1. Products
  2. Power Monitor, Control, and Protection
  3. Surge Stopper, Overvoltage, and Overcurrent Protection
  4. MAX4845


Features and Benefits

  • Overvoltage Protection Up to 28V
  • Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip Level
  • Low (10µA) Undervoltage Lockout Standby Current
  • Drives Low-Cost nMOSFET
  • Internal 50ms Startup Delay
  • Internal Charge Pump
  • Overvoltage Fault FLAG Indicator
  • 6-Pin (1.5mm x 1.0mm) µDFN Package

Product Details

The MAX4843–MAX4846 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to 28V. When the input voltage exceeds the overvoltage threshold, these devices turn off a low-cost, external n-channel FET(s) to prevent damage to the protected components. An internal charge pump eliminates the need for external capacitors and drives the FET gate for a simple, robust solution.

The overvoltage trip level is set to 7.4V (MAX4843), 6.35V (MAX4844), 5.8V (MAX4845), or 4.65V (MAX4846). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices enter a low standby current mode (10µA). The MAX4843/MAX4844/MAX4845 have a UVLO threshold of 4.15V, the MAX4845C/MAX4845D have a UVLO threshold of 2.2V, and the MAX4846 has a UVLO threshold of 2.5V. In addition to the single FET configuration, the devices can be configured with back-to-back external FETs to prevent currents from being back-driven into the adapter.

An additional feature includes a ±15kV ESD-protected input when bypassed with a 1µF capacitor to ground. All devices are offered in small 6-pin µDFN (1.5mm x 1.0mm) and 6-pin ultra-thin LGA (MAX4845EYT+T only) (1.5mm x 1.0mm) packages and are specified for operation over the -40°C to +85°C temperature range.


  • Cell Phones
  • Digital Still Cameras
  • MP3 Players
  • PDAs and Palmtop Devices
Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). To request an NDA, click here.

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX4845DEYT+T Material Declaration Reliability Data 6-LGA-1.5X1X0.5
Wafer Fabrication Data

Sample & Buy

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