Monolithic Power Systems Inc. MPQ4569GQ-P

Overview

MPQ4569GQ-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, 1V reference output, and Power Good (POK) signal - designed for automotive power rails requiring wide-input operation (4.5V–75V), ultra-low quiescent current (20μA active, 5μA shutdown), and thermal fault protection.

For engineers reviewing the MPQ4569GQ-P datasheet, MPQ4569GQ-P pinout, MPQ4569GQ-P application, or MPQ4569GQ-P equivalent, this device supports precision adjustable output voltage (via FB divider), programmable soft-start (SS pin), bootstrap gate drive (BST/SW), and robust startup/shutdown sequencing in harsh automotive environments - critical for ECU, ADAS camera modules, and infotainment power supplies.

Technical Context

The MPQ4569GQ-P employs a current-mode PWM control scheme with zero-current detection (ZCD) and internal 1V reference comparator to regulate output voltage. It dynamically scales switching frequency under light load to minimize gate driver and switching losses, while maintaining stable regulation across –40°C to +125°C junction temperature.

Its dedicated BIAS pin accepts 2.9V–5.5V external supply to power internal circuitry and LS-FET driver, improving efficiency over VIN-only biasing. The POK open-drain output asserts HIGH when VOUT exceeds 90% of nominal value, with 5% hysteresis and 40μs deglitch timing - enabling reliable system power sequencing and fault monitoring.

Key Specifications

Pinout & Package

MPQ4569GQ-P is housed in a QFN-10 (3mm × 3mm) package with wettable flanks and an exposed thermal pad (Pin 10 = GND). The pinout supports high-frequency switching with minimized parasitic inductance: SW and BST form a tightly coupled bootstrap loop; FB and VREF are isolated from noisy power nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4569GQ-P, MPQ4572GQ-AEC1 offers double the output current in identical footprint and feature set, while LM61480QRNXTQ1 trades integration for flexibility and power scalability - making MPQ4569GQ-P optimal for cost-sensitive, space-constrained 0.3A automotive rails.

Availability

MPQ4569GQ-P is available at Aetrix Electronics and suitable for automotive ECU power supplies, ADAS camera modules, infotainment display rails, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for MPQ4569GQ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4569 product line delivers AEC-Q100 qualified, high-voltage synchronous buck converters optimized for automotive subsystems demanding wide input range, ultra-low quiescent current, and integrated protection features - targeting ECU, ADAS, and body electronics.

FAQ

What is the maximum allowable input voltage for MPQ4569GQ-P, and what protection exists beyond normal operation?

The absolute maximum VIN rating is +80V, with recommended operation up to 75V. Beyond this, internal VIN UVLO (rising threshold 4.2V, hysteresis 0.45V) prevents startup below minimum supply, while thermal shutdown (175°C) and current limiting (720mA typical peak) protect against overloads. The device is not rated for sustained operation above 75V.

Can MPQ4569GQ-P operate with input voltage below 4.5V, and how does EN pin behavior affect low-VIN scenarios?

No - the device requires ≥4.5V to exit UVLO and begin regulation. Below this, the EN pin remains inactive regardless of logic level. When VIN rises above 4.2V, EN becomes functional; its rising threshold is 1.55V, and it features an internal 3MΩ pull-down, allowing safe floating-disable during undervoltage conditions.

How is the POK signal used, and what are its electrical characteristics?

POK is an open-drain output asserting HIGH when VOUT ≥90% of nominal value (e.g., ≥2.97V for 3.3V output), with 5% hysteresis and 40μs deglitch timing. It pulls LOW during shutdown, startup, or output undervoltage. A 10kΩ pull-up to VOUT is typical; sink capability is 1mA at 0.4V.

What is the role of the BIAS pin, and when should it be used instead of VIN?

BIAS supplies power to the internal regulator and LS-FET driver. Use BIAS when the output voltage is 2.9V–5.5V (e.g., tie to 3.3V or 5V rail) to reduce input current and improve efficiency - especially beneficial above 12V VIN. Do not connect BIAS if VOUT <2.9V or >5.5V; in those cases, use external 3.3V/5V supply.

Is the VREF pin mandatory for operation, and what load can it drive?

VREF is optional - the internal 1V reference is always active for FB comparison. VREF provides an external-accessible copy with ±1% accuracy and 500μA sourcing capability, useful for precision feedback networks or biasing external circuitry. Do not load VREF beyond 500μA to maintain accuracy.

How does the soft-start capacitor value affect startup behavior, and what is the recommended range?

SS is charged by a 5μA internal current source; soft-start time t_SS ≈ C_SS × 1V / 5μA. For 20ms ramp, use 100nF; for 100ms, use 500nF. Values <10nF cause insufficient ramp time and risk overshoot; >1μF extends startup unnecessarily and may delay system readiness.

Does MPQ4569GQ-P support forced PWM mode, or is it strictly auto-frequency scaling?

It operates exclusively in auto-frequency scaling (pulse-frequency modulation) mode - no external pin or register controls fixed-frequency operation. Frequency decreases under light load to reduce switching loss, and increases with output current up to ~1MHz at full 0.3A load. This is inherent to its ZCD-based control architecture.