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

Overview

MPQ2451GG-33-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 36V-input, 2.2MHz synchronous step-down DC/DC 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, precision cycle-by-cycle current limit (0.65–1A), and 130µA quiescent current-designed for automotive body electronics, infotainment power rails, and ADAS sensor modules.

For engineers reviewing the MPQ2451GG-33-AEC1-Z datasheet, MPQ2451GG-33-AEC1-Z pinout, MPQ2451GG-33-AEC1-Z application, or MPQ2451GG-33-AEC1-Z equivalent, this device offers verified AEC-Q100 compliance, QFN-6L thermal performance (θJA = 80°C/W), and validated pulse-skipping efficiency optimization across 3.3V–36V input range-critical for low-power automotive subsystems requiring stable 3.3V logic supply under cold-crank conditions.

Technical Context

The MPQ2451GG-33-AEC1-Z implements fixed-frequency peak-current-mode PWM control with 2.2MHz switching and internal compensation, eliminating external loop components. Its bootstrap-driven high-side gate driver supports duty cycles up to ~90% when VIN−VOUT > 3V, enabling efficient 3.3V generation from 12V or 24V automotive batteries.

Thermal shutdown (150°C) and under-voltage lockout (UVLO rising threshold 2.9V, hysteresis 0.4V) ensure robust operation during battery transients. The dedicated EN pin provides precise enable control (VIH = 1.35–1.8V), while the COMP pin enables external loop tuning if required-though internal compensation is fully functional out-of-box.

Key Specifications

Pinout & Package

MPQ2451GG-33-AEC1-Z is housed in a thermally enhanced 2mm × 2mm QFN-6L package with exposed thermal pad (pin 1 ID marked). The package delivers θJA = 80°C/W on 4-layer PCB per JESD51-7, supporting 1.56W continuous power dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62130AQRGTRQ1 and LM61480QRNXTQ1, MPQ2451GG-33-AEC1-Z provides optimal balance of AEC-Q100 compliance, 3.3–36V input coverage, fixed 3.3V output, and minimal external component count-reducing design risk and validation effort for cost-sensitive 0.6A automotive rails.

Availability

MPQ2451GG-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and infotainment power management requiring stable component supply under AEC-Q100 lifecycle constraints.

Supply support for MPQ2451GG-33-AEC1-Z 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.

The MPQ2451 product line targets automotive-grade DC/DC conversion, emphasizing AEC-Q100 qualification, wide input range, and minimal external components for body electronics and safety-critical subsystems.

FAQ

What is the maximum allowable input voltage for MPQ2451GG-33-AEC1-Z?

The absolute maximum input voltage is +40V, but the recommended operating range is 3.3V to 36V per AEC-Q100 test conditions. Operation at 36V is validated for load-dump immunity, while sustained operation above 36V risks permanent damage to the integrated MOSFET and internal regulator.

Does MPQ2451GG-33-AEC1-Z require an external bootstrap diode?

No external bootstrap diode is required under normal operation. The internal bootstrap regulator charges the BST capacitor from VIN to SW. However, an external diode (e.g., BAT54) is recommended when VIN ≤ 6V or duty cycle exceeds 65% to ensure sufficient gate drive voltage during high-duty operation.

Can MPQ2451GG-33-AEC1-Z operate with ceramic output capacitors only?

Yes-it is explicitly designed for stability with ceramic output capacitors. The internal compensation network eliminates ESR dependency, allowing use of X5R/X7R MLCCs without added series resistance. This reduces board area, improves reliability, and avoids tantalum capacitor aging concerns.

What is the thermal performance difference between SOT23-6L and QFN-6L packages?

The QFN-6L package has θJA = 80°C/W versus 220°C/W for SOT23-6L on identical 4-layer PCBs. This translates to ~2× higher continuous power handling (1.56W vs. 0.57W at 25°C ambient) and lower junction temperature rise-critical for automotive under-hood applications where ambient exceeds 85°C.

How does the current limit behave across temperature?

The cycle-by-cycle current limit is specified as 0.65–1A over −40°C to +125°C junction temperature. At 25°C it is typically 0.75–1A, decreasing slightly at extremes to maintain MOSFET SOA. This internal limit replaces external sense resistors and remains accurate without calibration.

Is the EN pin internally pulled down when floating?

Yes-the EN pin has an internal pull-down to GND, ensuring default disable state when unconnected. Pulling EN above 1.35V enables operation; pulling below 1.2V disables it. This allows safe power-up sequencing without external biasing circuitry.

What is the minimum inductor value recommended for 2.2MHz operation?

A 2.2µH inductor is recommended per MPS EVQ2451-G-33 reference design. Lower values increase ripple current and reduce efficiency; higher values (e.g., 3.3–4.7µH) improve ripple suppression but may compromise transient response. All values must sustain ≥0.9A peak current to avoid saturation.