Monolithic Power Systems Inc. MP2148GQD-12-Z

Overview

MP2148GQD-12-Z from Monolithic Power Systems is a fixed-output 1.2V, 1A synchronous step-down DC/DC converter with 11µA quiescent current, Constant-On-Time control, and integrated 120mΩ/80mΩ MOSFETs. It operates from 2.3V–5.5V input, delivers regulated output down to 0.6V (adjustable version), and features power-good indication, output discharge, and hiccup-mode short-circuit protection. It targets space-constrained, battery-powered systems requiring ultra-low IQ and fast transient response.

For engineers reviewing the MP2148GQD-12-Z datasheet, MP2148GQD-12-Z pinout, MP2148GQD-12-Z application, or MP2148GQD-12-Z equivalent, key selection criteria include its 1.2V fixed output tolerance (±1%), 2.2MHz switching frequency for compact filter design, 100% duty cycle capability, thermal shutdown at 160°C, and QFN-6 (1.0×1.5mm) package compatibility with high-density portable PCB layouts.

Technical Context

The MP2148GQD-12-Z employs Constant-On-Time (COT) control with input-voltage feedforward to maintain stable switching frequency across input and load variations. Its internal PFET/NFET power stage enables synchronous rectification without external diodes, reducing conduction loss and improving light-load efficiency via AAM (Advanced Asynchronous Modulation) and sleep mode.

It integrates a dedicated open-drain Power Good (PG) output with ±5% window detection (85–90% of VOUT), 70µs delay, and 400mV sink capability under 1mA load. The EN pin supports precise power sequencing with 1.2V logic-high threshold, 0.4V logic-low threshold, and internal 1MΩ pull-down resistor.

Key Specifications

Pinout & Package

MP2148GQD-12-Z 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 index area on top surface; bottom-side paddle must be soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP2148GQD-12-Z offers the smallest footprint and lowest IQ-critical for wearables and coin-cell devices-while retaining PG functionality and thermal robustness, making it optimal for next-generation miniaturized, long-life power systems.

Availability

MP2148GQD-12-Z is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable health monitors, and portable medical diagnostics requiring stable component supply, full lifecycle traceability, and RoHS-compliant packaging.

Supply support for MP2148GQD-12-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2148 product line targets ultra-compact, ultra-low-power portable electronics, delivering high-efficiency step-down regulation in sub-2mm² packages without sacrificing protection features or thermal resilience.

FAQ

What is the function of the FB/PG pin on MP2148GQD-12-Z?

The FB/PG pin serves exclusively as a Power Good (PG) indicator for the MP2148GQD-12-Z variant. It is an open-drain output that pulls low when the regulated 1.2V output falls outside the ±5% window (1.14–1.26V). An external pull-up resistor (100kΩ–500kΩ) to a voltage ≤VIN is required to generate a valid logic-high signal during normal operation.

Does MP2148GQD-12-Z support 100% duty cycle operation?

Yes. MP2148GQD-12-Z supports 100% duty cycle operation, enabling regulation even when the input voltage drops close to the 1.2V output level-critical for maximizing battery utilization in single-cell systems. This behavior is confirmed in the datasheet's "Features" list and validated across the full 2.3V–5.5V input range.

Can MP2148GQD-12-Z be used with ceramic output capacitors only?

Yes, and it is explicitly designed for low-ESR ceramic output capacitors. The control loop is optimized for ceramic stability, eliminating the need for tantalum or electrolytic capacitors. Using ≥10µF X5R/X7R ceramics ensures low output ripple (<10mV p-p) and avoids phase-margin issues common with higher-ESR alternatives.

What is the purpose of the internal output discharge feature?

The internal output discharge MOSFET activates automatically when the EN pin is pulled low, providing a 1kΩ resistive path from OUT to GND. This rapidly discharges the output capacitor, preventing residual voltage from interfering with system reset sequencing or causing latch-up in downstream logic-especially important in multi-rail power systems.

How does the hiccup-mode short-circuit protection work?

Upon detecting overcurrent (e.g., short at VOUT), MP2148GQD-12-Z disables the power stage, discharges the soft-start capacitor, and enters a recovery cycle with ~70µs PG delay. It attempts soft-start again; if the fault persists, it repeats the cycle. This limits average power dissipation to safe levels (<100mW), preventing thermal damage while maintaining self-recovery capability without external intervention.

Is the QFN-6 (1.0mm×1.5mm) package lead-free and RoHS-compliant?

Yes. MP2148GQD-12-Z is fully lead-free, halogen-free, and compliant with the EU RoHS Directive. All MPS products meet these environmental standards, and green status documentation is publicly available on the Monolithic Power Systems website under Quality Assurance resources.