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Manufacturer Part #


MIC5239 Series 3.3 V Fixed Output 500 mA SMT LDO Regulator - SOT-223 T/R

Mfr. Name: Microchip
Standard Pkg:
Product Variant Information section
Date Code: 1924
Product Specification Section
Technical Attributes
Attributes Table
Input Voltage-Min: 2.3V
Input Voltage-Max: 30V
Output Voltage Fixed: 3.3V
Dropout Voltage-Max: 400mV
Output Current-Max: 500mA
Rated Power: 2W
Tolerance (%): ±1%
Operating Temp Range: -40°C to +125°C
Regulator Topology: Fixed
Quiescent Current: 23µA
No. of Outputs: Single
Output Noise: 160µV
Load Regulation: 30mV
Line Regulation (%): 0.5%
Package Style:  SOT-223 (TO-261-4, SC-73)
Mounting Method: Surface Mount
Features & Applications

The MIC5239-3.3YS TR is a low quiescent current, µCap low-dropout regulator. With a maximum operating input voltage of 30 V and a quiescent current of 23 µA, it is ideal for supplying keep-alive power in systems with high voltage batteries. Capable of 500 mA output, the MIC5239 has a dropout voltage of only 350 mV. It can provide high output current for applications such as USB.

As a µCap LDO, the MIC5239 is stable with either a ceramic or a tantalum output capacitor. It only requires a 3.3 µF output capacitor for stability. The MIC5239 includes a logic compatible enable input and an under voltage error flag indicator. Other features of the MIC5239 include thermal shutdown, current limit, over voltage shutdown, reverse-leakage protection, and reverse-battery protection. Available in the thermally enhanced SOIC-8, MSOP-8 and SOT-223, the MIC5239 comes in fixed 3.0 V and adjustable voltages.


  • Ultra-low quiescent current (IQ = 23 µA @IO = 100 µA)
  • Continuious 500 mA output current
  • Wide input range: 2.3 V to 30 V
  • Low dropout voltage:
  • 350 mV @500 mA;
  • ±1.0% initial output accuracy
  • Stable with ceramic or tantalum output capacitor
  • Logic compatible enable input
  • Low output voltage error flag indicator
  • Over current protection
  • Thermal shutdown
  • Reverse-leakage protection
  • Reverse-battery protection
  • High power SOIC-8, MSOP-8 and SOT-223 packages


  • USB power supply
  • Keep-alive supply in notebook and portable personal computers
  • Logic supply from high voltage batteries
  • Automotive electronics
  • Battery-powered systems
Pricing Section
Minimum Order:
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Factory Lead Time:
12 Weeks
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Product Variant Information section