Macnica Launches 1-cell Lithium-ion Battery Protection IC "NB7123 Series" (High-side FET Drive Type)/"NB7130 Series" (Low-side FET Drive Type)

Launch of 1-cell lithium-ion battery protection IC "NB7123 series" (high-side FET drive type) /"NB7130 series" (low-side FET drive type)

- Industry-leading ultra-high accuracy in overcharge detection contributes to further improved safety -

The market for wearable/hearable devices equipped with 1-cell lithium-ion batteries is expanding due to the spread of VR/AR (Virtual Reality/Augmented Reality). In particular, because these devices are used in devices worn directly on the body, safety measures for protection functions to prevent battery fires and other issues are becoming increasingly important, and there is a demand for highly accurate protection voltages.
Meanwhile, conventional protection circuits for single-cell lithium-ion batteries have mainly been configured with a circuit configuration in which the FET is placed on the low side. However, in recent years, due to the diversification of battery cells and ease of communication with the host, an increasing number of devices are adopting protection circuits in which the FET is placed on the high side.
In order to meet these market needs, Nisshinbo Micro Devices will release two types of protection ICs, a high-side FET drive and a low-side FET drive, which further improve safety through ultra-high-precision overcharge detection, thereby expanding our product lineup to be used by a wide range of customers.
In addition to overcharge detection, this product group also boasts industry-leading accuracy in overdischarge detection, discharge overcurrent detection, charge overcurrent detection, load short circuit detection, 0V charge prohibition voltage, and high temperature detection, contributing to the construction of protection circuits that can further improve safety.
In addition, the operating temperature range is -40°C to 105°C, which ensures normal protection even in higher temperature environments than conventional products (-40°C to 85°C).

NB7123: WLCSP-8-ZA2(1.66×1.08×0.38mm)

NB7130: WLCSP-8-ZA1(1.65×0.97×0.40mm)

Features

Industry-leading ultra-high accuracy overcharge detection voltage

Cell detection voltage range:

　　4.3V to 4.7V (NB7123 series)

4.3V to 4.8V (NB7130 series)

25°C accuracy: ±6.5mV

-20°C to 60°C Accuracy: ±8mV

As charging voltages continue to rise, improved accuracy will contribute to improved safety.

Industry-leading high-precision charge/discharge overcurrent and load short circuit detection function

"NB7123 Series"

Discharge overcurrent detection voltage range: 0.006V to 0.040V, Accuracy: ±1.0mV

Charging overcurrent detection voltage range: -0.006V to -0.050V, accuracy: ±1.0mV

Load short circuit detection voltage range: 0.020V to 0.100V, Accuracy: ±1.0mV
"NB7130 Series"

Discharge overcurrent detection voltage range: 0.006V to 0.050V, accuracy: ±0.75mV

Charging overcurrent detection voltage range: -0.006V to -0.050V, accuracy: ±0.75mV

Load short circuit detection voltage range: 0.020V to 0.080V, Accuracy: ±1.0mV

0.081V to 0.125V, accuracy: ±2.0mV

The lower voltage and higher accuracy of overcurrent detection allows the use of lower resistance sense resistors (R _{SENS )}. By reducing the heat generated by the board and the impedance of the battery pack, heat generated during large currents is suppressed, making the thermal design of the board easier.

Highly accurate over-discharge detection voltage

Cell detection voltage range: 2.0V to 3.0V, Accuracy: ±17mV

High accuracy allows the battery capacity to be used close to its minimum limit, helping to extend battery life.

Highly accurate 0V no-charge voltage

Setting range: 1.20V to 2.00V, Accuracy: ±20mV

Charging a 0V battery (low voltage battery) poses the risk of an internal short circuit, so for safety reasons we have achieved a high level of precision in setting the prohibited voltage.

High-precision high-temperature detection

Setting temperature range: 40°C to 85°C, accuracy: ±2°C

Combining it with an external thermistor enables highly accurate temperature detection, contributing to improved safety by accurately protecting the battery pack from abnormal temperatures.

Supports a wide temperature range

Operating ambient temperature range: -40°C to 105°C

By expanding the maximum operating temperature from the previous 85°C to 105°C, normal protection operation is possible even in environments exposed to high temperatures, such as industrial equipment applications.

Ultra-small package

Uses ultra-compact and thin WLCSP package

NB7123：WLCSP-8-ZA2(1.66×1.08×0.38mm)
NB7130：WLCSP-8-ZA1(1.65×0.97×0.40mm)

Main specifications (please refer to the data sheet for details)

Item	NB7123 Series	NB7130 Series
Operating Input Voltage	1.5V to 5.0V (Maximum rating: 6.5V)	1.5V to 5.0V (maximum rating: 12V)
Operating Ambient Temperature	-40°C to 105°C	-40°C to 105°C
current consumption	Typ. 7.0µA (during normal operation)	Typ. 3.0µA (during normal operation)
Standby Current	Max. 0.04µA	Max. 0.04µA
Overcharge detection voltage	4.3V to 4.7V, accuracy: ±6.5mV	4.3V to 4.8V, accuracy: ±6.5mV
Over-discharge detection voltage	2.0V to 3.0V, accuracy: ±17mV	2.0V to 3.0V, accuracy: ±17mV
Discharge overcurrent detection voltage	0.006V to 0.040V, accuracy: ±1.0mV	0.006V to 0.050V, accuracy: ±0.75mV
Charging overcurrent detection voltage	-0.006V to -0.050V, accuracy: ±1.0mV	-0.006V to -0.050V, accuracy: ±0.75mV
Short circuit detection voltage	0.020V to 0.100V, accuracy: ±1.0mV	0.020V to 0.080V, accuracy: ±1.0mV 0.081V to 0.125V, accuracy: ±2.0mV
0V no-charge voltage	1.2V to 2.0V, accuracy: ±20mV	1.2V to 2.0V, accuracy: ±20mV
High temperature detection	40°C to 85°C, accuracy: ±2°C	40°C to 85°C, accuracy: ±2°C