Post Date : Mar 09, 2023 / Last updated : Apr 14, 2025
These are the NGK INSULATORS, LTD “EnerCera” ET Series reference circuits.
“EnerCera” ET Series features
- Constant voltage changing is possible, charging IC not required
- High-speed charging
- Expected life of 10 years
- Small, slim, coin-shaped secondary battery that can also be used in 105℃ environments
- Can be mounted on a circuit board using reflow solder.
- Bend-resistant ultra-thin battery
- Supports hot lamination processing, which is the standard manufacturing method for cards.
Lineup
| Type | Coin | Pouch | |
|---|---|---|---|
| Part No. | ET2016C-R | ET2016C-H | ET382704P-Hr |
| Size(Φ) | 20mm | 12.5mm | 38mm × 27mm |
| Height (including terminals) | 2.05mm | 1.3mm | 0.45mm |
| Nominal capacity | 25mAh | 4mAh | 20mAh |
| Nominal voltage | 2.3V | ||
| Charging method | Constant voltage (CV) charging
(Current limiting not required) | ||
| Discharge peak current (reference) | 60mA | 20mA | 300mA |
| Temperature range | -40℃~70℃ | -20℃~105℃ | -40℃~70℃ |
| Heatproof temperature (mounted) | (Reflow solder use not supported) | (Supports reflow solder use) | (Hot lamination) |
Reference circuit/evaluation circuit board
Evaluation circuit board
Circuit diagram
BOM
| Block | Product | Features |
|---|---|---|
| (1)Charging LDO | XC6240A263xR-G | For LTO charging, 2.63V, 150mA |
| XC6242A2637R-G | Supports 105℃, for LTO charging, 2.63V, 150mA | |
| (2)Battery voltage monitoring | XC6140C20AxR-G | LTO battery voltage monitoring IC Detect voltage 2.0V, release voltage = 2.475V, Iq=104nA |
| XC6142C20A9R-G | Supports 105℃, LTO battery voltage monitoring IC Detect voltage 2.0V, release voltage = 2.450V, Iq=104nA | |
| SBD | XBS024S15R-G | For counter-current prevention, 200mA 40V, low IR |
| CIN | 10V/1μF | Input capacitor for charging LDO |
| CL | 10V/1μF | Output capacitor for charging LDO |
| R | 100kΩ | Pull-down resistor |
(1) LDO for LTO battery charging: XC6240, XC6242
- Max. 2.70V charging voltage, including the temperature range, to match the LTO battery specifications.
- Designed to hold down the current discharged from the battery.
- Supports LTO batteries that support high-temperature operation (XC6242: 105℃)
- h = 0.33 low-profile package that can also support thin-package solutions.
(2) Battery voltage monitor: XC6140, XC6142
- Optimum detect voltage for over-discharge protection of LTO batteries.
- Release voltage is released when charging starts.
- Broad hysteresis range that can output a stable signal even when using LTO batteries with a high internal impedance.
- Ultra-low power-consuming current that keeps down the discharge current from the battery.
- Supports LTO batteries that support high-temperature operation (XC6142: 105℃).
- h = 0.33 low-profile package that can also support thin-package solutions.