ISL9211B

Charging System Safety Circuit

Product Status: 量産中

OVERVIEW

The ISL9211B is an integrated circuit (IC) optimized to provide a redundant safety protection to a Li-ion battery charging system. The IC monitors input voltage, battery voltage, and charge current. When any of these parameters exceeds its limit, the IC turns off an internal N-channel MOSFET to remove power from the charging system to the battery. The IC also monitors its own internal temperature and turns off the N-channel MOSFET when the temperature exceeds +150°C. Together with the battery charger IC and the protection module in a battery pack, the charging system using the ISL9211B has triple-level protection and is two-fault tolerant.

The IC is designed to turn on the internal NFET slowly, to avoid in-rush current at
power-up. It turns off the NFET quickly when the input is overvoltage, to remove power before damage occurs. The ISL9211B has a logic flag output to indicate a fault condition. The enable input allows the system to cut off the input power, if needed.

KEY FEATURES

  • 24V Max Input Voltage
  • Supports Up To 2.0A Input Current
  • Fully Integrated Protection Circuit for Three Protected Variables
  • High Accuracy Protection Thresholds
  • User Programmable Overcurrent Protection Threshold
  • Responds to Input Overvoltage in Less Than 1µs
  • High Immunity of False Triggering Under Transients
  • Fault Indication for Various Fault Occurrence
  • Easy to Use
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL9211B
Basic Information
Production Status
量産中
プログラマブル過電流範囲 (A)
0 to 2.0
入力過電圧保護 (Typ.)
5.8 V
バッテリ過電圧保護 (Typ.)
4.34 V
バッテリリーク電流
20nA max @ 4.34VVB
バッテリ過電圧保護 (min)
4.25 V
バッテリ過電圧保護 (max)
4.4 V
入力過電圧保護 (min)
5.6 V
入力過電圧保護 (max)
6 V
プログラマブル過電流 (max)
2 A
Ron @ 500mA (Typ.)
170 mΩ
Ron @ 500mA (max)
280 mΩ
認定レベル
Standard
バッテリ過電圧保護
4.34 typ, 4.25 min, 4.4 max
入力過電圧保護
5.8 typ, 5.6 min, 6.0 max
Ron @ 500 mA
170 typ, 280 max
温度範囲
-40 to +85

ブロック図

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