New Industry Products

1A Ultra Low-Dropout Regulator with Reverse Current Protection

July 23, 2018 by Paul Shepard

The LD59100 from STMicroelectronics is a 1 A LDO regulator designed for use in various environments. Its N-MOS topology allows reduction of the Rdson of the pass-element, maintaining a very low-dropout voltage even with very low input power supply voltage.

The device features very high PSRR characteristics over a wide frequency band, rendering it suitable for use as a secondary regulator for noise-sensitive applications.

The enable function can be used to further decrease the overall current consumption in shutdown mode.

The LD59100 includes protection features, such as current limit, thermal shutdown and reverse output current protection.

Applications are expected to include: Post-regulation generic POL, Portable equipment, Industrial applications, Telecom infrastructure, and similar systems.

Key Features

  • Input voltage range: 2.2V to 5.5V
  • Ultra low-dropout: 200mV typ. at 1A
  • NMOS topology
  • Very high PSRR: 78dB @ 100Hz, 70 dB@ 100kHz
  • Very fast response to load variation
  • Stable with 1μF capacitor
  • Thermal shutdown
  • Current limit
  • Adjustable from 1.2V
  • High output voltage accuracy:
    • 1% typ. (3% max.)