1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. MAX1821


Features and Benefits

  • Dynamically Adjustable Output from 0.4V to 3.4V (MAX1820)
  • Programmable Output from 1.25V to 5.5V (MAX1821)
  • SYNC to 13MHz External Clock (MAX1820X)
  • SYNC to 19.8MHz External Clock (MAX1820Y)
  • NO SYNC, Internal 1MHz Oscillator (MAX1820Z)
  • Low Quiescent Current
    • 180µA (typ) in Skip Mode
    • 0.1µA (typ) in Shutdown Mode
  • No External Schottky Diode Required
  • 600mA Guaranteed Output Current
  • 0% to 100% Duty-Cycle Operation
  • 150mV Dropout at 600mA Load (Including RDC of External Inductor)
  • µMAX or UCSP Packaging

Product Details

The MAX1820/MAX1821 low-dropout, pulse-width-modulated (PWM) DC-DC buck regulators are optimized to provide power to the power amplifier (PA) in WCDMA cell phones; however, they may be applied in many other applications where high efficiency is a priority. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600mA; 1MHz PWM switching allows for small external components, while skip mode reduces quiescent current to 180µA with light loads.

The MAX1820 is dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The circuit is designed such that the output voltage settles in <30µs for a full-scale change in voltage and current. The MAX1821 is set with external resistors to provide any fixed output voltage in the 1.25V to 5.5V range.

The MAX1820/MAX1821 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count; 100% duty-cycle operation allows for low dropout of only 150mV at 600mA load, including the external inductor resistance. The devices are offered in 10-pin µMAX® and tiny 3 x 4 chip-scale (UCSP™) packages.


  • Digital Still Cameras
  • Handheld Instruments (PDAs, Palmtops)
  • Microprocessor Core Supplies
  • PCMCIA and Network Cards
  • PDA, Palmtop, and Notebook Computers
  • WCDMA Cell Phone Power Amplifiers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX1821EUB+ Material Declaration Reliability Data 10-MINI_SO-N/A
MAX1821EUB+T Material Declaration Reliability Data 10-MINI_SO-N/A
Wafer Fabrication Data

Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



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