When fast charging occurs, as the charge current increases, it becomes difficult to accurately monitor the battery voltage due to the current detection resistance and the FET on-resistance.
The S-82L1/T1/U1/V1 series with the industry’s first* alarm function (AO pin) can monitor the voltage between VDD and VSS with a high accuracy of ±12mV, which is less affected by these resistance, and alarm signal can be output to the charge control circuit. This allows the charge control circuit to accurately detect the battery voltage without using an AD converter, instinctively adjusting the amount of current and charge voltage.
This IC supports safe, highly efficient fast charging, contributing to an improved device safety level and longer battery life.

*As a 1-cell battery protection IC.
Based on our research as of November 2022

The charge control circuit charges the battery at a constant current until an alarm signal is outputted, and then subsequently decreases the charge current in accordance with the alarm signal. When the charge current is lowered, the battery voltage drops, stopping the alarm signal, and the battery will continue to charge until the alarm signal is outputted again.
By operating this method of control, the battery voltage can be accurately detected without the use of an AD converter, and can be safely charged to full capacity in a short time.

It is imperative that Lithium-ion batteries are inhibited from charging outside the recommended temperature range, therefore charge control circuits are generally equipped with a temperature monitoring function. The alarm function can be used to control the charge voltage according to temperature levels without the use of an AD converter; this enables friendly charging that is safe, and prevents battery degradation.

The S-82L1/T1/U1/V1 series offers the industry’s top class* overcharge detection voltage accuracy of ±12mV.
It maximizes battery performance by improving charge capacity and usage time while still ensuring battery pack safety.
Use of a SNT-6A(1.57 x 1.8 x t0.5 (max.) mm)
and HSNT-8(1616)(1.6 x 1.6 x t0.4 (max.) mm),
the industry’s smallest class of package*, has significantly reduced the size of the protection circuit board.

*As a 1-cell battery protection IC.
Based on our research as of November 2022

The S-82V1 series offers the industry’s top class* charge/discharge overcurrent detection voltage accuracy of ±0.75mV.
This reduces variation in overcurrent detection while lowering resistance in current detection resistance. This enables the possibility to suppress heat generation in the protection circuit board even as the charge current increases.

*As a 1-cell battery protection IC.
Based on our research as of November 2022