Monolithic Power Systems Inc. MP2562DQ-LF-Z

Overview

MP2562DQ-LF-Z from Monolithic Power Systems is a 1A, 4MHz, 50V non-synchronous step-down DC/DC converter with integrated 460mΩ high-side MOSFET, current-mode control, and programmable switching frequency (up to 4MHz). It operates from 4.5V–50V input, delivers adjustable 0.8V–47V output, and achieves up to 95% efficiency in automotive and industrial power systems.

For engineers reviewing the MP2562DQ-LF-Z datasheet, MP2562DQ-LF-Z pinout, MP2562DQ-LF-Z application, or MP2562DQ-LF-Z equivalent, key selection criteria include its 12µA shutdown quiescent current, internal soft-start, ceramic-capacitor stability, frequency foldback for startup safety, and thermal shutdown protection - all critical for high-voltage battery-powered and automotive subsystem designs.

Technical Context

The MP2562DQ-LF-Z implements peak current-mode PWM control with an internal error amplifier (200 V/V gain, 60 µA/V transconductance), precision 0.8V feedback reference (±3%), and cycle-by-cycle current limiting without external sense resistors. Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from ~1.6 MHz to 4.8 MHz.

It features a dedicated bootstrap driver (BST) for the high-side MOSFET, with internal 5V BST regulation, UVLO (2.7–3.3V VIN threshold, 0.4V hysteresis), and EN pin with 1.3–1.7V enable threshold (300 mV hysteresis). Thermal shutdown activates at 150°C with 15°C hysteresis, and minimum on/off times are both 100 ns.

Key Specifications

Pinout & Package

MP2562DQ-LF-Z is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed thermal pad (must be connected to GND plane). The package supports high-power density layouts and efficient heat dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with MP2562DQ-LF-Z, MP2451DJ-LF-Z trades HV capability and programmability for compactness and cost, while LM5164QDDARQ1 adds AEC-Q100 compliance and higher voltage margin at the expense of larger package and higher BOM complexity.

Availability

MP2562DQ-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and distributed telecom power supplies requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP2562DQ-LF-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 design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP2562 belongs to MPS's high-voltage DC/DC converter product line, engineered for robust operation in automotive, industrial, and telecom applications where wide input range, high frequency, and integrated power stages are essential.

FAQ

What is the maximum recommended input voltage for reliable 4MHz operation?

The MP2562DQ-LF-Z supports 4MHz switching only when input voltage is ≤24V, per manufacturer guidance. At 50V input, maximum recommended frequency drops to 2MHz to ensure sufficient minimum on-time (100 ns) and avoid pulse-skipping instability. Always consult Figure 2 ("Recommended VIN vs. Switching Frequency") in Rev. 1.0 datasheet for derating curves.

Can the MP2562DQ-LF-Z operate without an external bootstrap diode?

Yes - the MP2562DQ-LF-Z integrates a bootstrap regulator that charges the BST capacitor directly from VIN through an internal PMOS transistor. No external bootstrap diode is required. However, a 0.1µF ceramic capacitor must be placed between BST and SW pins, and SW must swing below VIN to enable charging during the off-time.

How does the internal current limit function without a sense resistor?

The MP2562DQ-LF-Z uses a matched current-sense MOSFET integrated alongside the main power switch. This structure provides accurate, temperature-stable current sensing proportional to the main switch current, enabling cycle-by-cycle peak current limiting at 1.8A (typical) without external components or accuracy degradation from PCB trace resistance.

Is the exposed thermal pad electrically connected internally?

No - the exposed pad on the QFN10 package is not internally connected to any signal or power net. It is a dedicated thermal pad that must be soldered to a PCB copper pour tied to GND for optimal thermal performance and EMI reduction. Electrical isolation from internal circuitry is confirmed in the "PIN FUNCTIONS" section of the datasheet.

What output capacitor ESR range is supported for stable operation?

The MP2562DQ-LF-Z supports output capacitors with ESR from 5 mΩ (ceramic) up to 100 mΩ (polymer/tantalum), as verified by compensation flexibility in the datasheet. For ceramic caps, stability relies on C2 ≥ 22µF; for higher-ESR types, the ESR zero can be compensated using the optional C6 capacitor in the COMP network per Table 3 guidelines.

Does the FB pin have internal pull-up or pull-down circuitry?

No - the FB pin has no internal pull-up or pull-down. It is a high-impedance input to the error amplifier and must be connected to a resistive divider between VOUT and GND. Leaving FB unconnected will cause regulation failure. The typical bias current into FB is <100 nA, ensuring minimal divider current impact on accuracy.

How is thermal shutdown behavior implemented during sustained overload?

When junction temperature exceeds 150°C, the MP2562DQ-LF-Z immediately disables the power switch and pulls COMP low. After cooling to ≤135°C (15°C hysteresis), it automatically restarts with soft-start. This hiccup-mode recovery prevents thermal runaway and enables self-recovery without external intervention or latch-up.