Monolithic Power Systems Inc. EVQ5871-RP-00A

Overview

EVQ5871-RP-00A from Monolithic Power Systems is a dedicated evaluation board for the MPQ5871GRPE-AEC1 smart high-side load switch, supporting 3.5V–36V input, 1A continuous load, 60mΩ R_DS(on), AEC-Q100 Grade 1 qualification, and real-time current sensing via FT/CS pin. It enables rapid validation of inrush control, short-circuit protection, open-load diagnostics, and soft-start behavior in automotive power distribution systems.

For engineers reviewing the EVQ5871-RP-00A datasheet, EVQ5871-RP-00A pinout, EVQ5871-RP-00A application, or EVQ5871-RP-00A equivalent, this board provides hands-on verification of MPQ5871's diagnostic modes (standby/diagnostic/normal), configurable current limit (internal or external), fault reporting accuracy (1/1000 scaling), and cold-crank/load-dump resilience up to 42V.

Technical Context

The EVQ5871-RP-00A implements the full functional interface of the MPQ5871 IC, including EN and DIAG_EN logic control, FT/CS analog current-sense output (0–3V linear range), SS capacitor-based slew-rate control, and ILIM configuration for dual-mode overcurrent protection. All signals are brought out to test points and jumpers (CN1–CN3) for flexible mode selection.

It replicates automotive-grade thermal and electrical stress conditions: supports 42V load dump, operates across –40°C to +125°C ambient (via AEC-Q100-qualified IC), and integrates reverse-polarity protection (D1/R5 network at CN3). Board-level decoupling (C1–C4) and layout follow MPS's 2oz copper PCB guidelines for low-inductance power paths.

Key Specifications

Availability

EVQ5871-RP-00A is available at Aetrix Electronics and suitable for automotive ECU power sequencing, ADAS sensor module enablement, and infotainment system load management requiring stable component supply, AEC-Q100-compliant validation, and fast-turn prototyping support.

Supply support for EVQ5871-RP-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 for automotive, industrial, and computing applications, with design centers in the US, China, and Taiwan.

The MPQ5871 product line delivers AEC-Q100-qualified smart power switches for 12V/24V vehicle subsystems, emphasizing diagnostic integrity, inrush control, and fault-reporting precision-enabling safer, more reliable load switching in safety-critical domains.

FAQ

What is the purpose of CN3 on the EVQ5871-RP-00A board?

CN3 connects a reverse-polarity protection network (D1 and R5) across the input ground path. When shorted, it enables clamping of negative voltage transients during incorrect battery connection or inductive load flyback. Leaving CN3 open disables this protection, allowing direct GND routing for noise-sensitive measurements.

How do I configure off-state open-load detection?

Short jumper CN1 to enable off-state open-load detection. This activates the MPQ5871's internal diagnostic circuitry that applies a small test current to VOUT while EN=LOW and DIAG_EN=HIGH, then monitors FT/CS voltage to detect open circuits or battery shorts-verified per AEC-Q100-012 Test Grade A.

Can the EVQ5871-RP-00A be used with electronic loads?

No constant-current (CC) electronic load mode should be used, as it may trigger over-current protection and cause excessive MOSFET heating. Instead, use resistive or capacitive loads. For dynamic testing, apply step changes via EN or VIN while monitoring FT/CS and VOUT waveforms using oscilloscope channels CH1–CH4 as shown in Figures 2 and 4–10.

What is the role of the SS capacitor (CSS) and how is its value selected?

CSS sets the output voltage ramp time during soft-start. An internal 10μA current source charges CSS, and VOUT rises as VSS × K_SS (K_SS ≈ 16.7). Use Equation (2) from the Quick Start Guide: t_{VO_RISING} = (V_OUT × C_SS) / (10 × K_SS). Typical values range from 10nF to 100nF for 1–10ms rise times.

Does the board support both internal and external current limiting?

Yes. Short ILIM to GND via CN2 to activate the internal 1A current limit (V_{TH_LIM} = 0.7V, K_CL = 1000). For external limit, install a resistor R_CL between ILIM and GND, calculated as R_CL = (0.7V × 1000) / I_CL. The board includes pads and routing for either configuration.

Is the FT/CS pin calibrated, and what is its voltage range?

The FT/CS pin provides factory-trimmed current sensing with 1/1000 scaling (K_CS = 1000) across temperature and supply voltage. Its output is linear from 0V to 3V, corresponding to 0A–3A load current. No external calibration is required, and the 3V ceiling ensures compatibility with 3.3V ADC inputs.