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.
|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|
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.
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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.
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.
|The Fundamentals of LDO Design and Applications||Technical Articles||HTML|
|RAQs index||Rarely Asked Questions||HTML|
|What are LDOs and how are they used?||FAQs/RAQs||HTML|
|Glossary of EE Terms||Glossary||HTML|
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ADI Linear Regulator Design Tool and Parametric Search
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|
Blank/Unpopulated boards need to be ordered through the appropriate download tool from ADIsimPower.
Single voltage or feature evaluation boards and RedyKit.
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.
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.