Fixed and Adjustable LDO Regulators

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.

LDO Product Table
Overview and More Information

Low Drop Out Regulators (LDO)

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

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

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 µV_RMS 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 6.3µV_RMS output noise voltage from 10Hz to 100KHz.

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

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