MHP-TA15-9-77 Littelfuse

Product Overview Metal Hybrid PPTC Devices with Thermal Activation (MHP-TA Series) Resettable overtemperature protection for Lithium Polymer (LiP) and prismatic cells used in various portable electronic applications.TE Connectivity Metal Hybrid PPTC (MHP-TA) Devices The rapidly expanding market for ultra-thin portable electronic devices such as media tablets and ultra-thin PCs has created demand for very thin, low-profile, light-weight and high-capacity Lithium Polymer (LiP) and prismatic cells. A new MHP (Metal Hybrid PPTC) device, the MHP-TA, offers a 9V rating and a higher DC current rating than typical battery strap devices to meet the battery safety requirements of higher-capacity LiP and prismatic batteries found in the latest tablet and ultra-thin computing products. Hybrid MHP technology connects a bimetal protector in parallel with a PPTC (polymeric positive temperature coefficient) device. The resulting MHP-TA device helps provide resettable overtemperature protection, while utilizing the PPTC device to act as a heater and to help keep the bimetal latched until the fault is removed. APPLICATIONS Battery cell protection for high-capacity Lithium Polymer and prismatic cells used in: - Media tablets KEY FEATURES - Ultra-thin notebook PCs - E-readers 9V rating DC BENEFITS Two levels of current carrying capacity: low current (approximately 6A Capable of handling the higher voltages and battery discharge rates found in high- hold current 25C) capacity LiP and prismatic cell applications. high current (approximately 15A Provides resettable overtemperature protection in high-capacity LiP and prismatic cell applications. hold current 25C) Multiple activation temperature ratings DESIGN CONCEPT (72C, 77C, 82C, 85C, 90C) In normal operation, current passes through the bimetal contact due to its low contact Miniature size allows for compact resistance. During an abnormal event, the device reacts to the rise in cell temperature battery pack designs causing the bimetal contact to open at the specified temperature and its contact resistance to increase. At this point, the current shunts to the lower resistance PPTC which acts as a heater and helps keep the bimetal protector open and in a latched position until the fault is removed. te.com/MHP-Launch/