50 mA/500 mA, Ultralow Power Step-Down Regulator with Battery Voltage Monitor

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Product Details

The ADP5303 is high efficiency, ultralow quiescent current step-down regulator that draws only 240 nA quiescent current to regulate the output at no load.</p>

The ADP5303 runs from an input voltage of 2.15 V to 6.50 V, allowing the use of multiple alkaline or NiMH cells, Li-Ion cells, or other power sources. The output voltage is selectable from 0.8 V to 5.0 V by an external VID resistor and a factory fuse. The total solution requires only four tiny external components.

The ADP5303 can operate between hysteresis mode and PWM mode via the SYNC/MODE pin. In hysteresis mode, the regulator achieves excellent efficiency at less than 1 mW and provides up to 50 mA of output current. In PWM mode, the regulator produces a lower output ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables very efficient power management to meet both long battery life and low system noise requirements.

The ADP5303 integrates an ultralow power comparator with a factory programmable voltage reference to monitor the input battery voltage. The regulator runs at a 2 MHz switching frequency in PWM mode and the SYNC/MODE pin can be synchronized to an external clock from 1.5 MHz to 2.5 MHz.

Other key features in the ADP5303 include separate enabling, QOD, and safety features such as overcurrent protection (OCP), thermal shutdown (TSD), and input undervoltage lockout (UVLO).

The ADP5303 is available in 9-ball, 1.65 mm × 1.87 mm WLCSP package rated for the −40°C to +125°C junction temperature range.


  • Energy (gas, water) metering
  • Portable and battery-powered equipment
  • Medical applications
  • Keep-alive power supply

Product Lifecycle

icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits


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EVAL-ADP5303 Circuit Diagram

Product Details

The ADP5303 is an ultralow power, synchronous step-down dc-to-dc regulator in a 9-lead WLCSP package. The ADP5303 runs from input voltages of 2.06 V to 6.5 V and requires minimal external components to provide a high efficiency solution with an integrated power switch, synchronous rectifier, and internal compensation.

The ADP5303 evaluation board provides an easy way to evaluate the device. This user guide describes how to quickly set up the board to collect performance data.

Complete information about the ADP5303 is available in the ADP5303 data sheet, which should be consulted in conjunction with user guide UG-881 when using the evaluation board.

Design Resources

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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.

ADP5303 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints


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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.

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Evaluation Boards Pricing displayed is based on 1-piece.
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.