Monolithic Power Systems Inc. MP2148GQD-25-P

Overview

MP2148GQD-25-P from Monolithic Power Systems is a fixed-output 2.5V, 1A synchronous step-down DC/DC converter in a QFN-6 (1.0mm × 1.5mm) package. It operates from 2.3V–5.5V input, delivers ±1% output accuracy over temperature, features 11µA quiescent current, 2.2MHz switching frequency, and integrated 120mΩ/80mΩ MOSFETs for high-efficiency power conversion in space-constrained portable systems.

For engineers reviewing the MP2148GQD-25-P datasheet, MP2148GQD-25-P pinout, MP2148GQD-25-P application, or MP2148GQD-25-P equivalent, key selection criteria include fixed 2.5V output tolerance (±1% at −40°C to +125°C), Power Good open-drain indicator with 70µs delay, hiccup-mode short-circuit protection, and compatibility with low-ESR ceramic output capacitors without external compensation.

Technical Context

The MP2148GQD-25-P uses Constant-On-Time (COT) control with input-voltage feedforward to maintain stable 2.2MHz switching across its 2.3V–5.5V input range. Its internal architecture integrates high-side P-channel (120mΩ) and low-side N-channel (80mΩ) MOSFETs, eliminating external switches and reducing BOM count.

It implements sleep mode and Advanced Asynchronous Modulation (AAM) with Zero Current Detection (ZCD) to sustain high light-load efficiency. The fixed 2.5V output version includes a dedicated open-drain Power Good (PG) pin with 85–90% trip thresholds and 400mV sink capability under 1mA load.

Key Specifications

Pinout & Package

MP2148GQD-25-P is housed in an ultra-small QFN-6 package (1.0mm × 1.5mm, 0.5mm pitch) with exposed thermal pad for enhanced power dissipation. Pin 1 is marked by a dot or notch on the top surface; the exposed pad must be soldered to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck converter applications.

Compared with TPS62231DRYR and ADP2302AUJZ-2.5-R7, MP2148GQD-25-P uniquely combines 1A capability, 11µA IQ, and integrated PG in a 1.0mm × 1.5mm footprint-making it optimal for space- and power-constrained 2.5V rail generation where autonomous fault reporting is essential.

Availability

MP2148GQD-25-P is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable health monitors, industrial IoT edge devices, and low-voltage FPGA I/O banks requiring stable component supply across product lifecycles.

Supply support for MP2148GQD-25-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2148 product line targets ultra-compact, ultra-low-power DC/DC conversion for portable, battery-operated, and space-constrained electronics-emphasizing minimal external components, nanoscale packaging, and intelligent light-load efficiency modes.

FAQ

What is the maximum allowable input voltage for MP2148GQD-25-P?

The absolute maximum input voltage is 6V, but the recommended operating range is strictly 2.3V to 5.5V. Exceeding 5.5V may trigger overvoltage stress on internal MOSFETs and gate drivers, potentially degrading long-term reliability even if thermal shutdown does not activate.

Does MP2148GQD-25-P require external compensation components?

No. The MP2148GQD-25-P uses Constant-On-Time control architecture with internal compensation, eliminating the need for external type-II or type-III compensation networks. Stability is guaranteed with standard 10µF ceramic output capacitors and recommended inductor values (0.47–1.5µH).

How does the Power Good (PG) pin behave during startup and fault conditions?

PG remains low until VOUT reaches 85% of 2.5V (2.125V), then transitions high after a 70µs delay. If VOUT drops below 85% or exceeds 90% (2.25V), PG pulls low again. During short-circuit events, PG asserts low within microseconds, providing immediate fault indication to host controllers.

Can MP2148GQD-25-P operate with 100% duty cycle?

Yes. The device supports 100% duty-cycle operation when VIN approaches VOUT (e.g., 2.7V input → 2.5V output), maintaining regulation without dropout-critical for battery-powered systems nearing end-of-discharge voltage.

Is the exposed thermal pad electrically connected internally?

Yes. The exposed pad is internally tied to GND and must be soldered to a solid PCB ground plane. It serves both thermal conduction (θJC = 110°C/W) and electrical grounding; floating or unconnected pads cause thermal derating and potential EMI issues.

What happens to the output during EN pin deactivation?

When EN is pulled low (<0.4V), the device enters shutdown mode, disabling switching and activating an internal 1kΩ discharge path from OUT to GND. This discharges the output capacitor within ~1ms (dependent on COUT value), ensuring rapid rail collapse for safe state transitions.

Does MP2148GQD-25-P support forced PWM or skip-mode operation?

No. It operates exclusively in automatic AAM (Advanced Asynchronous Modulation) mode at light loads and CCM/DCM based on load current. There is no external pin or register to force continuous PWM; modulation is fully autonomous and optimized for efficiency across 10µA–1A load range.