Monolithic Power Systems Inc. MP2019GN-33-P

Overview

MP2019GN-33-P from Monolithic Power Systems is a fixed-output 3.3V, 300mA low-dropout linear regulator with 3V–40V input range, 12µA typical quiescent current at light load, ±2% output voltage accuracy over temperature, and integrated power-good (PG) with programmable delay. It powers ultra-low-power microcontrollers in battery-backed industrial sensors and automotive body electronics where wide VIN and low standby current are critical.

For engineers reviewing the MP2019GN-33-P datasheet, MP2019GN-33-P pinout, MP2019GN-33-P application, or MP2019GN-33-P equivalent, this page delivers verified electrical specs, SOIC-8 EP package layout guidance, thermal shutdown behavior, PG timing control via PGDL capacitor, and real-world design constraints for high-voltage input regulation with tight output tolerance.

Technical Context

The MP2019GN-33-P uses a PMOS pass transistor architecture enabling 230mV typical dropout at 150mA and 480mV at 300mA (V_OUT = 3.3V), supporting operation down to 3.53V input under full load. Its internal 1.25V reference feeds a precision error amplifier that regulates FB to maintain V_OUT = 3.3V via factory-trimmed resistor divider (R1_IN = 1.64MΩ, R2_IN = 1MΩ).

Power-good functionality is implemented as an open-drain MOSFET with 88–96% V_FB rising/falling thresholds and hysteresis of 5% V_FB; PGDL pin accepts an external capacitor (e.g., 47nF) to set 5–15ms assertion delay, while PG reaction time remains ≤2µs for fast fault detection in safety-critical subsystems.

Key Specifications

Pinout & Package

MP2019GN-33-P is housed in a thermally enhanced SOIC-8 EP (Exposed Pad) package, with the exposed pad electrically connected to GND and requiring soldering to a dedicated ground plane for optimal thermal performance (θ_JA = 50°C/W, θ_JC = 10°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B6733QPWPRQ1 and ADM7172ACPZ-3.3-R7, MP2019GN-33-P uniquely balances ultra-low quiescent current (12µA), 40V input capability, and integrated programmable power-good timing - making it optimal for cost-sensitive, long-life industrial and automotive auxiliary rails where precise startup sequencing matters.

Availability

MP2019GN-33-P is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MP2019GN-33-P 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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP2019 series belongs to MPS's high-voltage, ultra-low-I_Q LDO product line, designed specifically for battery-powered and automotive systems needing reliable regulation from 3V to 40V inputs with minimal standby power loss.

FAQ

What is the minimum input voltage required to maintain 3.3V output at 300mA?

The maximum dropout voltage is 640mV at 300mA and 3.3V output. Therefore, the minimum input voltage is 3.3V + 0.64V = 3.94V. This ensures regulation remains active even under worst-case load and temperature conditions, as confirmed in the Electrical Characteristics table on page 4 of the datasheet.

Can the PG pin be left floating if not used?

Yes - the PG pin is an open-drain output and may be left unconnected if power-good monitoring is unnecessary. However, if used, it must be pulled up to V_OUT or another voltage ≤15V via a resistor (e.g., 100kΩ); connecting directly to V_CC without a pull-up resistor is not permitted per Absolute Maximum Ratings.

Is an external feed-forward capacitor required for stability?

No - the MP2019GN-33-P is stable with only a ≥0.47µF ceramic output capacitor. The 2.2nF feed-forward capacitor across the upper feedback resistor (R1) is optional and improves noise rejection for high-resolution ADCs, but adds no stability benefit and is omitted in standard implementations.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 165°C, the IC shuts down completely; it automatically resumes operation once the die cools by at least 30°C (hysteresis). During shutdown, quiescent current drops below 1µA, and PG goes low - providing both protection and a detectable fault signal for system-level diagnostics.

What is the purpose of the NC pin (Pin 2)?

Pin 2 is designated "No Connection" and must remain unconnected on the PCB. It is not internally bonded and has no electrical function; routing traces or placing vias to this pin violates the manufacturer's layout guidance and risks compromising SOIC-8 EP thermal performance or ESD robustness.

Does MP2019GN-33-P support reverse input-to-output voltage conditions?

No - the internal PMOS pass transistor includes a body diode that conducts from OUT to IN if V_OUT > V_IN. This can cause destructive reverse current during battery backup scenarios. An external Schottky diode in series with VIN is recommended to block reverse conduction, as specified in the Application Information section.

What is the recommended PCB layout for optimal thermal performance?

The exposed pad must be soldered to a large copper ground plane using ≥4 thermal vias (0.3mm diameter) spaced evenly beneath the pad. Input/output capacitors must be placed within 2mm of their respective pins, and feedback traces (though unused in fixed versions) must avoid noisy routing - following the EVB layout in Figure 5 of the datasheet is strongly advised.