Monolithic Power Systems Inc. MPQ4462DN-AEC1-LF-Z

Overview

MPQ4462DN-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, asynchronous 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 and adjustable 0.8V–30V output voltage. It operates at up to 4MHz switching frequency with programmable frequency scaling, 120µA quiescent current, and internal soft-start-designed for automotive power rails including infotainment, ADAS camera modules, and body control units.

For engineers reviewing the MPQ4462DN-AEC1-LF-Z datasheet, MPQ4462DN-AEC1-LF-Z pinout, MPQ4462DN-AEC1-LF-Z application, or MPQ4462DN-AEC1-LF-Z equivalent, key selection criteria include its AEC-Q100 qualification, SOIC8E package thermal performance (θJA = 50°C/W), 100ns minimum off-time for high-duty-cycle operation, and bootstrap charging behavior under light-load pulse-skipping conditions.

Technical Context

The MPQ4462DN-AEC1-LF-Z employs peak-current-mode control with an internal error amplifier (200V/V gain, 60µA/V transconductance) and a dedicated COMP pin for loop compensation. Its oscillator frequency is set externally via a resistor on the FREQ pin, supporting precise tuning from 0.2MHz to 4MHz.

It integrates a floating high-side gate driver powered by a bootstrap capacitor charged during the low-side conduction phase, with UVLO protection (2.2V rising, 0.15V falling) and internal thermal shutdown (150°C trip, 135°C hysteresis). The device uses asynchronous rectification with external Schottky diode and supports stable operation with ceramic output capacitors.

Key Specifications

Pinout & Package

MPQ4462DN-AEC1-LF-Z is housed in an SOIC8E (Small Outline Integrated Circuit, 8-lead, exposed pad) package with 1.27mm pitch and thermally enhanced exposed ground pad. The package supports standard reflow profiles and provides θJA = 50°C/W and θJC = 10°C/W on a 4-layer PCB per JESD51-7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4462DN-AEC1-LF-Z, the QFN variant offers better thermal dissipation in dense layouts, while the LM61480-Q1 trades programmability and ultra-low IQ for higher current and simpler BOM-but cannot match the 4MHz EMI-shaping capability or 120µA standby performance.

Availability

MPQ4462DN-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment processors, and body control units requiring stable component supply with AEC-Q100 traceability and long-term production continuity.

Supply support for MPQ4462DN-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 LED lighting controllers.

The MPQ4462 belongs to MPS's automotive-qualified buck converter product line, engineered specifically for harsh-environment power delivery in vehicles-emphasizing wide VIN range, low IQ, AEC-Q100 reliability, and EMI robustness.

FAQ

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

The MPQ4462DN-AEC1-LF-Z supports 4MHz switching only up to 12V input per Figure 2 in the datasheet; above 12V, frequency must be reduced to ≤2MHz to ensure sufficient minimum on-time (80ns) and stable bootstrap charging. At 24V input, max recommended frequency is 2MHz.

Does this part require an external Schottky diode, and what specs are critical?

Yes-an external Schottky diode is mandatory for asynchronous operation. Critical specs: reverse voltage rating >36V (e.g., 40V), forward current rating ≥3.5A, and low forward voltage (<0.45V at 3.5A) to minimize conduction loss and thermal stress on the IC.

How does the internal current limit behave under short-circuit conditions?

Under short-circuit, the MPQ4462DN-AEC1-LF-Z enters hiccup mode after ~500ms: it shuts down for ~20ms, then attempts restart. This protects the MOSFET and diode from thermal runaway while allowing automatic recovery once fault clears-no latch-up or manual reset required.

Can the FB pin be used for remote sensing, and what layout precautions apply?

No-the FB pin is not designed for Kelvin sensing; it has high impedance but lacks dedicated remote-sense inputs. For accurate regulation, place the feedback resistors within 3mm of the FB pin and route the FB trace away from SW, inductors, and noisy power planes using guard traces tied to GND.

Is the SOIC8E package RoHS-compliant and lead-free?

Yes-MPQ4462DN-AEC1-LF-Z carries the "LF" suffix indicating lead-free, RoHS-compliant packaging per EU Directive 2011/65/EU and MPS green status documentation, with matte tin (Sn) lead finish and halogen-free molding compound.

What happens to BST voltage during light-load pulse-skipping mode?

During pulse-skipping, BST voltage may decay due to insufficient charge time. To maintain gate drive, ensure VIN – VOUT > 3V (e.g., VIN ≥ 6.3V for 3.3V output); alternatively, use EN pin to raise UVLO threshold to VOUT + 3V, preventing dropout during low-duty cycles.

How is thermal performance affected by the exposed pad connection in SOIC8E?

The SOIC8E's exposed pad must be soldered to a solid GND copper pour with ≥6 thermal vias (15mil barrel, 40mil pitch) to achieve rated θJA = 50°C/W. Omitting the pad connection degrades thermal resistance by >25°C/W and risks thermal shutdown at >2A load.