Monolithic Power Systems Inc. MP2144GJ-Z

Overview

MP2144GJ-Z 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, and operating at a fixed 1.2MHz switching frequency with 40μA quiescent current. It is used in power rails for FPGAs, DSPs, and portable instrumentation where compact size and fast transient response are critical.

For engineers reviewing the MP2144GJ-Z datasheet, MP2144GJ-Z pinout, MP2144GJ-Z application, or MP2144GJ-Z equivalent, key selection criteria include its constant-on-time (COT) control architecture, TSOT23-8 package footprint, EN/PG sequencing capability, ±10% power-good window, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2144GJ-Z employs a constant-on-time (COT) control scheme with input voltage feed-forward to maintain stable 1.2MHz switching across its 2.5V–5.5V input range and 0.6V–(VIN−0.5V) output range. Its internal PFET/NFET power stage enables 100% duty-cycle operation in dropout and eliminates external Schottky diode requirements.

Fault protection includes cycle-by-cycle over-current limiting (3.3A min), thermal shutdown (150°C), hiccup-mode short-circuit recovery, and auto-discharge during shutdown. The open-drain PG pin provides ±10% regulation monitoring with internal 500kΩ pull-up and <100Ω sink R_DS(on).

Key Specifications

Pinout & Package

MP2144GJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density in space-constrained portable designs. Pin mapping follows JEDEC MO-193BA standard with pin 1 identified by top-mark orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2144GJ-Z, MP2182GJ-Z offers lower quiescent current and higher frequency in identical packaging, making it preferable for new designs, while TPS62231DRYR serves fundamentally different low-power, fixed-output applications and cannot replace MP2144GJ-Z in 2A adjustable-buck roles.

Availability

MP2144GJ-Z is available at Aetrix Electronics and suitable for mobile baseband power, FPGA core supply, portable medical sensor hubs, and optical drive laser bias requiring stable component supply across production lifecycles.

Supply support for MP2144GJ-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 MP2144 belongs to MPS's COT-controlled synchronous buck converter product line, engineered for space-constrained, battery-operated systems demanding high efficiency, fast transient response, and minimal external component count.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2144GJ-Z is stable with ≥22μF ceramic output capacitance (X5R/X7R dielectric). Using less than 10μF risks instability and excessive output ripple due to insufficient energy storage during load transients. The datasheet specifies 22μF as the minimum for 1.2V/2A operation with <20mV_pp ripple.

Does MP2144GJ-Z support forced PWM mode or only COT operation?

The MP2144GJ-Z operates exclusively in constant-on-time (COT) mode and does not support forced PWM or frequency synchronization. Its switching frequency varies ±25% with input/output voltage but remains centered at 1.2MHz under typical conditions (VIN=5V, VOUT=1.2V).

Can the EN pin be driven directly by a 1.8V GPIO without level shifting?

No. The EN pin requires ≥1.2V to enable and ≤0.4V to disable. While 1.8V GPIO exceeds the 1.2V high-threshold, the internal 1MΩ pull-down may cause slow rise/fall times or marginal noise immunity. A dedicated 1.8V-tolerant buffer or RC filter is recommended for robust operation.

What is the maximum allowable thermal resistance θ_JA for full 2A operation at 85°C ambient?

With θ_JA = 100°C/W and T_J(MAX) = 150°C, the maximum allowable power dissipation at 85°C ambient is 0.65W. At 2A/1.2V output, losses ≈0.26W (assuming 90% efficiency), well within limit. Full 2A operation is thermally feasible on standard 4-layer PCBs with adequate copper area.

Is the PG pin compatible with 1.8V logic systems?

Yes. When asserted, PG is pulled to VIN (2.5V–5.5V) via internal 500kΩ resistor; when inactive, it sinks to GND. For 1.8V logic interfaces, a simple resistive divider (e.g., 100kΩ/200kΩ) or level-shifter is required to avoid overvoltage on the receiving IC's input clamp diodes.

How does the MP2144GJ-Z handle startup into a pre-biased output?

The MP2144GJ-Z does not support true pre-bias start-up. If V_OUT is externally held above regulation before EN assertion, the IC may enter hiccup mode or fail to regulate. External circuitry (e.g., MOSFET hold-off) is required to discharge V_OUT prior to enabling.

What is the recommended layout practice for minimizing EMI in MP2144GJ-Z designs?

Minimize SW, VIN, and PGND loop area using short, wide copper pours; place input capacitor ≤2mm from VIN/PGND pins; isolate FB trace from noisy nodes; use solid PGND plane under IC; and avoid routing AGND near SW or inductor. These practices reduce conducted EMI by >15dB per CISPR-22 Class B limits.