ISL9211B

Charging System Safety Circuit

Product Status: Mass Production

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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9211B
Basic Information
生产状态
Mass Production
可编程过流范围 (A)
0 to 2.0
输入过压保护典型值
5.8 V
电池过压保护典型值
4.34 V
电池泄漏
20nA max @ 4.34VVB
电池过压保护最小值
4.25 V
电池过压保护最大值
4.4 V
输入过压保护最小值
5.6 V
输入过压保护最大值
6 V
可编程过流 (最大值)
2 A
500mA时的Ron (典型值)
170 mΩ
500mA时的Ron (最大值)
280 mΩ
资质级别
Standard
电池过压保护
4.34 typ, 4.25 min, 4.4 max
输入过压保护
5.8 typ, 5.6 min, 6.0 max
500 mA时的Ron
170 typ, 280 max
温度范围
-40 to +85

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