NB7200 Series, 2-cell Li-ion Battery Protection IC

NISD has launched the NB7200 Series, a 2-cell Li-ion battery protection IC.

Applications using 2-cell Li-ion batteries have been mainly such as digital cameras, portable DVDs, tablet PCs, intercoms, and these days they are increasing in such as electrically assisted bicycles, beauty and health equipment, toys, small power tools, cleaners. Smartphones have been mostly 1-cell models until recently, and 2-cell models are also now available due to the need for high-capacity and rapid charging.

The NB7200 series features the industry-leading high-accuracy overcharge, overdischarge, and discharge overcurrent detection for 2-cell battery applications, as well as improved current detection accuracy by using an external resistor. In addition, a small package DFN1616-8 (1.6 x 1.6 x 0.4 mm) is adopted. The high accuracy, low power consumption, and space-saving design will help customers improve the competitiveness of their Li-ion battery applications.

NB7200 series (DFN1616-8-GM package)

1. Industry-leading High-accuracy Overcharge Detection (OVP) (25% improvement compared to our conventional product)

Overcharge detection voltage range of each cell: 4.2 V to 4.8V, Accuracy: ±15 mV
The improved accuracy contributes to strengthening safety in the trend of charging voltage increase.

2. Industry-leading High-accuracy Overdischarge Detection (UVP) (30% improvement compared to our conventional product)

Overdischarge detection voltage range of each cell: 2.0 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.

3. Industry-leading High-accuracy Two-step Discharge Overcurrent Detection

1.Voltage range: 0.003 V to 0.030 V, Accuracy: ±1 mV
2.Voltage range: 0.010 V to 0.040 V, Accuracy: ±2 mV,0.040 V to 0.050 V, Accuracy: ±5%,0.050 V to 0.090 V, Accuracy: ±2.5 mV
 
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. Low Supply Current

(Normal Mode) Typ. 2.0 µA / Max. 4.0 µA
(Standby Mode) Max. 0.2 μA (Auto release type)
A longer operating time of applications is achieved thanks to low consumption current at normal mode and low standby current.

5. Industry-leading High-accuracy Short-circuit Detection Voltage (30% improvement compared to our conventional product)

Voltage range: 0.020 V to 0.100 V, Accuracy: ±4 mV
This feature contributes to strengthening safety of applications.

6. High-accuracy 0 V battery Charging Inhibition Voltage

Voltage range: 1.0 V to 1.5 V, Step: 50 mV, Accuracy: ±0.1 V
This makes it possible to meet fine requirements.

7. Adoption of Sense Resistor

The NB7200 series is our first 2-cell Li-ion battery protection IC that adopts the overcurrent detection with an external resistor. Thanks to the feature, the new product achieves higher accuracy of current detection compared to conventional FET-sensing models, even with temperature characteristics considered.

8. Package

A leadless and ultra-small package, DFN1616-8-GM (1.6 × 1.6 × 0.4 mm) is adopted.

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