Monolithic Power Systems Inc. MPQ4569GN-AEC1-P

Overview

MPQ4569GN-AEC1-P from Monolithic Power Systems is a 75V, 0.3A AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter with integrated high-side (1.2Ω) and low-side (0.45Ω) MOSFETs, 1% FB reference accuracy at room temperature, programmable soft-start, and 5μA shutdown current - designed for automotive power rails requiring wide input range (4.5V–75V) and thermal robustness up to +125°C junction.

For engineers reviewing the MPQ4569GN-AEC1-P datasheet, MPQ4569GN-AEC1-P pinout, MPQ4569GN-AEC1-P application, or MPQ4569GN-AEC1-P equivalent, this device supports critical automotive subsystems where input transients, battery backup operation, and functional safety compliance are mandatory design constraints.

Technical Context

The MPQ4569GN-AEC1-P implements a constant-on-time (COT)-derived control scheme with zero-current detection (ZCD), enabling fast transient response and stable operation across wide VIN and load ranges. Its internal 1V reference feeds the FB comparator, while the dedicated BIAS pin allows external biasing (>2.9V) to improve efficiency by powering the internal regulator and LS-FET driver independently of VIN.

It integrates thermal shutdown (175°C trip, 20°C hysteresis), UVLO (4.2V rising / 3.75V falling), and open-drain POK output (90% VOUT threshold, 40μs deglitch) - all validated per AEC-Q100 Grade 1 (−40°C to +125°C TJ). The SOIC-8 EP package provides 48°C/W θJA on a 4-layer PCB, supporting industrial-grade thermal management in constrained automotive modules.

Key Specifications

Pinout & Package

MPQ4569GN-AEC1-P uses the SOIC-8 EP (exposed pad) package, optimized for thermal performance in automotive under-hood applications. The exposed pad must be soldered to a large PCB copper area for effective heat transfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MPQ4569GQ-AEC1, the MPQ4569GN-AEC1-P offers superior mechanical reliability and easier thermal management in production automotive assemblies, while LM61480-Q1 trades input voltage headroom for higher current capability - making MPQ4569GN-AEC1-P the sole choice for 75V-compliant, 0.3A precision power delivery.

Availability

MPQ4569GN-AEC1-P is available at Aetrix Electronics and suitable for automotive ADAS modules, body control units, and telematics systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle assurance.

Supply support for MPQ4569GN-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 analog and power ICs, with over two decades of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.

The MPQ4569 product line delivers AEC-Q100-qualified buck converters targeting automotive subsystems that demand ultra-wide input range, low quiescent current, and robust thermal protection - specifically engineered for next-generation electrified and autonomous vehicles.

FAQ

What is the maximum allowable input voltage for MPQ4569GN-AEC1-P, and how does it handle load-dump events?

The absolute maximum input voltage is +80V, with recommended operation up to +75V. During ISO 7637-2 Pulse 5a load-dump transients (up to 75V for 400ms), the device remains functional due to integrated high-voltage MOSFETs and internal clamping - verified across AEC-Q100 stress tests including HTOL at 125°C.

Can the MPQ4569GN-AEC1-P operate with an input voltage below 5V, such as during cold-crank conditions?

Yes - its UVLO rising threshold is 4.2V (min 3.9V), allowing reliable startup down to 4.5V input. At 4.5V VIN, the device delivers full 0.3A output at VOUT ≥ 1V, maintaining regulation until input drops below UVLO falling threshold (3.75V), which provides margin for brief cranking dips.

How is thermal performance affected when using the SOIC-8 EP package without a thermal pad connection?

Without soldering the exposed pad to a thermal copper plane, θJA degrades from 48°C/W to >80°C/W, reducing max power dissipation from 2.6W to <1.5W at TA=25°C. This may trigger thermal shutdown above 150mA load at 75V input - full thermal pad connection is mandatory for AEC-Q100 compliance and rated 0.3A operation.

Does the MPQ4569GN-AEC1-P support output voltages below 1V, and what limits the minimum adjustable output?

No - the internal 1V reference and FB comparator architecture fix the minimum regulated output at 1V. Output voltage is set by R4/R5 divider per VOUT = 1V × (1 + R4/R5); selecting R4 = 0Ω yields VOUT = 1V, the lowest possible value. Lower outputs require external amplification or a different controller topology.

What is the purpose of the BIAS pin, and what happens if it is left unconnected?

The BIAS pin supplies power to the internal regulator and LS-FET driver. If left unconnected, the device defaults to VIN-powered operation - functional but less efficient, especially at high VIN, due to higher quiescent current in the internal LDO. Connecting BIAS to a clean 3.3V–5V rail improves full-load efficiency by ~2–3%.

Is the POK output available on the MPQ4569GN-AEC1-P, and how is it configured?

No - POK is only available on the QFN-10 package (MPQ4569GQ-AEC1). The SOIC-8 EP variant (MPQ4569GN-AEC1-P) omits the POK pin; system-level power-good monitoring must be implemented externally using a voltage supervisor IC or microcontroller ADC sampling.

How does the soft-start function interact with short-circuit recovery?

During short-circuit recovery, the SS voltage tracks FB and resets if VFB drops significantly - effectively restarting the soft-start ramp. This prevents output overshoot when the fault clears, eliminating need for external reset circuitry and ensuring safe re-regulation without manual intervention.