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New Product: R5651 Series, Protection IC for 3-to-5-cell Li-ion Batteries

Nisshinbo Micro Devices Inc. has launched the R5651 series, a 3-to-5-cell Li-ion battery protection IC.

Feb 24, 2022

Battery protective functions are getting more important to ensure the safety of applications using Li-ion batteries such as power tools, cleaners, electrically assisted bikes, e-bikes, drones, storage batteries, etc.

The new multi-cell battery protection IC has many features helping users simplify their manufacturing process.

First, it reduces heat generation at large current by using a low-resistance SENSE resistor, making thermal design of a board easy.

Second, separating the charge and discharge paths enables using a battery pack with low impedance.

Third, thanks to the high-voltage cell monitor pins, there are no constraints on connection orders. Fourth, although the IC is designed for three-to-five-cell battery packs, it can also correspond to battery packs including six or more cells by connecting two or more ICs in cascade. The simple cascading structure contributes to reducing external components.

Additionally, the IC adopts the small TSSOP-24 package.

The R5651 series will strengthen your products' competitive edge by achieving high accuracy and low power consumption.

Product Name R5651 Series
Sample Price JPY 550 (Tax Included / 1,000 pcs)
Sample Order Start Date February 24, 2022
Package TSSOP-24 (7.8×6.4×0.9 mm)
Monthly Production 1 million



1. Industry-leading High-accuracy Overcharge Detection (OVP)
    Overcharge detection voltage range: 3.60 V to 4.50 V, Accuracy: ±25 mV
2. Industry-leading High-accuracy Over discharge Detection (UVP)
    Over discharge detection voltage range: 2.0 V to 3.2 V, Accuracy: ±50 mV
3. Highest Level of Low Voltage and High Accuracy We Ever Achieved by
    Lowering Resistance of Current Sense Resistor
    Discharge overcurrent detection voltage accuracy: 10 mV to 30 mV, ±3 mV
    Charge overcurrent detection voltage accuracy: -8 mV to -30 mV, ±3 mV
4. Temperature Protection: Industry-leading High Accuracy of ±3°C
    Charge Low (TDCL) setting: -5 / -3 / 0 °C, Accuracy: ±3°C
    Charge High (TDCH) setting: 45 / 50 / 55 / 60 °C, Accuracy: ±3°C
    Discharge High (TDDH) setting: 65 / 70 / 75 °C, Accuracy: ±3°C
5. High-voltage Cell Monitor Pins
    Contributes to simplifying circuit connection by removing connection orders.
6. Cascade Connection
    Can correspond to six- or more-cell batteries by connecting two in cascade.
7. Package
    Adopts TSSOP-24 (7.8 × 6.4 × 0.9 mm), a small package with leads.
    Features high durability and is resistible to vibrations generated from power tools.

Key Specifications


R5651 Series

Absolute Maximum Ratings (VDD, VCx) 30 V
Consumption Current Typ. 13 μA (at normal mode)
Standby Current  6.0 μA (Typ)
OVP Detection Voltage Range 3.6 to 4.5 V
OVP Detection Voltage Accuracy ±25 mV
UVP Detection Voltage Range 2.0 to 3.2 V
UVP Detection Voltage Accuracy ±50 mV
Number of Cells 3 to 5 Cells


Availability and Pricing
Availability and pricing info please visit email:

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 strength-ening 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 con-nected society, and aim to be a company with value and presence that is expected by customers around the world.

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