45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay

400mA, 45V Input, Low-Quiescent-Current Linear Regulators in High-Power TQFN Packages

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The MAX5087 high-voltage linear regulator operates from an input voltage of 6.5V to 45V and delivers up to 400mA of output current. The device consumes only 70µA of quiescent current with no load and 11µA in shutdown. The device includes a SET input, that when connected to ground, selects a preset output voltage of 3.3V (MAX5087A) or 5.0V (MAX5087B). Alternatively, the output voltage can be adjusted from 2.5V to 11V by simply connecting SET to the regulator's output through a resistive divider network. The MAX5087 also provides an open-drain, active-low microprocessor (µP) reset output that asserts when the regulator output drops below the preset output voltage threshold. An external capacitor programs the reset timeout period. Other features include an enable input, thermal shutdown, and short-circuit protection.

The MAX5087 operates over the automotive temperature range of -40°C to +125°C and is available in a 16-pin TQFN thermally enhanced package.
MAX5087: Functional Diagram MAX5087: Functional Diagram Enlarge+

Key Features

  • Wide Operating Input Voltage Range (6.5V to 45V)
  • Thermally Enhanced Package Dissipates
    • 2.6W at TA = +70°C (16-Pin TQFN)
  • Guaranteed 400mA Output Current
  • 70µA Quiescent Supply Current
  • Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output Voltage
  • Remote Load Sense Capability
  • Enable Input
  • Integrated µP Reset Circuit with Programmable Timeout Period
  • Thermal and Short-Circuit Protection
  • -40°C to +125°C Operating Temperature Range


  • Home Security/Safety
  • Industrial
  • Networking

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: MAX5087B.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