Monolithic Power Systems Inc. MPQ5850GJ-P

Overview

MPQ5850GJ-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified smart diode controller that drives an external N-channel MOSFET to replace Schottky diodes for reverse input protection in automotive power rails. It delivers 20mV ultra-low dropout, 4μA shutdown current, and supports cold-crank operation down to 0V - enabling robust reverse polarity and load-dump protection in ADAS cameras and infotainment head units.

For engineers reviewing the MPQ5850GJ-P datasheet, MPQ5850GJ-P pinout, MPQ5850GJ-P application, or MPQ5850GJ-P equivalent, this device is selected for high-reliability 12V/24V automotive systems requiring low quiescent current, fast transient response per ISO16750, integrated boost for gate drive at low VIN, and PG indication for reservoir regulation status.

Technical Context

The MPQ5850GJ-P implements a dual-loop control architecture: a precision 20mV source-to-drain regulation loop for forward conduction and independent fast pull-up (75mV threshold) and pull-down (-4mV threshold) comparators for sub-microsecond MOSFET switching during reverse or AC rectification events. Its internal boost converter operates in fixed peak-current mode with 220mA current limit and regulates RES to 12V ±2V.

It features dedicated EN/UVLO logic with 1.2V enable threshold and 200mV hysteresis, open-drain PG output asserting low on RES undervoltage, fast pull-up active >17μs, or part disable, and thermal shutdown at 175°C with 25°C hysteresis - all validated across -40°C to +150°C junction temperature.

Key Specifications

Pinout & Package

MPQ5850GJ-P is housed in a thermally enhanced TSOT23-8 package (2mm × 3mm, 0.65mm pitch) with exposed thermal pad. Pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart diode controller applications.

Compared with LM74610-Q1 and TPS43060-Q1, MPQ5850GJ-P uniquely combines integrated boost, 20mV regulation, 4μA shutdown, and dedicated reverse-current turn-off - making it the only AEC-Q100 Grade 1 option for cold-crank-capable reverse protection in space- and power-constrained ADAS modules.

Availability

MPQ5850GJ-P is available at Aetrix Electronics and suitable for automotive ADAS camera modules, digital instrument clusters, infotainment head units, and battery-powered telematics control units requiring stable component supply across extended temperature and automotive transient environments.

Supply support for MPQ5850GJ-P 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 applications, with design centers in the US, China, and Taiwan.

The MPQ5850 product line targets AEC-Q100-compliant reverse input protection in automotive subsystems, emphasizing ultra-low dropout, cold-crank resilience, and integrated gate drive - specifically engineered for ADAS, infotainment, and body electronics.

FAQ

What external MOSFET parameters are critical for optimal MPQ5850GJ-P performance?

Optimal MOSFET selection requires R_DS(on) ≤ 5mΩ at V_GS = 10V to maintain <20mV dropout at rated current, Q_g ≤ 30nC for fast 300ns rise time, and V_GS(th) ≤ 2.5V to ensure full enhancement with 12V RES supply. The MOSFET must also withstand -36V V_DS and 42V transients per AEC-Q100 stress requirements.

How does the MPQ5850GJ-P handle cold-crank conditions where VIN drops to 0V?

During cold-crank, the MPQ5850GJ-P remains operational because its internal boost converter sustains RES at 12V using energy stored in the DRAIN-to-GND capacitor, enabling continuous gate drive even when VIN falls below 2.8V UVLO threshold. The device continues regulating V_SD to 20mV until VIN recovers.

Can the PG pin be left floating, or must it be pulled up externally?

The PG pin is open-drain and must be pulled up externally with a resistor (typically 10kΩ to 3.3V or 5V) to generate a valid logic-high signal when active. Leaving it floating results in indeterminate voltage and unreliable system monitoring; connecting directly to GND forces constant low assertion and disables status reporting.

What is the minimum recommended capacitor value between RES and DRAIN pins?

A minimum 1μF X7R ceramic capacitor is required between RES and DRAIN to stabilize the internal boost regulator's feedback loop and suppress high-frequency ripple. This capacitor must be placed within 2mm of the RES and DRAIN pins to minimize inductance and prevent oscillation during fast load transients.

Does the MPQ5850GJ-P support bidirectional current flow for regenerative braking applications?

No. The MPQ5850GJ-P is designed exclusively for unidirectional forward conduction with reverse polarity protection. It actively disables the external MOSFET on reverse current (V_SD < -4mV) and does not support controlled reverse conduction or energy recovery - it is not suitable for regenerative braking or bidirectional power paths.

How is thermal performance affected by PCB layout in the TSOT23-8 package?

Thermal resistance θ_JA drops from 85°C/W (standard 4-layer JEDEC board) to ≤55°C/W with a 25mm² copper pour connected to the exposed thermal pad via ≥4 thermal vias. Without proper pad connection, junction temperature can exceed 150°C at 500mA load, triggering thermal shutdown.

Is the 100kHz AC rectification capability dependent on external component selection?

Yes. Achieving 100kHz rectification requires a MOSFET with Q_g ≤ 15nC and gate resistor ≤ 2Ω to meet the 300ns rise/100ns fall time targets. Additionally, the DRAIN-to-GND bulk capacitor must be low-ESR (≤10mΩ) and ≥10μF to maintain stable gate drive during high-frequency current reversals.