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LDO regulators

Image of LDO regulator subbrandAn LDO (low-dropout) is a linear voltage regulator designed to operate with a very low input-to-output voltage differential (dropout voltage). It aims to minimize the power dissipated as heat on the device and increase conversion efficiency.

ST's LDO regulators offer an optimal combination of:

  • low dropout voltage
  • low quiescent current (low IQ)
  • fast transient response
  • low noise
  • and good ripple rejection

 


Product overview

Ultra-low dropout

The dropout voltage is the defined minimum difference between the input voltage and the desired output voltage at a specified output current. An ultra-low-dropout voltage extends the lifetime of battery-operated devices, as it allows the LDO to maintain a high current output even when the battery voltage is reduced as the battery is discharged. Furthermore, it reduces power dissipation.

Image of ST ultra low dropout ldos product overview

Low quiescent current

Quiescent current is the current used to power an LDO’s internal circuitry. LDOs with low quiescent current are essential for maintaining efficient operation and prolonging battery life, and are a natural choice for applications with extended standby times.

 

Image of ST LDO Iq product overview


High PSRR/Low noise

PSRR is a measure of the LDO’s ability to endure a changing input voltage without letting it affect the output, while low noise LDOs are designed to minimize the intrinsic noise. Maintaining the expected output voltage with high precision and low noise is vital when powering sensitive devices or when the supply voltage is derived from a noisy source.

Image of ST high psrr ldos product overview

 

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Product highlights

ST LD57100 product image

LD57100 - Space-saving LDO is ideal for low-power handhelds

Housed in a compact package, the LD57100 voltage regulator for battery-operated devices features ultra-low dropout voltage at 1 A load. Thermal protection and shutdown mode included.

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ST LD49100 product image

LD49100 - 1 A, low quiescent current, low-noise voltage regulator with soft start - Automotive grade

The LD49100 provides 1 A maximum current with an input voltage range from 1.5 V to 5.5 V and a typical dropout voltage of 200 mV. The device is stable with ceramic capacitors on the input and output.

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Tools

ST STEVAL-LDO001V1 board image

STEVAL-LDO001V1

Quad high performance LDO evaluation board based on LDBL20, LDLN025, LD39130S and STLQ020

The STEVAL-LDO001V1 board features the following high performance low dropout linear voltage regulators in miniature packages:

  • LDBL20 200 mA high PSSR low quiescent current in ST STAMP™ bumpless chip-scale package
  • LDLN025 250 mA low noise, low quiescent current in Flip-Chip4
  • LD39130S 300 mA ultra-low quiescent current in DFN6L
  • STLQ020 200 mA very-low quiescent current in DFN6L
     

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ST Vreg Finder app image

ST Vreg finder

The ST-VREG-FINDER is a free application for smartphones and tablets that enables a smart selection of products, both between linear and switching voltage regulators and in the voltage reference portfolio.

Learn more

 

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