Monolithic Power Systems Inc. EV20045DN-00A

Overview

EV20045DN-00A from Monolithic Power Systems is an evaluation board for the MP20045DN low-noise, 1A adjustable-output LDO regulator. It supports 3.5–5.5V input, delivers up to 1A at user-configurable output (default 3.0V), and integrates power-good signaling, thermal shutdown, and current limiting - optimized for battery-powered portable electronics.

For engineers reviewing the EV20045DN-00A datasheet, EV20045DN-00A pinout, EV20045DN-00A application, or EV20045DN-00A equivalent, this board enables rapid validation of MP20045DN's low-noise (13μVRMS), high-PSRR (56dB @ 1kHz), fast-transient, and low-dropout (140mV @ 1A) performance in real-world load conditions.

Technical Context

The EV20045DN-00A implements the MP20045DN SOIC-8E LDO in an adjustable configuration using external R1/R2 feedback network (R1 = 10kΩ, R2 = 10kΩ default for 3.0V). It includes input (10μF X7R 1210) and output (2.2μF X7R 0805) ceramic capacitors, EN control with 100kΩ pull-up, and open-drain PG signal routed to a test point.

Board layout follows MPS reference design guidelines: compact 2.5" × 2.5" footprint, top-layer power routing, bottom-layer ground plane, and silk-screened test points for VIN, VOUT, GND, EN, FB, and PG - supporting both bench testing and integration into host systems requiring stable low-noise bias rails.

Key Specifications

Availability

EV20045DN-00A is available at Aetrix Electronics and suitable for notebook computers, cellular phones, and hand-held instruments requiring stable component supply, low-noise power rail validation, and rapid LDO prototyping cycles.

Supply support for EV20045DN-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, headquartered in California and serving global power management markets since 1997.

The EV20045DN-00A belongs to MPS's evaluation board portfolio for linear regulators, designed specifically to accelerate design-in of their low-noise, high-PSRR LDOs in portable and battery-sensitive applications.

FAQ

What is the default output voltage, and how is it configured?

The default output voltage is 3.0V, set by a 10kΩ/10kΩ resistor divider (R1/R2) on the FB pin per the formula VOUT = VFB × (1 + R2/R1), where VFB = 1.5V. This configuration is verified in the schematic and bill of materials on page 3 of the reference document.

Can this board be used with fixed-output versions of the MP20045?

Yes - the board can be modified for fixed-output MP20045 variants by removing U1, replacing it with the target fixed-voltage part (e.g., MP20045DG-LF-Z), removing R1/R2, and shorting R1's pads. This procedure is explicitly documented in the "Modification for Fixed Output" section on page 5.

What are the required input and output capacitors, and why are they specified?

The board uses a 10μF/16V X7R ceramic capacitor (CIN, 1210) at the input and a 2.2μF/16V X7R ceramic capacitor (COUT, 0805) at the output. These values and types meet MP20045DN stability requirements per its datasheet, ensuring phase margin >45° and minimizing output ripple under transient loads.

How is the power-good (PG) signal implemented, and what external components does it need?

The PG signal is an open-drain output tied to the MP20045DN's PG pin. It requires an external pull-up resistor (typically 10kΩ to VIN) to generate a logic-high signal when regulation is valid. The board provides a test point but no onboard pull-up, enabling flexible interfacing with microcontrollers or PMICs.

Does the board support thermal testing, and how is thermal performance validated?

Yes - the SOIC-8E footprint and copper pour design allow direct thermal measurement of the MP20045DN under 1A load. The board's 2.5" × 2.5" size and bottom-layer ground plane provide repeatable thermal impedance, consistent with MPS's published junction-to-ambient θJA of 120°C/W for this package in standard layouts.