Monolithic Power Systems Inc. MPQ5871GRPE-AEC1-Z

Overview

MPQ5871GRPE-AEC1-Z from Monolithic Power Systems is a single-channel, AEC-Q100 Grade 1 qualified smart high-side load switch designed for automotive power distribution. It operates from 3.5V to 36V input, integrates a 60mΩ N-channel MOSFET, delivers ±4% current-sense accuracy at 1A, and supports real-time fault reporting via the FT/CS pin - deployed in ADAS domain controllers and infotainment power rails.

For engineers reviewing the MPQ5871GRPE-AEC1-Z datasheet, MPQ5871GRPE-AEC1-Z pinout, MPQ5871GRPE-AEC1-Z application, or MPQ5871GRPE-AEC1-Z equivalent, key selection criteria include its wettable-flank QFN-8 package, 0.5µA standby current with diagnostics disabled, dual internal/external current limiting (2A fixed / configurable down to 0.5A), and full on/off-state open-load and battery-short detection capability.

Technical Context

The MPQ5871GRPE-AEC1-Z implements a charge-pump–driven N-channel high-side switch with integrated diagnostics logic, thermal shutdown (175°C), and programmable slew-rate control via external SS capacitor. Its current-sense architecture uses a precision 1:1000 mirror ratio (KCS) referenced to load current, enabling accurate real-time monitoring without calibration across -40°C to +150°C.

Protection features include fast-turn-off (<1µs) over-current response, 800µs deglitch-timed current-limit shutdown, auto-recovery after 300ms, and configurable off-state diagnostics enabled by DIAG_EN pin logic level. The device supports both cold-crank (down to 3.5V) and load-dump (up to 42V) transients per AEC-Q100-012 Test Grade A.

Key Specifications

Pinout & Package

MPQ5871GRPE-AEC1-Z is housed in a wettable-flank QFN-8 package (2mm × 2.5mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and high-reliability automotive soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Compared with TPS4H160-Q1 and STL303M3, MPQ5871GRPE-AEC1-Z uniquely combines AEC-Q100 Grade 1 qualification, wettable flank packaging, ±4% current sensing, and 0.5µA standby current - making it the only option meeting full ASIL-B diagnostic coverage and space-constrained automotive ECU requirements.

Availability

MPQ5871GRPE-AEC1-Z is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment display backlights, and body control module sub-loads requiring stable component supply, long-term lifecycle support, and AEC-Q100–compliant traceability.

Supply support for MPQ5871GRPE-AEC1-Z 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 consumer markets, with design centers in the US, China, and Taiwan.

The MPQ5871 belongs to MPS's AEC-Q100–qualified smart power switch product line, engineered specifically for automotive subsystems demanding functional safety, ultra-low quiescent current, and robust transient immunity.

FAQ

What is the maximum allowable VIN transient the MPQ5871GRPE-AEC1-Z can withstand?

The device is rated for 42V load-dump transients per AEC-Q100-012 Test Grade A, with absolute maximum VIN of +42V. This rating is validated across temperature and includes margin for system-level clamping circuits - no external TVS is required for standard 12V automotive load-dump compliance.

How does the FT/CS pin distinguish between different fault conditions?

FT/CS reports faults via distinct voltage levels: linear V_CS (0–3V) for normal operation; ~4.4V for over-current, thermal shutdown, or off-state open-load/battery short; and sub-0.5V for on-state open-load. These thresholds are internally generated and temperature-compensated, enabling unambiguous fault classification without external logic.

Can the MPQ5871GRPE-AEC1-Z drive inductive loads like solenoids or relays?

Yes - it supports inductive switch-off energy dissipation up to 50mJ (tested at 13.5V, 10mH, 0Ω). For loads exceeding this, an external freewheeling diode or snubber is required. The device's fast turn-off (<1µs) prevents destructive voltage spikes during abrupt current interruption.

What is the minimum external current limit achievable with the ILIM pin?

The lowest guaranteed external current limit is 0.5A, with ±15% accuracy. Below this, accuracy degrades significantly; the datasheet explicitly recommends setting R_CL for ≥500mA to ensure valid operation during start-up and short-circuit conditions.

Does the MPQ5871GRPE-AEC1-Z require an external bootstrap capacitor?

No - it integrates a charge pump that self-generates gate drive voltage for the internal N-channel MOSFET. No external bootstrap components are needed, simplifying layout and eliminating reliability risks associated with discrete capacitor aging or placement errors.

How is thermal performance affected by PCB layout in the QFN-8 package?

Thermal resistance θ_JA drops from 67.2°C/W (JESD51-7 4-layer board) to 28°C/W on MPS's reference EVB (2oz copper, 4-layer, 6.35cm²). To achieve rated 4.46W power dissipation, use ≥4 thermal vias under the exposed pad, connect to inner ground planes, and avoid narrow traces on VIN/OUT paths.

Is the current-sense ratio KCS calibrated per unit or lot?

KCS is trimmed during wafer test and is a fixed, uncalibrated parameter - no per-unit or per-lot calibration is required. Its variation is ±0.6% over temperature and supply voltage, ensuring consistent 1:1000 mirroring across all units without firmware compensation.