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ADP120:  100 mA, Low Quiescent Current, CMOS Linear Regulator

Product Details

Newer Alternatives:
  • ADP121 150 mA, Low Quiescent Current, CMOS Linear Regulator in 5-Lead TSOT or 4-Ball WLCSP

The ADP120 is a low quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 100 mA of output current. The low 60 mV dropout voltage at 100 mA load improves efficiency and allows operation over a wide input voltage range. The low 22 μA of quiescent current at full load makes the ADP120 ideal for battery-operated portable equipment.

The ADP120 is available in output voltages ranging from 1.2 V to 3.3 V. The part is optimized for stable operation with small 1 μF ceramic output capacitors. The ADP120 delivers good transient performance with minimal board area. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP120 is available in a tiny 5-lead TSOT and a 4-ball 0.4 mm pitch WLCSP and utilizes the smallest footprint solution for use in a variety of portable applications.


  • Input voltage range: 2.3 V to 5.5 V
  • Output voltage range: 1.2 V to 3.3 V
  • Output current: 100 mA
  • Low quiescent current
    IGND = 11 μA with zero load
    IGND = 22 μA with 100 mA load
  • Low shutdown current: <1 μA
  • Low dropout voltage
    60 mV @ 100 mA load
  • High PSRR
    73 dB @ 1 kHz at VOUT = 1.2 V
    70 dB @ 10 kHz at VOUT = 1.2 V
  • Low noise: 40 μV rms at VOUT = 1.2 V
  • No noise bypass capacitor required
  • Initial accuracy: ±1%
  • Stable with small 1 μF ceramic output capacitor

Typical Application Circuit for ADP120


Title Content Type File Type
ADP120: 100mA, Low Quiescent Current, CMOS Linear Regulator Data Sheet (Rev B, 03/2009) (pdf, 529 kB) Data Sheets PDF
AN-1072: How to Successfully Apply Low Dropout Regulators  (pdf, 105 kB)
This application note reviews the basic LDO topology, explains key specifications, and shows the application of low dropout voltage regulators in systems.
Application Notes PDF
CN-0075: USB Based Temperature Monitor Using the ADuC7061 Precision Analog Microcontroller and an External RTD  (pdf) Circuit Note PDF
CN-0214: USB-Based Thermocouple Temperature Monitor with Cold Junction Compensation Using the ADuC7060/ADuC7061 Precision Analog Microcontroller  (pdf, 363 kB) Circuit Note PDF
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Design Tools,Models,Drivers & Software

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ADI Linear Regulator Design Tool and Parametric Search  (zip)
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
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This expert design tool produces custom DC-DC converter designs in about a minute. The user enters 5 inputs and chooses to optimize for efficiency, PCB space, cost, or part count. Output is a complete schematic, BOM, efficiency plot, and performance summary. A PDF summary and a blank PCB is offered for each design to facilitate fast prototyping to verify the design.
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