Monolithic Power Systems Inc. MPQ20051DQ-LF-P

Overview

MPQ20051DQ-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, 130μA ground current, and 13μVRMS output noise (10Hz–100kHz). It operates from 2.5V–5.5V input and supports externally adjustable 0.8V–5V output voltage - ideal for automotive infotainment power rails and industrial sensor signal chains requiring stable, low-noise bias.

For engineers reviewing the MPQ20051DQ-LF-P datasheet, MPQ20051DQ-LF-P pinout, MPQ20051DQ-LF-P application, or MPQ20051DQ-LF-P equivalent, key selection criteria include its AEC-Q100 qualification, ceramic-capacitor stability, thermal shutdown threshold (150°C), and EN-controlled shutdown with 0.4V/1.5V logic thresholds.

Technical Context

The MPQ20051DQ-LF-P uses an internal PMOS pass transistor enabling ultra-low dropout and minimal ground current across load range. Its feedback loop references a precision 0.8V bandgap voltage, supporting accurate external resistor-divider programming of output voltage from 0.8V to 5V.

It integrates UVLO (1.95V rising threshold, 160mV hysteresis), overcurrent limiting (1.2–2.3A short-circuit limit), and thermal shutdown with 20°C hysteresis. PSRR reaches 63dB at 1kHz and remains >33dB up to 1MHz, making it suitable for noise-sensitive RF and ADC supply domains.

Key Specifications

Pinout & Package

MPQ20051DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-8 package with exposed thermal pad (connected to GND). The package supports JEDEC MO-229 VEEC-2 footprint and is rated MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, AEC-Q100 LDO applications.

Compared with TPS7B8133QDDARQ1 and ADM7150ACPZ-3.3-R7, MPQ20051DQ-LF-P uniquely combines AEC-Q100 Grade 1, adjustable output, and ceramic-capacitor compatibility - enabling single-part reuse across multiple voltage rails in automotive ECUs while maintaining thermal safety margins.

Availability

MPQ20051DQ-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and wireless communication equipment requiring stable component supply with full AEC-Q100 traceability and RoHS compliance.

Supply support for MPQ20051DQ-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 across Asia and North America and global manufacturing partnerships.

The MPQ20051 belongs to MPS's automotive-grade LDO product line, engineered specifically for noise-sensitive, thermally constrained applications in ADAS, body electronics, and infotainment systems where reliability and low EMI are critical.

FAQ

What is the minimum input voltage required for MPQ20051DQ-LF-P to regulate at 1.1V output?

The absolute minimum input is 2.5V per datasheet specifications. At 1.1V output, the 140mV dropout requirement means VIN must be ≥1.24V - but the device will not operate below 2.5V due to internal UVLO (1.95V rising threshold). Therefore, 2.5V is the functional minimum regardless of output voltage.

Can MPQ20051DQ-LF-P be used with aluminum polymer capacitors instead of ceramic?

No - the device is optimized and production-tested only with ceramic capacitors (X5R/X7R, 4.7μF typical). Aluminum polymer caps exhibit higher ESR and different frequency response, which may cause instability, overshoot, or failure to meet PSRR/noise specs. Ceramic is mandatory per design validation.

Is the exposed thermal pad electrically isolated or tied to GND internally?

The exposed pad is internally connected to the GND terminal (Pin 4). It must be soldered to a dedicated GND plane on the PCB to achieve specified θJA = 50°C/W and ensure thermal shutdown functions correctly. Leaving it unconnected raises junction temperature by >30°C under 1A load.

Does MPQ20051DQ-LF-P support reverse voltage protection on the output?

No - the internal PMOS pass element contains a body diode that conducts from OUT to IN if VOUT > VIN. This can cause destructive reverse current during backup battery scenarios. An external Schottky diode (cathode to VIN, anode to OUT) is required for reverse voltage protection per datasheet Application Information section.

How does the FB pin accuracy affect output voltage tolerance across temperature?

FB voltage is 0.8V ±2% over −40°C to +125°C. With standard 1% resistors, total output error is dominated by FB tolerance and resistor drift. For a 3.3V output, worst-case error is ±3% (−40°C to +125°C), matching the datasheet's guaranteed ±3% output accuracy specification under full temperature range.

What is the maximum allowable power dissipation at 85°C ambient with standard 4-layer PCB layout?

Using θJA = 50°C/W and TJ(MAX) = 125°C (recommended max operating junction), PD(MAX) = (125°C − 85°C)/50°C/W = 0.8W. At 1A load and 1.1V output, this limits usable input voltage to ≤2.1V (since P = I × (VIN − VOUT)). Higher VIN requires enhanced thermal layout (e.g., larger GND plane, thermal vias).

Is MPQ20051DQ-LF-P pin-compatible with earlier MPQ20051DQ-AEC1 variants?

Yes - both share identical QFN-8 (3mm×3mm) package, pinout, and electrical behavior. The "-LF-P" suffix denotes RoHS-compliant, lead-free, and halogen-free packaging with tape-and-reel delivery; functionally interchangeable in existing designs with no layout changes required.