Monolithic Power Systems Inc. MPQ4462DQ-AEC1-LF-Z

Overview

MPQ4462DQ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, delivering up to 3.5A output current across a 3.8V–36V input range, programmable switching frequency up to 4MHz, and 120µA quiescent current - designed for automotive infotainment power rails and ADAS domain controllers.

For engineers reviewing the MPQ4462DQ-AEC1-LF-Z datasheet, MPQ4462DQ-AEC1-LF-Z pinout, MPQ4462DQ-AEC1-LF-Z application, or MPQ4462DQ-AEC1-LF-Z equivalent, key selection criteria include its AEC-Q100 qualification, 4MHz high-frequency operation for EMI-sensitive AM radio bands, internal current-limiting without sense resistor, and QFN10 (3mm×3mm) thermally enhanced package with exposed ground pad.

Technical Context

The MPQ4462DQ-AEC1-LF-Z implements current-mode control with cycle-by-cycle peak-current limiting and internal soft-start, enabling fast transient response and stable regulation under wide load and input variations. Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from 0.2MHz to 4MHz, with frequency foldback during startup to prevent inductor current runaway.

It features an integrated 2.6V internal regulator powering all control circuitry across the full VIN range, a dedicated EN pin with 300mV hysteresis (1.2V falling / 1.5V rising), and bootstrap-driven high-side gate driver requiring external BST–SW capacitor; thermal shutdown activates at 150°C with 15°C hysteresis for fault-tolerant operation.

Key Specifications

Pinout & Package

MPQ4462DQ-AEC1-LF-Z is housed in a thermally optimized 3mm×3mm QFN-10 package with exposed ground pad, supporting high-power density and efficient heat dissipation in space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480-Q1 and TPS54560-Q1, MPQ4462DQ-AEC1-LF-Z offers superior EMI control via 4MHz programmability and lower quiescent current, while maintaining AEC-Q100 Grade 1 operation at full 125°C junction temperature - making it optimal for space-constrained, RF-sensitive automotive modules.

Availability

MPQ4462DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment power, ADAS camera module supply, and body control module (BCM) applications requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ4462DQ-AEC1-LF-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 analog and power ICs, with over two decades of leadership in DC/DC conversion, motor drivers, and automotive-grade power solutions.

The MPQ4462 product line delivers high-frequency, AEC-Q100 qualified buck converters targeting next-generation automotive electronics where EMI, thermal density, and battery efficiency are critical constraints.

FAQ

What is the maximum recommended input voltage for reliable 4MHz operation?

The MPQ4462DQ-AEC1-LF-Z supports 4MHz switching only when VIN ≤12V, as specified in Figure 2 of the datasheet. At higher input voltages, minimum on-time limitations cause pulse-skipping and reduced regulation accuracy; for 24V input, maximum recommended frequency is 2MHz.

Does this part require an external bootstrap diode?

An external bootstrap diode is recommended when VIN ≤5V, duty cycle exceeds 65%, or operating at >2MHz - to ensure sufficient BST capacitor charging. The IN4148 or BAT54 is suitable; placement must minimize trace inductance between BST, SW, and diode cathode.

How is output voltage adjusted, and what is the feedback reference accuracy?

VOUT is set using a resistor divider from output to FB pin, referenced to 0.792V (typ.) with ±1.3% tolerance (0.773V–0.812V) over temperature. For 3.3V output, use R2 = 40.2kΩ and R1 = 127kΩ; R2 ≤40kΩ ensures stable biasing under light-load BST leakage.

Can MPQ4462DQ-AEC1-LF-Z operate in pulse-skipping mode at light load?

Yes - it automatically enters pulse-skipping mode below ~100mA load to maintain regulation while minimizing switching losses. This reduces quiescent current to 120µA but may increase output voltage ripple; for ultra-low-noise applications, forced PWM mode is not supported.

What thermal vias configuration is required for the exposed pad?

The exposed pad must connect to a solid GND plane using ≥9 thermal vias (15mil barrel diameter, 40mil pitch), arranged in a 3×3 grid centered under the pad. This achieves θJA ≈ 50°C/W on a 4-layer PCB per JESD51-7, preventing thermal shutdown at 3.5A continuous load.

Is the current limit adjustable, and how is it implemented?

No - the current limit is fixed internally at 4.0–5.5A (typ. 5.0A) and requires no external components. It is derived from the MOSFET's RDS(ON) and COMP voltage threshold, eliminating the need for a sense resistor and associated power loss or layout sensitivity.

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

Minimum off-time is 100ns - critical for maintaining regulation at high duty cycles (e.g., VOUT/VIN > 0.9). If off-time falls below this value, the controller cannot turn off the high-side switch, risking shoot-through or overcurrent; design must ensure fSW × (1−D) ≥ 100ns.