Two 1-cell Li-Ion battery protection ICs with unique new functions
Nisshinbo Micro Devices Inc. has started production of the NB7140 & NB7141 targeted for small wearable devices such as earbuds, hearing aids or other health applications
The NB7140 / NB7141 1-cell battery protection ICs are remarkable products in a tiny WLCSP-8-P10 package with unique new functions increasing the reliability level and shelf-lifetime of the application.
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1. World’s First Product with Built-in Watchdog Timer (NB7141)
Incorporating a watchdog timer allows external monitoring of a microcontroller in case of an uncontrolled operation. This eliminates the need for additional dedicated ICs and reduces the mounting area. Compared to a watchdog timer built into a microcontroller, it can ensure more safety, as there is no risk of the watchdog timer and the microcontroller failing due to a common cause.
2. Forced Reset Function (NB7140)
The RST (reset) terminal allows the charging and discharging FETs to be switched off, allowing easy leakage testing of the protection circuit. Moreover, the use of the RST terminal makes it possible to shut down the system power supply by switching off the FETs when a microcontroller is out of control. This improves system stability.
NB7140 Datasheet NB7141 Datasheet
3. Industry-leading High-accuracy Two-step Discharge Overcurrent Detection
Discharge overcurrent detection voltage 1:
0.005 V to 0.030 V, Accuracy: ±1.0 mV, 0.0305 V to 0.050 V, Accuracy: ±1.5 mV
Discharge overcurrent detection voltage 2:
0.011 V to 0.060 V, Accuracy: ±2.0 mV, 0.0605 V to 0.100 V, Accuracy: ±4.0%
The low voltage and higher accuracy of the overcurrent detection allow using a low resistance sense resistor. This reduces the impedance of a battery pack, thereby reducing the heat generation at high currents and simplifying the thermal design of a board.
4. Industry-leading High-accuracy Overcharge Detection
Detection voltage range: 4.2 V to 4.7 V, Accuracy: ±15 mV
The improved accuracy contributes to strengthening safety in the trend of charging voltage increase.
5. Industry-leading High-accuracy Overdischarge Detection
Detection voltage range: 2.1 V to 3.2 V, Accuracy: ±35 mV
This contributes to longer battery life by allowing the remaining battery charge to be used as close to an allowable value as possible.
6. Industry-leading Low Supply Current
(Normal Mode)
NB7140: Typ. 1.5 μA / Max. 3.0 μA (25% improvement vs our conventional product)
NB7141: Typ. 2.0 μA / Max. 4.0 μA
(Standby Mode)
Max. 0.04 μA (Overdischarge detection latch type),
Max. 0.20 μA (Overdischarge detection auto release type)
A long operating time of applications is achieved thanks to low supply current at normal mode and standby mode.
7. High-accuracy 0 V Battery Charging Inhibition Voltage
Setting range: 1.0 V to 2.5 V, Accuracy: ±4.0%
Since charging 0 V batteries (low-voltage batteries) may cause an internal short circuit, it is possible to finetune the settings of the inhibition voltage from a safety viewpoint.
8. Forced Standby Function
The STB (standby) terminal makes it possible to enter forced standby mode without putting batteries into overdischarge state, which reduces current consumption significantly until a charger is connected. This makes it possible to minimize the level of discharge during warehouse storage periods prior to product shipment.
9. Package
The ultra-thin, ultra-small leadless WLCSP-8-P10 package (1.6 × 1.0 × 0.3 mm) is most suitable for small portable devices.
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