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

Product Details


The ADP121 is a quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 150 mA of output current. The low 135 mV dropout voltage at 150 mA load improves efficiency and allows operation over a wide input voltage range. The low 30 μA of quiescent current at full load makes the ADP121 ideal for battery-operated portable equipment.

The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area.

Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in a tiny 5-lead TSOT and 4-ball 0.4 mm pitch WLCSP pack-ages and utilizes the smallest footprint solution to meet a variety of portable applications.

FEATURES and BENEFITS

  • Input voltage range: 2.3 V to 5.5 V
  • Output voltage range: 1.2 V to 3.3 V
  • Output current: 150 mA
  • Low quiescent current
    IGND = 11 μA with 0 μA load
    IGND = 30 μA with 150 mA load
  • Low shutdown current: <1 μA
  • Low dropout voltage
    90 mV @ 150 mA load
  • High PSRR
    70 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
  • See data sheet for additional features

Typical Application Circuit Diagram for ADP121

Documentation

Title Content Type File Type
ADP121: 150 mA, Low Quiescent Current, CMOS Linear Regulator Data Sheet (Rev G, 08/2012) (pdf, 979 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
CN0280: Robust Completely Isolated Current Sense Circuit with Isolated Power Supply for Solar Photovoltaic Converters  (pdf, 468 kB) Circuit Note PDF
CN-0185: A Novel Analog-to-Analog Isolator Using an Isolated Sigma-Delta Modulator, Isolated DC-to-DC Converter, and Active Filter  (pdf, 119 kB) Circuit Note PDF
CN-0190: Robust, Multivoltage, High Efficiency, 25 W Universal Power Supply Module with 6 V to 14 V Input  (pdf, 357 kB) Circuit Note PDF
CN-0187: Crest Factor, Peak, and RMS RF Power Measurement Circuit Optimized for High Speed, Low Power, and Single 3.3 V Supply  (pdf, 163 kB) Circuit Note PDF
CN-0164: Low Power, Long Range, ISM Wireless Measuring Node  (pdf, 172 kB) Circuit Note PDF
Introduction to ADIsimPower
ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
Videos HTML
Isolating Power in Communication Bus and Gate Drive Applications
Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.
Webcasts WEBCAST
UG-052: RedyKit for the ADP121 LDO  (pdf, 118 kB)
Order the RedyKit for easy product evaluation and prototyping. The RedyKit ships with 2 preset evaluation boards plus 3 each of the standard fixed output voltage options in the product family. This allows evaluation of any voltage option with one kit.
User Guides PDF
The Fundamentals of LDO Design and Applications Technical Articles HTML
What are LDOs and how are they used? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
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.
ADIsim Design/Simulation Tools ZIP
Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
ADIsim Design/Simulation Tools HTML
ADIsimPower™ Voltage Regulator Design Tool
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.
ADIsim Design/Simulation Tools HTML
Launch of ADIsimPower Voltage Regulator Selection Vin (min) V Vout V   Find Solutions
Vin (max) V Iout A

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

ADP121 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP121-ACBZ12R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase
ADP121-ACBZ15R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase
ADP121-ACBZ165R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info Notify Me Purchase Sample
ADP121-ACBZ188R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-ACBZ18R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-ACBZ20R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-ACBZ25R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase
ADP121-ACBZ28R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-ACBZ30R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-ACBZ33R7 Status: Production 4 Ball WLCSP 4 Ind Reel, 3000 - $0.31 Y  Material Info PCN Purchase Sample
ADP121-AUJZ12R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ15R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ18R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ20R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ25R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ28R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ30R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
ADP121-AUJZ33R7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.27 Y  Material Info Notify Me Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADP121 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP121CB-1.2-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-1.5-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-1.8-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-2.0-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-2.5-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-2.8-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-3.0-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121CB-3.3-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP121UJZ-REDYKIT Status: Production Evaluation Board $45.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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