Monolithic Power Systems Inc. MPQ4320CGLE-AEC1-P

Overview

MPQ4320CGLE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter optimized for automotive power rails. It delivers up to 0.5A output current with 3.3V–36V input range, 42V load dump tolerance, 1μA shutdown current, and configurable 350kHz–2.5MHz switching frequency - enabling compact, thermally robust designs in infotainment and ADAS ECUs.

For engineers reviewing the MPQ4320CGLE-AEC1-P datasheet, MPQ4320CGLE-AEC1-P pinout, MPQ4320CGLE-AEC1-P application, or MPQ4320CGLE-AEC1-P equivalent, key selection criteria include cold-crank support (3.1V VIN min), integrated 70mΩ HS/50mΩ LS MOSFETs, wettable-flank QFN-12 (3mm×4mm) package, CISPR25 Class 5 EMI compliance, and LDO-mode operation during low-input conditions.

Technical Context

The MPQ4320CGLE-AEC1-P employs peak current mode control with frequency foldback at startup to prevent inductor current runaway. Its dual-VIN pin architecture minimizes switching noise coupling, while symmetric VIN pinout and Frequency Spread Spectrum (FSS) modulation reduce conducted and radiated EMI.

It integrates high-side and low-side MOSFETs with 65ns minimum on-time and 50ns minimum off-time, supporting high duty cycle operation down to 3.1V input for automotive cold-crank. Thermal shutdown (160°C–185°C) and hiccup-mode over-current protection ensure fault resilience in harsh environments.

Key Specifications

Pinout & Package

MPQ4320CGLE-AEC1-P uses a 12-pin QFN package (3mm × 4mm) with wettable flanks and exposed thermal pad. Pin numbering follows standard top-view orientation with pins 1–6 on top row (left-to-right), 7–12 on bottom row (right-to-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4320CGLE-AEC1-P, the CGDE variant trades thermal performance for footprint reduction, while the LM61480-Q1 offers higher current at the expense of added system-level protection components and reduced transient robustness.

Availability

MPQ4320CGLE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera systems, and instrument cluster designs requiring stable component supply with AEC-Q100 qualification and full production traceability.

Supply support for MPQ4320CGLE-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, with over two decades of leadership in DC/DC conversion, motor drivers, and automotive-grade solutions.

The MPQ4320C product line targets automotive subsystems demanding high reliability, ultra-low quiescent current, and robust transient immunity - specifically engineered for infotainment, clusters, and ADAS power rails operating across -40°C to +150°C.

FAQ

What is the maximum allowable input voltage for MPQ4320CGLE-AEC1-P during load dump events?

The device is rated for 42V absolute maximum input voltage per ISO 16750-2 Pulse 5a, meaning it can withstand transient spikes up to 42V without damage or functional interruption. This eliminates the need for external TVS diodes in most automotive front-end designs, provided layout adheres to MPS recommended grounding and decoupling practices.

Does MPQ4320CGLE-AEC1-P support adjustable output voltage?

Yes - the MPQ4320CGLE-AEC1-P supports both fixed-output versions (e.g., 3.3V, 5V) and adjustable operation. For adjustable mode, connect the FB pin to the center tap of a resistor divider from VOUT to AGND; output voltage is calculated as VOUT = 0.8V × (1 + R1/R2), with 0.8V being the precise internal reference voltage.

How does the FREQ pin configure switching frequency?

The FREQ pin sets switching frequency by connecting an external resistor (RFREQ) from FREQ to AGND. Typical values are 86.6kΩ for 415kHz, 34.8kΩ for 1MHz, and 15kΩ for 2.2MHz. The relationship is approximately linear in log scale, and RFREQ tolerance directly impacts fSW accuracy - ±1% resistor yields ±1.5% fSW variation.

Is thermal derating required for continuous 0.5A operation at 36V input?

At 36V input and 5V output, power dissipation reaches ~15.5W × (1 − 5/36) ≈ 13.2W peak, exceeding the 3.6W continuous rating for the QFN-12 (3mm×4mm) package. Derating is mandatory: full 0.5A is only sustainable below ~18V VIN unless PCB thermal design achieves θJA ≤ 25°C/W via 2oz copper, thermal vias, and heatsink attachment.

What is the purpose of the dual VIN pins (pins 2 and 10)?

Pins 2 and 10 are internally connected VIN inputs designed to reduce high-frequency impedance and improve EMI performance. Each pin must be decoupled independently with a 1µF ceramic capacitor to PGND, placed as close as possible to the pin. This dual-path layout minimizes ground bounce and stabilizes the input rail during high di/dt switching transitions.

Can the PG pin drive a microcontroller GPIO directly?

Yes - the open-drain PG pin can interface directly with 3.3V or 5V logic inputs when pulled up to the same rail as the monitored VOUT. A 10kΩ pull-up resistor is typical. PG asserts high when VOUT is within 94.5%–105.5% of nominal value and pulls low for out-of-regulation conditions, enabling reliable power sequencing without level-shifting circuitry.

Does MPQ4320CGLE-AEC1-P require external bootstrap capacitor?

Yes - a 0.1µF X7R ceramic capacitor must be placed between BOOT and SW pins. This capacitor supplies gate drive energy to the high-side MOSFET during its on-time. Placement must be adjacent to the IC with minimal trace length to avoid ringing and ensure reliable HS-FET turn-on, especially at high duty cycles (>90%) or high switching frequencies.