镍氢、镍镉充电控制专用IC MC33340-D资料
镍氢、镍镉充电控制专用IC MC33340-D资料<br>The MC33340 and MC33342 are monolithic control IC’s that are<br>specifically designed as fast charge controllers for Nickel Cadmium<br>(NiCd) and Nickel Metal Hydride (NiMH) batteries. These devices<br>feature negative slope voltage detection as the primary means for fast<br>charge termination. Accurate detection is ensured by an output that<br>momentarily interrupts the charge current for precise voltage<br>sampling. An additional secondary backup termination method can be<br>selected that consists of either a programmable time or temperature<br>limit. Protective features include battery over and undervoltage<br>detection, latched over temperature detection, and power supply input<br>undervoltage lockout with hysteresis. Fast charge holdoff time is the<br>only difference between the MC33340 and the MC33342. The<br>MC33340 has a typical holdoff time of 177 seconds and the MC33342<br>has a typical holdoff time of 708 seconds.<br>• Negative Slope Voltage Detection with 4.0 mV Sensitivity<br>• Accurate Zero Current Battery Voltage Sensing<br>• High Noise Immunity with Synchronous VFC/Logic<br>• Programmable 1 to 4 Hour Fast Charge Time Limit<br>• Programmable Over/Under Temperature Detection<br>• Battery Over and Undervoltage Fast Charge Protection<br>• Power Supply Input Undervoltage Lockout with Hysteresis<br>• Operating Voltage Range of 3.25 V to 18 V<br>• 177 seconds Fast Change Hold–off Time (MC33340)<br>• 708 seconds Fast Change Hold–off Time (MC33342)
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