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ST's New Ultra-low-dropout, Low Voltage Regulator for Mobile Devices


The LD56020's ultra-low drop, low quiescent current and short-circuit current foldback make the regulator ideal for mobile applications.


STMicroelectronics have released the new LD56020, which is a ultra-low drop-out voltage regulator operating from a supply voltage of 1.1V to 5.5V. The ultra-low drop, low quiescent current and short-circuit current foldback make the LD56020 ideal for low power battery-operated applications.

Click for Larger Image - New Ultra-low-dropout, Low Voltage Regulator for Mobile Devices The LD56020 has extremely low dropout voltage of just 190mV (max. at full load) and maximum quiescent current of 25µA at light load. An external enable pin allows control logic from a microcontroller or microprocessor to put the regulator into standby mode, which reduces current to below 0.1µA.

With supply-voltage rejection (SVRIN) of 90dB (1kHz, 20mA) and output noise of just 8.8µVRMS (10Hz to 100kHz), the STMircoelectronics LD56020 provides a clean power rail for low-voltage digital circuitry. The circuit requires only one small ceramic capacitor at each of the input and output terminals to stabilize the voltage. This reduces the bill of materials required and lowers the overall component count, combined with the regulator's tiny chip-scale package (CSP) outline of 0.65mm x 0.65mm, this ensures a very compact circuit footprint.

The regulator integrates protection features such as short-circuit current foldback and under-voltage lockout to prevent excessive dissipation in the event of a system fault. Over-temperature protection and an internal discharge path is also provided.

Features of the LD56020 Low-Dropout Voltage Regulator include:

  • Input voltage from 1.1 V to 5.5 V
  • Ultra-low dropout voltage (190 mV max. at 200 mA load)
  • Low ground current (18 µA typ. at no load)
  • Output voltage tolerance: ± 2 %
  • 200 mA guaranteed output current
  • Ultra-low output noise: 8.8 µVRMS (10 Hz to 100 kHz)
  • Logic-controlled electronic shutdown
  • Thermal shutdown
  • Output active discharge function

More information on the LD56020 Low-Dropout Voltage Regulator is available on the ST website at STMicroelectronics LD56020 product page.


The STMicroelectronics website address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date, 17th May, 2022]