Monolithic Power Systems Inc. EV20045DQ-00A

Overview

EV20045DQ-00A from Monolithic Power Systems is an evaluation board for the MP20045DQ low-noise, high-PSRR 1A linear regulator. It supports adjustable output (1.5V–5V) from 2.5V–5.5V input, delivers up to 1A load current, features open-drain power-good status, thermal shutdown, and current limiting, and is optimized for battery-powered instrumentation and portable communications devices.

For engineers reviewing the EV20045DQ-00A datasheet, EV20045DQ-00A pinout, EV20045DQ-00A application, or EV20045DQ-00A equivalent, this board enables rapid validation of MP20045DQ performance-including 13μVRMS noise, 56dB PSRR at 1kHz, 140mV dropout at 1A, and fast transient response-in real-world LDO design scenarios.

Technical Context

The EV20045DQ-00A implements the MP20045DQ in a QFN-8 (3mm × 3mm) package with external resistor-based feedback for output voltage adjustment. It uses an internal PMOS pass element enabling ultra-low 110μA ground current and 140mV dropout at full 1A load.

Board-level design includes dual 2.2μF X7R ceramic input/output capacitors (0805), 100pF COG bypass capacitor (0603), precision 1% feedback resistors (R1/R2 = 10kΩ), and EN control with 100kΩ pull-up for automatic startup-fully supporting quick-start evaluation of both adjustable and fixed-output configurations.

Key Specifications

Availability

EV20045DQ-00A is available at Aetrix Electronics and suitable for notebook computers, cellular phones, and handheld instrumentation requiring stable component supply, rapid prototyping capability, and validated LDO performance data under real load conditions.

Supply support for EV20045DQ-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 expertise in DC/DC converters, LDOs, motor drivers, and LED drivers since 1997.

The MP20045 product line targets ultra-low-noise, high-PSRR linear regulation for sensitive analog and RF subsystems in portable and battery-powered applications-emphasizing low quiescent current, fast transient response, and robust protection features.

FAQ

What is the default output voltage setting on the EV20045DQ-00A?

The default output voltage is 3.0 V, achieved using R1 = R2 = 10 kΩ with the MP20045DQ's 1.5 V feedback reference. This configuration is confirmed in the Quick Start Guide and Bill of Materials, and can be recalculated using VOUT = VFB × (1 + R2/R1).

Can the EV20045DQ-00A be used with fixed-output versions of the MP20045?

Yes-the board supports fixed-output variants via hardware modification: remove U1, replace with fixed-output MP20045 (e.g., MP20045DG-LF-Z), remove R1 and R2, and short R1's pads. This procedure is explicitly documented in the "Modification for Fixed Output" section of the user guide.

What is the role of the EN pin on the EV20045DQ-00A board?

The EN pin controls regulator enable/disable: applying 1.5–5.5 V enables the MP20045DQ; applying <0.4 V disables it. A 100 kΩ pull-up to VIN provides automatic startup, as specified in the Quick Start Guide and validated in the schematic.

Which capacitors are used for input and output filtering on this evaluation board?

The board uses two 2.2 μF X7R ceramic capacitors (TDK C2012X7R1C225K, 0805 package) for input (C1) and output (C2), plus a 100 pF COG capacitor (TDK C1608COG1H101J, 0603) for high-frequency bypass-matching MP20045DQ's stability and noise requirements.

Does the EV20045DQ-00A provide power-good indication?

Yes-it exposes the MP20045DQ's open-drain power-good (PG) signal on a dedicated test point. PG asserts high when VOUT is within ±5% of target and remains asserted only while EN is high and thermal/current limits are not exceeded.

What is the maximum ambient temperature rating for continuous 1A operation on this board?

The board itself has no standalone rating; its thermal performance follows the MP20045DQ QFN-8 package limits. With standard 2-layer PCB layout and copper pour, continuous 1A operation is supported up to +85°C ambient, assuming proper airflow and adherence to the thermal layout guidelines in the MP20045 datasheet.