Monolithic Power Systems Inc. MPQ4272GVE-0000-AEC1-Z

Overview

MPQ4272GVE-0000-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 dual-channel synchronous buck converter IC for automotive USB Type-C power delivery, delivering up to 3A per channel across 4V–36V input and 1V–21V programmable output (12.6mV resolution), with I²C-configurable switching frequency (250/420/1100/2100 kHz), integrated 22mΩ/26mΩ MOSFETs, and VBUS isolation gate drivers.

For engineers reviewing the MPQ4272GVE-0000-AEC1-Z datasheet, MPQ4272GVE-0000-AEC1-Z pinout, MPQ4272GVE-0000-AEC1-Z application, or MPQ4272GVE-0000-AEC1-Z equivalent, this device supports USB PD 3.0 compliance, dual-port independent voltage/current control via PMBus-compatible I²C, thermal shutdown at 170°C, and battery short-to-ground protection - critical for automotive infotainment and ADAS power rail design.

Technical Context

The MPQ4272 employs peak-current-mode control with fixed-frequency PWM operation per channel, using two phase-shifted internal clocks to minimize input ripple. Each channel integrates high-side and low-side MOSFETs with 22mΩ and 26mΩ R_DS(ON), respectively, and features independent feedback loops with 0.1V reference accuracy (±2% at 5V output).

Its I²C interface enables real-time configuration of output voltage, current limit (50mA steps), switching frequency, spread-spectrum modulation, line-drop compensation, and phase delay. The BIAS pin supports efficiency optimization by enabling a secondary LDO powered from regulated output (≥4.8V), disabling the primary VIN-fed VCC regulator when active.

Key Specifications

Pinout & Package

MPQ4272GVE-0000-AEC1-Z is housed in a wettable-flank QFN-21 package (4mm × 5mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and thermal performance in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck automotive power delivery applications.

Compared with MPQ4272GVE-0000-AEC1-Z, the -0001 variant trades runtime configurability for faster boot and lower software overhead, while the -0011 variant reconfigures the internal control architecture for interleaved operation - making it unsuitable for independent dual-output applications despite identical packaging and pinout.

Availability

MPQ4272GVE-0000-AEC1-Z is available at Aetrix Electronics and suitable for automotive USB-C charging hubs, ADAS camera modules, infotainment system DC/DC supplies, and telematics control units requiring stable component supply with AEC-Q100 Grade 1 qualification and long-term automotive lifecycle support.

Supply support for MPQ4272GVE-0000-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 power management ICs, with over 20 years of expertise in DC/DC conversion, motor drivers, and automotive-grade solutions.

The MPQ4272 belongs to MPS's AEC-Q100-compliant automotive power delivery product line, engineered specifically for USB Type-C PD applications in vehicles - emphasizing robustness under wide temperature, voltage transients, and EMI constraints.

FAQ

What is the purpose of the BIAS pin, and how should it be connected?

The BIAS pin enables a secondary LDO powered from a regulated output rail (≥4.8V) to replace the primary VIN-fed VCC regulator, reducing quiescent current by ~30%. Connect BIAS directly to a stable 5V or 9V output via an RC low-pass filter (e.g., 10kΩ + 100nF) to suppress noise; if unused, tie to GND.

How does the I²C interface support USB PD 3.0 compliance?

The I²C interface implements PMBus-compatible commands (VOUT_COMMAND, IOUT_OC_FAULT_LIMIT, OPERATION) to dynamically configure output voltage (1V–21V), current limit (50mA steps), and fault responses - satisfying USB PD 3.0 specification requirements for programmable power supply negotiation and monitoring without external microcontroller intervention.

Can MPQ4272GVE-0000-AEC1-Z operate with only one channel enabled?

Yes - either channel can be independently disabled via I²C (OPERATION command) or hardware (pulling EN low). When one channel is disabled, the other maintains full 3A capability, and the disabled channel's FB, SW, and BST pins enter high-impedance state to prevent shoot-through or leakage paths.

What thermal performance can be expected in a typical automotive PCB layout?

On a 4-layer 55mm×55mm evaluation board (EVQ4272-VE-00A), case temperature rise is ≤25°C at 3A per channel (6A total) with 12V input and 5V output at 420kHz. With proper thermal vias under the exposed pad and 2oz copper, junction-to-ambient θ_JA is 44°C/W, supporting continuous operation up to +125°C ambient.

How does the load-shedding alert (ALT pin) function during fault conditions?

The ALT pin is an open-drain output that pulls low during OVP, TSD, or OCP events. It asserts within 1μs of fault detection and remains low until cleared via I²C (CLEAR_FAULTS command) or power-cycle - enabling immediate host MCU interrupt handling and coordinated system-level shutdown before thermal damage occurs.

Is external compensation required for stable loop operation?

No - the MPQ4272 integrates an optimized internal compensation network for standard 4.7μH inductors and 100μF output capacitance. External compensation is unnecessary unless using non-standard LC values or demanding ultra-fast transient response; in those cases, refer to MPS AN-101 for optional RC network guidance.

What is the minimum off-time limitation, and why does it matter?

The minimum off-time is 100ns - a hard silicon limit that constrains maximum duty cycle at high switching frequencies. At 2.1MHz, this limits D_MAX to ~95%, preventing 36V→33V conversion; for such high-VIN/low-VOUT ratios, use 250kHz or 420kHz to achieve 99% dropout-mode operation.