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ADP2138:  Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter

Product Details

Product Status:Recommended for New Designs

The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.

The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.

The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rect-ifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 μA (typical) from the input source.

Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current over-shoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).

APPLICATIONS
  • PDAs and palmtop computers
  • Wireless handsets
  • Digital audio, portable media players
  • Digital cameras, GPS navigation units

FEATURES and BENEFITS

  • Input voltage: 2.3 V to 5.5 V
  • Peak efficiency: 95%
  • 3 MHz fixed frequency operation
  • Typical quiescent current: 24 μA
  • Very small solution size
    6-lead, 1 mm × 1.5 mm WLCSP package
  • Fast load and line transient response
  • 100% duty cycle low dropout mode
  • Internal synchronous rectifier, compensation, and soft start
  • Current overload and thermal shutdown protections
  • Ultralow shutdown current: 0.2 μA (typical)
  • Forced PWM and automatic PWM/PSM modes
  • Supported by ADIsimPower Design Tool

Typical Applications Circuit for ADP2138

Documentation

Title Content Type File Type
ADP2138/ADP2139: Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter Datasheet (Rev C, 01/2013) (pdf, 514 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-249: Evaluation Board for the 800 mA, 3 MHz Buck Regulator  (pdf, 232 kB) User Guides PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP21xx Buck Regulator Design Tool  (zip, 0)
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.

SampleSample & Buy

Price, packaging, availability

ADP2138 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2138ACBZ-0.8-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-1.0-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-1.2-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-1.5-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-1.8-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-2.5-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-2.8-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-3.0-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 Y  Material Info PCN Purchase Sample
ADP2138ACBZ-3.3-R7 Status: Production 6 Ball WLCSP (1.51x1.3mm) 6 Ind Reel, 3000 - $0.90 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.

ADP2138 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2138CB-1.8EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP2138CB-2.8EVALZ Status: Production Evaluation Board $60.00 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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