Monolithic Power Systems Inc. EVQ5071-G-00A

Overview

EVQ5071-G-00A from Monolithic Power Systems is an evaluation board for the MPQ5073, a 2A programmable-current load switch with 50mΩ R_DS(ON), AEC-Q100 qualified, supporting 0.5V–5.5V input and delivering regulated output current via external ILIM resistor. It integrates soft-start, power-good indication, output discharge, and <200ns short-circuit protection - deployed in notebook, tablet, SSD, and handheld power rail validation.

For engineers reviewing the EVQ5071-G-00A datasheet, EVQ5071-G-00A pinout, EVQ5071-G-00A application, or EVQ5071-G-00A equivalent, this board enables rapid characterization of MPQ5073's adjustable current limiting (2.5A range), thermal shutdown behavior, EN-controlled sequencing, and VOUT transient response under 3–5.5V input conditions.

Technical Context

The EVQ5071-G-00A implements the MPQ5073 QFN-12 (2mm×2mm) load switch IC in a fully assembled, test-ready layout with VIN, VOUT, EN, ILIM, PG, and SS terminals accessible via solder pads and test points. It uses four 22µF X5R 0805 output capacitors and dual 0.1µF X7R 0603 bypass caps to stabilize regulation across 3–5.5V operation.

Board-level functions include hardware-enforced 2A continuous current limit (set by 13kΩ R1), soft-start timing controlled by C4, and real-time current monitoring via VIMON pin. All critical signals - including EN logic thresholds (0.4V/2.6V), PG assertion delay (<100µs), and thermal foldback activation - are directly measurable on the board.

Key Specifications

Availability

EVQ5071-G-00A is available at Aetrix Electronics and suitable for notebook power validation, SSD rail bring-up, and portable device subsystem testing requiring stable component supply, traceable evaluation hardware, and documented thermal performance data.

Supply support for EVQ5071-G-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 power management ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The EVQ5071-G-00A belongs to MPS's load switch evaluation platform family, engineered to accelerate qualification of programmable-current, low-R_DS(ON) switches in automotive infotainment, computing, and industrial edge applications.

FAQ

What is the function of the R1 resistor on the EVQ5071-G-00A board?

R1 (13 kΩ, 0603 film resistor) connects ILIM to GND and sets the MPQ5073's output current limit to 2 A per the device's I_LIM = 100 µA × (13 kΩ)⁻¹ scaling law. Replacing R1 adjusts the trip point across the 0.5–2.5 A range without firmware changes.

Can the EVQ5071-G-00A operate below 3 V input?

No - the board is validated for 3 V to 5.5 V input per its test report and schematic design. While the underlying MPQ5073 supports down to 0.5 V, the EVQ5071-G-00A's capacitor selection, layout, and PG threshold are optimized for ≥3 V operation.

How is power-good (PG) functionality verified on this board?

PG is routed to a dedicated test pad and asserts high within 100 µs after VOUT reaches 90% of target. The signal drives a 100 kΩ pull-up (R2) and is observable with oscilloscope probing - confirming proper startup sequencing and fault latching behavior.

Does the board support output discharge during disable?

Yes - when EN is pulled low, the internal 120 Ω discharge FET activates automatically, discharging VOUT through a 120 Ω path to GND. This is confirmed by measuring VOUT decay time (typically <5 ms with 22 µF total capacitance).

What is the purpose of C4 on the EVQ5071-G-00A schematic?

C4 (0.1 µF, 0603 X7R) controls soft-start slew rate by setting the ramp time of the internal gate driver. Larger values increase rise time linearly; default value yields ~1.5 ms VOUT ramp under 2 A load, preventing inrush-induced supply droop.

Is the EVQ5071-G-00A AEC-Q100 qualified?

The board itself is not qualified; however, it evaluates the MPQ5073GG IC, which is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient). Board-level thermal design and component selection align with automotive reliability requirements for lab validation.