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

Overview

MPQ20051DQ-AEC1-LF-Z 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 and supports externally adjustable 0.8V–5V output voltage, targeting power rails in automotive infotainment and ADAS sensor modules.

For engineers reviewing the MPQ20051DQ-AEC1-LF-Z datasheet, MPQ20051DQ-AEC1-LF-Z pinout, MPQ20051DQ-AEC1-LF-Z application, or MPQ20051DQ-AEC1-LF-Z equivalent, key selection criteria include its automotive-grade thermal shutdown (150°C), ultra-low 130μA ground current at light load, stable ceramic-capacitor operation, and QFN-8 (3mm×3mm) package with exposed thermal pad tied to GND.

Technical Context

The MPQ20051 employs an internal PMOS pass transistor enabling low dropout and minimal ground current across load range. Its feedback loop uses a precision 0.8V reference with ±3% output voltage accuracy over −40°C to +125°C junction temperature.

Integrated protection includes thermal shutdown with 20°C hysteresis, short-circuit current limiting (1.2–2.3A), and UVLO with 1.95V turn-on threshold and 160mV hysteresis - all designed for robust operation in automotive power domains where supply transients and thermal cycling are routine.

Key Specifications

Pinout & Package

MPQ20051DQ-AEC1-LF-Z is housed in a thermally enhanced 3mm × 3mm QFN-8 package with exposed thermal pad on underside, requiring connection to PCB ground plane for optimal thermal performance (θ_JA = 50°C/W, θ_JC = 12°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, automotive-grade LDO applications.

Compared with TPS7B8133QDGNRQ1 and NCP1117ST33T3G, MPQ20051DQ-AEC1-LF-Z uniquely combines AEC-Q100 Grade 1 qualification, externally adjustable output (0.8V–5V), ultra-low 140mV dropout, and 63dB PSRR at 1kHz - making it the only choice for scalable, noise-critical automotive LDO applications requiring design reuse across multiple voltage rails and operating temperatures.

Availability

MPQ20051DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ20051DQ-AEC1-LF-Z 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 noise-sensitive, thermally constrained power domains in modern vehicles - including infotainment, ADAS, and body electronics - where low dropout, high PSRR, and AEC-Q100 reliability are mandatory.

FAQ

What is the minimum input voltage required for MPQ20051DQ-AEC1-LF-Z to regulate a 1.2V output?

The absolute minimum input is determined by dropout voltage plus output: 1.2V + 0.14V = 1.34V. However, the device specifies 2.5V minimum input per datasheet - due to internal UVLO (1.95V turn-on) and guaranteed operation across temperature. Below 2.5V, regulation is not assured even if dropout margin exists.

Can MPQ20051DQ-AEC1-LF-Z be used without the EN pin connected?

No - the EN pin must never be left floating. If shutdown control is unnecessary, tie EN directly to VIN. Floating EN causes undefined behavior and may result in erratic output enable/disable cycling due to noise coupling, risking system instability in automotive environments.

Why does the datasheet specify two separate VIN pins (pins 7 and 8), and must both be connected?

Pins 7 and 8 are electrically connected internally but provided as dual terminals to reduce package resistance and improve current handling. Both must be externally connected to the same input net with low-inductance traces and individual 2.2μF ceramic capacitors - ensuring balanced current distribution and minimizing voltage drop under 1A load.

Is the exposed thermal pad on the QFN-8 package required to be soldered to GND?

Yes - the exposed pad (pin 4) is the primary thermal and electrical ground path. It must be soldered to a dedicated PCB GND plane with ≥4 thermal vias (0.3mm diameter) connecting to inner-layer GND planes. Omitting this compromises thermal performance (θ_JA degrades >30%) and risks thermal shutdown during sustained 1A operation.

How does the MPQ20051 handle reverse voltage conditions where VOUT > VIN?

The internal PMOS pass element contains a parasitic body diode that conducts from VOUT to VIN if output is held high while input collapses - causing uncontrolled reverse current. The datasheet explicitly recommends adding an external Schottky diode in series with VIN to block reverse conduction and prevent device damage in backup-battery or hot-swap scenarios.

What is the maximum allowable output capacitor value for stable operation?

No upper limit is specified - the MPQ20051 is stable with ceramic capacitors from 2.2μF to ≥100μF. Larger values (e.g., 22μF–47μF) improve load-transient response and reduce output ripple, but increase inrush current at startup. Use X7R or X5R dielectrics rated ≥6.3V for reliability across temperature.