Monolithic Power Systems Inc. MPQ4483GV-FD-AEC1-Z

Overview

MPQ4483GV-FD-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 3A synchronous step-down DC/DC converter with integrated USB BC 1.2 CDP/DCP mode support, ground short-to-battery protection, and spread-spectrum frequency modulation. It operates from 4.2V to 36V input, delivers adjustable 1V–20V output, and integrates 25mΩ/20mΩ MOSFETs for automotive USB charging ports requiring robust fault handling and EMI reduction.

For engineers reviewing the MPQ4483GV-FD-AEC1-Z datasheet, MPQ4483GV-FD-AEC1-Z pinout, MPQ4483GV-FD-AEC1-Z application in infotainment power rails, or MPQ4483GV-FD-AEC1-Z equivalent for USB-C compatible charging solutions, this device provides validated dual-level current limiting, programmable line-drop compensation, and battery-short-to-ground recovery-critical for OEM-grade automotive power design validation.

Technical Context

The MPQ4483GV-FD-AEC1-Z implements peak-current-mode control with a fixed-frequency oscillator (200kHz–2.2MHz) and internal frequency foldback above 1.2MHz at VIN >15V. Its dual-stage EN threshold (1V enable bias, 2V full operation) enables controlled startup under cold-crank conditions.

It integrates bidirectional USB 2.0 data switching with programmable DCP/CDP handshake via ILIM/MODE pin logic, and uses RGND–PGND sensing (4mΩ internal resistor) for precise ground-current–based constant-current regulation and short-to-battery detection-distinct from standard overcurrent protection.

Key Specifications

Pinout & Package

MPQ4483GV-FD-AEC1-Z is housed in a wettable-flank QFN-25 (4mm × 5mm) package optimized for automotive reflow inspection and thermal performance (θJA = 27°C/W on 4-layer EVB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive USB buck converter applications.

Compared with MPQ4483GV-AEC1-Z, the FD variant adds mandatory spread-spectrum for EMI-limited designs, while TI's TPS62130A-Q1 lacks both USB integration and ground-short resilience-making MPQ4483GV-FD-AEC1-Z the sole monolithic solution meeting full AEC-Q100 USB charging requirements.

Availability

MPQ4483GV-FD-AEC1-Z is available at Aetrix Electronics and suitable for automotive USB charging ports, infotainment system power rails, and telematics module supplies requiring stable component supply, AEC-Q100 qualification, and production-ready EMI compliance.

Supply support for MPQ4483GV-FD-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 analog and power ICs, with core expertise in DC/DC conversion, motor drivers, and automotive-grade power management.

The MPQ4483 product line targets automotive USB power delivery with integrated BC1.2 compliance, ground-fault resilience, and EMI-aware design-enabling compact, certified charging solutions without external USB ID or protection ICs.

FAQ

What distinguishes MPQ4483GV-FD-AEC1-Z from non-FD variants?

The "FD" suffix denotes integrated spread-spectrum frequency modulation with ±10% dither centered at the programmed frequency (e.g., 450kHz ±45kHz). This feature is absent in MPQ4483GV-AEC1-Z and reduces peak radiated emissions by >10dB, easing CISPR 25 Class 5 compliance without added filtering components.

How does ground short-to-battery protection operate during a fault?

When USB_GND is shorted to battery, the internal RGND–PGND current sense detects >12A surge, triggering immediate GATE pull-low (30–170Ω) to turn off the external low-side MOSFET. The IC enters hiccup mode with 2-second off-time, limiting average fault current to <100mA and preventing thermal damage to PCB traces or connectors.

Can MPQ4483GV-FD-AEC1-Z support USB-C PD negotiation?

No. It supports only USB Battery Charging Specification Rev 1.2 (BC1.2) modes: DCP (Apple Divider, 1.2V/1.2V), CDP, and standard SDP. It lacks USB-C physical layer, CC logic, or PD protocol stack - intended solely for legacy USB-A ports requiring 5V/2.4A–3A charging.

What is the role of the VDROP pin in line-drop compensation?

VDROP selects one of three gain levels (0.7/3.3/6.6 µA/A) for the internal current-to-voltage converter that injects correction current into the FB node. Pulling VDROP to GND, float, or VCC adjusts compensation amplitude linearly - e.g., 3A load × 3.3 µA/A × 40.2kΩ = ~398mV correction - ensuring stable voltage at the load end of long traces.

Is external bootstrap capacitor required for BST pin operation?

Yes. A 0.22µF X7R ceramic capacitor must be placed between BST and SW pins. This capacitor charges via internal VCC path during low-side conduction and supplies gate drive for the high-side MOSFET. Omitting it causes bootstrapping failure and immediate UVLO shutdown of the high-side driver.

Does MPQ4483GV-FD-AEC1-Z support pre-biased output startup?

Yes. When the output is pre-biased at power-on, the IC disables both high- and low-side switches until the internal soft-start capacitor voltage exceeds the FB voltage. This prevents reverse current flow and ensures monotonic startup without output voltage overshoot or inrush stress on downstream capacitors.

What thermal derating applies above 85°C ambient?

With θJA = 27°C/W on a 4-layer 50mm×50mm PCB, maximum continuous output current drops from 3A at 25°C to ~2.1A at 85°C ambient. Derating follows linear interpolation: IOUT = 3A × (1 − (TA − 25)/100), limited by 125°C max junction temperature and thermal shutdown at 165°C.