28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output

100mA, 45µA IQ, LDO Regulator in High-Power Thermally Enhanced 8-Pin SO or TDFN Package

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The MAX5091 high-voltage linear regulator is designed to operate from a +5V to +28V input voltage, and withstands up to 40V transients. The device consumes only 45µA of quiescent current at 100µA output current. The MAX5091 delivers up to 100mA of output current with low 50mV maximum dropout voltage. The MAX5091 provides an active-low open-drain microprocessor RESET output. The reset timeout period is programmable and can be set with an external capacitor. The MAX5091 includes an uncommitted comparator for input voltage monitoring/power-fail indication. The device is available with a fixed +5V (MAX5091A) or +3.3V (MAX5091B) output. The MAX5091 is short-circuit protected and includes thermal shutdown.

The MAX5091 operates over the -40°C to +125°C automotive temperature range and is available in 8-pin, thermally enhanced TDFN and SO-EP packages.

MAX5091: Typical Application Circuit MAX5091: Typical Application Circuit Enlarge+

Key Features

  • +5V to +28V Wide Operating Input Voltage Range
  • Withstands 40V Input Voltage Transients
  • Guaranteed 100mA Output Current
  • 45µA Typical Quiescent Current at 100µA Output Current
  • Preset +5V (MAX5091A) or +3.3V (MAX5091B) Output Voltage
  • Stable with Only 10µF Output Capacitance
  • RESET Output with Adjustable Timeout Period
  • Uncommitted Comparator for Voltage Monitoring/Power-Fail Indication
  • Output Overload and Short-Circuit Protection
  • Thermal Shutdown
  • Available in 8-Pin TDFN (1.95W at TA = +70°C) and 8-Pin SO (1.5W at TA = +70°C)
  • Operates Over -40°C to +125°C Automotive Temperature Range


  • Home Security/Safety
  • Industrial
  • Telecom/Networking

See parametric specs for Linear Regulators (134)

Part NumberVIN
MAX5091 528100

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.
Request Reliability Report for: MAX5091 
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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