Monolithic Power Systems Inc. MPQ20051DQ-AEC1-LF-P

Overview

MPQ20051DQ-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified low-noise, high-PSRR linear regulator delivering up to 1A output current with 140mV dropout at full load, 13μV_RMS output noise (10Hz–100kHz), and 63dB PSRR at 1kHz. It operates from 2.5V–5.5V input, supports adjustable 0.8V–5V output via external resistor divider, and features 130μA ground current for battery-sensitive automotive power rails.

For engineers reviewing the MPQ20051DQ-AEC1-LF-P datasheet, MPQ20051DQ-AEC1-LF-P pinout, MPQ20051DQ-AEC1-LF-P application, or MPQ20051DQ-AEC1-LF-P equivalent, this device is selected for precision low-voltage rail generation in safety-critical automotive ECUs where low thermal overhead, ESD robustness (2kV HBM), and stable ceramic-capacitor operation are mandatory.

Technical Context

The MPQ20051DQ-AEC1-LF-P uses an internal PMOS pass element enabling ultra-low dropout and minimal ground current across temperature. Its feedback architecture references a precise 0.8V bandgap voltage, supporting externally adjustable output with ±3% accuracy over −40°C to +125°C junction range.

Integrated protection includes thermal shutdown at 150°C (20°C hysteresis), short-circuit current limiting (1.2–2.3A), and UVLO with 1.95V turn-on threshold and 160mV hysteresis-ensuring reliable startup and fault recovery in automotive 12V-derived systems.

Key Specifications

Pinout & Package

MPQ20051DQ-AEC1-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-8 package with exposed thermal pad. The pad must be soldered to a PCB ground plane to achieve θ_JA = 50°C/W and sustain full 1A load at 125°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise linear regulator applications.

Compared with TPS7A83AQPWRQ1 and NCP1117ST50T3G, MPQ20051DQ-AEC1-LF-P uniquely balances automotive-grade reliability, sub-150mV dropout, and 63dB PSRR above 1kHz-making it optimal for next-gen ADAS and connected vehicle power domains where thermal, noise, and qualification constraints coexist.

Availability

MPQ20051DQ-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive body control modules, infotainment system core rails, ADAS camera power supplies, and telematics cellular modem rails requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ20051DQ-AEC1-LF-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 in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ20051 belongs to MPS's automotive-qualified linear regulator product line, engineered specifically for low-noise, high-PSRR power delivery in safety-critical vehicle subsystems including ADAS, body electronics, and infotainment.

FAQ

What is the minimum input voltage required for regulation at 3.3V output?

The MPQ20051DQ-AEC1-LF-P requires VIN ≥ VOUT + dropout voltage. At 3.3V output and 1A load, dropout is 140mV, so minimum input is 3.44V. With 2.5V input capability, it supports 0.8V–2.36V outputs under worst-case dropout conditions.

Can the EN pin be left unconnected if shutdown is not needed?

No-EN must never be floated. Tie EN directly to VIN for permanent enable. Floating EN risks erratic behavior due to noise coupling, especially in automotive EMI environments. Internal pull-down is insufficient for robust operation.

Is the exposed thermal pad electrically isolated from other pins?

No-the exposed pad is internally connected to GND and must be soldered to the PCB ground plane. It serves as both primary thermal path and electrical ground return; isolation would cause thermal runaway and violate AEC-Q100 thermal test requirements.

Does the MPQ20051DQ-AEC1-LF-P support reverse voltage protection?

No-its internal PMOS body diode conducts from VOUT to VIN during reverse bias. External Schottky diode on VIN is mandatory if backup battery or hot-swap scenarios could raise VOUT above VIN, per datasheet Section 12.

How does the 0.8V feedback reference affect output accuracy at 1.2V setting?

At 1.2V output, the resistor divider scales the 0.8V reference. Total accuracy includes FB voltage tolerance (±2% at 25°C, ±3% over temp), resistor tolerance, and layout-induced errors. Typical total error is ±3.5%, verified by the 1.2V design example using 3.75kΩ/10kΩ resistors.

What is the maximum allowable power dissipation at 85°C ambient?

Using θ_JA = 50°C/W and TJ_MAX = 125°C (recommended max), PD_MAX = (125°C − 85°C)/50°C/W = 0.8W. This corresponds to ~1.6A at 0.5V dropout or 1A at 0.8V dropout-confirming full 1A operation is viable with proper PCB copper area.