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ADP1872:  Synchronous Current-Mode Buck Controller with Constant On-time and 0.6 V Reference Voltage

Product Details


The ADP1872/ADP1873 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current-sense gain, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by utilizing valley current-mode control architecture. This allows the ADP1872/ ADP1873 to drive all N-channel power stages to regulate output voltages as low as 0.6 V.

The ADP1873 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1873) section for more information).

Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1872/ADP1873 are well suited for a wide range of applications. These ICs not only operate from a 2.75 V to 5.5 V bias supply, but also can accept a power input as high as 20 V.

In addition, an internally fixed soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a pre-charged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulse-width modulation (PWM) option, reduce the external part count and improve efficiency.

The ADP1872/ADP1873 operate over the −40°C to +125°C junction temperature range and are available in a 10-lead MSOP.

Applications
  • Telecom and networking systems
  • Mid to High End servers
  • Set-top boxes
  • DSP core power supplies
  • FEATURES and BENEFITS

    • Power input voltage as low as 2.75 V to 20 V
    • Bias supply voltage range:
      2.75 V to 5.5 V
    • Minimum output voltage: 0.6 V
    • 0.6 V reference voltage with ±1.0% accuracy
    • Supports all N-channel MOSFET power stages
    • Available in 300 kHz, 600 KHz, and 1.0 MHz options
    • No Current Sense Resistor Required
    • Power saving mode (PSM) for light loads (ADP1873 only)
    • Resistor-programmable current-sense gain
    • Thermal overload protection
    • Short-circuit protection
    • See data sheet for additional features

    Functional Block Diagram for ADP1872

    Documentation

    Title Content Type File Type
    ADP1872/ADP1873: Synchronous Current-Mode with Constant On-Time, PWM Buck Controller Data Sheet (Rev B, 07/2012) (pdf, 2049 kB) Data Sheets PDF
    AN-1075: Synchronous Inverse SEPIC Using the ADP1870/ADP1872 Provides High Efficiency for Noninverting Buck/Boost Applications  (pdf, 167 kB)
    Discusses using the ADP1870/ADP1872 as an inverse single-ended primary inductor converter (SEPIC), also known as the Zeta converter, that can operate in either buck or boost mode, decreasing or increasing the input voltage to a desired regulated voltage, with minimal cost, component count, and power loss.
    Application Notes PDF
    CN-0190: Robust, Multivoltage, High Efficiency, 25 W Universal Power Supply Module with 6 V to 14 V Input  (pdf, 357 kB) Circuit Note 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-057: Evaluating the ADP1872/ADP1873 PWM Buck Controllers  (pdf, 1277 kB) User Guides PDF
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    ADP187x Buck Designer 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
    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.

    Product Recommendations & Reference Designs

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    Price, packaging, availability

    ADP1872 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADP1872ARMZ-0.3-R7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $1.03 Y  Material Info PCN Purchase Sample
    ADP1872ARMZ-0.6-R7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $1.03 Y  Material Info PCN Purchase Sample
    ADP1872ARMZ-1.0-R7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $1.03 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.

    ADP1872 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADP1872-0.3-EVALZ Status: Production Evaluation Board $60.00 Yes -
    ADP1872-0.6-EVALZ Status: Production Evaluation Board $60.00 Yes -
    ADP1872-1.0-EVALZ 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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