Resettable over-temperature protection devices boost LiP
LITTELFUSE MHP–TAC Metal Hybrid PPTC – thermal activated compact resettable over-temperature protection devices connect a PPTC (Polymeric Positive Temperature Coefficient) device in parallel with a bimetal protector (a resettable thermal cut-off device) to protect the high-capacity lithium-ion polymer (LiP) and prismatic battery cells used in mobile devices and consumer electronics from damage caused by overheating and overcurrents. In normal operation, current passes through the bimetal contact because of its low contact resistance. During an abnormal event, the device reacts to the rise in cell temperature, causing the bimetal contact to open at the specified temperature and its contact resistance to increase.
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