MAX4921B
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MAX4921B

Battery Power-Up Logic with Overvoltage and Overcurrent Protection

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Provide Overvoltage and Overcurrent Protection in Addition to Battery Power-Up Logic

Part Details
Features
  • Input Overvoltage Protection Up to +28V
  • Preset Overvoltage Protection Trip Level
    6.38V (MAX4919B)
    5.80V (MAX4920B)
    4.65V (MAX4921B)
  • Adapter/Car-Kit Auto-Selector
  • Low-Current Undervoltage Lockout Mode
  • Internal 1.8A (min) Battery Switchover FET
  • Integrated Low-Battery Detect
  • Battery Short-Circuit Protection
  • Low-Cost External nMOS Overvoltage FET
  • 14-Pin TDFN Package (3mm x 3mm)
  • Additional Details
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    The MAX4919B/MAX4920B/MAX4921B overvoltage protection controllers protect low-voltage systems against high-voltage faults up to +28V. An internal 1.8A (min) pFET with low RON (100mΩ) switches a battery to the load and also protects the battery against short-circuit faults. When a short circuit occurs, the current through the internal pFET is limited for a blanking period. If the short condition is present after the blanking period, the switch is latched off and remains off until one of the input signals (IN, HP_PWR, PWR_ON) is cycled. The pFET is turned on by a logic-high voltage at PWR_HOLD, HP_PWR, PWR_ON, or IN.

    The overvoltage thresholds (OVLO) are preset to +6.38V (MAX4919B), +5.80V (MAX4920B), and +4.65V (MAX4921B). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices enter a low-current standby mode. In shutdown mode, the current is reduced to 0.4µA. The MAX4919B/MAX4920B have a +4.27V UVLO threshold, and the MAX4921B has a +2.35V UVLO threshold.

    The MAX4919B/MAX4920B/MAX4921B are offered in a small 14-pin TDFN package (3mm x 3mm) with an exposed paddle and are specified over the extended -40°C to +85°C temperature range.

    Applications

    • Cell Phones
    • Digital Still Cameras
    • MP3 Players
    • PDAs and Palmtop Devices

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