MHP-TAM Over-Temperature Protection Devices

By Littelfuse Inc 61

MHP-TAM Over-Temperature Protection 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, lightweight, and high-capacity lithium polymer (LiP) and prismatic cells. Littelfuse metal hybrid PPTC (MHP) device, the MHP-TAM, offers a 9 VDC rating and a higher current rating than typical battery strap devices. This meets 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 polymeric positive temperature coefficient (PPTC) device. The resulting MHP-TAM device helps provide resettable over-temperature protection while utilizing the PPTC device to act as a heater and to help keep the bimetal latched until the fault is removed.

Features and Benefits
  • Capable of handling voltages and battery charge rates found in high-capacity LiP and prismatic cells used in cutting-edge applications
  • Helps provide resettable and accurate over-temperature protection
  • Compact size and thin form factor facilitates circuit protection in ultra-thin battery pack designs
  • Two levels of hold current:
    • Low current (nominal 6 A hold current at 25°C)
    • High current (nominal 15 A hold current at 25°C)
  • Multiple temperature ratings
    • 72°C, 77°C, 82°C, 85°C, and 90°C
  • Compact size (L: 5.8 mm x W: 3.85 mm x H: 1.15 mm)
Applications    
  • Battery cell protection for high-capacity lithium polymer and prismatic cells used in:
    • Notebook PCs
    • Ultra-books
    • Tablets
    • Smart phones
   

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