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
Part NumberRegulatorsVIN
Preset VOUT
Low Batt./ Pwr. Fail OutPOK/Reset Thresh.
WatchdogReverse Batt. Protect.Oper. Temp.
minmaxtypmaxnomSee Notes
MAX5091 1528
0.3100100100YesVout-10%NoNo-40 to +125
SOIC (N)/8
$0.97 @1k
See All Linear Regulators (144)
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.

Quality and Environmental Data

Request Reliability Report for: MAX5091 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX5091AASA+
  • MAX5091AASA+T
  • MAX5091AATA+
  • MAX5091AATA+T
  • MAX5091BASA+
  • MAX5091BASA+T
  • MAX5091BATA+
  • MAX5091BATA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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