Monolithic Power Systems Inc. MPM3515GQV-P

Overview

MPM3515GQV-P from Monolithic Power Systems is a fully integrated, AEC-Q100 Grade 1 qualified synchronous step-down DC/DC power module with built-in MOSFETs, inductor, and input/output capacitors. It delivers 1.5A continuous output current from a 4V–36V input, operates at 2.2MHz fixed switching frequency, and features Power Good (PG) indication, valley-current OCP, thermal shutdown, and CISPR25 Class 5 EMI compliance - deployed in automotive ADAS camera modules requiring compact, robust 3.3V/1.5A rail generation.

For engineers reviewing the MPM3515GQV-P datasheet, MPM3515GQV-P pinout, MPM3515GQV-P application, or MPM3515GQV-P equivalent, key selection criteria include its QFN-17 wettable flank package, 0.8V adjustable output, forced CCM operation across load range, frequency sync capability (450kHz–2.2MHz), and integrated bootstrap capacitor eliminating external BST diode requirements in most designs.

Technical Context

The MPM3515GQV-P implements peak-current-mode control with internal 0.807V reference and optimized compensation network, enabling stable regulation without external loop components. Its valley-current detection OCP and hiccup-mode short-circuit protection operate independently of external feedback, ensuring fault resilience during output shorts.

It integrates a 4.8V internal LDO (VCC) powered directly from VIN, with no external capacitor required, and uses an internal bootstrap regulator to charge the floating gate driver - eliminating need for external BST capacitor or diode under typical duty cycles (e.g., 3.3V out from 12V in).

Key Specifications

Pinout & Package

MPM3515GQV-P is housed in a space-saving QFN-17 (3mm × 5mm × 1.6mm) wettable flank package with exposed thermal pad on underside for enhanced PCB heat dissipation. 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 module applications.

Compared with RECOM R-78E5.0-1.5 and TI TPSM84203, the MPM3515GQV-P uniquely combines AEC-Q100 Grade 1, wettable flank QFN, CISPR25 Class 5 compliance, and zero-external-BST operation - making it optimal for space-constrained, safety-critical automotive and industrial designs where supply chain traceability and AOI capability are mandatory.

Availability

MPM3515GQV-P is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC I/O cards, medical imaging sensor nodes, and telecom remote radio units requiring stable component supply with full AEC-Q100 documentation and lot-level traceability.

Supply support for MPM3515GQV-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 integrated power modules and DC/DC conversion technology.

The MPM3515 product line targets compact, high-reliability power delivery in automotive, industrial, and medical applications - designed to replace discrete buck solutions with minimal layout effort while meeting stringent functional safety and EMC requirements.

FAQ

What is the maximum recommended PCB temperature rise for reliable operation of MPM3515GQV-P?

The device is rated for junction temperature up to 125°C under continuous operation. With θJA = 46°C/W on a 4-layer board, maintaining ≤25°C PCB temperature rise above ambient (e.g., 2 oz copper, 200 mm² thermal pad, 6+ vias) ensures safe operation at full 1.5A load across −40°C to +85°C ambient.

Can MPM3515GQV-P operate with input voltage below 4V?

No - the absolute minimum operating input voltage is 4V per datasheet specifications. Below this, UVLO prevents startup and regulation. The under-voltage lockout rising threshold is 3.5V ±0.3V, and hysteresis is 330mV, so operation below 4V is not supported or characterized.

Is an external bootstrap diode required for 5V output from 12V input?

No - the internal bootstrap regulator and integrated capacitor eliminate need for external BST diode at duty cycles ≤65%. For 5V out from 12V in (D ≈ 42%), external diode is unnecessary. Only required if VOUT ≥ 5V and VIN/VOUT > 1.53 (e.g., 5V out from 8V in).

How does the frequency foldback feature affect EMI performance at high input voltage?

At VIN > ~21V, foldback reduces switching frequency from 2.2MHz to 1.1MHz - shifting fundamental harmonics downward and reducing high-frequency radiated emissions. This complements CISPR25 Class 5 compliance by lowering energy in 30–1000MHz band where antenna coupling is strongest.

What is the purpose of the NC pin (Pin 17), and can it be grounded?

Pin 17 is a true no-connect with no internal bond wire or circuitry. It must remain unconnected and floating - grounding or routing it risks mechanical stress on die attach or contamination during assembly. MPS explicitly states "NC must be left floating" in the datasheet.

Does the PG pin require an external pull-up resistor, and what value is recommended?

Yes - PG is open-drain and requires external pull-up. A 10kΩ resistor to 3.3V or 5V is typical. With 4mA sink capability and 0.4V max drop at 4mA, this ensures clean logic-high signaling (>2.9V) while limiting current to <0.5mA during active-low assertion.

How does the internal soft-start time impact system boot timing in automotive applications?

The fixed 1.7ms soft-start (typical) ramps output voltage linearly from 10% to 90%, preventing inrush current into downstream capacitance and avoiding brown-out resets in microcontrollers. This aligns with automotive cold-crank timing requirements and eliminates need for external SS capacitor tuning.