Monolithic Power Systems Inc. MP4560DQ-LF-P

Overview

MP4560DQ-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 250mΩ high-side 55V MOSFET, delivering up to 2A output current at up to 2MHz switching frequency across a 3.8V–55V input range and adjustable 0.8V–52V output. It features current-mode control, internal soft-start, and 140μA quiescent current-designed for automotive power rails and industrial high-voltage distributed supplies.

For engineers reviewing the MP4560DQ-LF-P datasheet, MP4560DQ-LF-P pinout, MP4560DQ-LF-P application, or MP4560DQ-LF-P equivalent, key selection criteria include its 2MHz programmable frequency, bootstrap capacitor charging constraints at high duty cycles, thermal shutdown threshold (150°C), and mandatory external Schottky rectifier placement near SW pins.

Technical Context

The MP4560DQ-LF-P operates in fixed-frequency peak-current mode under moderate-to-heavy loads and transitions to pulse-skipping mode at light loads to reduce gate-driving and switching losses. Its error amplifier compares FB voltage against a precision 0.8V reference and drives COMP with clamped 0.9V–2.0V output for loop stability.

Switching frequency is set externally via resistor from FREQ pin to GND (e.g., 95kΩ yields ~1MHz); minimum on/off times are both 100ns. Bootstrap charging relies on VIN–SW voltage differential during diode conduction, requiring careful PCB layout and optional external diode above 1.5MHz operation.

Key Specifications

Pinout & Package

MP4560DQ-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad (pin 5). The exposed pad must be soldered to a dedicated GND plane for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4560DQ-LF-P, MP4572DQ-LF-Z offers higher reliability and reduced design risk for production programs, while LM5164QPWPRQ1 trades complexity for automotive compliance and synchronous efficiency-neither is drop-in compatible without schematic and layout revision.

Availability

MP4560DQ-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and distributed telecom power supplies requiring stable component supply amid long product lifecycles.

Supply support for MP4560DQ-LF-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 analog and power ICs, with over 20 years of expertise in DC/DC conversion, motor drivers, and LED controllers.

The MP4560 belongs to MPS's high-voltage buck converter product line, engineered for robust operation in harsh environments including automotive, industrial, and telecom infrastructure where wide input range and thermal resilience are critical.

FAQ

What is the maximum recommended output current for MP4560DQ-LF-P at 55V input and 5V output?

At 55V_IN/5V_OUT, the theoretical max output current is limited by thermal dissipation. With θ_JA = 50°C/W and T_J(MAX) = 150°C, ambient ≤50°C allows ~1.4A continuous before thermal shutdown activates-verified by derating curves in Figure 7 of Rev. 1.01 datasheet.

Why does MP4560DQ-LF-P require an external Schottky diode, and what specs are mandatory?

The MP4560DQ-LF-P is non-synchronous, so it lacks a low-side MOSFET and relies on an external Schottky diode to conduct inductor current during high-side switch off-time. Diode must have V_RRM ≥ 60V (to exceed 55V_IN + margin) and I_F(AV) ≥ 2.5A (for peak current handling), per Table 2 recommendations.

Can MP4560DQ-LF-P operate reliably at 2MHz with a 3.3V output and 12V input?

Yes, but requires external bootstrap diode (e.g., B290-13-F) due to insufficient natural BST charging time at high duty cycles. Datasheet Section 9.2 confirms this necessity above 1.5MHz; omission causes intermittent dropout and thermal stress.

How does the frequency foldback function during short-circuit events?

When FB ≈ 0V (shorted output), the MP4560DQ-LF-P reduces switching frequency and cuts current limit to ~50% of nominal (≈1.5A). This limits power dissipation to safe levels while maintaining regulation attempt-confirmed in Electrical Characteristics table footnote and Operation section.

Is MP4560DQ-LF-P RoHS-compliant and lead-free?

Yes-per Ordering Information table and Quality Assurance statement, MP4560DQ-LF-P uses RoHS-compliant packaging with lead-free terminations and meets MPS green status requirements as verified on their official website.

What is the minimum recommended output capacitor ESR for stable operation at 2MHz?

No minimum ESR is required-the MP4560DQ-LF-P is explicitly ceramic-capacitor stable. For 2MHz operation, use X7R/X5R 0805 or 1206 ceramics ≥22µF with Z_ESR < 20mΩ at 2MHz; ESR zero compensation is unnecessary unless using high-ESR electrolytics.