Monolithic Power Systems Inc. MP28262EL-LF-P

Overview

MP28262EL-LF-P 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-designed for compact, high-efficiency point-of-load regulation in space-constrained I/O power rails.

For engineers reviewing the MP28262EL-LF-P datasheet, MP28262EL-LF-P pinout, MP28262EL-LF-P application, or MP28262EL-LF-P equivalent, key selection considerations include its QFN-14 (3mm × 4mm) package thermal performance (θJA = 48°C/W), 0.8V adjustable output via resistor divider, ±1.5% feedback voltage accuracy (789–821mV), and cycle-by-cycle over-current protection with hiccup-mode recovery under short-circuit conditions.

Technical Context

The MP28262EL-LF-P employs peak current-mode control with an internal 5V VCC regulator powered from VIN, enabling operation across the full 4.5V–21V input range. Its proprietary bootstrap charging circuit maintains gate drive for the high-side MOSFET, while the error amplifier compares FB voltage against a precision 805mV reference to generate COMP voltage for current-limit threshold modulation.

Power-good (PG) logic monitors FB voltage with 90% rising and 70% falling thresholds relative to regulation setpoint, driving an open-drain output with 4mA sink capability. EN/SYNC functions as both enable input (1.1–1.6V rising threshold) and external synchronization node, supporting seamless frequency alignment without phase shift.

Key Specifications

Pinout & Package

MP28262EL-LF-P is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (connected to GND for optimal heat dissipation). The package complies with JEDEC MO-229 VGED-3 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP28262EL-LF-P, MP28164DJ-LF-Z trades input voltage range and feature set for smaller size and lower cost in 5V-only applications, while RT7272BGJ8F provides greater frequency flexibility at the expense of increased component count and layout sensitivity.

Availability

MP28262EL-LF-P 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, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP28262EL-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP28262 belongs to MPS's high-frequency synchronous buck converter product line, engineered for compact, efficient point-of-load regulation in consumer, computing, and communications equipment where board space and thermal performance are critical constraints.

FAQ

What is the minimum recommended input capacitance for MP28262EL-LF-P?

A 22µF X5R/X7R ceramic capacitor is recommended at the IN pin, placed as close as possible to pins 1 and 12/13. This value ensures adequate RMS current handling (≥1A) and limits input ripple to <50mV under 2A load. For high-reliability applications, parallel a 0.1µF capacitor directly at the IN-GND pads to suppress high-frequency noise.

Can MP28262EL-LF-P operate with an input voltage below 4.5V?

No. The absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions table. Below this, the internal 5V VCC regulator cannot sustain proper bias for control circuitry, and UVLO will disable the device. The 3.8–4.2V UVLO rising threshold ensures reliable startup only above 4.5V nominal.

How is the power-good (PG) signal configured for different output voltages?

PG asserts high when FB voltage exceeds 90% of the regulation setpoint (e.g., 1.08V for 1.2V output) and pulls low when FB falls below 70% (e.g., 0.84V). No external components are needed-the thresholds scale proportionally with the FB divider ratio, making PG inherently compatible with any output voltage set by R1/R2.

Is an external bootstrap diode required for MP28262EL-LF-P?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when duty cycle exceeds 65% (i.e., VOUT > 0.65 × VIN). At 12V input and 3.3V output (27.5% duty), it is unnecessary. At 5V input and 3.3V output (66% duty), adding the diode from VCC to BST improves light-load efficiency by ~2%.

What is the maximum allowable output capacitor ESR for stable operation?

The MP28262EL-LF-P is internally compensated for ceramic output capacitors (low ESR). When using tantalum or electrolytic capacitors, keep ESR ≤ 20mΩ to maintain phase margin >45°. For 47µF ceramic outputs, ESR is typically <5mΩ, eliminating need for external compensation or damping networks.

Does MP28262EL-LF-P support forced PWM mode at light loads?

No. The MP28262EL-LF-P operates exclusively in peak current-mode control with automatic pulse-skipping at light loads to maintain high efficiency. It does not offer a forced PWM pin or mode; skipping behavior is inherent to its control architecture and cannot be disabled.

How does thermal shutdown interact with the exposed pad connection?

Thermal shutdown triggers at 150°C junction temperature. With the exposed pad properly soldered to a ≥100mm² internal GND plane (4+ thermal vias), θJA drops from 48°C/W to ~35°C/W, delaying shutdown onset by ~15°C under 2A load at 60°C ambient-making robust pad connection essential for full-rated performance.