ISL9209C

Charging System Safety Circuit

OVERVIEW

The ISL9209C is an integrated circuit (IC) optimized to provide a redundant safety protection to a Li-ion battery from failures of a charging system. The IC monitors the input voltage, the battery voltage, and the charge current. When any of the three parameters exceeds its limit, the IC turns off an internal P-Channel MOSFET to remove the power from the charging system. In addition to the above protected parameters, the IC also monitors its own internal temperature and turns off the P-Channel MOSFET when the temperature exceeds +140°C. Together with the battery charger IC and the protection module in a battery pack, the charging system using the ISL9209C has triple-level protection and is two-fault tolerant.

The IC is designed to turn on the internal PFET slowly to avoid in-rush current at power-up but will turn off the PFET quickly when the input is overvoltage in order to remove the power before any damage occurs. The ISL9209C has a logic warning output to indicate the fault and an enable input to allow the system to remove the input power.

KEY FEATURES

  • Fully Integrated Protection Circuit for Three Protected Variables
  • High Accuracy Protection Thresholds
  • User Programmable Overcurrent Protection Threshold
  • Input Overvoltage Protection in Less Than 1µs
  • High Immunity of False Triggering Under Transients
  • Warning Output to Indicate the Occurrence of Faults
  • Enable Input
  • Easy to Use
  • Thermal Enhanced TDFN Package
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9209C
Basic Information
生产状态
Mass Production
可编程过流范围 (A)
0 to 1.5
输入过压保护典型值
5.58 V
电池过压保护典型值
4.34 V
电池泄漏
20nA max @ 4.4VVB
电池过压保护最小值
4.28 V
电池过压保护最大值
4.4 V
输入过压保护最小值
5.65 V
输入过压保护最大值
6 V
可编程过流 (最大值)
1.5 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, 4.28 min, 4.4 max
输入过压保护
5.58 typ, 5.65 min, 6.0 max
500 mA时的Ron
170 typ, 280 max
CAN 采样
YES
温度范围
-40 to +85

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