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

MIC3490属于集成电路（IC） > 线性 + 开关稳压器。微芯科技股份有限公司制造生产的MIC3490稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。