Monolithic Power Systems Inc. MPQ2019GN-5-P

Overview

MPQ2019GN-5-P from Monolithic Power Systems is a 40V-input, 5V-fixed-output linear regulator delivering up to 300mA with 10µA quiescent current, ±2% output accuracy over temperature, and AEC-Q100 Grade 1 qualification-designed for automotive body control modules, industrial sensors, and ultra-low-power microcontroller power rails.

For engineers reviewing the MPQ2019GN-5-P datasheet, MPQ2019GN-5-P pinout, MPQ2019GN-5-P application, or MPQ2019GN-5-P equivalent, this device supports high-voltage battery systems (3–40V), provides programmable power-good delay via external capacitor, integrates thermal shutdown and short-circuit protection, and operates across –40°C to +150°C junction temperature.

Technical Context

The MPQ2019GN-5-P implements a PMOS pass transistor architecture enabling low-dropout operation (480mV max at 300mA) and reverse-voltage blocking via internal body diode management. Its feedback loop regulates FB to 1.25V nominal, with internal resistor divider (3MΩ/1MΩ) setting fixed 5V output.

Power Good (PG) is an open-drain output with 5% hysteresis and programmable assertion delay (5–15ms via PGDL capacitor); EN pin enables logic-level on/off control (VIH = 1.8V, VIL = 0.3V), and GND connects to exposed thermal pad for enhanced thermal dissipation in SOIC-8 EP package.

Key Specifications

Pinout & Package

MPQ2019GN-5-P is housed in a SOIC-8 EP (exposed pad) package, with thermal pad soldered to PCB ground plane for θJA = 50°C/W and θJC = 10°C/W performance. Pin 3 (GND) and the exposed pad must share the same ground net for safe 2.5W power dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B6750QDGNRQ1 and NCP161ASN500T2G, MPQ2019GN-5-P uniquely combines AEC-Q100 Grade 1, programmable PG delay, and 40V input capability in a single SOIC-8 EP package-making it the only choice for primary battery-fed automotive and industrial regulators requiring precise power sequencing.

Availability

MPQ2019GN-5-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, ultra-low-power microcontroller systems, and portable medical devices requiring stable component supply under extended temperature and high-reliability conditions.

Supply support for MPQ2019GN-5-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 power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MPQ2019 product line targets automotive and industrial power management, delivering high-input-voltage linear regulators with ultra-low quiescent current, integrated protection, and AEC-Q100 qualification for harsh-environment applications.

FAQ

What is the minimum input voltage required for MPQ2019GN-5-P to regulate 5V output at 300mA?

The dropout voltage is 480mV maximum at 300mA and 25°C, so minimum input is 5.48V. At higher temperatures or lower loads, dropout decreases-e.g., 420mV at 150mA-allowing operation down to 5.42V. Below 5.48V, output drops linearly with input.

Can MPQ2019GN-5-P be used without connecting the PGDL pin?

Yes. PGDL is optional: leaving it floating disables programmable delay, causing PG to assert immediately upon VOUT reaching 92% of 5V. For fixed-delay timing, connect a capacitor (e.g., 47nF) between PGDL and GND; no pull-up or pull-down is needed.

How does the exposed pad in SOIC-8 EP affect thermal performance?

The exposed pad must be soldered to a dedicated PCB copper pour connected to GND. This reduces θJA from ~100°C/W (no pad connection) to 50°C/W, enabling 2.5W continuous dissipation at 25°C ambient-critical for automotive under-hood operation.

Is MPQ2019GN-5-P compatible with ceramic output capacitors smaller than 1µF?

Yes. The regulator is stable with ≥0.47µF X5R/X7R ceramic capacitors, verified per datasheet Figure 11. Smaller values reduce cost and footprint but may increase output ripple under transient load; 1µF remains recommended for optimal PSRR and load step response.

Does the FB pin require external components in the MPQ2019GN-5-P fixed-output version?

No. In MPQ2019GN-5-P, FB is internally connected to a 3MΩ/1MΩ resistor divider and must be left unconnected. Adding external resistors will alter output voltage and destabilize regulation; the pin has no function in fixed-output configuration.

What happens during input reverse voltage conditions (VOUT > VIN)?

The internal PMOS body diode conducts from OUT to IN, creating uncontrolled reverse current. To prevent damage, add an external Schottky diode (cathode to IN, anode to GND) or use a discrete reverse-protection MOSFET-per datasheet Section 13.

How is Power Good (PG) asserted and de-asserted?

PG is an open-drain output pulled high by external resistor (e.g., 100kΩ to VOUT). It asserts high when FB reaches 92–96% of 1.25V (i.e., 4.6–4.8V at VOUT), and de-asserts low when FB falls to 88–92% (4.4–4.6V), providing 5% hysteresis for noise immunity.