Monolithic Power Systems Inc. EVQ20051-Q-00A

Overview

EVQ20051-Q-00A from Monolithic Power Systems is an evaluation board for the MPQ20051 low-noise, high-PSRR 1A linear regulator IC. It supports input voltage from 2.5V to 5.5V, delivers up to 1A load current at adjustable output (0.8V–5V), features 140mV dropout at 1A, 13μVRMS output noise, and 63dB PSRR at 1kHz - optimized for powering noise-sensitive analog rails in portable electronics.

For engineers reviewing the EVQ20051-Q-00A datasheet, EVQ20051-Q-00A pinout, EVQ20051-Q-00A application, or EVQ20051-Q-00A equivalent, this board enables rapid validation of MPQ20051 performance under real-world line/load transients, thermal stress, and PSRR/noise requirements in battery-powered systems.

Technical Context

The EVQ20051-Q-00A implements the MPQ20051DQ QFN-8 IC with internal PMOS pass device, enabling ultra-low 110μA ground current and fast transient response. Its feedback loop uses a precision 0.8V reference (V_FB) and external resistor divider (R1/R2) to set output voltage from 0.8V to 5V.

Board-level design includes input/output ceramic capacitors (C1=2.2μF, C2=4.7μF, C3=560pF), EN pull-up resistor (R3=100kΩ), and test points for VIN, VOUT, GND, and EN - supporting both fixed (default 1.1V) and adjustable configurations per MPS application guidance.

Key Specifications

Availability

EVQ20051-Q-00A is available at Aetrix Electronics and suitable for notebook computers, cellular phones, and hand-held instruments requiring stable component supply, fast design iteration, and verified low-noise power delivery.

Supply support for EVQ20051-Q-00A 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 emphasis on efficiency, integration, and reliability in power management solutions.

The MPQ20051 product line targets battery-powered portable electronics needing ultra-low noise, high PSRR, and minimal quiescent current - delivering clean power to sensitive analog and mixed-signal subsystems.

FAQ

What is the default output voltage of the EVQ20051-Q-00A board?

The board is configured by default for 1.1V output using R1 = 3.74kΩ and R2 = 10kΩ, based on the MPQ20051's 0.8V feedback reference. This setting meets common core-voltage requirements for low-power microcontrollers and RF ICs.

How do I adjust the output voltage on this evaluation board?

Replace R1 with a new value calculated using V_OUT = V_FB × (1 + R1/R2), where V_FB = 0.8V and R2 = 10kΩ. The board accommodates standard 0603 resistors, and layout supports quick rework without solder mask removal.

Does the board include enable and thermal protection functionality?

Yes - the EN pin accepts 1.5V–5.5V to activate the regulator and <0.4V to disable it. Thermal shutdown and current limiting are implemented by the MPQ20051DQ IC itself and fully exercised on this board under full 1A load conditions.

What decoupling capacitors are used, and why?

C1 (2.2μF) and C2 (4.7μF) provide bulk and high-frequency input/output filtering; C3 (560pF NP0) stabilizes the feedback loop. All are X5R/NP0 0603 ceramics - selected for low ESR, stable capacitance over voltage/temperature, and optimal transient response.

Can this board be used for long-term operation in a final product?

No - it is an evaluation board intended for lab validation and design-in support only. For production, use the MPQ20051DQ IC in a custom PCB layout optimized for thermal dissipation, noise isolation, and EMI compliance per the datasheet layout guidelines.

Is the MPQ20051DQ RoHS-compliant and lead-free?

Yes - all MPS parts, including MPQ20051DQ on this board, are lead-free and comply with the RoHS directive. Green status documentation is available on the MPS Quality Assurance webpage.