Nisshinbo Micro Devices NB7200

The NB7200 Series is a two-cell Li-ion/Li-polymer battery protection IC designed to safeguard packs in space-constrained consumer and portable industrial designs. It integrates overcharge and overdischarge voltage detection, and charge/discharge overcurrent protection. At the heart of the NB7200 is a precision current monitor that enables discharge overcurrent detection accuracy of ±1.0 mV (V_DET31), complemented by a selectable second-level discharge overcurrent threshold (V_DET32) and short-circuit detection. Typical supply current is just 2 μA with a maximum of 4 μA, and standby current is capped at 0.2 μA on auto-release variants—figures that directly translate into longer shelf and operating life for battery-powered products. These specifications, alongside wide, finely stepped threshold ranges. The industry-class detection precision helps the engineer to design a highly accurate protection circuit. It also accepts the use of a small current sense resistor value, which is convenient to reduce heat dissipation at high currents.

Key features

• Supply current:
  • Normal mode: Typ. 2 µA / Max. 4 µA
  • Standby mode: Max. 0.2 µA  (V_DET2: Auto release type) 
• Overcharge detection voltage (V_DET1):  4.2 V to 4.8 V, ±15 mV 
• Overdischarge detection voltage (V_DET2):  2.0 V to 3.2 V, ±35 mV  
• Discharge overcurrent detection voltage 1 (V_DET31):  0.0030 V to 0.0300 V, ±1.0 mV 
• Discharge overcurrent detection voltage 2 (V_DET32):  0.010 V to 0.090 V,  ±2 mV (0.010 V to 0.040 V) / ±5% (0.040 V to 0.050 V) / ±2.5 mV (0.050 V to 0.090 V) 
• Charge overcurrent detection voltage (V_DET4):  –0.0030 V to –0.0300 V, ±1.0 mV 
• Short-circuit detection voltage (V_SHORT): 0.020 V to 0.100 V, ±4 mV 
• 0 V Battery charging selectable: Permission / Inhibition 
• 0 V battery charging Inhibition Voltage (V_NOCHG):  1.000 V to 1.500 V 

Applications

• Tablet PC
• DSLR and mirrorless digital cameras
• Remote controled hobby gear.
• Drones
• Two way radios
• Barcode scanners