An 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.
Our LDO regulator portfolio features best in class devices, including:
LDO regulators vs linear regulators
Linear voltage regulators are a cost-effective means to deliver a stable and regulated output voltage, with design simplicity and few external components. But LDO regulators provide the best cost-performance tradeoff in applications where the output current is less than few amps and the output voltage is close to that of the input.
LDO regulators vs switching converters
Compared to DC-DC switching converters, LDO regulators do not generate ripple, therefore they offer a very clean supply voltage. They require few design efforts thanks to the minimum number of external passive components needed.
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
In particular, our ultra-low dropout regulators are ideal for battery-powered consumer and industrial applications, as well as portable healthcare devices, as a result of:
- ultra-low quiescent current (down to 0.3 µA) which extends battery runtime
- tiny package options, including the 0.65 x 0.65 mm flip-chip and 0.47 x 0.47 mm STSTAMP™ to achieve the smallest footprint
Signal fidelity is maintained over a wide range of input voltages and output currents all along the signal path, thanks to the high PSRR (power supply rejection rate) and low noise.
Recommended for you
Find the best design solution thanks to high-performances Quad-LDO evaluation board
The STEVAL-LDO001V1 allows smart evaluation of four ST's high-performance low-dropout linear voltage regulators specially designed for extend battery life in portable smart devices. Thanks to state-of-the-art technologies, designs and innovative packaging, designers can select the best solution in terms of ultra-low quiescent current, ultra-low noise and high PSRR, automatic green mode and miniature packages such as Flip-Chip or ST STAMP™.
Ultra-tiny low-dropout regulator in breakthrough bumpless chip-scale package
The LDBL20 is a powerful 200 mA LDO in a tiny 0.47 x 0.47 mm innovative ST STAMP™ chip-scale package. The input voltage can range from 1.5 to 5.5 V, with 200 mV typical dropout. Rejection (PSRR) of 80 dB at 100 Hz and 50 dB at 100 kHz simplifies filtering over a wide frequency range to provide a stable rail for low-power circuitry in battery-operated applications. Quiescent current of 20 µA no-load, 100 µA full-load, and 0.3 µA in standby help maximize efficiency under all operating conditions.
More from Low Dropout (LDO) Linear Regulators portfolio
- LDBL20 200 mA very low quiescent current linear regulator IC in (0.47x0.47) mm² ST STAMP™ package
- LDL212 1.2A Low Drop Linear Regulator IC
- LFXX Very low drop voltage regulator with inhibit
- STLQ50 50mA, 3µA Supply current low drop linear regulator
- LD39050 500 mA low quiescent current and low noise voltage regulator
- LD57100 1 A ultra low-dropout LDO with bias
- LDLN025 250 mA ultra-low noise LDO
- LD49100 1 A, low quiescent current, low-noise voltage regulator with soft start - Automotive grade
- LD39015J 150 mA low quiescent current low noise voltage regulator
- ST1L05 Very low quiescent BiCMOS voltage regulator
- LDK130 300 mA low quiescent current very low noise LDO (automotive for SOT23-5L package)
- ST1L08 800 mA ultra low drop, high PSRR voltage regulator
- LK112S Low noise and low drop voltage regulator with shutdown function
- LD39150 Ultra low drop BiCMOS voltage regulator
- ST715 High input voltage, 85 mA LDO linear regulator
- LDK120 200 mA low quiescent current very low noise LDO
- L4940 1.5 A very low drop voltage regulator IC
- LD39080 Ultra low drop BICMOS voltage regulator
- LDCL015 150 mA capless ultra low drop linear regulator ICs
- LM2931 Very low drop voltage regulators with inhibit function
- LK112 Low noise and low drop voltage regulator with shutdown function
- L4941 Very low drop 1A regulator
- LDLN050 500 mA, high performance low dropout linear regulator
- LDL112 1.2 A low quiescent current LDO with reverse current protection
- LDLN030 300 mA ultra-low noise LDO with Power Good and Soft Start
- LD39115J 150 mA low quiescent current low noise voltage regulator
- LDK715 High input voltage 85 mA LDO linear regulator
- LD39030SJ 300 mA low quiescent current soft-start, low noise voltage regulator
- ST730 300 mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
- LDF 1 A Very low drop voltage regulator
- LD2980 Ultra low drop voltage regulators compatible with low ESR output capacitors
- LEXX Very low-dropout voltage regulator with inhibit function
- KFXX Very low drop voltage regulators with inhibit
- LD56050 500 mA ultra-low dropout linear regulator with bias supply
- LD59030 300 mA very low dropout linear regulator IC
- LDS3985 Very low drop and low noise BiCMOS 300 mA voltage regulator
- LD59015 150 mA low noise high PSRR linear voltage regulator
- LDLN015 150 mA - ultra low noise - high PSRR linear voltage regulator IC
- LDK320 200 mA low quiescent current and high PSRR voltage regulator
- LDL1117 1.2 A High PSRR low dropout linear voltage regulator
- LD39015 150 mA low quiescent current low noise voltage regulator
- LD29150 1.5 A, very low drop voltage regulators
- LD39200 2 A high PSRR ultra low drop linear regulator with reverse current protection
- LD56020 Low input voltage 200 mA ultra low dropout linear regulator
- LD3985 Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible
- LDFM 500 mA very low drop voltage regulator
- KITLDO0221 High-performance LDO Sample Kit
- LD39130S 300 mA very low quiescent current Linear regulator IC with automatic Green mode
- LD59150 1.5 A Low Dropout Linear Regulator with Programmable Soft-Start
- LD56100 1 A very low dropout fast transient ultra-low noise linear regulator
- LD39030 300 mA very low quiescent current linear regulator IC
- STLQ020 200 mA ultra-low quiescent current LDO
- LD39100 1 A low quiescent current low noise voltage regulator
- LDO40L 400 mA, 38 V low-dropout regulator, with 45 µA quiescent current
- LD59100 1A Ultra Low-Dropout regulator with Reverse Current Protection
- LDK220 200 mA low quiescent current and low noise LDO
- ST732 300mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
- STLQ015 150 mA - ultra low quiescent current linear voltage regulator
- LD29300 3 A, very low drop voltage regulators
- L4931 Very low drop voltage regulators with inhibit
- LD2981 Ultra low drop voltage regulators with inhibit low ESR output
- LD29080 800 mA fixed and adjustable output very low drop voltage regulator
- LD39020 200 mA very low quiescent current Linear regulator IC
- LD2985 Very low drop and low noise voltage regulator with inhibit function