Monolithic Power Systems Inc. MP28252EL-LF-P

Overview

MP28252EL-LF-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 190mΩ high-side and 60mΩ low-side MOSFETs, delivering 2A continuous output current across 4.5V–21V input range. It operates at fixed 500kHz switching frequency (syncable 300kHz–2MHz), features internal compensation, 0.805V feedback reference, and power-good monitoring-designed for compact, high-efficiency point-of-load regulation in space-constrained I/O and core rail applications.

For engineers reviewing the MP28252EL-LF-P datasheet, MP28252EL-LF-P pinout, MP28252EL-LF-P application, or MP28252EL-LF-P equivalent, key selection criteria include its 2A output capability at 1.2V/1.8V/2.5V/3.3V adjustable outputs, thermal shutdown at 150°C, EN/SYNC dual-function pin, and QFN14 package layout compatibility with high-density PCB designs.

Technical Context

The MP28252EL-LF-P employs peak-current-mode control with internal 0.805V reference and error amplifier driving a PWM comparator to regulate output voltage. Its proprietary switching loss reduction technique and integrated bootstrap diode enable efficient operation across wide duty cycles up to 90%.

It integrates a 5V VCC regulator powered from VIN, supports external clock synchronization via the EN/SYNC pin, and implements hiccup-mode overcurrent protection triggered when FB falls below 300mV-ensuring robust fault recovery during short-circuit events without latch-off.

Key Specifications

Pinout & Package

MP28252EL-LF-P is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (internally unconnected, must be soldered to PCB GND plane).

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6220AGQW and TPS54202DRCT, the MP28252EL-LF-P uniquely combines SYNC capability, PG output, and 21V input tolerance in a 3×4mm QFN-making it optimal for high-input-voltage, sequenced-power applications where board space and noise control are critical.

Availability

MP28252EL-LF-P is available at Aetrix Electronics and suitable for notebook I/O power, networking system rails, and flat-panel display logic supplies requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP28252EL-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 expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP28252 belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for compact, high-current point-of-load regulation in computing, consumer, and communications equipment where thermal density and layout simplicity are critical.

FAQ

What is the minimum recommended input capacitance for MP28252EL-LF-P?

A 22µF X5R/X7R ceramic capacitor is recommended at the IN pin, placed as close as possible to pins 1 and 11–14. This value ensures adequate RMS current handling (≥1A) and limits input ripple to <100mV under 2A load, based on worst-case condition at VIN = 2×VOUT. Additional 0.1µF ceramic should be added adjacent to the IC for high-frequency decoupling.

Can MP28252EL-LF-P operate with an output voltage lower than 0.805V?

No. The internal reference is fixed at 0.805V, and the feedback amplifier is designed to regulate only at or above this voltage. Output voltages below 0.805V cannot be achieved using the standard FB divider configuration. For sub-0.8V operation, an external reference or different converter architecture is required.

How does the EN/SYNC pin function in automatic startup mode?

In automatic startup, EN/SYNC is biased via a resistor divider from VIN. When VIN exceeds 4.0V (UVLO rising threshold), the internal 1MΩ pull-down ensures EN rises above 1.3V, enabling the device after internal soft-start begins. Startup voltage is set by R_EN1/R_EN2 ratio per the formula: V_{IN_START} = 1.3 × (1 + R_EN1/R_EN2). No external logic driver is needed.

Is an external bootstrap diode required for MP28252EL-LF-P?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when duty cycle exceeds 65% (i.e., V_OUT > 0.65 × V_IN). It improves efficiency by reducing BST capacitor charging losses during high-duty-cycle operation. At typical 1.2V/12V operation (10% duty), the internal bootstrap diode suffices.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is 150°C, at which thermal shutdown activates. Continuous operation should be limited to ≤125°C junction temperature to maintain reliability and lifetime. With θ_JA = 48°C/W and 2.6W max dissipation, ambient must stay ≤85°C under full 2A load with proper PCB copper area on the exposed pad.

Does MP28252EL-LF-P support forced PWM mode at light loads?

No. The MP28252EL-LF-P operates exclusively in continuous conduction mode (CCM) with peak-current control and does not feature pulse-skipping or forced PWM modes. Light-load efficiency is maintained via low quiescent current (0.7mA) and optimized gate drive, but it does not enter discontinuous conduction mode (DCM) or burst mode.