Features and Benefits

  • Input voltage: 2.3 V to 5.5 V
  • Peak efficiency: 95%
  • 3 MHz fixed frequency operation
  • Low quiescent current: 23 μA
  • Ultralow shutdown current: 0.2 μA (typical)
  • VSEL pin for simple dynamic voltage scaling (DVS) 
  • 100% duty cycle low dropout mode
  • Internal synchronous rectifier, compensation, and soft start
  • Current overload and thermal shutdown protection
  • Small, 6-ball, 1 mm × 1.5 mm WLCSP package

Product Details

The ADP2147 is a high efficiency, low quiescent current, step-down (buck) dc-to-dc regulator with an output voltage that can be switched between two different settings under the control of a select pin. The total solution requires only three tiny external components.

The buck regulator automatically switches operating modes, depending on the load current level, to maximize efficiency. At high output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving the light-load efficiency.

The ADP2147 runs on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cells, multiple alkaline or NiMH cells, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.

The ADP2147 is available with fixed output voltages from 0.8 V to 3.3 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2147 has an internal soft start and is internally compensated. During logic controlled shutdown, the input is disconnected from the output, and the ADP2147 draws less than 0.2 μA (typical) 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. The ADP2147 is available in a 6-ball WLCSP.


  • PDAs and palmtop computers
  • Wireless handsets
  • Digital audio portable media players
  • Digital cameras, GPS navigation units
  • Low power portable medical equipment 

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.

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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.