65V, Low-Quiescent-Current, High-Voltage Linear Regulators with µP Reset and Watchdog Timer

High-Voltage, Low-Quiescent-Current Linear Regulators Ideal for Automotive and Industrial Applications

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The MAX5023/MAX5024 high-voltage linear regulators operate from a +6.5V to +65V input voltage and deliver up to 150mA of output current. These devices consume only 60µA of quiescent current with no load and withstand a -60V reverse-battery voltage at the input. The MAX5023/MAX5024 include an active-low internal microprocessor (µP) reset circuit that asserts when the regulator output drops below the preset output voltage threshold by 7.5% or 12.5%, depending on the device selected. Both devices are available with a fixed +3.3V or +5V output. These devices are short-circuit protected and include thermal shutdown.

In addition to an enable input to turn on or off the regulator, the MAX5023/MAX5024 include an active-low HOLD input that allows for the implementation of a self-holding circuit without requiring external components. Setting active-low HOLD low after enabling the regulator, forces the regulator to remain on even if EN is subsequently set low. Releasing active-low HOLD shuts down the regulator.

The MAX5023 includes a watchdog input that monitors a pulse train from the µP and generates reset pulses if the watchdog input remains high or low for a duration longer than the 1.6s watchdog timeout period. The MAX5024 includes a SET input which, when connected to ground, selects a preset output voltage of +3.3V (MAX5024S/MAX5024T) or +5V (MAX5024L/MAX5024M). Set the adjustable output voltage by connecting SET to the regulator's output through a resistive-divider network.

The MAX5023/MAX5024 operate over the automotive temperature range (-40°C to +125°C) and are available in a thermally enhanced, surface-mount 8-pin SO-EP package.
MAX5023, MAX5024: Typical Operating Circuit MAX5023, MAX5024: Typical Operating Circuit Enlarge+

Key Features

  • Wide Operating Input Voltage Range +6.5V to +65V
  • Thermally Enhanced 8-Pin SO Package with Exposed Pad Dissipates 1.5W
  • Guaranteed 150mA Output Current
  • 60µA No-Load Supply Current
  • -60V Reverse-Battery Protection
  • Preset +3.3V or +5.0V Output Voltage
  • Thermal and Short-Circuit Protection
  • Operate Over -40°C to +125°C Temperature Range
  • Integrated µP Reset Circuit
  • Watchdog Timer with 1.6s Timeout Period (MAX5023)
  • Regulator Enable and Hold Inputs Implement Self-Holding Circuit
  • SET Input for Adjustable Output Voltage (MAX5024)


  • Automotive
  • Fire/Smoke Alarms
  • Home Security
  • Industrial
  • Telecom/Networking

See parametric specs for Linear Regulators (134)

Part NumberVIN
MAX5023 6.565-150
MAX5024 2.5

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.

Technical Documents

App Note 3333 Pass Transistor Enhances Regulator's Output Current
Product Reliability Reports: MAX5024.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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Related Resources

Automotive Ultra Low Quiescent Current Linear Regulator Family

  • Enables System Designers to Meet Stringent Module Requirements for 100μA Quiescent Current
  • Tiny Output Capacitors Reduce Board Space and BOM Cost
  • Accurate Active-Low RESET Output with Adjustable Delay Eliminates Need for Separate Reset IC