Monolithic Power Systems Inc. MP2565DN-LF-P

Overview

MP2565DN-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 220mΩ high-side MOSFET, delivering up to 2.5A output current across a 4.5V–50V input range and supporting adjustable output voltages from 0.8V to 47V. It operates at programmable switching frequencies up to 4MHz and features current-mode control, internal soft-start, and thermal shutdown-enabling compact, high-efficiency power conversion in automotive and industrial systems.

For engineers reviewing the MP2565DN-LF-P datasheet, MP2565DN-LF-P pinout, MP2565DN-LF-P application, or MP2565DN-LF-P equivalent, key selection criteria include its 4MHz max switching frequency for EMI-sensitive designs, 12µA shutdown current for battery operation, 0.8V feedback reference accuracy (±2.4%), 100ns minimum on/off times for high-duty-cycle support, and SOIC8E thermally enhanced package with exposed pad.

Technical Context

The MP2565DN-LF-P implements variable-frequency current-mode PWM control with cycle-by-cycle peak current limiting and internal error amplifier transconductance of 40–80µA/V. Its oscillator frequency is set externally via resistor-to-ground on the FREQ pin, enabling precise tuning from 1.6MHz to 4.8MHz.

It integrates a 2.6V internal regulator for core logic, bootstrap charging circuitry for the high-side gate driver, and UVLO with 3.0V rising threshold and 0.4V hysteresis. Thermal shutdown activates at 150°C with 15°C hysteresis, and the COMP pin provides direct access to the error amplifier output for loop compensation.

Key Specifications

Pinout & Package

MP2565DN-LF-P uses the thermally enhanced SOIC8E package (8-pin, exposed thermal pad), with pin 5 (GND) and the underside exposed pad both requiring connection to system ground for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2565DN-LF-P, MP2451DT-LF-Z offers smaller footprint but sacrifices input voltage range and output current, while LM5164QDRCRQ1 adds automotive qualification and input voltage headroom at the cost of higher BOM count and lower output capability.

Availability

MP2565DN-LF-P is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and battery-powered test equipment requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP2565DN-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 two decades of innovation in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2565 belongs to MPS's high-voltage buck converter product line, engineered for rugged, high-efficiency power delivery in automotive, industrial, and telecom infrastructure where wide input range and thermal resilience are critical.

FAQ

What is the maximum recommended output voltage for MP2565DN-LF-P?

The MP2565DN-LF-P supports output voltages up to 47V, determined by the feedback divider ratio and the 0.8V internal reference. This is validated across the full 4.5V–50V input range and confirmed in the Absolute Maximum Ratings table (V_OUT ≤ V_IN – V_SW dropout). Operation above 47V risks violating internal comparator limits and is not guaranteed.

Can MP2565DN-LF-P operate with a 3.3V input supply?

No. The MP2565DN-LF-P has a minimum input voltage of 4.5V, enforced by its internal UVLO circuit (rising threshold 3.0V, hysteresis 0.4V). At 3.3V, the device remains in undervoltage lockout and will not start or regulate. This is specified in the Recommended Operating Conditions section of the datasheet.

Is an external bootstrap diode required for reliable operation?

No external bootstrap diode is required under normal operation. The MP2565DN-LF-P integrates a dedicated bootstrap regulator that charges the BST–SW capacitor from VIN during low-SW periods. An external diode is only recommended in high-duty-cycle (>90%) applications where internal charging time is insufficient-per Application Note AN-103.

How does frequency foldback improve light-load efficiency?

Frequency foldback dynamically reduces switching frequency at light loads, lowering gate-driving and switching losses. This extends the high-efficiency region down to ~10mA load current, achieving >85% efficiency at 100mA with 12V input and 5V output-measured in Typical Performance Characteristics Figure 5.

What is the thermal resistance (θ_JA) of the SOIC8E package?

The SOIC8E package has a measured θ_JA of 50°C/W on a standard 4-layer JEDEC PCB (JESD51-7), with θ_JC = 10°C/W. This value assumes the exposed pad is fully soldered to a solid internal ground plane; inadequate pad connection increases thermal resistance significantly.

Does MP2565DN-LF-P support synchronous rectification?

No. MP2565DN-LF-P is a non-synchronous buck converter and requires an external Schottky diode for freewheeling current path. It lacks a low-side MOSFET driver or control logic for synchronous operation-confirmed in the Block Diagram and OPERATION section describing "non-synchronous" topology.

What is the minimum output capacitor ESR requirement for stability?

The MP2565DN-LF-P is designed to remain stable with ceramic capacitors (ESR <10mΩ) and does not require minimum ESR. Its current-mode architecture and internal compensation allow stable operation across a wide range of output capacitance (22µF–220µF) and ESR values, as verified in Compensation Components section and Table 3.