Post Date : Mar 09, 2023 / Last updated : Oct 11, 2023
LTO batteries using lithium titanium oxide (LTO) batteries have recently come on the scene and are being widely considered.
Conventional Li-ion / Polymer secondary batteries have complex charging control making them difficult to handle, so a careful study must be made of their reliability and protective circuits.
LTO batteries are a new type of secondary battery that are very safe and have many advantages, such as simple and quick charging using LDO and simple over-discharging protection using a RESET IC.
LTO battery features
- Constant voltage charging using LDO is possible.
A dedicated and expensive CC/CV/charging completion control IC is not necessary. - Highly reliable and safe. Long-lasting and good at withstanding repeated charging.
- Resistant to over-discharging. Simple voltage drop detection is sufficient.
- Voltage is constant between 2.1 – 2.4V.
Energy is easier to draw out than with Supercap (EDLC).
Small charging/voltage monitoring circuits can be easily configured using any manufacturer’s LTO battery and an LDO and RESET IC.
LDO for LTO battery charging: XC6240, XC6242
- Max. 2.70V charging voltage, including the temperature range, to match the LTO battery specifications.
- Designed to reduce discharge current 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.
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.
| Block | Product | Features |
|---|---|---|
| (1)Charging LDO | XC6240 | For LTO charging, 2.63V, 150mA |
| XC6342 | Supports 105℃, for LTO charging, 2.63V, 150mA | |
| (2)Battery voltage monitoring | XC6140 | LTO battery voltage monitoring IC Detect voltage 1.6-2.2V, release voltage = 2.475V, Iq=104nA |
| XC6142 | Supports 105℃, LTO battery voltage monitoring IC Detect voltage 1.6-2.1V, release voltage = 2.450V, Iq=104nA |
List of reference circuits for LTO batteries
→NGK INSULATORS, LTD “EnerCera” ET Series reference circuits