Monolithic Power Systems Inc. MP4572GQB-P

Overview

MP4572GQB-P from Monolithic Power Systems is a fully integrated, synchronous buck converter delivering up to 2A continuous output current with 4.5V–60V input range, 0.8V reference voltage (±1% at 25°C), 40μA quiescent current, and internal 250mΩ/45mΩ MOSFETs - designed for automotive infotainment, LED lamps, and motor control power rails.

For engineers reviewing the MP4572GQB-P datasheet, MP4572GQB-P pinout, MP4572GQB-P application, or MP4572GQB-P equivalent, key selection criteria include cold-crank low-dropout mode, valley-current OCP with hiccup SCP, AAM/CCM light-load operation selection, and QFN-12 (2.5mm×3mm) thermal performance under -40°C to +125°C junction conditions.

Technical Context

The MP4572GQB-P employs peak-current-mode PWM control with internal slope compensation and valley-current detection for over-current protection. Its asynchronous modulation (AAM) dynamically scales switching frequency below 2.2MHz to reduce gate and switching losses during light load, while forced CCM maintains fixed-frequency operation when required.

It integrates bootstrap circuitry (BST–SW), power-good monitoring (PG open-drain), remote enable (EN), frequency programming (FREQ resistor), and 180° out-of-phase SYNCO clock output for multi-phase synchronization - all within a thermally enhanced QFN-12 package with exposed thermal pad.

Key Specifications

Pinout & Package

MP4572GQB-P is housed in a thermally optimized QFN-12 package (2.5mm × 3mm, 0.5mm pitch) with an exposed thermal pad for direct PCB copper connection. The package supports JEDEC-standard reflow and meets MSL Level 1 moisture sensitivity requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4572GQB-AEC1, the MP4572GQB-P omits automotive qualification documentation but retains identical silicon and performance - making it ideal for cost-sensitive prototyping and non-automotive industrial designs. Against LM61480RGER, it trades peak current capacity for lower IQ, wider VIN, and adaptive light-load efficiency.

Availability

MP4572GQB-P is available at Aetrix Electronics and suitable for automotive infotainment, LED lighting, and industrial power systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP4572GQB-P 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 design centers in the US, China, and Taiwan.

The MP4572 belongs to MPS's automotive-grade buck converter product line, engineered specifically for harsh-environment DC/DC conversion in vehicles - emphasizing cold-crank resilience, low IQ, and integrated protection.

FAQ

What is the minimum input voltage for reliable startup?

The MP4572GQB-P starts reliably at 4.5V nominal input due to its internal UVLO rising threshold of 4.0V (typical). Below this, the device remains disabled until VIN exceeds the hysteresis margin (500mV), ensuring clean turn-on after cold-crank recovery.

Can the MP4572GQB-P operate without an external bootstrap capacitor?

No - the BST pin requires a 0.1µF ceramic capacitor connected between BST and SW to sustain high-side gate drive. Omitting it causes immediate failure of the upper MOSFET and loss of regulation.

How does the CCM/SYNCO pin function in AAM mode?

In AAM mode (CCM pin floating), the pin is inactive. When pulled to GND, it forces fixed-frequency CCM operation and simultaneously outputs a 180° out-of-phase clock signal for synchronizing secondary converters - enabling interleaved operation without external timing ICs.

Is the PG pin compatible with 3.3V logic systems?

Yes - the PG pin is open-drain and requires an external pull-up to any supply between 1.8V and 6V. For 3.3V systems, use a 10kΩ pull-up to 3.3V; PG asserts high when VOUT is within 90–108% of the regulated value.

What thermal pad layout guidelines apply to the QFN-12 package?

The exposed thermal pad must be soldered to a minimum 25mm² copper area with ≥4 thermal vias (0.3mm diameter, filled or capped) connecting to inner ground planes. Avoid solder mask over the pad to maximize thermal transfer and ensure θJA ≤ 45°C/W on standard 4-layer boards.

Does the MP4572GQB-P support adjustable soft-start time?

No - soft-start is fixed at 0.45ms internal ramp. Output voltage rises linearly from 0V to final setpoint in that time; no external capacitor or resistor adjusts duration. This ensures consistent startup behavior across temperature and unit variance.

How is input overvoltage protected beyond the 65V absolute maximum rating?

The device has no internal overvoltage clamp on the IN pin. Protection relies on external circuitry - such as TVS diodes or active clamping - since the 65V rating is absolute maximum stress, not operational limit. Sustained operation above 60V violates recommended conditions and risks permanent damage.