Monolithic Power Systems Inc. MP28262EL-LF-Z

Overview

MP28262EL-LF-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter with integrated 190mΩ high-side and 90mΩ low-side MOSFETs, delivering 2A continuous output current across a 4.5V–21V input range. It operates at a fixed 1.1MHz switching frequency (±10%), supports external clock synchronization from 400kHz to 2MHz, and features internal compensation, power-good indication, and thermal shutdown-used in notebook I/O power rails where compact size and fast transient response are critical.

For engineers reviewing the MP28262EL-LF-Z datasheet, MP28262EL-LF-Z pinout, MP28262EL-LF-Z application, or MP28262EL-LF-Z equivalent, key selection considerations include its QFN-14 3×4mm package with exposed thermal pad, 0.8V adjustable output voltage via resistor divider, cycle-by-cycle over-current protection with hiccup mode, and bootstrap capacitor requirement for high-side gate drive.

Technical Context

The MP28262EL-LF-Z employs peak current-mode control with an internal 1.1MHz oscillator and proprietary switching loss reduction technique. Its error amplifier compares FB voltage against a precision 805mV reference and drives an internal compensation network to generate the COMP signal that regulates MOSFET on-time.

It integrates a 5V VCC regulator powered from VIN, a floating high-side driver with bootstrap supply (BST), and dual ground pins (GND and AGND) isolated internally to minimize noise coupling into the feedback path. Power Good (PG) provides open-drain status signaling with 90% rising and 70% falling thresholds relative to VFB.

Key Specifications

Pinout & Package

The MP28262EL-LF-Z is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with an exposed thermal pad on the underside. The package complies with JEDEC MO-229 VGED-3 and requires soldering the exposed pad to a PCB ground plane for optimal thermal performance (θ_JA = 48°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP28262EL-LF-Z, MP28164DJ-LF-Z sacrifices input voltage range and current capability for portability, while RT7295BGJ8F trades integration (no PG, no internal compensation) for frequency flexibility and smaller footprint-neither offers identical feature parity.

Availability

MP28262EL-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, networking system rails, digital set-top box SoC core supplies, and flat panel display logic supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP28262EL-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 manufacturing partnerships.

The MP28262 belongs to MPS's high-frequency synchronous buck converter product line, engineered for space-constrained computing and consumer electronics applications demanding high efficiency, fast transient response, and minimal external component count.

FAQ

What is the minimum recommended output voltage for MP28262EL-LF-Z?

The MP28262EL-LF-Z supports adjustable output voltages down to 0.8V, set by an external resistor divider on the FB pin. This minimum is defined by the internal 805mV feedback reference voltage and the practical limits of resistor tolerance and noise sensitivity-lower outputs require careful layout and precision resistors to maintain regulation accuracy.

Does MP28262EL-LF-Z require an external bootstrap diode?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when operating at high duty cycles (>65%, i.e., V_OUT/V_IN > 0.65). At lower duty cycles, the internal bootstrap charging circuit suffices; adding the diode improves efficiency by reducing BST capacitor discharge losses but adds cost and board area.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad on the MP28262EL-LF-Z must be soldered to a solid PCB ground plane using ≥4 thermal vias (0.3mm diameter) to achieve the specified θ_JA of 48°C/W. Without this connection, junction temperature rise increases significantly-measured data shows >30°C higher case temperature at 2A load, risking premature thermal shutdown.

Can MP28262EL-LF-Z operate without an external clock source?

Yes-the MP28262EL-LF-Z operates autonomously using its internal 1.1MHz oscillator. The EN/SYNC pin defaults to enable mode when pulled high; external clock injection is optional and used only to synchronize switching with other converters or reduce EMI through frequency alignment.

What is the purpose of separating AGND and GND pins?

AGND and GND are internally isolated to prevent high-current switching noise (from SW, IN, and GND paths) from coupling into the sensitive analog feedback and error amplifier circuitry. AGND must be connected to the system GND at a single point near the IC to preserve signal integrity-this separation improves output voltage accuracy and stability under dynamic loads.

How does the hiccup-mode over-current protection work?

When output current exceeds 3.5A (cycle-by-cycle limit), V_OUT drops until FB falls below 0.7×V_FB (≈560mV), triggering hiccup mode: the IC shuts down for ~10ms, then attempts restart. This repeats until the fault clears, limiting average short-circuit current to <100mA and preventing thermal runaway-unlike latch-off, it enables automatic recovery.