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STMicroelectronics offers fixed and adjustable output LDO regulators featuring an optimal combination of power supply rejection ratio, low noise, quiescent current, and tiny packages. They are ideal for battery-powered applications (tablets, smartphones, portable healthcare, and fitness) where both optimum heat dissipation and small dimensions are key factors.

Low Drop Out Regulators (LDO)

Vin Iout Vout Adjustable Voltage
Selecting a Vin and/or Iout value above will display all products with that value and higher
Part
Number
Datasheet icon link Vin - Max (V) Iout - Max (mA) Vout (V)   Package
Description
Ultra LDO Low Noise/
High PSRR
Low
Quiescent Current
Tiny
Pkg
Dropout
Voltage [mV]
Noise [uV RMS] PSRR [dB] Quiescent
Current [uA]
LD39015M08R Datasheet icon link 5.5 150 0.8V NotV SOT 23 5L 80 29 65 18
LD39015M10R Datasheet icon link 5.5 150 1V NotV SOT 23 5L 80 29 65 18
LD39015M125R Datasheet icon link 5.5 150 1.25V NotV SOT 23 5L 80 29 65 18
LD39015M12R Datasheet icon link 5.5 150 1.2V NotV SOT 23 5L 80 29 65 18
LD39015M15R Datasheet icon link 5.5 150 1.5V NotV SOT 23 5L 80 29 65 18
LD39015M18R Datasheet icon link 5.5 150 1.8V NotV SOT 23 5L 80 29 65 18
LD39015M25R Datasheet icon link 5.5 150 2.5V NotV SOT 23 5L 80 29 65 18
LD39015M33R Datasheet icon link 5.5 150 3.3Vv NotV SOT 23 5L 80 29 65 18
LD39015XG08R Datasheet icon link 5.5 150 0.8V NotV SOT 666 80 29 65 18
LD39015XG10R Datasheet icon link 5.5 150 1V NotV SOT 666 80 29 65 18
LD39050PU25R Datasheet icon link 5.5 500 2.5V NotV VFDFPN 6 3X3 0,95 PITCH   200 30 65 20
LD39050PU33R Datasheet icon link 5.5 500 3.3Vv NotV VFDFPN 6 3X3 0,95 PITCH   200 30 65 20
LD39050PUR* Datasheet icon link 5.5 500 0.8V 0.8V 1V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable VFDFPN 6 3X3 0,95 PITCH   200 30 65 20
LD39080DT18-R Datasheet icon link 6 800 1.8V NotV TO-252 DPAK Cu Wire       150 100 55 1000
LD39080DT25-R Datasheet icon link 6 800 2.5V NotV TO-252 DPAK Cu Wire       150 100 55 1000
LD39080DT33-R Datasheet icon link 6 800 3.3Vv NotV TO-252 DPAK Cu Wire       150 100 55 1000
LD39080PT-R* Datasheet icon link 6 800 1.22V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable PPACK 5 LEADS       150 100 55 1000
LD39080PT18-R Datasheet icon link 6 800 1.8V NotV PPACK 5 LEADS       150 100 55 1000
LD39080PT25-R Datasheet icon link 6 800 2.5V NotV PPACK 5 LEADS       150 100 55 1000
LD39080PT33-R Datasheet icon link 6 800 3.3Vv NotV PPACK 5 LEADS       150 100 55 1000
LD39100PUR* Datasheet icon link 5.5 1000 0.8V 0.8V 1V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable VFDFPN 6 3X3 0,95 PITCH   200 30 65 20
LD39115J12R Datasheet icon link 5.5 150 1.2V NotV CSPS0.4 4-6 80 33 74 20
LD39115J15R Datasheet icon link 5.5 150 1.5V NotV CSPS0.4 4-6 80 33 74 20
LD39115J25R Datasheet icon link 5.5 150 2.5V NotV CSPS0.4 4-6 80 33 74 20
LD39115J33R Datasheet icon link 5.5 150 3.3Vv NotV CSPS0.4 4-6 80 33 74 20
LD39150DT18-R Datasheet icon link 6 1500 1.8V NotV TO-252 DPAK Cu Wire       200 100 65 1000
LD39150DT25-R Datasheet icon link 6 1500 2.5V NotV TO-252 DPAK Cu Wire       200 100 65 1000
LD39150DT33-R Datasheet icon link 6 1500 3.3Vv NotV TO-252 DPAK Cu Wire       200 100 65 1000
LD39150PT-R* Datasheet icon link 6 1500 1.22V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable PPACK 5 LEADS       200 100 65 1000
LD39150PT18-R Datasheet icon link 6 1500 1.8V NotV PPACK 5 LEADS       200 100 65 1000
LD39150PT25-R Datasheet icon link 6 1500 2.5V NotV PPACK 5 LEADS       200 100 65 1000
LD39150PU-R* Datasheet icon link 6 1500 1.22V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable VFDFPN 6 3X3 0,95 PITCH       200 100 65 1000
LD39300DT12-R Datasheet icon link 6 3000 1.22V NotV TO-252 DPAK Cu Wire       200 100 65 1200
LD39300DT25-R Datasheet icon link 6 3000 2.5V NotV TO-252 DPAK Cu Wire       200 100 65 1200
LD39300DT33-R Datasheet icon link 6 3000 3.3Vv NotV TO-252 DPAK Cu Wire       200 100 65 1200
LD39300PT-R* Datasheet icon link 6 3000 1.22V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable PPACK 5 LEADS       200 100 65 1200
LD3980PU08R Datasheet icon link 3.6 300 0.8V NotV VFDFPN 6 3X3 0,95 PITCH     130 110 60 110
LD3980PU135R Datasheet icon link 3.6 300 1.35V NotV VFDFPN 6 3X3 0,95 PITCH     130 110 60 110
LD3980PU18R Datasheet icon link 3.6 300 1.8V NotV VFDFPN 6 3X3 0,95 PITCH     130 110 60 110
LD3985G33R Datasheet icon link 6 150 3.3Vv NotV TSOT23-5L   60 30 60 85
LD3985J18R Datasheet icon link 6 150 1.8V NotV CSPS0.5 4-6   60 30 60 85
LD3985J33R Datasheet icon link 6 150 3.3Vv NotV CSPS0.5 4-6   60 30 60 85
LD3985M122R Datasheet icon link 6 150 1.22V NotV SOT 23 5L   60 30 60 85
LD3985M18R Datasheet icon link 6 150 1.8V NotV SOT 23 5L   60 30 60 85
LD3985M25R Datasheet icon link 6 150 2.5V NotV SOT 23 5L   60 30 60 85
LD3985M27R Datasheet icon link 6 150 2.7V NotV SOT 23 5L   60 30 60 85
LD3985M28R Datasheet icon link 6 150 2.8V NotV SOT 23 5L   60 30 60 85
LD3985M29R Datasheet icon link 6 150 2.9V NotV SOT 23 5L   60 30 60 85
LD3985M30R Datasheet icon link 6 150 3Vo NotV SOT 23 5L   60 30 60 85
LD3985M33R Datasheet icon link 6 150 3.3Vv NotV SOT 23 5L   60 30 60 85
LD3985M47R Datasheet icon link 6 150 4.7V NotV SOT 23 5L   60 30 60 85
LD49150PT08R* Datasheet icon link 5.5 1500 0.8V 0.8V 1V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable PPACK 5 LEADS       200 65 68 6000
LD49150PT10R Datasheet icon link 5.5 1500 1V NotV PPACK 5 LEADS       200 65 68 6000
LD49150PT12R Datasheet icon link 5.5 1500 1.2V NotV PPACK 5 LEADS       200 65 68 6000
LD49300PT08R* Datasheet icon link 5.5 3000 0.8V 0.8V 1V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable PPACK 5 LEADS       400 65 68 6000
LD49300PT10R Datasheet icon link 5.5 3000 1V NotV PPACK 5 LEADS       400 65 68 6000
LD49300PT12R Datasheet icon link 5.5 3000 1.2V NotV PPACK 5 LEADS       400 65 68 6000
LD59015C33R Datasheet icon link 5.5 150 3.3Vv NotV SOT 323 5LDS   150 20 76 31
LDCL015M33R Datasheet icon link 5.5 150 3.3Vv NotV SOT 23 5L     50 40 52 120
LDCL015MR* Datasheet icon link 5.5 150 0.8Vv Variable SOT 23 5L     50 40 52 120
LDS3985M15R Datasheet icon link 6 300 1.5V NotV SOT 23 5L     150 30 55 85
LDS3985M18R Datasheet icon link 6 300 1.8V NotV SOT 23 5L     150 30 55 85
LDS3985M25R Datasheet icon link 6 300 2.5V NotV SOT 23 5L     150 30 55 85
LDS3985M28R Datasheet icon link 6 300 2.8V NotV SOT 23 5L     150 30 55 85
LDS3985M30R Datasheet icon link 6 300 3Vo NotV SOT 23 5L     150 30 55 85
LDS3985M33R Datasheet icon link 6 300 3.3Vv NotV SOT 23 5L     150 30 55 85
LDS3985M50R Datasheet icon link 6 300 5Vv NotV SOT 23 5L     150 30 55 85
LDS3985PU15R Datasheet icon link 6 300 1.5V NotV VFDFPN 6 3X3 0,95 PITCH     150 30 55 85
LDS3985PU28R Datasheet icon link 6 300 2.8V NotV VFDFPN 6 3X3 0,95 PITCH     150 30 55 85
LDS3985PU33R Datasheet icon link 6 300 3.3Vv NotV VFDFPN 6 3X3 0,95 PITCH     150 30 55 85
ST715M25R Datasheet icon link 24 85 2.5V NotV SOT 23 5L     500 95 62 3.8
ST715M33R Datasheet icon link 24 85 3.3Vv NotV SOT 23 5L     500 95 62 3.8
ST715MR* Datasheet icon link 24 85 1.2V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable SOT 23 5L     500 95 62 3.8
ST715PU25R Datasheet icon link 24 85 3.3Vv NotV VFDFPN 8 3x3x1.0 PITCH 0.65 SAWN     500 95 62 3.8
ST715PU33R Datasheet icon link 24 85 3.3Vv NotV VFDFPN 8 3x3x1.0 PITCH 0.65 SAWN     500 95 62 3.8
ST715PUR* Datasheet icon link 24 85 1.2V 1.2V 1.22V 1.35V 1.5V 1.8V 2.5V 2.7V 2.8V 2.9V 3Vo 3.1Vv 3.3Vv 4.7V v5V Variable VFDFPN 8 3x3x1.0 PITCH 0.65 SAWN     500 95 62 3.8
STLQ015XG25R Datasheet icon link 5.5 150 2.5Vv NotV SOT 666   112 75 40 1
STLQ015XG28R Datasheet icon link 5.5 150 2.8Vv NotV SOT 666   112 75 40 1
STLQ015XG30R Datasheet icon link 5.5 150 3Vv NotV SOT 666   112 75 40 1
STLQ015XG31R Datasheet icon link 5.5 150 3.1Vv NotV SOT 666   112 75 40 1
STLQ50C-R* Datasheet icon link 12 50 1.2Vv Variable SOT 323 5LDS     560 560 30 5
STLQ50C18R Datasheet icon link 12 50 1.8V NotV SOT 323 5LDS     400 560 30 5
STLQ50C25R Datasheet icon link 12 50 2.5V NotV SOT 323 5LDS     400 560 30 5
STLQ50C33R Datasheet icon link 12 50 3.3Vv NotV SOT 323 5LDS     400 560 30 5
STLQ50C50R Datasheet icon link 12 50 5Vv NotV SOT 323 5LDS     400 560 30 5

Part numbers with a "*" represent a product with an adjustable output voltage.

LDO Overview

These devices offer improved dropout, consumption and noise performances for several consumer, computing and industrial applications. They are available with an input voltage of up to 24V and maximum current up to 3A. Fixed and adjustable output voltage versions start from 0.8V and typical dropout voltage range is 0.05V to 0.5V.

They are available in the following packages (miniature to high power): CSP 08x08, CSP 1x1, DFN 3x3, SOT666, SC-70, TSOT23-5L, SOT23-5L, DPAK, PPAK.

Ultra-LDO

Ultra-LDO 

LDOs are a special subset of linear regulators. The drop out is the minimum voltage across the regulator (input – output differential) to maintain regulation. An LDO achieves low power dissipation by allowing a lower input voltage to be used for a given output voltage compared to what a standard linear regulator would need to maintain regulation.

Ultra-Low Drop-Out voltage regulators (ULDOs) achieve a typical dropout voltage below 200mV at full load.

Low Noise/High PSRR

Low Noise/High PSRR 

The Power Supply Rejection Ratio (or Supply Voltage Rejection, SVR) measures how well an LDO rejects the ripple coming from the input at various frequencies. The PSRR is expressed in dB and it is measured as the ratio between the ripple on the input voltage and the ripple on the output voltage. LD59015 and LD39115 series of high PSRR LDOs from STMicroelectronics are specifically designed to improve this critical parameter in noise sensitive, RF and battery powered wireless applications.

Unlike PSRR, the output noise in an LDO is generated internally within the circuitry of the voltage regulator. Measured as a function of frequency (in µV/sqrt[Hz]) or alternatively as output noise voltage (in µVRMS over a range of frequency), noise is a critical parameter in RF and wireless applications. An optimized low-noise LDO design, like STMicroelectronics LDLN015, delivers an impressive low 6.3µVRMS output noise voltage from 10Hz to 100KHz.

Low Quiescent Current

Low Quiescent Current 

The quiescent current of an LDO is the current drawn from the input pin to power the internal circuitry when the LDO is regulating. This is different from the shutdown current which is measured when the LDO is off. The quiescent current is usually negligeable at full load, because it is several orders of magnitude smaller than the output current. It becomes a critical parameter at quasi-zero or very light load, to prolong battery life in applications with long standby time. A common issue is the trade off between low quiescent current and dynamic performance (load transient response and PSRR). STMicroelectronics STLQ015 achieves a fast load transient despite the extremely low quiescent current (1µA).

Tiny Package

Tiny Package 

The ultra-small, high performance LDOs by STMicroelectronics are particularly suitable for the latest generation portable devices (tablets, smartphones, portable healthcare and fitness) where board space real estate is major constraint.

  • Chip-Scale-Package (Flip-Chip) 0.5 and 0.4mm pitch: 1x1mm, 0.8x0.8mm, 0.69x0.69mm
  • Dual-in-line Flat Non-leaded (DFN): 3x3mm, 2x2mm, 1.2x1.3mm
  • SOT666: 1.6x1.6mm