1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. ADP5303


Features and Benefits

  • Input supply voltage range: 2.15 V to 6.50 V
  • Operates down to 2.00 V
  • Ultralow 240 nA quiescent current with no load
  • Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V
  • ±1.5% output accuracy over the full temperature range in pulse-width modulation (PWM) mode
  • Selectable hysteresis mode or PWM operation mode
  • Output current
    • Up to 50 mA in hysteresis mode
    • Up to 500 mA in PWM mode
  • VINOK flag to monitor input battery voltage
  • 100% duty cycle operation mode
  • 2 MHz switching frequency with optional synchronization input from 1.5 MHz to 2.5 MHz
  • Quick output discharge (QOD) option
  • UVLO, OCP, and TSD protection
  • 9-ball, 1.65 mm × 1.87 mm WLCSP
  • Junction temperature: −40°C to +125°C

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.

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 Production

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)

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADP5303ACBZ-1-R7 Material Declaration Reliability Data 9-Ball WLCSP (1.65mm x 1.87mm)
ADP5303ACBZ-2-R7 Material Declaration Reliability Data 9-Ball WLCSP (1.65mm x 1.87mm)
Wafer Fabrication Data

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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.