Monolithic Power Systems Inc. MP2144GJ-P

Overview

MP2144GJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 90mΩ high-side and 60mΩ low-side MOSFETs, delivering up to 2A continuous output current from a 2.5V–5.5V input, regulating output down to 0.6V, featuring constant-on-time (COT) control, 40μA quiescent current, and 1.2MHz switching frequency - used in FPGA core power, smartphone PMIC rails, and portable instrument I/O supplies.

For engineers reviewing the MP2144GJ-P datasheet, MP2144GJ-P pinout, MP2144GJ-P application, or MP2144GJ-P equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options for low-voltage, high-efficiency buck conversion in space-constrained battery-powered systems.

Technical Context

The MP2144GJ-P implements a constant-on-time (COT) control architecture with input voltage feed-forward, enabling stable 1.2MHz switching across its full 2.5V–5.5V input range and supporting fast load transient response without external compensation. Its internal PFET/NFET power stage eliminates external MOSFETs and gate drivers.

It integrates EN logic-level enable (1.2V threshold), open-drain Power-Good (PG) with ±10% FB window and 500kΩ internal pull-up, soft-start (1.3ms ramp), hiccup-mode short-circuit protection, and thermal shutdown at 150°C with 30°C hysteresis - all in a TSOT23-8 package with separate AGND and PGND pins for noise isolation.

Key Specifications

Pinout & Package

MP2144GJ-P is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), with exposed pad connected to PGND for improved heat dissipation and EMI performance. Pin 1 is bottom-left when top marking is read left-to-right.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2144GJ-P, MP2182GJ-Z offers higher current and efficiency but demands layout revision, while TPS62231DRYR provides lower I_Q and smaller size at the cost of design flexibility and missing PG/OUT-sense functionality - making MP2144GJ-P optimal for adjustable, sequenced, and space-constrained 2A applications.

Availability

MP2144GJ-P is available at Aetrix Electronics and suitable for FPGA power delivery, smartphone subsystem rails, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2144GJ-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 expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2144 belongs to MPS's mainstream synchronous buck converter product line, designed specifically for compact, high-efficiency power delivery in battery-powered and space-constrained embedded systems - emphasizing low I_Q, fast transient response, and robust protection.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2144GJ-P is stable with ≥10μF ceramic output capacitance (X5R/X7R). For 1.2V/2A operation, 22μF is recommended to limit output ripple to <20mV peak-to-peak. Lower values risk instability under heavy load transients due to reduced phase margin in the COT loop.

Can MP2144GJ-P operate with input voltage below 2.5V?

No. The absolute minimum operating input voltage is 2.5V per datasheet specifications. Below this, UVLO prevents startup, and internal bias circuits cannot sustain regulation. At 2.4V input, the device remains disabled even if EN is high.

How does the PG pin behave during thermal shutdown?

During thermal shutdown, the FB voltage drops outside the ±10% regulation window, causing the PG pin to discharge to ground via its internal NMOS. PG remains low until junction temperature falls below 120°C (150°C − 30°C hysteresis) and regulation resumes.

Is the OUT pin mandatory for all applications?

Yes. The OUT pin enables remote output voltage sensing to compensate for PCB trace IR drop. Omitting it degrades load regulation accuracy by up to ±3% at full load - unacceptable for precision rails like FPGA VCCIO or ADC references.

What is the maximum allowable inductor DCR for 2A operation?

Inductor DCR must be ≤15mΩ to maintain thermal performance and efficiency. At 2A, higher DCR increases conduction loss, raising die temperature beyond the 125°C max operating junction limit - triggering premature thermal shutdown.

Does MP2144GJ-P support forced PWM mode?

No. It operates exclusively in COT mode with automatic transition between continuous and discontinuous conduction. There is no pin or register to force fixed-frequency PWM; light-load efficiency is managed via proprietary LS-FET current ramp-down.

What is the purpose of separating AGND and PGND pins?

AGND provides low-noise reference for the FB comparator and error amplifier; PGND carries high di/dt switching currents. Separating them prevents ground bounce from corrupting feedback accuracy - essential for maintaining <1% output regulation under dynamic load.