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ADP2503:  600 MA, 2.5 MHZ BUCK-BOOST DC-TO-DC CONVERTER

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 ...More

ADP2503:  600 MA, 2.5 MHZ BUCK-BOOST DC-TO-DC CONVERTER

Product Description

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

    • Data Sheet, Rev. A, 08/09

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    • 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
    • Vin Range: 2.3V-5.5V
    • Boost: Yes
    • Buck: Yes
    • Inverting: No
    • Iout (max): 0.6A
    • Supply Current : 50µA
    • Switching Frequency: 2.5MHz
    • Vout Preset Summary: 6 Options/2.8V-5V
    • Vout Adj Options: ---,2.5V to 5V

    ADP2503 Typical Application Circuit

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    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.