Low-Dropout Voltage Regulator with Thermal Shutdown for Energy-Conscious Applications

Published  May 18, 2022   0
LD56020 Low-Dropout Voltage Regulator

STMicroelectronics has introduced the new 200mA low-dropout voltage regulator LD56020 that operates with a supply from 1.1V to 5.5V and has low output noise for applications that demand excellent stability and long battery runtime. Ideal for mobiles, vision sensors, and wireless modules, the LD56020 regulator has an extremely low dropout voltage of just 190mV (max. at full load) and a maximum quiescent current of 25µA at light load. 

With supply-voltage rejection (SVRIN) of 90dB (1kHz, 20mA) and output noise of just 8.8µVRMS (10Hz to 100kHz), the LD56020 provides a clean power rail for low-voltage digital circuitry. The circuit is stabilized with only one small ceramic capacitor at each of the input and output terminals. In addition to minimizing the bill of materials, the low overall component count combines with the regulator’s tiny chip-scale package (CSP) outline of 0.65mm x 0.65mm to ensure a compact circuit footprint with low impact on PCB size.

Key Features

  • 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 % overtemperature, ± 1% at 25 °C

  • 200 mA guaranteed output current

  • Ultra-low output noise: 8.8 µVRMS (10 Hz to 100 kHz)

  • 50 mV output voltage steps (available on request) from 0.6 V to 4.0 V

  • Logic-controlled electronic shutdown

  • Thermal shutdown

  • Output active discharge function

The regulator integrates protection features including short-circuit current foldback and under-voltage lockout to prevent excessive dissipation in the event of a system fault. There is also over-temperature protection and an internal discharge path. The LD56020 regulator is in production now in the CSP-4 chip-scale package, priced from $0.14 for orders of 1000 pieces.