power management pmic

SPX3819

Full part number: SPX3819M5-L

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the SPX3819 does

The SPX3819 is a 500mA low-noise LDO voltage regulator offering fixed or adjustable outputs from 1.2V to 5.0V. It features a 340mV dropout at full load, 800µA ground current at 100mA output, and 40µV RMS output noise. The device includes reverse battery protection, current limit, and thermal shutdown. It serves portable consumer equipment, instrumentation, and industrial applications requiring low power consumption. Available in 5-pin SOT-23, 8-pin SOIC, and 8-pin DFN packages, it supports both fixed and adjustable voltage configurations for battery-powered systems.

Next step

Start building with SPX3819 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

01 — Key specifications

Datasheet parameters

Datasheet parameters for SPX3819
Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	50 nA	3 µA	VENABLE≤ 0.4V; (ignd); OPERATING RATINGS	Exar datasheet, p. 2 — OPERATING RATINGS
output current	—	500 mA	—		Exar datasheet, p. 2
operating temperature	-40 °C	—	125 °C	junction temperature range	Exar datasheet, p. 2
psrr	—	70 dB	—	ripple(psrr); OPERATING RATINGS	Exar datasheet, p. 2 — OPERATING RATINGS
output noise voltage	—	300 µV	—	IL = 10mA, CL = 1.0μF, CIN = 1μF, (10Hz – 100kHz); (eno); 500mA Low-Noise LDO Voltage Regulator	Exar datasheet, p. 3 — 500mA Low-Noise LDO Voltage Regulator
output count	—	1	—		Exar datasheet, p. 2

02 — Alternatives

Closest matches to SPX3819

AZ1117-5.0 2.0× higher output current, 2.0× lower output noise voltage, 1.1× higher psrr

AP2112 10.6× higher supply voltage range, 6.0× lower output noise voltage, 1.9× lower operating temperature

AP2127-1.0 10.6× higher supply voltage range, 5.0× lower output noise voltage, 1.9× lower operating temperature

AP2127-3.3 10.6× higher supply voltage range, 5.0× lower output noise voltage, 1.9× lower operating temperature

L78M05ABDT 7.5× lower output noise voltage, 1.1× lower psrr, similar operating temperature

L78M05ABV 7.5× lower output noise voltage, 1.1× lower psrr, similar operating temperature

LD1117-3.3 3.0× lower output noise voltage, 1.6× higher output current, 1.2× higher operating temperature

TLV757P 8.7× higher supply voltage range, 3.1× higher output current, 2.0× lower output noise voltage

03 — FAQ

Frequently asked questions

What is the operating temperature for the SPX3819M5-L?

The operating temperature is 125 °C at the junction temperature range.

What is the output count of the SPX3819M5-L?

The output count is 1.

What is the output current of the SPX3819M5-L?

The output current is 500 mA.

What is the output noise voltage of the SPX3819M5-L?

The output noise voltage is 300 µV when IL = 10mA, CL = 1.0μF, CIN = 1μF, and the frequency range is 10Hz – 100kHz.

What is the Power Supply Rejection Ratio (PSRR) under operating ratings?

The PSRR is 70 dB.

What is the quiescent current when VENABLE≤ 0.4V?

The quiescent current is 50 nA.

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