Monolithic Power Systems Inc. MPQ4569GN-AEC1

Overview

MPQ4569GN-AEC1 from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter with integrated 1.2Ω high-side and 0.45Ω low-side MOSFETs, delivering up to 0.3A output current across a 4.5V–75V input range. It features 1% FB reference tolerance at room temperature, 5μA shutdown quiescent current, and thermal shutdown protection - designed for automotive front-end power rails such as infotainment head units and ADAS camera modules.

For engineers reviewing the MPQ4569GN-AEC1 datasheet, MPQ4569GN-AEC1 pinout, MPQ4569GN-AEC1 application, or MPQ4569GN-AEC1 equivalent, key selection criteria include its wide VIN range compatibility with 12V/24V/48V automotive batteries, SOIC-8 EP package thermal performance (θJA = 48°C/W), and precision 1V internal reference enabling stable 3.3V/5V/12V outputs in harsh ambient conditions.

Technical Context

The MPQ4569GN-AEC1 implements a current-mode PWM control scheme with zero-current detection (ZCD) and programmable soft-start, enabling precise peak-current limiting (720mA typical) and controlled startup without output overshoot. Its internal 2.6V regulator powers core logic, while the BIAS pin allows external biasing above 2.9V to improve efficiency and support LS_FET driver operation.

It integrates under-voltage lockout (UVLO rising threshold 4.2V, hysteresis 0.45V), open-drain POK monitoring (90% VOUT trip), and adaptive frequency scaling at light load to reduce switching losses - all operating reliably from –40°C to +125°C junction temperature per AEC-Q100 Grade 1 requirements.

Key Specifications

Pinout & Package

MPQ4569GN-AEC1 uses the SOIC-8 EP (exposed pad) package, optimized for thermal reliability in automotive under-hood environments. The exposed thermal pad must be soldered to a dedicated PCB copper pour for effective junction-to-board heat transfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM61480-Q1 and TPS543B20-Q1, MPQ4569GN-AEC1 delivers optimal balance of ultra-low standby power, wide-input resilience, and AEC-Q100 Grade 1 assurance in a thermally robust SOIC-8 EP footprint - making it uniquely suited for sub-0.5A automotive subsystems where reliability and quiescent current dominate selection criteria.

Availability

MPQ4569GN-AEC1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ4569GN-AEC1 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 targets automotive-grade DC/DC conversion, emphasizing AEC-Q100 qualification, wide-input capability, and low-quiescent-current operation for next-generation vehicle electrification and ADAS platforms.

FAQ

What is the maximum allowable input voltage for MPQ4569GN-AEC1?

The absolute maximum input voltage is +80V, but the recommended operating range is 4.5V to 75V. This 75V upper limit ensures reliable operation during ISO 7637-2 load-dump transients common in 12V and 24V automotive systems, with built-in overvoltage protection preventing damage during surge events.

Does MPQ4569GN-AEC1 support adjustable output voltage?

Yes - output voltage is set externally using a resistive divider from VOUT to the FB pin. With a precise 1.0V ±1% internal reference, common outputs like 3.3V (R4=1200kΩ, R5=523kΩ) and 5V (R4=1200kΩ, R5=300kΩ) are achieved with <±1% accuracy across temperature and line regulation.

How does the BIAS pin improve efficiency?

When supplied with 2.9V–5.5V (e.g., from the regulated output), the BIAS pin powers the internal regulator and LS_FET driver, reducing dependency on VIN and lowering overall power loss. This configuration improves full-load efficiency by up to 3% compared to VIN-only operation, especially at lower input voltages.

Is the POK signal compatible with 3.3V logic systems?

Yes - POK is an open-drain output with 0.4V max low-level voltage at 1mA sink current. It can be pulled up to any logic rail (1.8V, 3.3V, or 5V) and asserts HIGH when VOUT exceeds 90% of its nominal value, enabling direct interfacing with microcontroller GPIOs or power sequencers.

What is the minimum inductor value supported?

The minimum inductor value is determined by the 120ns minimum on-time and maximum input voltage: L_MIN = V_IN(MAX) × t_ON(MIN) / I_PEAK. For 75V_IN and 720mA peak current, L_MIN ≈ 12.5μH. A 33μH inductor (as used in typical applications) ensures stable CCM operation and adequate margin for worst-case conditions.

Can MPQ4569GN-AEC1 operate without the BIAS connection?

Yes - it operates fully functional with BIAS left unconnected or tied to GND. In this mode, the internal 2.6V regulator derives power from VIN. However, connecting BIAS to a stable ≥2.9V source (e.g., VOUT) improves efficiency, reduces thermal stress, and enables full LS_FET driver performance - recommended for production designs.

How is thermal performance validated for AEC-Q100 Grade 1?

Thermal shutdown is triggered at 175°C with 20°C hysteresis, and the device is characterized across –40°C to +125°C junction temperature per AEC-Q100 stress test requirements. SOIC-8 EP package thermal resistance (θJA = 48°C/W) is measured per JESD51-7 on a 4-layer PCB, ensuring repeatable performance in automotive thermal environments.