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ADP1850:  Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller

Product Details

Product Status:Recommended for New Designs

The ADP1850 is a configurable dual output or two-phase, single output dc-to-dc synchronous buck controller capable of running from commonly used 3.3 V to 12 V (up to 20 V) voltage inputs. The device operates in current mode for improved transient response and uses valley current sensing for enhanced noise immunity.

The architecture enables accurate current sharing between interleaved phases for high current outputs.

The ADP1850 is ideal in system applications requiring multiple output voltages: the ADP1850 includes a synchronization feature to eliminate beat frequencies between switching devices; provides accurate tracking capability between supplies and includes precision enable for simple, robust sequencing.

The ADP1850 provides high speed, high peak current drive capability with dead-time optimization to enable energy efficient power conversion. For low load operation, the device can be configured to operate in power saving mode (PSM) by skipping pulses and reducing switching losses to improve the energy efficiency at light load and standby conditions.

The accurate current limit (±6%) allows the power architect to design within a narrower range of tolerances and can reduce overall converter size and cost. The ADP1850 provides a configurable architecture capable of wide range input operation to provide the designer with maximum re-use opportunities and improved time to market. Additional flexibility is provided by external programmability of loop compensation, soft start, frequency setting, power saving mode, current limit and current sense gain can all be programmed using external components.

The ADP1850 includes a high level of integration in a small size package. The start-up linear regulator and the boot-strap diode for the high side drive are included. Protection features include: undervoltage lock-out, overvoltage, overcurrent/short-circuit and over temperature. The ADP1850 is available in a compact 32-lead LFCSP 5 mm × 5 mm thermally enhanced package.

High current single and dual output intermediate bus and point of load converters requiring sequencing and tracking capability, including converters for:
  • Point-of-load power supplies
  • Telecom base station and networking
  • Consumer
  • Industrial and instrumentation
  • Healthcare and medical

    • Wide range input: 2.75V to 20V
    • Power stage input voltage: 1V to 20V
    • Output voltage range: 0.6 V up to 90% VIN
    • Output current to more than 25 A per channel
    • Accurate current sharing between channels (interleaved)
    • Programmable frequency: 200 kHz to 1.5 MHz
    • 180° phase shift between channels for reduced input capacitance
    • ±0.85% Reference voltage accuracy from −40°C to +85°C
    • Integrated boost diodes
    • Power saving mode (PSM) at light loads
    • Accurate power good with internal pull-up resistor
    • See data sheet for additional features

    Functional Block Diagram for ADP1850


    Title Content Type File Type
    ADP1850: Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller Datasheet (Rev A, 04/2012) (pdf, 1258 kB) Data Sheets PDF
    AN-1119: Printed Circuit Board Layout Guidelines for Step-Down Regulators, Optimizing for Low Noise Design with Dual Channel Switching Controllers  (pdf, 99 kB) Application Notes 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-205: Evaluation Board for the ADP1850DP Step-Down DC-to-DC Controller  (pdf, 1943 kB) User Guides PDF
    UG-204: Evaluation Board for the ADP1850SP Step-Down DC-to-DC Controller  (pdf, 2078 kB) User Guides PDF
    ADP1850: 12.0 Vin, 8 Outputs at 2A to 8A  (pdf, 854 kB)
    [PRD1366] Proven design for powering Xilinx 7 series devices. Meets tolerance and sequencing guidelines set by Xilinx. Uses ADP1850 dual output synchronous buck controller.
    Power Reference Designs PDF
    ADP1850: Dual Output/2-Phase, Synchronous Switching Controller Brochure  (pdf, 1552 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
    ADP1850-77 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
    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

    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.

    ADP1850 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    ADP1850DP-EVALZ Status: Production Dual Phase, Interleaved Evaluation Board $60.00 Yes -
    ADP1850SP-EVALZ Status: Production Single Phase 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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