Monolithic Power Systems Inc. MP2019GN-Z

Overview

MP2019GN-Z from Monolithic Power Systems is a 40V-input, 300mA adjustable-output linear regulator with 10µA quiescent current, 1.25V–15V output range, ±2% output accuracy over temperature, and integrated power-good signaling. It operates in industrial and automotive systems powered by high-voltage batteries (e.g., 24V truck rails or 36V Li-ion packs), delivering stable low-power bias to ultra-low-power microcontrollers and sensor nodes.

For engineers reviewing the MP2019GN-Z datasheet, MP2019GN-Z pinout, MP2019GN-Z application, or MP2019GN-Z equivalent, key selection criteria include its 40V max input rating, SOIC-8 EP thermal performance (θJA = 50°C/W), programmable PG delay via external capacitor, FB reference voltage of 1.25V, and compatibility with ≥0.47µF ceramic output capacitors.

Technical Context

The MP2019GN-Z implements a PMOS-based LDO architecture with internal current limiting (~1A peak), thermal shutdown at 165°C (30°C hysteresis), and undervoltage lockout on EN. Its feedback loop regulates the FB pin to 1.25V, enabling precise output adjustment via external resistor divider.

Power-good functionality uses an open-drain PG pin with 89–97% VFB rising threshold and user-programmable assertion delay (5–15ms with 47nF on PGDL). The IC supports automatic startup when EN is tied to VIN and achieves <1µA shutdown current when EN < 0.3V.

Key Specifications

Pinout & Package

MP2019GN-Z is housed in a thermally enhanced SOIC-8 EP package with exposed pad soldered to PCB ground plane for optimal thermal dissipation (θJC = 10°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable-output LDO applications.

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, MP2019GN-Z uniquely combines 40V input tolerance, 10µA IQ, and programmable PG delay in a single SOIC-8 EP package - making it optimal for long-life, high-voltage industrial and automotive LDO applications where timing coordination and thermal robustness are essential.

Availability

MP2019GN-Z is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, portable medical monitors, and smart meter data loggers requiring stable component supply with guaranteed long-term availability.

Supply support for MP2019GN-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan.

The MP2019 product line targets high-input-voltage, ultra-low-power linear regulation for battery-backed and automotive systems - emphasizing thermal resilience, extended temperature operation, and integrated system-level features like programmable power-good timing.

FAQ

What is the minimum output capacitor value required for MP2019GN-Z stability?

The MP2019GN-Z is stable with a minimum 0.47µF X5R or X7R ceramic capacitor on the output. This low-value requirement reduces cost and board area versus traditional LDOs needing ≥10µF tantalum or aluminum electrolytic capacitors. Larger values (up to 22µF) improve load transient response but are not required for basic stability.

How does the PGDL pin affect power-good timing behavior?

The PGDL pin charges with a factory-trimmed 3–9µA current to set the delay before PG asserts high. Using a 47nF capacitor yields a typical 10ms delay. This programmable feature allows synchronization with downstream device reset timing - for example, delaying PG assertion until an FPGA completes configuration - avoiding race conditions in complex power sequences.

Can MP2019GN-Z operate with input voltage below 3V?

No. The MP2019GN-Z has a hard 3V minimum input voltage due to internal UVLO circuitry. Below 3V, the regulator disables and draws <1µA. This prevents unstable operation near dropout and ensures predictable startup behavior when used with batteries discharging into termination voltage.

What is the purpose of the NC pin (Pin 2) in the SOIC-8 EP package?

Pin 2 is a true no-connect terminal - it has no internal bond wire or silicon connection. It must remain unconnected on the PCB. Routing traces or placing vias to this pin may cause unintended coupling or mechanical stress; best practice is to leave it floating and exclude from copper pours.

How does thermal performance differ between MP2019GN-Z and standard SOIC-8 packages?

The MP2019GN-Z uses a SOIC-8 EP (exposed pad) variant with θJA = 50°C/W and θJC = 10°C/W - significantly better than standard SOIC-8 (θJA ≈ 120°C/W). The exposed pad must be soldered to a large copper ground plane to achieve rated thermal resistance; failure to do so risks premature thermal shutdown at >1.2W dissipation.

Is reverse voltage protection required when using MP2019GN-Z?

Yes - the internal PMOS pass transistor includes a body diode that conducts from OUT to IN if VOUT > VIN. In backup-battery or hot-swap scenarios, this can cause uncontrolled reverse current and potential damage. An external Schottky diode (anode to IN, cathode to VIN) is recommended to block reverse conduction while adding minimal forward drop.

What is the FB pin's voltage reference accuracy and temperature drift?

The FB pin is regulated to 1.25V with ±2.5% initial accuracy (1.225V–1.275V) and maintains ±2% total output accuracy over –40°C to +125°C junction temperature. This tight reference enables precise output setting across automotive and industrial environments without external trimming.