ABLIC launches the S-821A/1B Series of 1-cell battery protection ICs

1-cell lithium-ion batteries are used in a wide variety of applications, including smartphones, wearable devices, and other IT devices. There has been a growing trend towards the use of higher capacity lithium-ion batteries in recent years, such as in the UK, as smartphones have become more high performance, and this has in turn resulted in an increase in lithium-ion batteries which use metal casings as they provide more battery capacity per unit volume than conventional insulated battery types. The metal casings serve as negative electrode potential for the batteries, so protection measures are required to isolate the battery's positive side current path (high side protection) in order to achieve short-circuit protection for the battery's output terminal.

The S-821A/1B Series launched is a protection IC for 1-cell lithium-ion batteries with the following features:

• Protective measures which isolate the current path of the battery's positive side by placing an Nch MOSFET which carries out charge-discharge control at the positive side (high side) of the lithium-ion battery and also contributes to simpler system design by making the ground levels of the battery pack and the system the same, and a built-in, industry top-class triple boost charge pump for high Nch MOSFET drive voltage and reduced Nch MOSFET on resistance.
• 3 levels of discharge overcurrent protection with the industry's top-class level of accuracy that can isolate abnormal current in safe areas.
• Industry top-class overcharge detection voltage accuracy of ±15mV.
• A power-saving function which can disable discharge from the battery while reducing the protection IC current consumption to a maximum of 50nA to minimise current consumed by the battery to as close to 0 as possible.
• The ability to configure an overheat protection function by connecting the NTC thermistor to the thermistor connection pin (TH pin).

These features provide benefits including strengthening safety countermeasures against battery combustion and other risks and minimising loss of remaining capacity during storage in order to greatly contribute to the improvement of overall device safety and ease of use.

Going forward, ABLIC will continue to develop lithium-ion battery protection ICs with even greater accuracy and higher performance and release products for applications in a wide range of fields.

Major specifications

• Overcharge detection voltage: 3.50 to 4.80V ±15mV
• Overdischarge detection voltage: 2.00 to 3.00V ±50mV
• Discharge overcurrent 1 detection voltage: -3ｍV to -100mV ±1mV (S-821A Series), -3mV to -100mV ±0.75mV (S-821B Series)
• Discharge overcurrent 2 detection voltage: -6mV to -100mV ±3mV (S-821A Series), -6mV to -100mV ±2mV (S-821B Series)
• Load short-circuiting detection voltage: -20mV to -100mV ±5mV (S-821A Series), -20mV to -100mV ±4mV (S-821B Series)
• Charge overcurrent detection voltage: 3ｍV to 100mV ±1mV (S-821A Series), 3mV to 100mV ±0.75mV (S-821B Series)
• Charging of 0V batteries (allowed, prohibited)
• Current consumption during operation: 6.0µA typ.
• Current consumption during power-down: 50nA max.
• Current consumption during power-saving: 50nA max.
• Max rating: 28V
• Operating temperature: -40 to 85°C
• Packages: SNT-8A 1.97×2.46×t0.5mm max., WLP-8V 1.08×1.52×t0.35mm max.