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JP Rev. A
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Overview

Features and Benefits

  • 1 mm height profile
  • Compact PCB footprint
  • Seamless transition between modes
  • 38 μA typical quiescent current
  • 2.5 MHz operation enables 1.5 μH inductor
  • Input voltage: 2.3 V to 5.5 V
  • Fixed output voltage: 2.8 V to 5.0 V
  • See data sheet for additional features

Product Details

The ADP2503 / ADP2504 are high efficiency, low quiescent current step-up/step-down dc-to-dc converters that can operate at input voltages greater than, less than, or equal to the regulated output voltage. The power switches and synchronous rectifiers are internal to minimize external part count. At high load currents, the ADP2503 / ADP2504 use a current-mode, fixed frequency pulse-width modulation (PWM) control scheme for optimal stability and transient response. To ensure the longest battery life in portable applications, the ADP2503 / ADP2504 have an optional power save mode that reduces the switching frequency under light load conditions. For wireless and other low noise applications where variable frequency power save mode may cause interference, the logic control input sync forces fixed frequency PWM operation under all load conditions.

The ADP2503 / ADP2504 can run from input voltages between 2.3 V and 5.5 V, allowing single lithium or lithium polymer cell, multiple alkaline or NiMH cells, PCMCIA, USB, and other standard power sources. The ADP2503 / ADP2504 have fixed output options, or using the adjustable model, the output voltage can be programmed through an external resistor divider. Compensation is internal to minimize the number of external components.

During logic-controlled shutdown, the input is disconnected from the output and draws less than 1 μA from the input source. Operating as boost converters, the ADP2503 / ADP2504 feature a true load disconnect function that isolates the load from the power source. Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup.

APPLICATIONS

  • Wireless handsets
  • Digital cameras/portable audio players
  • Miniature hard disk power supplies
  • USB powered devices

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

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  • Data Sheets (1)
  • Application Notes (1)
  • User Guides (2)
  • Informational (1)
  • Circuit Note (1)
  • Technical Articles (4)
    • Document Type

    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    LTspice

    Models for the following parts are available in LTspice:

    ADP2503-2.8
    ADP2503-3.3
    ADP2503-3.5
    ADP2503-4.2
    ADP2503-4.5
    ADP2503-5.0
    ADP2503-ADJ

    Design Tools

    ADP2503/4 Buck Boost Regulator Design Tool

    Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.

    Reference Designs (1)

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    ADP2503 Material Declaration
    Quality And Reliability
    Symbols and Footprints

    PCN-PDN Information

    Select Model
    • ADP2503ACPZ-3.3-R7 Production
    • ADP2503ACPZ-4.2-R7 Production
    • ADP2503ACPZ-4.5-R7 Production
    • ADP2503ACPZ-5.0-R7 Production
    • ADP2503ACPZ-R7 Production

    Support & Discussions

    ADP2503 Discussions

    RE: ADP2503 - Startup problem where VOUT stays at 0V
    8 week(s) ago in Power Management
    All ADP2503 Discussions
    ADP2503 Contact ADI Technical Support »
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    ADP2503 Contact ADI Technical Support » ADP2503 Ask your question »

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