Monolithic Power Systems Inc. MP2562DS-LF-Z

Overview

MP2562DS-LF-Z from Monolithic Power Systems is a non-synchronous step-down DC/DC converter IC with integrated 460mΩ high-side MOSFET, delivering 1A output current across 4.5V–50V input range and adjustable 0.8V–47V output. It operates at up to 4MHz switching frequency with programmable frequency control via external resistor, internal soft-start, and thermal shutdown-designed for automotive power rails and industrial high-voltage point-of-load conversion.

For engineers reviewing the MP2562DS-LF-Z datasheet, MP2562DS-LF-Z pinout, MP2562DS-LF-Z application, or MP2562DS-LF-Z equivalent, key selection criteria include its 12µA shutdown quiescent current for battery systems, 4MHz EMI mitigation capability, current-mode control loop stability, and SOIC8 package compatibility with legacy PCB layouts.

Technical Context

The MP2562DS-LF-Z implements peak-current-mode PWM control with internal error amplifier (Gm = 60µA/V, gain = 200V/V), fixed-frequency operation at light load and frequency foldback during startup to prevent inductor current runaway. Its bootstrap driver regulates BST voltage to ~5V using an external capacitor between BST and SW pins, enabling high-side gate drive under wide VIN conditions.

It features precision enable logic (EN rising threshold = 1.5V, hysteresis = 300mV), internal 0.8V feedback reference with ±3% tolerance, UVLO (3.0V rise / 2.6V fall), and thermal shutdown (150°C trip, 135°C hysteresis). The COMP pin serves as error amplifier output for external compensation network tuning, supporting ceramic output capacitors without external current-sense resistors.

Key Specifications

Pinout & Package

MP2562DS-LF-Z uses the SOIC8 package (body size 4.9mm × 3.9mm, 1.27mm pitch), with exposed pad omitted (QFN10 variant only includes thermal pad). Pin functions are electrically identical to QFN10 but mapped to 8-pin DIP footprint for through-hole or surface-mount compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54202DRCT, MP2562DS-LF-Z uniquely balances 50V input capability, 4MHz programmability, and SOIC8 footprint-making it optimal for space-constrained automotive and industrial converters needing EMI control without AEC-Q100 overhead.

Availability

MP2562DS-LF-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and battery-powered telematics requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP2562DS-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, headquartered in Kirkland, WA, with global design and support centers.

The MP2562 belongs to MPS's high-voltage DC/DC converter product line, engineered for robust operation in automotive, industrial, and telecom environments where wide input range, small solution size, and reliability under voltage transients are essential.

FAQ

What is the minimum recommended input voltage for reliable startup?

The MP2562DS-LF-Z has a VIN UVLO rising threshold of 3.0V with 0.4V hysteresis. Reliable startup occurs at ≥3.0V, but full functionality-including 1A output and 4MHz operation-requires ≥4.5V per datasheet specifications. Below 4.5V, output current derating and frequency instability may occur.

Can the MP2562DS-LF-Z 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 internal floating driver, resulting in no switching action and zero output. This capacitor must be placed within 2mm of the IC pins.

How does frequency foldback improve startup behavior?

During startup, frequency foldback reduces switching frequency when output voltage is low, limiting peak inductor current and preventing magnetic saturation or current runaway. This ensures controlled VOUT ramp-up and avoids triggering overcurrent protection before regulation is established.

Is the SOIC8 package thermally adequate for 1A continuous operation at 50V input?

Yes, with proper PCB layout. The SOIC8 θ_JA is 96°C/W. At 50V input and 3.3V/1A output, power dissipation is ~47W × (1 − 3.3/50) ≈ 4.4W worst-case; junction rise would exceed 150°C without copper pour. Using ≥2 oz Cu, 4 cm² thermal pad, and 4 vias to inner ground plane keeps T_J < 125°C.

Does the FB pin require an external pull-up or pull-down resistor?

No. The FB pin has no internal bias; it is a high-impedance input to the error amplifier. A resistive divider (e.g., 127kΩ/40.2kΩ for 3.3V) is mandatory to set V_OUT. Leaving FB unconnected results in undefined output voltage and potential oscillation.

What is the maximum allowable R_FREQ value for stable 4MHz operation?

Per datasheet Equation: R_FREQ(kΩ) = 180000 / f_S(kHz). For 4MHz (4000kHz), R_FREQ = 45kΩ. However, the "Oscillating Frequency vs R_FREQ" curve shows 45kΩ yields ~1.6MHz. To achieve 4MHz, R_FREQ must be 18kΩ (±1%). Values >20kΩ will reduce frequency below 4MHz.

How does the internal soft-start interact with external enable sequencing?

Soft-start initiates only after EN rises above 1.5V and VIN exceeds UVLO. If EN is pulsed or toggled during soft-start, the SS ramp resets and restarts. This prevents partial startup and ensures monotonic VOUT rise even with noisy enable signals in automotive environments.