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.
Featured Videos
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.
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LDBL20
200 mA very 200 mA very low quiescent current linear regulator IC in (0.47x0.47) mm² ST STAMP™ package
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LDL212
1.2A Low Drop Linear Regulator IC
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LFXX
Very low drop voltage regulator with inhibit
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STLQ50
50mA, 3µA Supply current low drop linear regulator
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LD39050
500 mA low quiescent current and low noise voltage regulator
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LD57100
1A Ultra low dropout LDO with Bias
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LDLN025
250 mA ultra-low noise LDO
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LD49100
1 A, low quiescent current, low-noise voltage regulator with soft start - Automotive grade
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LD39015J
150 mA low quiescent current low noise voltage regulator
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ST1L05
Very low quiescent BiCMOS voltage regulator
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LDK130
300 mA low quiescent current very low noise LDO
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ST1L08
800 mA Ultra low drop, high PSRR voltage regulator
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LK112S
Low noise and low drop voltage regulator with shutdown function
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LD39150
Ultra low drop BiCMOS voltage regulator
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ST715
High input voltage - 85 mA LDO linear regulator
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LDK120
200 mA low quiescent current very low noise LDO
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L4940
1.5 A very low drop voltage regulator IC
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LD49150
1.5 A ultra low dropout voltage regulator
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LD39080
Ultra low drop BICMOS voltage regulator
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LD49300
3A Very low drop for low output voltage regulator
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LDCL015
150 mA capless ultra low drop linear regulator ICs
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LM2931
Very low drop voltage regulators with inhibit function
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LK112
Low noise and low drop voltage regulator with shutdown function
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L4941
Very low drop 1A regulator
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LDLN050
500 mA, high performance low dropout linear regulator
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LDL112
1.2 A low quiescent current LDO with reverse current protection
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LDLN030
300 mA ultra-low noise LDO with Power Good and Soft Start
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L6932
High Performance 2A ULDO Linear Regulator
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LD39115J
150 mA low quiescent current low noise voltage regulator
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LDK715
High input voltage 85 mA LDO linear regulator
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LD39030SJ
300 mA low quiescent current soft-start, low noise voltage regulator
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ST730
300 mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
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LDF
1A Very low drop voltage regulator IC
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LD2980
Ultra low drop voltage regulators compatible with low ESR output capacitors
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LEXX
Very low-dropout voltage regulator with inhibit function
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KFXX
Very low drop voltage regulators with inhibit
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LD56050
500mA ultra low dropout linear regulator with bias supply
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LD59030
300 mA very low dropout current linear regulator IC
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LDS3985
Very low drop and low noise BiCMOS 300 mA voltage regulator
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LD59015
150 mA low noise high PSRR linear voltage regulator
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LDLN015
150 mA - ultra low noise - high PSRR linear voltage regulator IC
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LDK320
200 mA low quiescent current and high PSRR voltage regulator
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LDL1117
1.2 A High PSRR low dropout linear voltage regulator
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LD39015
150 mA low quiescent current low noise voltage regulator
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LD29150
1.5 A, very low drop voltage regulators
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LD39200
2 A high PSRR ultra low drop linear regulator with reverse current protection
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LD3985
Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible
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LDFM
500 mA very low drop voltage regulator
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LD39130S
300 mA very low quiescent current Linear regulator IC with automatic Green mode
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LD59150
1.5A Low Dropout Linear Regulator with Programmable Soft-Start
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LD56100
1A very low dropout fast transient ultra-low noise linear regulator
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LD39030
300 mA very low quiescent current linear regulator IC
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STLQ020
200 mA ultra-low quiescent current LDO
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LD39100
1 A low quiescent current low noise voltage regulator
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LDO40L
400 mA, 38 V low-dropout regulator, with 45µA quiescent current
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LD59100
1A Ultra Low-Dropout regulator with Reverse Current Protection
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LDK220
200 mA low quiescent current and low noise LDO
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ST732
300mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
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STLQ015
150 mA - ultra low quiescent current linear voltage regulator
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LD29300
3 A, very low drop voltage regulators
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L4931
Very low drop voltage regulators with inhibit
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LD2981
Ultra low drop voltage regulators with inhibit low ESR output
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LD29080
800 mA fixed and adjustable output very low drop voltage regulator
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LD39020
200 mA very low quiescent current Linear regulator IC
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LD2985
Very low drop and low noise voltage regulator with inhibit function
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LD39030
300 mA very low quiescent current linear regulator IC
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LDBL20
200 mA very 200 mA very low quiescent current linear regulator IC in (0.47x0.47) mm² ST STAMP™ package
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LD59015
150 mA low noise high PSRR linear voltage regulator
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STLQ020
200 mA ultra-low quiescent current LDO
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LD39100
1 A low quiescent current low noise voltage regulator
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STLQ50
50mA, 3µA Supply current low drop linear regulator
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LD39050
500 mA low quiescent current and low noise voltage regulator
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LDLN015
150 mA - ultra low noise - high PSRR linear voltage regulator IC
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LDLN025
250 mA ultra-low noise LDO
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LD39115J
150 mA low quiescent current low noise voltage regulator
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ST732
300mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
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LD39015
150 mA low quiescent current low noise voltage regulator
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STLQ015
150 mA - ultra low quiescent current linear voltage regulator
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LDK715
High input voltage 85 mA LDO linear regulator
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LD39015J
150 mA low quiescent current low noise voltage regulator
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LDK130
300 mA low quiescent current very low noise LDO
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LD39200
2 A high PSRR ultra low drop linear regulator with reverse current protection
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LD39030SJ
300 mA low quiescent current soft-start, low noise voltage regulator
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ST715
High input voltage - 85 mA LDO linear regulator
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LDK120
200 mA low quiescent current very low noise LDO
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LD39020
200 mA very low quiescent current Linear regulator IC
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ST730
300 mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
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LD39130S
300 mA very low quiescent current Linear regulator IC with automatic Green mode
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LD59150
1.5A Low Dropout Linear Regulator with Programmable Soft-Start
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LD56100
1A very low dropout fast transient ultra-low noise linear regulator
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LD59030
300 mA very low dropout current linear regulator IC
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LDBL20
200 mA very 200 mA very low quiescent current linear regulator IC in (0.47x0.47) mm² ST STAMP™ package
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LD39100
1 A low quiescent current low noise voltage regulator
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LD59015
150 mA low noise high PSRR linear voltage regulator
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LD39050
500 mA low quiescent current and low noise voltage regulator
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LDLN050
500 mA, high performance low dropout linear regulator
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LDLN030
300 mA ultra-low noise LDO with Power Good and Soft Start
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LDLN015
150 mA - ultra low noise - high PSRR linear voltage regulator IC
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LD59100
1A Ultra Low-Dropout regulator with Reverse Current Protection
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LDLN025
250 mA ultra-low noise LDO
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LD39115J
150 mA low quiescent current low noise voltage regulator
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LD39015
150 mA low quiescent current low noise voltage regulator
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LD39200
2 A high PSRR ultra low drop linear regulator with reverse current protection
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LD39030SJ
300 mA low quiescent current soft-start, low noise voltage regulator
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LD39020
200 mA very low quiescent current Linear regulator IC
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LD3985
Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible
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LD59030
300 mA very low dropout current linear regulator IC
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LD56050
500mA ultra low dropout linear regulator with bias supply
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LDL212
1.2A Low Drop Linear Regulator IC
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LDS3985
Very low drop and low noise BiCMOS 300 mA voltage regulator
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LD39050
500 mA low quiescent current and low noise voltage regulator
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LDK320
200 mA low quiescent current and high PSRR voltage regulator
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LD57100
1A Ultra low dropout LDO with Bias
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LD39015
150 mA low quiescent current low noise voltage regulator
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LD49100
1 A, low quiescent current, low-noise voltage regulator with soft start - Automotive grade
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LD39200
2 A high PSRR ultra low drop linear regulator with reverse current protection
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LDK130
300 mA low quiescent current very low noise LDO
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ST1L08
800 mA Ultra low drop, high PSRR voltage regulator
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LK112S
Low noise and low drop voltage regulator with shutdown function
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LD39150
Ultra low drop BiCMOS voltage regulator
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LDK120
200 mA low quiescent current very low noise LDO
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LD3985
Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible
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LDFM
500 mA very low drop voltage regulator
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L4940
1.5 A very low drop voltage regulator IC
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LD39130S
300 mA very low quiescent current Linear regulator IC with automatic Green mode
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LD49150
1.5 A ultra low dropout voltage regulator
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LD59150
1.5A Low Dropout Linear Regulator with Programmable Soft-Start
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LD39080
Ultra low drop BICMOS voltage regulator
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LD49300
3A Very low drop for low output voltage regulator
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LDCL015
150 mA capless ultra low drop linear regulator ICs
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LD56100
1A very low dropout fast transient ultra-low noise linear regulator
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LD39100
1 A low quiescent current low noise voltage regulator
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L4941
Very low drop 1A regulator
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LDL112
1.2 A low quiescent current LDO with reverse current protection
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LDO40L
400 mA, 38 V low-dropout regulator, with 45µA quiescent current
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LD59100
1A Ultra Low-Dropout regulator with Reverse Current Protection
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LD39115J
150 mA low quiescent current low noise voltage regulator
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STLQ015
150 mA - ultra low quiescent current linear voltage regulator
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LDK220
200 mA low quiescent current and low noise LDO
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L6932
High Performance 2A ULDO Linear Regulator
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L4931
Very low drop voltage regulators with inhibit
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LD39030SJ
300 mA low quiescent current soft-start, low noise voltage regulator
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LDF
1A Very low drop voltage regulator IC
