Industry’s highest ultra-light-load power conversion efficiency, is Analog Devices’ claim for its latest buck converter – no load quiescent current through the ADP5301 is an impressive 180nA.
Depending on input and load, this can mean >90% efficiency across 5µA to 50mA output.
It also offers a novel way to select between multiple internally-set fixed output voltages (see table above) – Resistor Rvid is read at start-up and this value is used to select internal voltage-setting feedback dividers. This keeps the super high (50Mohm, and therefore low-power) dividers safely on-die and safely away from humidity and dirt. THere are actually two factory set voltage ranges: 1.2-3.6V, or 0.8-5.0V – see the data sheet for more.
Intended for IoT applications, input range is 2.15 to 6.5V, and once it is working this can drop to 2.0V.
Switching is at 2MHz, with external clock synchronisation from 1.2 to 2.5MHz.
The high efficiency and low quiescent figures above come from operating in hysteresis mode. For higher outputs (500mA), and less noise, at the expense of higher operating current, there is a selectable PWM mode.
There are actually four devices – the 5301, 00, 02 and 03 covering two options: 9ball WLCSP (<3.1mm²) or 10lead LFCSP, and Vout OK Flag or Vin OK flag.
“The buck regulator is designed to deliver maximum power for a longer period of time than previously achievable and is ideally suited for IoT applications, including wireless sensor networks and wearable devices such as fitness bands and smartwatches,” said ADI.
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