Monolithic Power Systems Inc. MPQ5850GJ-AEC1-Z

Overview

MPQ5850GJ-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified smart diode controller that drives an external N-channel MOSFET for reverse input protection in automotive power rails. It delivers 20mV ultra-low dropout, 4μA shutdown current, and supports cold-crank down to 0V - enabling reliable operation during severe battery transients in ADAS camera modules and infotainment head units.

For engineers reviewing the MPQ5850GJ-AEC1-Z datasheet, MPQ5850GJ-AEC1-Z pinout, MPQ5850GJ-AEC1-Z application, or MPQ5850GJ-AEC1-Z equivalent, this device is selected for high-reliability reverse polarity protection where low quiescent current, fast transient response to load dump (up to 42V), and integrated boost regulation are critical design requirements.

Technical Context

The MPQ5850GJ-AEC1-Z implements a dual-path gate control architecture: a precision 20mV source-to-drain regulation loop for steady-state forward conduction, and independent fast pull-up (75mV threshold) and fast pull-down (-4mV threshold) comparators for sub-microsecond MOSFET switching during AC rectification or reverse-current events. Its internal boost converter generates a regulated RES voltage (12V typ.) from VIN as low as 2.8V, sustaining gate drive even during cold-crank.

It integrates a power-good (PG) flag with three failure conditions: chip disable, RES undervoltage, or fast pull-up timeout (>17μs). All circuitry operates across -40°C to +150°C junction temperature, with absolute maximum ratings including -36V SOURCE/EN/UVLO tolerance and 42V DRAIN blocking - meeting ISO 16750-2 pulse requirements without external clamping.

Key Specifications

Pinout & Package

MPQ5850GJ-AEC1-Z is housed in a TSOT23-8 package (2mm × 3mm, 0.65mm pitch), optimized for space-constrained automotive PCBs. Thermal resistance θ_JA = 85°C/W on 4-layer JEDEC board.

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-AEC1-Z uniquely combines integrated boost, 20mV dropout, and PG flag in a TSOT23-8 package - making it the only AEC-Q100 Grade 1 solution for space-constrained, cold-crank–capable reverse protection.

Availability

MPQ5850GJ-AEC1-Z is available at Aetrix Electronics and suitable for automotive ADAS camera systems, infotainment head units, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for MPQ5850GJ-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 computing markets.

The MPQ5850 product line is designed specifically for automotive reverse-input protection, emphasizing ultra-low dropout, cold-crank resilience, and integrated gate drive - targeting ADAS, infotainment, and body electronics.

FAQ

What external MOSFET parameters are recommended for use with MPQ5850GJ-AEC1-Z?

The MPQ5850GJ-AEC1-Z drives N-channel MOSFETs with V_DS ≥40V and R_DS(on) ≤10mΩ at V_GS = 10V. Gate charge Q_g should be ≤35nC to ensure full enhancement within 2μs. Recommended parts include SiR872DP and SQJQ910E, both qualified for automotive use and compatible with the 12V RES supply.

How does the MPQ5850GJ-AEC1-Z handle load dump transients up to 42V?

The MPQ5850GJ-AEC1-Z withstands 42V on the DRAIN pin continuously and features -36V blocking on SOURCE/EN/UVLO pins. During load dump, its internal clamp limits RES voltage to 14V max, and the gate driver maintains MOSFET enhancement - verified per ISO 16750-2 Pulse 5a with no latch-up or parameter shift.

Can the PG pin be left floating if not used in the system?

No - the PG pin must be either pulled up to a valid logic-high voltage (≤6V) via a 10kΩ resistor or connected to GND. Floating PG may cause undefined logic states and interfere with system fault detection. When unused, tie PG to GND to disable the open-drain output.

What is the minimum input voltage required for the internal boost converter to regulate RES?

The boost converter starts switching when DRAIN voltage exceeds 2.8V (typ.) and maintains RES regulation down to V_DRAIN = 2.4V (min.). Below 2.4V, RES falls out of regulation but the device remains functional - gate drive degrades gradually, supporting cold-crank operation to 0V with external MOSFET selection optimized for low-V_GS.

Is the MPQ5850GJ-AEC1-Z pin-compatible with earlier MPQ5850GJ variants?

Yes - MPQ5850GJ-AEC1-Z shares identical pinout, package (TSOT23-8), and electrical characteristics with MPQ5850GJ. The "-AEC1" suffix denotes AEC-Q100 Grade 1 qualification and enhanced test screening; no layout or schematic changes are required for migration.

Does the MPQ5850GJ-AEC1-Z require external compensation components?

No - all regulation loops (V_SD, RES, fast pull-up/down) are internally compensated. Only two external passive components are mandatory: a 68μH inductor between SW and DRAIN, and a ≥1μF ceramic capacitor between RES and DRAIN. No RC networks or feedback dividers are needed.

How is reverse-current detection implemented, and what is its response time?

Reverse current is detected by sensing negative V_SD across SOURCE and DRAIN. When V_SD ≤ -4mV, the fast pull-down comparator triggers within 100ns, sinking 430mA to discharge the MOSFET gate. This action turns off the MOSFET before reverse current exceeds 100mA - validated with 100ns oscilloscope measurements on EVQ5850-J-00A evaluation board.