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ADP2121:  600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter

Product Details


The ADP2121 is a high frequency, low quiescent current step-down dc-to-dc converter optimized for portable applications in which board area and battery life are critical constraints. The 6 MHz operating frequency enables the use of tiny ceramic induc-tors and capacitors. Additionally, the synchronous rectification improves efficiency and results in fewer external components.

At high load currents, the device uses a voltage regulating pulse-width modulation (PWM) mode that maintains a constant frequency with excellent stability and transient response. In forced PWM mode, the converter continues operating in PWM for light loads. At light load conditions in auto mode, the ADP2121 can automatically enter a power-saving mode that uses pulse-frequency modulation (PFM) to reduce the effective switching frequency and ensure the longest battery life in portable applications. During logic controlled shutdown (EN ≤ 0.4 V), the input is disconnected from the output and draws less than 0.3 μA current (typical) from the source.

The ADP2121 has an input voltage range of 2.3 V to 5.5 V (2.9 V to 5.5 V for VOUT = 2.3 V), allowing the use of a single Li+/Li− polymer cell, 3-cell alkaline or Ni-MH cell, and other standard power sources. The converter can source up to 600 mA and is internally compensated to minimize external components. Other key features, such as cycle-by-cycle peak current limit, soft start, undervoltage lockout (UVLO), output-to-ground short-circuit protection, and thermal shutdown, protect the internal and external circuit components.

Applications

  • Mobile phones
  • Digital cameras
  • Digital audio
  • Portable equipment

FEATURES and BENEFITS

  • Peak efficiency: 92%
  • Operating frequency: 6 MHz
  • Typical quiescent current in auto mode: 36 μA
  • Fixed output voltage: 1.8 V, 1.82 V, 1.85 V, 1.875 V, 2.3 V
  • Maximum guaranteed load current: 600 mA at VIN = 2.7 V to 5.5 V
  • Input voltage: 2.3 V to 5.5 V
  • Typical shutdown supply current: 0.3 μA
  • Please see data sheet for additional features.

ADP2121 Typical Application Diagram

Documentation

Title Content Type File Type
ADP2121: 600 mA, 6 MHz, Synchronous Step-Down, DC-to-DC Converter Data Sheet (Rev B, 01/2011) (pdf, 985 kB) Data Sheets 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
UG-199: Evaluating the ADP2121 6 MHz, Step-Down Converter  (pdf, 241 kB) User Guides PDF
Understanding How Voltage Regulators Work Technical Articles HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
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.

SampleSample & Buy

Price, packaging, availability

ADP2121 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2121ACBZ-1.8-R7 Status: Production 6 Ball WLCPS (0.9x1.3mm) 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN Purchase Sample
ADP2121ACBZ-1.82R7 Status: Production 6 Ball WLCPS (0.9x1.3mm) 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN Purchase Sample
ADP2121ACBZ-1.85R7 Status: Production 6 Ball WLCPS (0.9x1.3mm) 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN Purchase Sample
ADP2121ACBZ-1875R7 Status: Production 6 Ball WLCPS (0.9x1.3mm) 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN Purchase Sample
ADP2121ACBZ-2.3-R7 Status: Production 6 Ball WLCPS (0.9x1.3mm) 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN 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.

ADP2121 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2121-1.82-EVALZ Status: Production Evaluation Board for 1.8V $60.00 Yes -
ADP2121-1.85-EVALZ Status: Production Evaluation Board for 1.85V $60.00 Yes -
ADP2121-1.875EVALZ Status: Production Evaluation Board for 1.875V $60.00 Yes -
ADP2121-1.8-EVALZ Status: Production Evaluation Board for 1.8V $60.00 Yes -
ADP2121-2.3-EVALZ Status: Production Evaluation Board for 2.3V $60.00 Yes -

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