Monolithic Power Systems Inc. MPM3551CGQWE-AEC1-P

Overview

MPM3551CGQWE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, fully integrated synchronous step-down power module with built-in 1µH inductor and MOSFETs, delivering up to 3A continuous output current across a 3.3V–36V input range, featuring 2.2MHz fixed switching frequency, 42V load dump tolerance, and 1µA shutdown quiescent current - deployed in automotive infotainment and ADAS domain controllers.

For engineers reviewing the MPM3551CGQWE-AEC1-P datasheet, MPM3551CGQWE-AEC1-P pinout, MPM3551CGQWE-AEC1-P application, or MPM3551CGQWE-AEC1-P equivalent, key selection criteria include cold-crank operation down to 3.1V VIN, ±1.5% PG threshold accuracy over temperature, integrated FSS for CISPR25 Class 5 EMI compliance, and QFN-20 wettable flank package for automated optical inspection.

Technical Context

The MPM3551CGQWE-AEC1-P implements a current-mode controlled synchronous buck architecture with integrated 70mΩ HS-FET and 50mΩ LS-FET, enabling high-efficiency regulation under automotive transients. Its 65ns minimum on-time supports high step-down ratios at 2.2MHz, while frequency spread spectrum (±10%) and symmetric VIN pinout suppress conducted and radiated emissions.

Thermal management is enhanced by MeshConnect™ flip-chip packaging and dual thermal paths (θJC = 6.1°C/W), supporting continuous 3A operation at TJ ≤ 150°C. The device enters low-dropout (LDO) mode during cold-crank conditions and features hiccup-mode over-current protection with 4.3A–7.6A adjustable HS peak limit.

Key Specifications

Pinout & Package

MPM3551CGQWE-AEC1-P is housed in a thermally enhanced QFN-20 (4mm × 6mm) package with wettable flanks for solder joint inspection. The package integrates a 1µH power inductor and features dual VIN and PGND pins for low-impedance power routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS628502RTWR and MAX20004AATP+T, the MPM3551CGQWE-AEC1-P uniquely combines AEC-Q100 Grade 1 qualification, 42V load dump survival, CISPR25 Class 5 compliance out-of-box, and wettable flank packaging - making it the only drop-in solution for space-constrained, safety-aware automotive power rails requiring zero-additional-filtering design.

Availability

MPM3551CGQWE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera systems, and instrument cluster designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for MPM3551CGQWE-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 power management ICs and modules, with over two decades of expertise in automotive, industrial, and computing power solutions.

The MPM3551C product line delivers fully integrated, AEC-Q100-qualified DC-DC modules targeting space-constrained automotive subsystems where reliability, EMI performance, and transient robustness are non-negotiable.

FAQ

What is the minimum input voltage required to start up the MPM3551CGQWE-AEC1-P?

The device starts up when VIN rises above 3.65V (typical UVLO rising threshold). After startup, it sustains regulation down to 3.1V VIN in low-dropout mode - validated for automotive cold-crank conditions per ISO 16750-2.

Does the MPM3551CGQWE-AEC1-P require an external feedback resistor divider?

Only for adjustable-output versions. The MPM3551CGQWE-AEC1-P is a fixed-output variant (3.3V, per ordering code suffix); its FB pin is internally connected to OUT, eliminating external resistors and improving accuracy and stability.

How does the power good (PG) signal behave during output overvoltage or undervoltage faults?

PG goes low when VOUT falls below 93% or exceeds 107% of nominal voltage. It remains low until VOUT returns within the 94.5–105.5% window and stays asserted for ≥70µs (rising deglitch) to prevent false triggering during transients.

Can the MPM3551CGQWE-AEC1-P operate without the VCC bypass capacitor?

No. A minimum 1µF ceramic capacitor must be placed directly between VCC and PGND. Omitting it causes instability in the internal bias regulator, leading to erratic EN response, PG glitches, and potential startup failure.

What is the purpose of the NC pins (4, 13, 16) on the QFN-20 package?

Pins 4, 13, and 16 are not internally connected and may be left floating or used for PCB routing. They serve no electrical function and must not be tied to any voltage or ground - doing so risks internal latch-up or parametric shift.

Is the integrated inductor rated for continuous 3A operation at 150°C junction temperature?

Yes. The integrated 1µH inductor is characterized for ≥6.5A saturation current and ≤36mΩ DCR at +125°C ambient. Thermal testing confirms stable 3A output at TJ = 150°C on standard 4-layer evaluation board per datasheet Figure 31.

How does frequency spread spectrum (FSS) improve EMI performance in this module?

FSS modulates switching frequency by ±10% at 15kHz, spreading energy across a 200kHz bandwidth instead of concentrating at 2.2MHz harmonics. This reduces peak conducted/radiated emissions by 5–10dB, enabling CISPR25 Class 5 compliance without ferrite beads or common-mode chokes.