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AP2112 CMOS LDO Regulator

The AP2112 is CMOS process low dropout linear regulator that delivers a 600mA (min.) continuous load current. The AP2112 comes with an Enable function with a fixed output voltage of 1.2V, 1.8V, 2.5V, 2.6V, or 3.3V. It has an output accuracy of ±1.5% and available in SOT25, SOT89-5, and SO-8 packages.


AP2112 Pinout Configuration

Pin No.

Pin Name




Supply Input






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



Regulator Output



Not Connected



  • Input Supply Voltage: 2.5V to 6V
  • Output Voltage: 3.3 V  
  • Output Current: 600 mA
  • Output Type: Fixed
  • Continuous Output Current: 150mA
  • PSRR / Ripple Rejection - Typ:65 dB
  • Operating Supply Current: 55 uA
  • Dropout Voltage - Max: 400 mV
  • Available in SOT25, SOT89-5, and SO-8 packages


Note: The complete Technical Details can be found in the AP2112 datasheet given at the end of this page.


AP2112 Equivalents

LD2985, TPS73633, TLV713


Alternative LDO Regulators 

LP2985, AMS1117, MIC5225


AP2112 LDO Regulator Introduction

The AP2112 is an efficient linear voltage regulator with ultra-low noise output, very low dropout voltage (400 mV), and very low ground current. The input voltage of the Regulator can be between 2.5V to 6V. AP2112 is especially designed for hand-held, battery-powered devices, the AP2112 includes a CMOS compatible enable/shutdown control input. When shutting down, power consumption drops nearly to zero.


AP3112 is generally used in Laptop, Notebook, Portable DVD, LCD Monitor and Palmtop Computers, and other battery-Powered Equipment’s.


How to use the AP2112 Regulator

AP2112 low dropout regulator comes in 5 and 8-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. Supply the input voltage to the V-in pin and we get the regulated 3.3V at the output pin. The input and output capacitors are used for ripple filtering. A sample application circuit from the AP2112 datasheet is shown below.

AP2112 Application Circuit


Applications of AP2112

  • 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 AP2112

AP2112 Regulator Dimensions

Component Datasheet

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