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ADP2105:  1 Amp Synchronous, Step-Down DC-to-DC Converter

Product Details


Newer Alternatives: NEW DESIGNS:
ADP2120 1.25A, 1.2MHz Synchronous Step-Down DC-to-DC Regulator

The ADP2105/ADP2106/ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP_VQ package. At medium to high load currents, these devices use a current-mode, constant-frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2105/ADP2106/ADP2107 use a pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency to save power.

The ADP2105/ADP2106/ADP2107 run from input voltages of 2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cells, PCMCIA, and other standard power sources. The output voltage of ADP2105/ADP2106/ADP2107-ADJ is adjustable from 0.8 V to the input voltage, whereas the ADP2105/ADP2106/ADP2107-xx are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V. Each of these variations is available in three maximum current levels, 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. During logic-controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 μA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and programmable soft start to limit inrush current at startup.

Applications

  • Mobile handsets
  • Portable media players
  • PDAs and palmtop computers
  • Digital Cameras
  • Smart Phones
  • GPS

FEATURES and BENEFITS

  • Extremely high 97% peak efficiency
  • Internal primary and synchronous switches
  • Fixed Frequency, Peak Current-Mode PWM at medium and high loads
  • PSM operation at light loads for high efficiency
  • Ultralow quiescent current: 30μA (max)
  • Internally Set Current Limit
  • Internal Thermal Protection
  • 0.1 μA shutdown supply current (typ)
  • Maximum duty cycle 100%
  • Smoothly transitions into low dropout
    (LDO) mode
  • Small 16-lead 4 mm × 4 mm
    LFCSP_VD package
  • Optimized for small ceramic output capacitors

Typical Application Circuit Diagram for ADP2105

Documentation

Title Content Type File Type
ADP2105/ADP2106/ADP2107: 1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters Data Sheet (Rev D, 08/2012) (pdf, 1162 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
Understanding How Voltage Regulators Work Technical Articles HTML
ADP1829, ADP210x, ADP171x Reference Design  (pdf, 447 kB)
Seven Output Voltages: 5.0 V, 3.6 V, 3.3 V, 2.5 V, 1.8 V, 1.2 V, 0.9 V; Output Current: 0.002 A to 3.0 A; Input voltage: 10.8-13.2 V; Ripple 2% ppk of Output Voltage; Transient step ±5%, 50% max load
Power Reference Designs PDF
ADP1829, ADP210x and ADP171x Reference Design  (pdf, 687 kB)
Seven Output Voltages: 3.6 V, 3.3 V,3.3l V 2.5 V, 1.8 V, 1.25 V, 0.9 V; Output Current: 0.002 A to 3.0 A; Input voltage: 10.8-13.2 V; Ripple 2% ppk of Output Voltage; Transient step ±5%, 50% max load
Power Reference Designs PDF
DC-to-DC Switching Regulator IC Solutions (10/06)  (pdf, 3205 kB) Overview 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

ADP2105 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2105ACPZ-1.2-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.13 Y  Material Info PCN Purchase Sample
ADP2105ACPZ-1.5-R7 Status: Last Time Buy 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - - Y  Material Info PCN/PDN Purchase
ADP2105ACPZ-1.8-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.13 Y  Material Info PCN Purchase Sample
ADP2105ACPZ-3.3-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.13 Y  Material Info PCN Purchase Sample
ADP2105ACPZ-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.13 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.

ADP2105 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2105-1.8-EVALZ Status: Production Evaluation Board $60.72 Yes -
ADP2105-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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