (1.75mA). Afterbeing charged using constant-current charging to themaximum rated voltage of 2.8V, the battery was held at its
rated voltage of 2.8V. Charging was halted when current
value reached 5% of current value capacity (0.0175mA).
* The following data are not guaranteed values.

Figure 3-2. Relationship between discharging current
value and discharging time for φ3x7L

Figure 3-1. Constant current-constant voltage charging
curve for φ3x7L

3-2 How to discharge small li-ion
rechargeable batteries

The cycle properties deteriorates when the charge on
the SLB falls below 1.8V. Figure 3-2 shows the discharge
capacity relationship for various discharge current
values. When the φ3x7L is discharged at 1C (0.35mA),
the discharge takes approximately 1 hour. At 20C(7mA), discharging occurs in around 3 minutes. As thedischarging current increases, the internal resistancecauses the voltage to drop substantially, so as thedischarge capacity decreases, the discharge current
increases.

Small Li-Ion Rechargeable Batteries Technical Notes CAT. 8601

How to use small li-ion rechargeable batteries

3-3 Recommended ICs for charging/discharging
Because a maximum charging voltage and minimum
discharge voltage have been set for small li-ion
rechargeable batteries, voltage control is required.
Table 3-1 gives examples of ICs that can be used inmonitoring the charging and discharging of the SLB

series. NICHICON does not guarantee the operationof the ICs listed in the table, so please check with their
manufacturers when considering the use of these ICs.
For details on control ICs, please check the data sheets
provided by the ICs’ manufacturers.

Table 3-1. Recommended ICs
No.

Supplier

Part No.

FeatureNichicon type No.

1Analog Devices

LTC4079

Linear Charger

SLB08115L140
SLB12400L151

2Analog Devices

LTM4661µModule Regulator

SLB08115L140
SLB12400L151

3

Renesas Electronic

RE01

Renesas MCU

SLB03070LR35
SLB08115L140
SLB12400L151

4

RICOH
Electronic Devices

R1800
R1801

Buck DC/DC Converter

SLB03070LR35
SLB08115L140

5

RICOH
Electronic Devices

RP604
RP605

Buck-Boost DC/DC Converter

SLB03070LR35
SLB08115L1406

ROHM

BD99954GW/MWVBattery Manager

SLB12400L151

7

ROHM

BD71631QWZLinear Charger

SLB03070LR35
SLB08115L1408TOREXSEMICONDUCTORXC8109

High Function Power Switch

SLB03070LR35
SLB08115L140
SLB12400L151

9TOREXSEMICONDUCTOR

XC6504LDO

SLB03070LR35
SLB08115L140
SLB12400L151

10TOREXSEMICONDUCTOR

XC6240LDO

SLB03070LR35
SLB08115L140
SLB12400L151
Small Li-Ion Rechargeable Batteries Technical Notes CAT. 8601

How to use small li-ion rechargeable batteries

11TOREXSEMICONDUCTOR

XC6140C

Reset ICSLB03070LR35
SLB08115L140
SLB12400L151

12TOREXSEMICONDUCTORXCL103

DC/DC Converter

SLB03070LR35
SLB08115L140
SLB12400L151

AEM10330
AEM30330
AEM00330

AEM10330 –Solar Energy Harvesting - Buck Boost
AEM30330 –Vibration/RF Energy Harvesting - Buck Boost
AEM00330 –Ambient Energy Manager with Source Voltage Level
Configuration

SLB03070LR35
SLB08115L140
SLB12400L151

SLB03070LR35
SLB08115L140
SLB12400L151

13e-peas14e-peas

AEM10300
AEM30300
AEM00300

AEM10300 –Solar Energy Harvesting - Storage Charger only Buck boost
AEM30300 –Vibration/RF Energy Harvesting - Storage Charger
only - Buck boost
AEM00300 –Ambient Energy Manager - Storage Charger only Buck boost

15e-peas

AEM10941

AEM10941-Solar Energy Harvesting with boost andLDOSLB03070LR35
SLB08115L140
SLB12400L151

16

e-peas

AEM20940

AEM20940 - AmbientThermal energy harvestingBuck boost and LDO

SLB03070LR35
SLB08115L140
SLB12400L151

Small Li-Ion Rechargeable Batteries Technical Notes CAT. 8601

How to use small li-ion rechargeable batteries
The data sheet for each recommended IC are as follows.
○ LTC4079

https://www.analog.com/media/en/technical-documentation/data-sheets/4079f.pdf○ LTM4661

https://www.analog.com/media/en/technical-documentation/data-sheets/LTM4661.pdf○ RE01(with 256KB flash memory)https://www.renesas.com/jp/ja/document/dst/re01-group-256-kb-flash-memory-datasheet?language=en○ RE01(with 1.5MB flash memory)https://www.renesas.com/jp/ja/document/dst/re01-group-products-15-mbyte-flash-memory-datasheet-0?language=en○ R1800

https://www.n-redc.co.jp/en/pdf/datasheet/r1800-ea.pdf○ R1801https://www.n-redc.co.jp/en/pdf/datasheet/r1801-ea.pdf○ RP604

https://www.n-redc.co.jp/en/pdf/datasheet/rp604-ea.pdf○ RP605

https://www.n-redc.co.jp/en/pdf/datasheet/rp605-ea.pdf○ BD99954GW/MWV

https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/battery_management/bd99954xxx-e.pdf○ XC8109https://www.torexsemi.com/file/xc8109/XC8109.pdf○ XC6504https://www.torexsemi.com/file/xc6504/XC6504.pdf○ XC6240https://www.torexsemi.com/file/xc6240/XC6240.pdf○ XC6140C

https://www.torexsemi.com/file/xc6140/XC6140.pdf○ XCL103

https://www.torexsemi.com/file/xcl103/XCL102-103.pdf○ AEM10330

https://e-peas.com/product/aem10330○ AEM30330

https://e-peas.com/product/aem30330○ AEM00330

https://e-peas.com/product/aem00330-ambient-energy-manager-with-source-voltage-level-configuration○ AEM10300

https://e-peas.com/product/aem10300-solar-battery-charger-up-to-7-cells○ AEM30300

https://e-peas.com/product/aem30300-rf-battery-charger○ AEM00300

https://e-peas.com/product/aem00300-ambient-energy-manager-battery-charger○ AEM10941

https://e-peas.com/product/aem10941○ AEM10240

https://e-peas.com/product/aem20940
Small Li-Ion Rechargeable Batteries Technical Notes CAT. 8601