Monolithic Power Systems Inc. MPQ4253AGU-AEC1-Z

Overview

MPQ4253AGU-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, monolithic synchronous step-down converter with integrated dual USB charging ports - one USB Type-C (DFP, 5V/3A) and one USB Type-A (BC1.2/Apple/1.2V-compatible). It delivers up to 6A buck output across 6V–36V input, supports load-shedding (Type-C down to 1.5A when Type-A is active), and features peak current mode control, PFM/PWM auto-transition, and full hiccup OVP/thermal protection. Used in automotive infotainment and center console USB hubs.

For engineers reviewing the MPQ4253AGU-AEC1-Z datasheet, MPQ4253AGU-AEC1-Z pinout, MPQ4253AGU-AEC1-Z application, or MPQ4253AGU-AEC1-Z equivalent, key selection criteria include its dual-protocol USB port integration, AEC-Q100 qualification, QFN-26 package thermal performance, and programmable 5.1V/5.17V/5.3V output with 90mV line drop compensation.

Technical Context

The MPQ4253AGU-AEC1-Z implements a fixed-frequency peak current mode buck controller with internal 18mΩ/15mΩ HS/LS MOSFETs and automatic PFM entry below ~0.3A load. Its dual-USB subsystem includes independent current-limit switches (18mΩ each), CC1/CC2 configuration channel logic for Type-C detection, and DP1/DM1 + DP2/DM2 data lines supporting BC1.2 DCP, Apple Divider 3, and 1.2V/1.2V handshaking without external firmware.

Load-shedding is triggered via ISENS+/ISENS− monitoring of USB2 current: when USB2 exceeds threshold, the IC dynamically reconfigures USB1's CC pull-up resistance from 56kΩ to 22kΩ, signaling 1.5A capability to connected Type-C devices. Output voltage is set by OUT_SEL (low/float/high = 5.1V/5.17V/5.3V), and switching frequency is adjustable from 250kHz to 1MHz via FREQ pin resistor or spread-spectrum 480kHz when floating.

Key Specifications

Pinout & Package

MPQ4253AGU-AEC1-Z is housed in a thermally enhanced QFN-26 (5mm × 5mm, 0.5mm pitch) package with exposed thermal pad. Pin layout supports optimal power-ground separation and USB signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4252AGU-AEC1-Z, the MPQ4253AGU-AEC1-Z adds essential Type-C infrastructure and dynamic load management; versus TPS65987D-64, it delivers simpler, lower-cost 5V-only operation without PD stack overhead or external power stage.

Availability

MPQ4253AGU-AEC1-Z is available at Aetrix Electronics and suitable for automotive center console charging hubs, infotainment system USB power modules, and rear seat entertainment systems requiring stable component supply with AEC-Q100 assurance.

Supply support for MPQ4253AGU-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 for automotive, industrial, and consumer applications.

The MPQ4253A product line targets automotive USB charging infrastructure, integrating buck conversion, USB protocol handling, and safety-critical protection into a single AEC-Q100-qualified device to reduce system complexity and validation effort.

FAQ

What is the purpose of the ISENS+ and ISENS− pins?

ISENS+ and ISENS− monitor USB2 output current via an external sense resistor. When USB2 load exceeds threshold, the IC automatically reconfigures USB1's CC pull-up resistance from 56kΩ to 22kΩ, signaling reduced 1.5A capability to connected Type-C devices - enabling hardware-based load-shedding without MCU intervention.

How does the MPQ4253AGU-AEC1-Z achieve AEC-Q100 Grade 1 qualification?

It undergoes rigorous stress testing per AEC-Q100 Rev G, including operating life at 125°C junction temperature, thermal cycling (−40°C to +125°C), and HTOL (high-temperature operating life) for 1000 hours. All parameters - including R_DS(ON), current limit, and OVP - are guaranteed across −40°C to +125°C TJ.

Can the USB1 and USB2 ports operate simultaneously at full 3A each?

No. The buck converter delivers up to 6A total, but USB1 is hardware-limited to 1.5A when USB2 detects a connected device (via ISENS). Simultaneous 3A/3A operation is prevented by design to avoid exceeding thermal limits and ensure stable VBUS regulation under worst-case PCB layout conditions.

What is the function of the OUT_SEL pin, and how does it affect USB compliance?

OUT_SEL selects buck output voltage: low = 5.1V, float = 5.17V, high = 5.3V. The 5.17V default aligns with USB IF spec nominal VBUS (5.0V ±5%), allowing margin for line drop compensation (90mV) and ensuring ≥4.75V at the connector under full 3A load - directly supporting USB 2.0 electrical compliance.

Is external VCC biasing required, and why?

Yes. VCC must be pre-biased to ≥2.3V before VIN ramp-up using a resistor + 5.1V Zener from VIN to GND. This powers internal logic and gate drivers prior to buck startup. Once the buck output reaches regulation, VCC is maintained via internal LDO biased from OUT through a Schottky diode - ensuring seamless handoff and avoiding start-up failure.

Does the MPQ4253AGU-AEC1-Z support USB Power Delivery (PD) negotiation?

No. It supports USB Type-C DFP 5V/3A only - fixed-voltage sourcing with CC-based detection and RP reconfiguration. It does not implement USB PD communication (BMC signaling), VDM/SOP packets, or variable voltage (9V/15V/20V) - those require a dedicated USB PD controller like MPS MPQ4272 or TI TPS6598x.

What is the role of the FREQ pin in EMI reduction?

When floated, FREQ enables built-in spread-spectrum modulation: a 4kHz triangle wave dithers the 480kHz switching frequency by ±10%, spreading energy across a 96kHz band. This lowers peak radiated emissions by up to 10dB, helping meet stringent automotive CISPR 25 Class 5 limits without added filtering components.