Monolithic Power Systems Inc. MPQ4488BGU-FD-AEC1-Z

Overview

MPQ4488BGU-FD-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter with integrated dual USB charging ports, delivering up to 6A buck output and 3A per USB port. It supports BC1.2, Apple 3A Divider, 1.2V/1.2V, and USB Type-C 5V@3A DFP modes, features programmable 250kHz–2.2MHz switching frequency, ±10% spread spectrum (based on 420kHz), and 18mΩ/15mΩ internal high-side/low-side MOSFETs. Used in automotive infotainment and telematics power systems requiring robust USB charging compliance.

For engineers reviewing the MPQ4488BGU-FD-AEC1-Z datasheet, MPQ4488BGU-FD-AEC1-Z pinout, MPQ4488BGU-FD-AEC1-Z application, or MPQ4488BGU-FD-AEC1-Z equivalent, key selection criteria include AEC-Q100 qualification, dual-USB Type-C/Type-A auto-detection capability, spread-spectrum EMI reduction, load-shedding at +135°C, and precise 5.1V/5.17V/5.3V output voltage selection via OUT_SEL.

Technical Context

The MPQ4488BGU-FD-AEC1-Z implements peak-current-mode control with fixed-frequency PWM, using internal 18mΩ HS and 15mΩ LS MOSFETs to regulate a 6A buck output across 6V–36V input. Its dual-USB subsystem integrates CC1/CC2/CC3/CC4 configuration channel logic, DP/DM handshaking, VCONN sourcing, and automatic mode detection for BC1.2, Apple, and USB Type-C 5V@3A DFP.

Frequency spread spectrum is implemented via a 4kHz triangle wave modulating the oscillator center at 420kHz (±10%), activated only when FREQ is floated or tied to VCC - distinct from the non-FD variant. Thermal load-shedding triggers at +135°C, and hiccup-mode current limiting protects both buck and USB outputs under overcurrent conditions.

Key Specifications

Pinout & Package

MPQ4488BGU-FD-AEC1-Z is housed in a thermally enhanced QFN-26 (5mm × 5mm, 0.5mm pitch) package with exposed thermal pad. Pin assignment follows MPS standard top-view layout with dedicated PGND/AGND separation, dual SW pins (8/9/26), and four CC pins (CC1/CC2/CC3/CC4) for independent Type-C port negotiation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4488BGU-AEC1-Z, the FD variant adds mandatory spread-spectrum for automotive EMC; compared with NCP81239, MPQ4488BGU-FD-AEC1-Z integrates full USB physical layer and auto-detection, reducing total solution size by 38% and eliminating firmware dependency for basic charging.

Availability

MPQ4488BGU-FD-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and ADAS display systems requiring stable component supply, AEC-Q100 qualification, and dual-USB charging compliance.

Supply support for MPQ4488BGU-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 power management ICs, with core expertise in DC-DC conversion, motor drivers, and USB power delivery solutions.

The MPQ4488B product line targets automotive-grade power management for infotainment and connectivity modules, integrating buck regulation, USB charging, and Type-C negotiation into a single AEC-Q100-qualified device to simplify system-level power architecture.

FAQ

What USB charging protocols does MPQ4488BGU-FD-AEC1-Z support natively?

It supports USB Battery Charging Specification v1.2 (BC1.2) DCP mode, Apple 3A Divider mode, 1.2V/1.2V handshake, and USB Type-C 5V @ 3A Downstream Facing Port (DFP) mode - all without external firmware or host processor involvement. CC1/CC2 and CC3/CC4 pins handle full Type-C cable detection and VCONN sourcing.

How does the spread-spectrum function differ between MPQ4488BGU-FD-AEC1-Z and MPQ4488BGU-AEC1-Z?

Only the FD variant implements ±10% frequency modulation centered at 420kHz using a 4kHz triangle wave - activated automatically when FREQ is floated or tied to VCC. The non-FD version lacks this feature entirely and operates at fixed or resistor-programmed frequencies without dithering.

Can MPQ4488BGU-FD-AEC1-Z operate with input voltage below 6V?

No - its absolute minimum operating input voltage is 6V, enforced by an internal UVLO threshold of 4.6V to 5.4V (rising). Below 6V, the device remains in shutdown with only 13–18μA quiescent current; it will not regulate or deliver output power.

What is the purpose of the OUT_SEL pin, and how does it affect output voltage accuracy?

OUT_SEL selects one of three factory-trimmed output voltages: 5.10V (±2%), 5.17V (±1% at 25°C, ±2% over −40°C to +125°C), or 5.30V (±2%). No external resistors are needed - logic state alone determines VOUT, enabling precise USB voltage compliance without calibration overhead.

Is thermal derating required for continuous 6A output in automotive environments?

Yes - at +85°C ambient on a 4-layer 50mm×50mm PCB, maximum continuous output is ~5.2A due to thermal limits. Full 6A is achievable at ≤+60°C ambient. Load-shedding initiates at +135°C junction temperature, reducing USB current before thermal shutdown occurs.

Does MPQ4488BGU-FD-AEC1-Z support USB Power Delivery (PD) negotiation?

No - it implements only USB Type-C 5V@3A DFP mode (no variable voltage or current negotiation). It detects Type-C attachment via CC pins and sources VCONN, but does not support PD messaging, alternate modes, or voltages above 5V.

How is hiccup-mode current limiting implemented on the USB outputs?

Each USB port has independent hiccup-mode OCP: upon current limit violation (e.g., short circuit), the switch turns off for 3ms (on-time), then attempts restart. If fault persists, it enters 1–3 second off-time cycles until cleared - preventing thermal runaway while allowing self-recovery.