Monolithic Power Systems Inc. MPQ2451GG-33-AEC1-P

Overview

MPQ2451GG-33-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 36V-input, 2.2MHz asynchronous step-down converter with integrated 500mΩ high-side MOSFET, delivering up to 0.6A at fixed 3.3V output. It features current-mode control, internal soft-start, and 130µA quiescent current-designed for automotive body electronics, infotainment power rails, and ADAS sensor modules requiring stable low-noise 3.3V supply under wide input transients.

For engineers reviewing the MPQ2451GG-33-AEC1-P datasheet, MPQ2451GG-33-AEC1-P pinout, MPQ2451GG-33-AEC1-P application, or MPQ2451GG-33-AEC1-P equivalent, this device supports fast transient response in automotive 12V/24V systems, offers verified thermal shutdown and UVLO protection, and integrates bootstrap charging control for reliable high-duty-cycle operation without external gate drivers.

Technical Context

The MPQ2451GG-33-AEC1-P implements peak-current-mode PWM control with internal compensation, enabling stable regulation across 3.3V–36V input while maintaining >90% efficiency at full load. Its 2.2MHz fixed switching frequency allows compact LC filter design using ≤3.3µH inductors and ceramic output capacitors.

Under light load, it enters pulse-skipping mode to reduce gate-driving and switching losses, lowering quiescent current to 1µA in shutdown and sustaining 130µA during active no-load operation. The dedicated EN pin provides precise enable/disable logic with 1.35V–1.8V rising threshold and 400mV hysteresis, supporting controlled sequencing in multi-rail automotive systems.

Key Specifications

Pinout & Package

MPQ2451GG-33-AEC1-P uses a thermally enhanced 2mm × 2mm QFN-6L package with exposed thermal pad, optimized for automotive PCB layouts requiring high power density and low thermal resistance (θ_JA = 80°C/W, θ_JC = 16°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2451GT-33-AEC1, the QFN-6L variant delivers 70% higher thermal performance for sustained 0.6A loads; versus TPS62130A-Q1, it trades higher current for wider input range and zero-resistor simplicity-critical for cost-sensitive, high-reliability automotive designs.

Availability

MPQ2451GG-33-AEC1-P is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, infotainment logic rails, and telematics units requiring stable component supply with full AEC-Q100 documentation and lot-level traceability.

Supply support for MPQ2451GG-33-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 automotive-grade power management.

The MPQ2451 series belongs to MPS's automotive-qualified buck converter product line, engineered specifically for harsh-environment vehicle subsystems where input voltage resilience, thermal robustness, and AEC-Q100 compliance are non-negotiable design requirements.

FAQ

What is the maximum recommended PCB copper area for thermal relief under the QFN-6L exposed pad?

The QFN-6L package requires a minimum 12mm² exposed pad connected to a solid ground plane via ≥6 thermal vias (15mil diameter, 40mil pitch). For continuous 0.6A operation at 125°C ambient, extend copper to ≥25mm² with 12 vias to achieve <110°C junction temperature per JEDEC JESD51-7 4-layer board standards.

Can MPQ2451GG-33-AEC1-P operate with a 2.5V input supply?

No. The device has a guaranteed minimum operating input voltage of 3.3V per datasheet Section 5 (Recommended Operating Conditions). Below 3.3V, the internal 2.6V regulator cannot sustain bias, causing UVLO activation and forced shutdown-even if VIN momentarily exceeds 2.5V during cold-crank recovery.

Is an external bootstrap diode required for reliable operation?

An external bootstrap diode (e.g., BAT54) is optional but recommended when VIN ≤ 6V or duty cycle exceeds 65% (VOUT/VIN > 0.65). It ensures sufficient BST voltage headroom during high-duty cycles where internal charging from VIN–SW may be insufficient-verified in Figure 2 of the datasheet.

How does the current limit behave across temperature?

The cycle-by-cycle current limit ranges from 0.65A at −40°C to 1.0A at +125°C (typical), with 0.75A–1.0A specified at 25°C. This positive temperature coefficient prevents premature current limiting during hot-start conditions while maintaining short-circuit protection at low temperatures.

Does the device support forced PWM mode to eliminate audible noise?

No. MPQ2451GG-33-AEC1-P lacks a MODE pin or external control for forced PWM. It automatically transitions between fixed-frequency PWM (moderate-to-heavy load) and pulse-skipping mode (light load), which may generate low-frequency beat notes under certain load/transient conditions.

What is the minimum output capacitance required for stability?

Stability is guaranteed with ≥22µF X5R/X7R ceramic output capacitance (ESR < 10mΩ). Using less than 15µF risks phase margin degradation and potential oscillation under dynamic load steps-confirmed by AC loop gain measurements in the datasheet's Typical Performance Characteristics section.

Can the EN pin be driven by a 3.3V GPIO without level shifting?

Yes. With VIH = 1.35V–1.8V and VIL < 1.2V, a standard 3.3V CMOS GPIO meets interface requirements directly. No level shifter is needed, and the 400mV hysteresis prevents chatter during slow-rising enable signals in noisy automotive environments.