Nisshinbo Micro Devices

R5449Z One-Cell Li-Ion Battery Protection IC

Nisshinbo Micro Devices’ Li-Ion battery protection IC is ideal for high-side N-channel MOSFETs and temperature monitoring

Image of Nisshinbo's R5449Z One-Cell Li-Ion Battery Protection ICNisshinbo Micro Devices’ R5449Z one-cell Li-ion/polymer battery protection IC provides detector circuits for overcharge, overdischarge, discharge/charge overcurrent, and temperature. The IC can drive external high-side N-channel MOSFETs, providing high-accuracy detection at overcharge and overcurrent and a high-accuracy charge inhibition for a 0 V battery. The R5449 IC can reduce the supply current to a minimum after overdischarge detection by turning off the internal circuits. The additional CTL pin can force the IC into standby mode.

Features
  • Absolute maximum rating: 6.5 V
  • Supply current normal mode: 5.0 μA typ.
  • Standby current: 0.04 μA max.
  • Package: WLCSP-8-P8 (1.50 mm x 1.08 mm x 0.34 mm)
  • Detector selectable range and accuracy:
    • Overcharge detection voltage: 4.2 V to 4.6 V (in 0.005 V step, ±10 mV)
    • Overdischarge detection voltage (VDET2): 2.0 V to 3.4 V (in 0.005 V step, ±35 mV)
    • Discharge overcurrent detection voltage (VDET3): 0.012 V to 0.150 V (in 0.001 V step)
    • Charge overcurrent detection voltage: -0.150 V to -0.012 V (in 0.001 V step)
    • Short-circuit detection voltage (VSHORT): 0.032 V to 0.200 V (in 0.005 V step, ±3 mV)
    • VSHORT configurable range varies depending on a set value for VDET3
    • 0 V battery charge Inhibition voltage: 1.25 V to 2.00 V (in 0.05 V step, ±50 mV)
    • Thermal detection temperature: +40°C to +85°C (in +5°C step, ±3°C)
  • Internal fixed output delay time:
    • Overcharge detection delay time: 1024 ms/2048 ms/3072 ms/4096 ms
    • Overdischarge detection delay time: 16 ms/32 ms/128 ms
    • Discharge overcurrent detection delay time: 32 ms/128 ms/256 ms/512 ms/1024 ms
    • Short-circuit detection delay time: 280 μs
    • Charge overcurrent detection delay time: 8 ms
    • Thermal detection delay time: 128 ms/512 ms/1024 ms/4096 ms
  • Optional functions:
    • Charge overcurrent detection: Enabled/disabled
    • 0 V battery charging: Inhibition
    • Overcurrent detection: High-side (RSENS to V+)
    • Thermal protection: Charge and discharge current
    • External NTC thermistor: 100 kΩ/470 kΩ
    • Temperature monitoring cycle:
      • Non-sense time (TTNS): 90 ms/528 ms/1040 ms
      • Sense time (TTS): 10 ms
    • Current sense: Resistor/FET
Applications
  • Li-ion protection ICs for battery packs
  • Smartphones
  • Electronic gadgets
Published: 2024-05-07