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ADP1708:  1 A, Low Dropout, CMOS Linear Regulator

Product Details

The ADP1706/ADP1707/ADP1708 are CMOS, low dropout linear regulators that operate from 2.5 V to 5.5 V and provide up to 1 A of output current. Using an advanced proprietary architecture, they provide high power supply rejection and achieve excellent line and load transient response with a small 4.7 μF ceramic output capacitor.

The ADP1706/ADP1707 are available in 16 fixed output volt-age options. The ADP1708 is available in an adjustable version, which allows output voltages that range from 0.8 V to 5.0 V via an external divider. The ADP1706 allows an external soft start capacitor to be connected to program the start-up time; the ADP1707 and ADP1708 contain internal soft start capacitors that give a typical start-up time of 100 μs. The ADP1707 includes a tracking feature that allows the output to follow an external voltage rail or reference.

The ADP1706/ADP1707/ADP1708 are available in an 8-lead, exposed paddle SOIC package and an 8-lead, 3 mm × 3 mm exposed paddle LFCSP, making them not only very compact solutions but also providing excellent thermal performance for applications requiring up to 1 A of output current in a small, low profile footprint.


  • Notebook computers
  • Memory components
  • Telecommunications equipment
  • Network equipment
  • DSP/FPGA/microprocessor supplies
  • Instrumentation equipment/data acquisition systems


  • Maximum output current: 1 A
  • Input voltage range: 2.5 V to 5.5 V
  • Low shutdown current: <1 μA
  • Low dropout voltage: 345 mV @ 1 A load
  • Initial accuracy: ±1%
  • Accuracy over line, load, and temperature: ±2.5%
  • 16 fixed output voltage options with soft start: 0.75 V to 3.3 V (ADP1706)
  • 16 fixed output voltage options with tracking 0.75 V to 3.3 V (ADP1707)
  • Adjustable output voltage option: 0.8 V to 5.0 V (ADP1708)
  • Stable with small 4.7 μF ceramic output capacitor
  • Excellent load/line transient response
  • Current limit and thermal overload protection

Typical Application Circuit for ADP1708


Title Content Type File Type
ADP1706/ADP1707/ADP1708: 1 A, Low Dropout, CMOS Linear Regulator Data Sheet (Rev 0, 07/2007) (pdf, 555 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
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
The Fundamentals of LDO Design and Applications Technical Articles HTML
Powering High Speed Analog-to-Digital Converters with Switching Power Supplies  (pdf, 2478 kB)
This article demonstrates that analog-to-digital converters can be powered directly from switching power supplies with no loss in performance if careful design practice is followed.
(Power Management DesignLine, May 2009)
Technical Articles PDF
Analog Devices’ 256-Channel, 16-Bit Digital X-Ray Analog Front End Delivers Industry’s Best Combination of Noise, Power and Image Quality (27 Nov 2012) Press Releases 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
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.

SampleSample & Buy

Price, packaging, availability

ADP1708 Model Options
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.

ADP1708 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADP1708-EVALZ Status: Production Evaluation Board $60.72 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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