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

Product Status:Production
Data
Sheet
ADP2105 Data Sheet Rev D, 08/2012 (pdf 1162kB)

Product Details

Product Status:Production
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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

    • Data Sheet, Rev. A, 3/07

    myAnalogmyAnalog
    Product Updates: Notify Me

    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

    ADP2105 Diagram
    Typical Applications and Other Diagrams

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    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
    CN-0141: Powering the AD9788 800 MSPS TxDAC Digital-to-Analog Converter Using the ADP2105 Synchronous Step-Down DC-to-DC Regulator for Increased Efficiency  (pdf, 128 kB) Circuit Note PDF
    Understanding How Voltage Regulators Work Technical Articles HTML
    Power Distribution for High Performance Medical Imaging Systems 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
    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
    Enter values and click on ADIsimPower to find power management solutions. Launch of ADIsimPower Voltage Regulator Design Tool
    Available System Voltage Operating Voltage Rail Load Current
    Vin (min) V Vin (max) V Vout 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.

    Product Recommendations & Reference Designs

    Engineered. Tested. Ready to Integrate.
    Learn More
    Updated 01/2010
    Circuit Note PDF

    CN0141:Powering the AD9788 800 MSPS TxDAC Digital-to-Analog Converter Using the ADP2105 Synchronous Step-Down DC-to-DC Regulator for Increased Efficiency

    Benefits & Features
    • Update rates up to 800 MSPS
    • Utilize switching regulators instead of linear regulators
    • 85% efficent with total power consumption at 0.9 W
    Products Used

    Available Design Resources

    CN0141:Powering the AD9788 800 MSPS TxDAC Digital-to-Analog Converter Using the ADP2105 Synchronous Step-Down DC-to-DC Regulator for Increased Efficiency

    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: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.13 Y  Material Info PCN 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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