Monolithic Power Systems Inc. MP2562DQ-LF-P

Overview

MP2562DQ-LF-P 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 power systems.

For engineers reviewing the MP2562DQ-LF-P datasheet, MP2562DQ-LF-P pinout, MP2562DQ-LF-P application, or MP2562DQ-LF-P equivalent, key selection criteria include its 12µA shutdown quiescent current for battery-powered designs, internal soft-start, ceramic-capacitor stability, and FREQ-pin programmability for EMI-sensitive AM radio and ADSL applications.

Technical Context

The MP2562DQ-LF-P implements variable-frequency peak-current-mode control with internal error amplifier (200 V/V gain, 60 µA/V transconductance), precision 0.8V feedback reference, and cycle-by-cycle current limiting without external sense resistors. Its bootstrap driver regulates BST voltage to ~5V and includes UVLO (2.2V rising threshold) for reliable high-side gate drive.

It features frequency foldback at light load to reduce switching/gate losses, thermal shutdown (150°C trip, 15°C hysteresis), and under-voltage lockout (3.0V rising, 2.6V falling thresholds). The 100ns minimum on/off times constrain maximum duty cycle at high frequencies but enable stable operation up to 4MHz with proper R_FREQ selection.

Key Specifications

Pinout & Package

MP2562DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed thermal pad (to be connected to PCB ground plane). Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2562DQ-LF-P, MP2451DJ-LF-Z trades input voltage headroom and frequency flexibility for ultra-compact size, while LM5164QPWPRQ1 adds automotive qualification and higher VIN tolerance at the cost of larger footprint and higher shutdown current-making MP2562DQ-LF-P optimal for cost-sensitive, space-constrained 50V industrial and telematics designs.

Availability

MP2562DQ-LF-P is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC I/O modules, and battery-powered telematics units requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MP2562DQ-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 design centers in the US, China, and Taiwan, and global distribution since 1997.

The MP2562 belongs to MPS's high-voltage DC/DC converter product line, engineered for robustness in automotive, industrial, and telecom applications where wide input range, EMI resilience, and thermal reliability are mandatory.

FAQ

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

The MP2562DQ-LF-P supports 4MHz switching up to 12V input per manufacturer guidance; above 12V, pulse skipping increases due to 100ns minimum on-time limitation. At 24V input, maximum recommended frequency drops to 2MHz to ensure stable duty-cycle control and avoid current runaway during startup.

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

Yes-the MP2562DQ-LF-P integrates a bootstrap regulator that charges the BST capacitor directly from VIN through an internal PMOS pass transistor. No external bootstrap diode is required, unlike many older buck controllers; only a 0.1µF ceramic capacitor between BST and SW pins is needed.

How does the frequency foldback feature improve light-load efficiency?

At light loads, the MP2562DQ-LF-P automatically reduces switching frequency to lower gate-driving and switching losses. This dynamic scaling maintains >85% efficiency down to 10mA output current-critical for battery longevity in always-on monitoring devices-without requiring external control signals.

Is the exposed thermal pad on the QFN10 package electrically connected internally?

No-the exposed pad is a dedicated thermal slug with no internal electrical connection. It must be soldered to a PCB ground plane using ≥4 thermal vias (0.3mm diameter) to achieve specified θ_JA = 50°C/W and prevent thermal shutdown under 1A continuous load at +85°C ambient.

What is the minimum output voltage achievable with the internal 0.8V reference?

The MP2562DQ-LF-P's feedback reference is fixed at 0.8V, so the absolute minimum regulated output is 0.8V (when FB is tied directly to VOUT). Lower voltages require external amplification or a different controller; the 0.8V reference ensures compatibility with modern low-voltage logic and core supplies.

Does the COMP pin require external compensation components for basic operation?

Yes-COMP is the error amplifier output and must be connected to an external RC network (e.g., 120kΩ + 220pF) to stabilize the control loop. Table 3 in the datasheet provides optimized values for common output voltages and capacitor types; omitting compensation causes oscillation or poor transient response.

How does the internal current limit behave under short-circuit conditions?

Under short-circuit, the MP2562DQ-LF-P enters hiccup mode: it limits peak switch current to ~1.8A, shuts down for ~500µs after overcurrent detection, then retries. This protects the IC and external components while enabling automatic recovery once the fault clears-no latch-off or manual reset required.