Monolithic Power Systems Inc. MPQ2019GN

Overview

MPQ2019GN from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified adjustable-output linear regulator delivering up to 300mA output current with 10µA quiescent supply current, 3V–40V input range, and 1.25V–15V programmable output voltage. It integrates thermal shutdown, current limiting, power-good monitoring with programmable delay, and operates across –40°C to +150°C junction temperature-designed for automotive body control modules requiring ultra-low standby power.

For engineers reviewing the MPQ2019GN datasheet, MPQ2019GN pinout, MPQ2019GN application, or MPQ2019GN equivalent, this page delivers verified technical context, SOIC-8 EP package mapping, real-world use cases in automotive ECUs and battery-powered medical sensors, and validated alternative parts with documented functional trade-offs.

Technical Context

The MPQ2019GN uses a PMOS pass transistor architecture enabling low-dropout operation (420mV at 300mA/5V) and reverse-voltage blocking via its intrinsic body diode-though external protection is recommended when V_OUT > V_IN. Its feedback loop regulates FB to 1.25V ±2.5% over temperature, supporting precise output setting via external resistor dividers.

Power-good functionality is implemented as an open-drain PG pin with 5% hysteresis and user-programmable assertion delay (5–15ms via 47nF on PGDL), synchronized to FB reaching 93% of target. Thermal shutdown activates at 165°C with 30°C hysteresis, ensuring self-recovery after cooling without latch-up.

Key Specifications

Pinout & Package

MPQ2019GN is housed in a thermally enhanced SOIC-8 EP (exposed pad) package, with the exposed pad electrically connected to GND and required to be soldered to a PCB ground plane for thermal dissipation (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 adjustable-output LDO applications.

Compared with MPQ2019GN, TPS7B8750QKVURQ1 adds ASIL-B capability at the cost of adjustability and higher quiescent current, while NCP163AMX330TBG achieves lower I_Q but sacrifices programmability, current capacity, and automotive-grade fault signaling-making MPQ2019GN the balanced choice for AEC-Q100 systems needing flexibility and robustness.

Availability

MPQ2019GN is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and portable medical sensor nodes requiring stable component supply with AEC-Q100 qualification and long-term lifecycle assurance.

Supply support for MPQ2019GN 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 MPQ2019GN belongs to MPS's automotive-grade linear regulator product line, engineered specifically for harsh-environment applications demanding wide-input voltage tolerance, ultra-low quiescent current, and AEC-Q100 reliability-targeting body electronics, ADAS subsystems, and telematics.

FAQ

What is the minimum output capacitor required for stability?

The MPQ2019GN is stable with a minimum 0.47µF X5R/X7R ceramic capacitor on the output. Larger values (up to 22µF) improve load transient response and reduce output noise, but are not required for basic stability. Avoid high-ESR capacitors like standard aluminum electrolytics, as they may cause oscillation.

Can the MPQ2019GN be used with input voltages below 3V?

No-the absolute minimum input voltage is 3V per the datasheet's Recommended Operating Conditions. Below this, the internal bandgap reference and error amplifier cannot maintain regulation, and the device may enter undefined behavior or fail to start. UVLO prevents operation below ~2.7V to ensure clean startup.

How is the power-good delay time calculated?

PG delay is set by a capacitor on PGDL: t_PGDL(ms) = C_PGDL(nF) × 1.7V / I_PGDL(µA). With I_PGDL = 5.5µA typical, a 47nF capacitor yields ~10ms delay. The PGDL pin charges linearly until reaching 1.7V, at which point the PG signal asserts high-enabling precise timing alignment with system boot windows.

Is external reverse-voltage protection mandatory?

Yes-if the output voltage can exceed the input (e.g., during backup battery hold-up), the internal PMOS body diode conducts uncontrolled reverse current. Since the device lacks reverse-current blocking, an external Schottky diode (anode to IN, cathode to VIN) is required to prevent damage and excessive power dissipation in the pass element.

What is the thermal performance impact of omitting the exposed pad connection?

Omitting the exposed pad connection to the PCB ground plane increases θ_JA from 50°C/W to >100°C/W, reducing maximum continuous power dissipation by >50%. At 300mA and 5V dropout, junction temperature would exceed 165°C within seconds-triggering thermal shutdown and causing intermittent operation or permanent damage.

Does the MPQ2019GN support remote sensing?

No-it does not include dedicated sense pins. Output voltage regulation is based solely on the FB pin voltage, which must be connected directly to the output node or through a resistor divider. For applications requiring compensation of PCB trace IR drop, a Kelvin connection to the load is not supported; external compensation networks are not specified in the datasheet.

What is the maximum allowable output capacitance?

No maximum is specified-the device remains stable with output capacitors up to at least 100µF, as confirmed by bench testing in the datasheet's Typical Performance Characteristics. However, larger values (>22µF) increase startup time and may affect PG assertion timing; 22µF is recommended for optimal transient response and PG delay predictability.