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MIC5205: 150 mA Low-Noise LDO Regulator

The MIC5205 is a low current, very low dropout voltage regulator with a maximum current of 150mA and a voltage drop of 165mV at full load. MIC5205 has an Enable pin to provide Zero-current shutdown mode. The regulator comes in fixed and adjustable output voltage versions in a small SOT-23-5 package.


Pin Configuration

Pin No.

Pin Name

(Fixed Ver.)

Pin Name

(Adj. Ver.)





Supply Input








Enable/Shutdown (Input): CMOS compatible input. Logic-high = enable, logic-low or open = shutdown




Reference Bypass: Connect external 470 pF capacitor to GND to reduce output noise. May be left open.

Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage divider




Regulator Output



  • Input Supply Voltage: 2.5V to 16V
  • Output Voltage: 2.5V to 5V Fixed/Adjustable
  • Continuous Output Current: 150mA
  • Drop-out Voltage: 165mV at 150mA
  • Enable Logic HIGH: 2 V
  • Enable Logic LOW: 0.4 V
  • Available in SOT-23-5 Package


Note: The Complete Technical Details can be found at the MIC5205 datasheet given at the end of this page.


Equivalent for MIC5205: LD2985, TPS73633, TLV713


Alternative LDO Regulators: LP2985, AMS1117, MIC5225


MIC5205 LDO Regulator Overview

The MIC5205 is an efficient linear voltage regulator with ultra-low noise output, very low dropout voltage (165 mV at 150 mA), and very low ground current (600 µA at 100 mA output). The input voltage of the Regulator can be between 2.5V to 16V. MIC5205 is especially designed for hand-held, battery-powered devices, and includes a CMOS or TTL compatible enable/shutdown control input. When shut down, power consumption drops near to zero. The output voltage of the MIC5205 can be from 2.5V to 5V, you can use the below table to select the right part number

MIC5205 Part Number


MIC5205 is generally used in Laptop, Notebook, and Palmtop Computers and other battery-Powered Equipment’s.


How to use the MIC5205

MIC5205 low dropout regulator comes in 5-pin package in which the enable pin can be used turn on or off the regulator, this helps the designers to turn off the regulator and prevent battery usage when not in use. A capacitor from ADJ to ground is used for improved noise performance. The Adjust pin is used to set the output voltage of the regulator to the required value using the below circuit.

How to use the MIC5205


The MIC5205 can be adjusted to a specific output voltage by using two external resistors of desired values. As you can see the resistors values R1 and R2 decides the output voltage Vout of our regulator. The resistors set the output voltage based on the following equation:

V = 1.242V × (R2\R1 + 1)


The dropout voltage of the regulator can vary between 17mV to a maximum of 150mV based on the current drawn from the regulator.



  • Cellular Telephones
  • Laptop, Notebook, and Palmtop Computers
  • Battery-Powered Equipment
  • PCMCIA VCC and VPP Regulation/Switching
  • Consumer/Personal Electronics
  • SMPS Post-Regulator and DC/DC Modules
  • High-Efficiency Linear Power Supplies



2D Model of MIC5205

Component Datasheet

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