General Description
The MIC3490 is a 100 mA, highly accurate,
low-dropout regulator with high input voltage and
ultra-low ground current. This combination of high
voltage and low ground current makes the MIC3490
ideal for multi-cell Li-Ion battery systems.
As a μCap LDO design, the MIC3490 is stable with
either ceramic or tantalum output capacitors. It only
requires a 2.2 μF output capacitor for stability.
Features of the MIC3490 include enable input, thermal
shutdown, current limit, reverse battery protection and
reverse leakage protection.
Available in five output voltage options (1.8V, 2.5V,
3.0V, 3.3V and 5.0V), the MIC3490 is offered in a 5-pin
SOT23 package with a junction temperature range of
-40°C to + 125°C.

Features
• Wide Input Voltage Range: 2.3V to 36V
• Ultra-Low Ground Current: 18 μA
• Low Dropout Voltage of 270 mV at 100 mA
• High Output Accuracy of ±2.0% Overtemperature
• μCap: Stable with Ceramic or Tantalum
Capacitors
• Excellent Line and Load Regulation Specifications
• Near Zero Shutdown Current: Typical 0.1 μA
• Reverse Battery Protection
• Reverse Leakage Protection
• Thermal Shutdown and Current-Limit Protection
• SOT23-5 Package
• The MIC3490 is Pin-to-Pin Compatible with
LM3940

Applications
• Keep-Alive Supply in Notebook and Portable
Computers
• USB Power Supply
• Logic Supply for High-Voltage Batteries
• Automotive Electronics
• Battery-Powered Systems
• 3 to 4-Cell Li-Ion Battery Input Range