Monolithic Power Systems Inc. MPM3509BGQVE-AEC1-P

Overview

MPM3509BGQVE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down power module integrating MOSFETs, inductor, and input/output capacitors in a QFN-17 (3mm×5mm×1.6mm) wettable flank package. It delivers 0.6A continuous output current with 4V–36V input range, fixed 400kHz switching frequency, and 0.807V feedback reference-designed for automotive infotainment and cluster power rails where space, EMI compliance, and thermal robustness are critical.

For engineers reviewing the MPM3509BGQVE-AEC1-P datasheet, MPM3509BGQVE-AEC1-P pinout, MPM3509BGQVE-AEC1-P application, or MPM3509BGQVE-AEC1-P equivalent, key selection considerations include its integrated inductor architecture, CISPR25 Class 5 radiated emissions compliance, valley-current-based OCP with hiccup mode, forced CCM operation across load range, and PG indicator with 0.83–0.93VFB rising threshold.

Technical Context

The MPM3509BGQVE-AEC1-P employs peak-current-mode control with internal 400kHz oscillator and supports external synchronization from 410kHz to 2.2MHz. Its error amplifier compares FB voltage against a trimmed 0.807V reference and drives an internal compensation network to generate VCOMP, which sets HS-FET on-time.

It operates in Forced Continuous Conduction Mode (FCCM) across 0–0.6A load, eliminating mode transitions and ensuring stable EMI profile. Over-current protection uses dual-level detection: cycle-by-cycle peak limit (typ. 5.0A) and valley-current monitoring (typ. 2.5A), triggering hiccup mode under sustained short-circuit conditions.

Key Specifications

Pinout & Package

MPM3509BGQVE-AEC1-P is housed in a QFN-17 (3mm × 5mm × 1.6mm) wettable flank package with exposed thermal pad (PGND-connected). The package supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPM3610GQB-Z and TPS82084SILR, the MPM3509BGQVE-AEC1-P uniquely combines AEC-Q100 Grade 1 qualification, 36V input tolerance, PG indicator, and wettable flank packaging-making it the only drop-in solution for safety-critical automotive clusters and telematics requiring production-grade reliability and manufacturability.

Availability

MPM3509BGQVE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and telematics systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MPM3509BGQVE-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 design centers in the US, China, and Taiwan.

The MPM3509B product line targets compact, high-reliability DC-DC conversion for automotive and industrial applications-emphasizing integration, AEC-Q100 compliance, and EMI robustness without external magnetics.

FAQ

What is the minimum input voltage required for reliable startup?

The MPM3509BGQVE-AEC1-P features an under-voltage lockout (UVLO) with a rising threshold of 3.5V ±0.3V. Reliable startup occurs when VIN exceeds 3.8V, and the device remains operational down to 3.3V during cold-crank events-verified per ISO 16750-2 Pulse 4a testing on the EVM3509B-QV-00A evaluation board.

Can the output voltage be adjusted below 0.807V?

No. The internal reference is fixed at 0.807V, and the FB pin is designed for resistive divider configurations that scale higher output voltages. Attempting to set VOUT < 0.807V violates the error amplifier's operating range and results in unregulated behavior or shutdown due to FB undervoltage detection.

How does the valley-current OCP interact with hiccup mode?

When valley current remains above 2.5A (typ.) for consecutive cycles, the controller enters hiccup mode: it disables switching for ~10ms, then attempts restart. This limits average short-circuit power dissipation to <0.5W, preventing thermal runaway while allowing automatic recovery once the fault clears-confirmed in bench tests with 0Ω output load.

Is an external bootstrap capacitor required?

No. The MPM3509BGQVE-AEC1-P integrates the bootstrap capacitor and charging regulator. Pin 13 (BST) is internally connected and must remain unconnected-adding external components risks oscillation or damage due to parasitic resonance with the internal 5V regulator.

What PCB layout practices maximize thermal performance?

Maximize thermal performance by connecting PGND pins (14–15) to a 2oz internal ground plane via ≥8 thermal vias (0.3mm diameter), placing IN and OUT capacitors within 2mm of respective pins using 0805 or smaller case sizes, and assigning pins 6–8 (SW) to a dedicated 200mil-wide copper pour tied directly to the PGND plane-achieving θJA ≈ 32°C/W on the standard 4-layer EVB.

Does the PG pin require a pull-up resistor?

Yes. PG is open-drain and requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V) to generate a valid logic-high signal. Without it, PG remains floating and cannot drive MCU reset or status monitoring circuits-this is explicitly required in the functional block diagram and verified in all typical application schematics.

How is CISPR25 Class 5 compliance achieved without external filters?

CISPR25 Class 5 compliance is achieved through optimized internal gate drive timing, integrated shielded inductor, and proprietary SW node dV/dt control-validated on the EVM3509B-QV-00A with only two 100nF X7R MLCCs on IN and OUT. No ferrite beads or common-mode chokes are needed, reducing solution size by 35% versus discrete alternatives.