Ideal Diode, Reverse-Battery, and Overvoltage Protection Switch/Limiter Controllers with External MOSFETs

Overvoltage Protection Devices are Ideal Diodes with Reverse-Current Protection and Small Forward Drop

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The MAX16914/MAX16915 low-quiescent-current overvoltage and reverse-battery protection controllers are designed for automotive and industrial systems that must tolerate high-voltage transient and fault conditions. These conditions include load dumps, voltage dips, and reversed input voltages. The controllers monitor the input voltage on the supply line and control two external pFETs to isolate the load from the fault condition. The external pFETs are turned on when the input supply exceeds 4.5V and stay on up to the programmed overvoltage threshold. During high-voltage fault conditions, the controllers regulate the output voltage to the set upper threshold voltage (MAX16915), or switch to high resistance (MAX16914) for the duration of the overvoltage transient to prevent damage to the downstream circuitry. The overvoltage event is indicated through an active-low, open-drain output, active-low OV.

The reverse-battery pFET behaves as an ideal diode, minimizing the voltage drop when forward biased. Under reverse bias conditions, the pFET is turned off, preventing a downstream tank capacitor from being discharged into the source.

Shutdown control turns off the IC completely, disconnecting the input from the output and disconnecting TERM from its external resistor-divider to reduce the quiescent current to a minimum.

Both devices are available in a 10-pin µMAX® package, and operate over the automotive -40°C to +125°C temperature range.

MAX16914, MAX16915: Typical Operating Circuit MAX16914, MAX16915: Typical Operating Circuit Enlarge+

Key Features

  • Architecture Replaces Protection Diodes Reducing the Forward Voltage, Allowing Operation During Cold-Crank Conditions
    • Transient Voltage Protection Up to +44V and -75V
    • Low-Voltage Drop when Used with Properly Sized External pFETs
    • 4.5V to 19V Input-Voltage Operation
  • Ideal Diode Reverse-Battery Protection Supports Down to -75V to Protect System During Negative-Voltage Transients
    • Back-Charge Prevention Avoids Discharging Downstream Tank Capacitance
  • Overvoltage Protection Enables System to Survive Up to a +44V Load Dump
    • Overvoltage Indicator
    • Thermal-Overload Protection
  • Low Operating Current Meets Stringent Module Specifications While Maintaining System Protection
    • 29µA Low Operating Current
    • 6µA Low Shutdown Current


  • Industrial

See parametric specs for Overvoltage Protection Controllers (74)

Part NumberChannelsVIN
Over Voltage Trip Level
Under Voltage Lockout
Over Volt. FlagtGATE (On)
tGATE (Off)
minmaxSee Notes
MAX16914 14.519Adjustable (1.2V)4.357.5Open-Drain0.023
$0.83 @1

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX16914.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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