Monolithic Power Systems Inc. MPQ4590GS-AEC1-P

Overview

MPQ4590GS-AEC1-P from Monolithic Power Systems is an AEC-Q100 qualified primary-side constant-voltage regulator with integrated 640V/13.5Ω MOSFET, supporting buck/buck-boost/boost/flyback topologies. It delivers up to 400mA output current in CCM, achieves <30mW no-load power consumption, and operates across –40°C to +125°C junction temperature for automotive PTC heater and EV standby power applications.

For engineers reviewing the MPQ4590GS-AEC1-P datasheet, MPQ4590GS-AEC1-P pinout, MPQ4590GS-AEC1-P application, or MPQ4590GS-AEC1-P equivalent, key selection criteria include its primary-side CV control architecture, 640V drain rating, SOIC-8 package thermal performance (θJA = 96°C/W), AEC-Q100 Grade 1 qualification, and green-mode frequency foldback behavior under light load.

Technical Context

The MPQ4590GS-AEC1-P implements primary-side regulation using feedback sampling via external capacitor C3, eliminating optocoupler dependency. Its internal error amplifier compares FB voltage against a 2.55V reference, while ramp compensation dynamically adjusts based on peak current to improve load regulation.

Protection logic integrates five autonomous mechanisms: thermal shutdown at 150°C (30°C hysteresis), VCC UVLO (5.3V turn-on / 5.6V turn-off), OLP triggered by FB <1.7V for ≥220ms, SCP at 750–900mA peak current, and open-loop detection at FB <0.5V - all enabling self-recovering fault response without external supervision.

Key Specifications

Pinout & Package

MPQ4590GS-AEC1-P is housed in a standard SOIC-8 package with exposed pad connected internally to DRAIN for thermal enhancement. Pin 1 (VCC) supplies control circuitry; Pin 2 (FB) samples output voltage; Pins 3/5/6/8 are NC; Pin 4 (SOURCE) serves as ground reference for VCC and FB; Pin 7 (DRAIN) connects to high-voltage input and internal MOSFET drain.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side CV regulator applications.

Compared with MPQ4590GS-AEC1-P, MPQ4570GS-AEC1-P trades voltage headroom and efficiency for lower cost, while UCC28910DR adds design flexibility at the expense of integration and component count - making MPQ4590GS-AEC1-P optimal for compact, AEC-Q100-compliant non-isolated 5W supplies.

Availability

MPQ4590GS-AEC1-P is available at Aetrix Electronics and suitable for automotive PTC heater control, EV standby power supply, industrial smart sensor hub, and home appliance auxiliary PSU requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ4590GS-AEC1-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, with over two decades of expertise in DC/DC converters, LED drivers, and motor drivers.

The MPQ4590 product line targets AEC-Q100-compliant primary-side regulated offline power supplies for automotive and industrial applications where space, cost, and light-load efficiency are critical constraints.

FAQ

What topology configurations does MPQ4590GS-AEC1-P support?

The MPQ4590GS-AEC1-P supports buck, buck-boost, boost, and flyback topologies. Its primary-side CV regulation eliminates optocouplers in non-isolated buck/buck-boost/boost, while flyback implementation provides isolation. The internal 640V MOSFET and SOURCE-referenced FB pin enable direct high-side switching in all configurations without level-shifting circuitry.

How does the green-mode operation reduce no-load power consumption?

Green-mode operation reduces both switching frequency and peak current limit as load decreases. At no load, frequency drops below 20kHz and peak current compresses toward 240mA, minimizing switching losses and gate drive energy. Combined with <200μA internal IC consumption in no-switching state, this achieves <30mW total no-load input power without auxiliary windings or external bias circuits.

What is the purpose of the 350ns leading-edge blanking (LEB) on the current sense path?

The 350ns LEB disables the current comparator immediately after MOSFET turn-on to ignore parasitic turn-on spikes from diode reverse recovery and layout inductance. This prevents false SCP triggering during normal switching transitions, ensuring reliable operation in high-dV/dt environments like universal-input offline converters with fast freewheeling diodes.

Can MPQ4590GS-AEC1-P be used without a dummy load?

A minimum 3mA dummy load is required for stable regulation at light loads because the FB sampling capacitor (C3) relies on inductor energy transfer to hold output voltage. Removing the dummy load causes C3 discharge between cycles, resulting in FB voltage droop below 2.55V and uncontrolled regulation. Zener-based dummy loads can reduce no-load consumption if regulation accuracy is relaxed.

What are the PCB layout requirements for thermal performance?

Thermal performance depends on connecting the SOIC-8 exposed pad (internally tied to DRAIN) to a large copper pour with multiple thermal vias to inner/ground planes. Input/output power loops must be minimized; FB capacitor (several hundred pF) must be placed directly between FB and SOURCE pins; and high-current paths (DRAIN–SOURCE–inductor–diode) should avoid crossing sensitive analog traces to prevent noise coupling into the 2.55V reference path.

How does open-loop protection trigger and recover?

Open-loop protection triggers when FB voltage falls below 0.5V for >100μs, indicating loss of feedback signal or failed sampling capacitor. The IC stops switching and discharges VCC to 2.4V via internal current source. Recovery begins when VCC recharges above 5.3V and FB rises above 0.5V - requiring external circuit correction (e.g., fixing C3 or R1/R2 values) before restart.

Is MPQ4590GS-AEC1-P RoHS and halogen-free compliant?

Yes, MPQ4590GS-AEC1-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive. All packaging materials and die attach compounds meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements, and the device carries MPS's official green status per their Quality Assurance documentation.