New Products: 1-cell Li-ion Battery Protection ICs, NB7141 Se-ries, World’s First Product with Built-in Watchdog Timer, and NB7140 Series, Product with Forced Reset Function

Devices that use 1-cell Li-ion batteries, such as wearable/hearable devices, hearing aids, and health devices, have a growing market due to the proliferation of VR/AR (Virtual Reality/Augmented Reality) devices and increasing health awareness. Furthermore, demands for safety improvement are increasing as people wear those devices directly, and safety measures are also becoming more important for the protection functions of batteries.

These two new products feature industry-leading high-accuracy overcharge, overdischarge, and discharge overcurrent detection functions for 1-cell batteries, as well as a forced standby function. In addition, 0 V battery charging inhibition voltage of the two new ICs is configurable more flexibly than that of conventional ones. Furthermore, the NB7140 series has a forced reset function, and the NB7141 series is the world’s first 1-cell protection IC equipped with a watchdog timer function. They contribute to the competitiveness of customers‘ Li-ion battery applications with high accuracy, low consumption, improved safety, and small dimensions.

Features

1. World’s First Product with Built-in Watchdog Timer (NB7141)

Incorporating a watchdog timer makes it possible to externally monitor a microcontroller in case of uncontrolled operation. This eliminates the need for additional specialized ICs and reduces mounting area. Compared to a watchdog timer embedded in a microcontroller, it can ensure more safety because there is no risk of watchdog timer malfunction due to common causes with the microcontroller.

2. Forced Reset Function (NB7140)

Using the RST (reset) terminal enables to turn off the charge and the discharge FETs, which makes the leak test of the protection circuit easily. Additionally, installing the RST terminal allows the system power supply to be cut off by turning off the FETs when a microcontroller runs out of control, which can reset the power supply to the microcontroller. This improves the stability of the system.

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 allows using a sense resistor with low resistance. 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 enabling 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 compared to 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 can meet the demand for detailed 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 battery loss during inventory periods prior to product shipment.

9. Package

An ultra-thin, ultra-small and leadless package WLCSP-8-P10 (1.6 × 1.0 × 0.3 mm) is adopted.

Main Specifications

Availability and Pricing

Fore more information availability and pricing please visit email: sales.europe@macnica.com.

About Nisshinbo Micro Devices Inc.

Nisshinbo Micro Devices Inc. is the result of the integration of former New Japan Radio Co., Ltd. and former RICOH Electronic Devices Co., Ltd. Both companies, having contributed to expanding the Nisshinbo Group’s microdevices business so far, will further grow as an "Analog Solution Provider" for growing markets by strengthening our structure and achieving synergies through business integration.

Nisshinbo Micro Devices will provide analog solutions through electronic devices and microwave products based on the strength of analog technology in accordance with the Nisshinbo Group’s corporate philosophy of "Change and Challenge! For the creation of the future of Earth and People". We will contribute to developing connected society, and aim to be a company with value and presence that is expected by customers around the world.

For more information, go to https://www.nisshinbo-microdevices.co.jp/en/.

Über die Macnica ATD Europe GmbH

Macnica’s ATD Europe GmbH, (former Macnica GmbH), was originally established in the UK in 2006, and moved to Germany in July 2008, to increase efficacy of its service for European customers.

By it’s acquisition of the Munich based company Scantec Mikroelektronik in 2014 Macnica Europe formed a powerful semiconductor distribution with headquarter in Ingolstadt and offices in Munich, Regensburg, Milton Keynes (UK) and Warsaw offering an attractive and competitive portfolio of highly sophisticated devices.

Macnica provides end to end support from design-in to production through its global service network to its customers, regardless of the final destination of the product shipment to customers‘ manufacturing locations.

About Macnica ATD Europe S.A.S.

Founded in 1990 as ATD Electronique, Macnica ATD Europe headquarter offers innovative components dedicated to imaging applications for the European market. Its product portfolio includes: image sensors (CCD, CMOS, InGaAs, Thermal etc.), optics, interface circuits, FPGA & IPs, imaging processors, cables and OLED microdisplays.

It also covers development tools and design services enabling fast and efficient realization of new high-performance camera systems for markets such as machine vision, medical, life sciences, surveillance, automotive and others. After the acquisition of the company by Macnica Inc. as of October 1, 2020 the company operates under the name Macnica ATD Europe.

About Macnica, Inc.

Macnica was established in 1972 as a semiconductor distribution company headquartered in Yokohama, Japan, and has over 85 sales offices worldwide in eastern Asia, Europe and the USA. Total number of employees is over 3,900 and its consolidated revenue for fiscal 2021 was approximately US$ 7.6 B.

Macnica is famous for having an excellent engineering team of more than 900 application support engineers, IC designers and software developers with strong focus on providing technical support for its customers including custom design services. Macnica is continuing to extend its presence globally by having successful partners in strategic areas in the electronics market.

Firmenkontakt und Herausgeber der Meldung:

Macnica ATD Europe GmbH
Nürnberger Str. 34
85055 Ingolstadt
Telefon: +49 (841) 88198-0
Telefax: +49 (841) 88198199
http://www.macnica.eu/de

Ansprechpartner:
Josef Sigl
Marketing
Telefon: +49 (89) 899143-15
Fax: +49 (89) 899143-17
E-Mail: josef.sigl@macnica.com
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