Monolithic Power Systems Inc. MPQ4569GN

Overview

MPQ4569GN 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, 5μA shutdown current, and SOIC-8 EP package - designed for automotive power rails requiring wide input range (4.5V–75V) and robust thermal shutdown.

For engineers reviewing the MPQ4569GN datasheet, MPQ4569GN pinout, MPQ4569GN application, or MPQ4569GN equivalent, key selection criteria include its AEC-Q100 qualification, programmable soft-start via external capacitor, POK output (QFN only), VREF capability (QFN only), and BIAS pin for efficiency optimization in battery-supplied or high-reliability automotive subsystems.

Technical Context

The MPQ4569GN implements a constant-on-time (COT)-derived control scheme with zero-current detection (ZCD), enabling fast transient response without external compensation. It uses internal 1V reference voltage for feedback regulation and supports adjustable output via external resistor divider (VOUT = 1V × (1 + R4/R5)).

Its integrated power stage operates in forced PWM or light-load frequency scaling mode to minimize switching losses; thermal shutdown triggers at 175°C with 20°C hysteresis, and UVLO has 4.2V rising / 3.75V falling thresholds with 0.45V hysteresis - all validated across –40°C to +125°C junction temperature range.

Key Specifications

Pinout & Package

MPQ4569GN is housed in an SOIC-8 EP (exposed pad) package with 1.27mm pitch, optimized for thermal performance in automotive ambient conditions up to +105°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4569GN, MPQ4570GN offers direct 0.5A scalability in same footprint and qualification, while LM61480QRTWRQ1 serves distinct low-input/high-current use cases but lacks 75V tolerance and BIAS-driven efficiency optimization.

Availability

MPQ4569GN is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and ADAS camera modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ4569GN 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 MPQ4569GN belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment power conversion in vehicles - emphasizing wide VIN range, low I_Q, AEC-Q100 reliability, and integrated MOSFETs to simplify ECU power architecture.

FAQ

What is the maximum input voltage rating for MPQ4569GN?

The absolute maximum input voltage (VIN) is +80V, but the recommended operating range is 4.5V to 75V. Exceeding 75V may trigger UVLO shutdown or cause reliability degradation over time. The 75V rating aligns with ISO 7637-2 Pulse 5a load dump testing requirements for automotive applications.

Does MPQ4569GN provide a power-good (POK) signal?

No - the POK (Power Good) open-drain output is only available on the QFN-10 package variant (MPQ4569GQ). The SOIC-8 EP version (MPQ4569GN) omits the POK pin; system-level power monitoring must be implemented externally using the FB pin or dedicated supervisor IC.

Can the BIAS pin be left unconnected?

Yes, but not recommended. When unconnected, the internal 2.6V regulator powers the chip from VIN, reducing efficiency especially at light loads. Connecting BIAS to a clean 3.3V–5.5V regulated output improves conversion efficiency by up to 3% and lowers die temperature under sustained operation.

What is the minimum inductor value supported for MPQ4569GN?

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 input and 810mA peak current, L_MIN ≈ 11μH. Standard 33μH inductors (e.g., Coilcraft XAL4020-332) are recommended to ensure stable operation across full load and temperature range.

Is MPQ4569GN RoHS compliant and lead-free?

Yes - MPQ4569GN is fully RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC JS709B standards. All solderable surfaces use matte tin plating, and the SOIC-8 EP package is compatible with standard lead-free reflow profiles (peak 260°C).

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

During short-circuit recovery, the SS voltage tracks FB voltage downward and resets to zero when FB drops below nominal. Upon fault removal, SS ramps up from zero as if initiating a fresh startup - preventing output overshoot and ensuring controlled re-regulation without external intervention or reset signals.

What thermal derating applies to MPQ4569GN at 105°C ambient?

At 105°C ambient on a 4-layer PCB with SOIC-8 EP thermal pad soldered to 2-in² copper, θJA = 48°C/W yields ~1.04W max power dissipation before reaching 125°C junction limit. Derated output current is ~0.22A (based on P_LOSS = I² × R_DS(on) + switching losses), requiring careful layout and airflow in sealed enclosures.