Monolithic Power Systems Inc. MP2019GN

Overview

MP2019GN 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 with programmable delay. It serves as a primary voltage regulation stage for high-voltage battery systems in ultra-low-power microcontroller applications.

For engineers reviewing the MP2019GN datasheet, MP2019GN pinout, MP2019GN application, or MP2019GN equivalent, this device supports critical low-quiescent-current design requirements in automotive sensor nodes, portable medical devices, and industrial IoT edge sensors where input voltage can reach 40V and standby current must remain below 15µA.

Technical Context

The MP2019GN implements a PMOS pass transistor architecture enabling low dropout (420mV at 300mA/5V) and reverse-voltage protection awareness via external diode recommendation. Its feedback loop regulates FB to 1.25V with 50nA input bias, supporting resistor-divider-based output programming.

Power-good functionality uses an open-drain PG pin with 89–97% VFB rising threshold and hysteresis, while PGDL enables precise delay tuning (5–15ms with 47nF) via internal 3–9µA charging current - both features directly support system-level power sequencing and brown-out detection.

Key Specifications

Pinout & Package

MP2019GN is housed in an SOIC-8 EP (exposed pad) package optimized for thermal performance in high-input-voltage linear regulation. The exposed pad must be soldered to a dedicated ground plane for effective junction-to-ambient heat transfer (θJA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP38691SD-ADJ and ADM7172ACPZ-R7, MP2019GN uniquely balances ultra-low quiescent current (10µA), 40V input capability, and 300mA output in a thermally enhanced SOIC-8 EP - making it optimal for battery-backed industrial and automotive edge nodes where input voltage range and standby efficiency are non-negotiable.

Availability

MP2019GN is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical monitors, industrial PLC I/O modules, and smart meter communication units requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP2019GN 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, and global manufacturing partnerships.

The MP2019GN belongs to MPS's low-quiescent-current linear regulator product line, engineered specifically for battery-powered and high-input-voltage industrial systems where efficiency at light load and robustness under voltage transients are critical.

FAQ

What is the minimum input voltage required for MP2019GN to regulate a 3.3V output?

The MP2019GN requires a minimum input voltage equal to its output voltage plus dropout voltage. At 300mA load and 3.3V output, the typical dropout is 480mV, so minimum input is 3.78V. The absolute minimum specified input is 3V, but regulation cannot be guaranteed below VOUT + VDROPOUT.

Can MP2019GN be used without the PGDL capacitor?

Yes - the PGDL pin may be left floating if programmable power-good delay is not needed. In that case, the PG signal asserts immediately upon VFB reaching 93% of nominal value, with no intentional delay. Leaving PGDL unconnected does not affect regulation or protection functions.

How is output voltage set for the MP2019GN adjustable version?

Output voltage is set using a resistor divider between OUT and GND, with the midpoint connected to FB. With FB regulated to 1.25V, VOUT = 1.25V × (1 + R1/R2). For stability and bias current, R2 is typically selected as 1MΩ, then R1 is calculated accordingly.

Does MP2019GN require an input capacitor, and what value is recommended?

Yes - a 1µF to 10µF X5R or X7R ceramic capacitor is required between VIN and GND. A 1µF capacitor is sufficient for basic stability; larger values (e.g., 4.7µF) improve line transient response and reduce input ripple coupling into the output.

What thermal derating applies to MP2019GN at 85°C ambient temperature?

At TA = 85°C, maximum continuous power dissipation is PD(MAX) = (150°C − 85°C) / 50°C/W = 1.3W. With 5V output and 300mA load, power dissipated is (VIN − 5V) × 0.3A. To stay within 1.3W, VIN must be ≤ 9.33V at full load - higher input voltages require reduced load current or improved PCB copper area.

Is MP2019GN compatible with ceramic output capacitors smaller than 1µF?

No - the datasheet specifies stability with ≥0.47µF ceramic capacitors, and recommends 1µF–22µF for optimal transient response. Capacitors below 0.47µF risk oscillation or poor load regulation; 0.47µF is the verified minimum for phase margin compliance.

How does the EN pin behave during power-up, and what is its leakage current?

The EN pin has 0.1–0.5µA leakage across 0–15V. It asserts high (≥1.8V) to enable regulation and pulls low (≤0.3V) to enter shutdown (<1µA supply current). Connecting EN directly to VIN provides automatic startup; tying to MCU GPIO enables controlled sequencing with precise timing margins.