Monolithic Power Systems Inc. MP2148GQD-12-P

Overview

MP2148GQD-12-P from Monolithic Power Systems is a fixed-output 1.2V, 1A synchronous step-down DC/DC converter in a 1.0mm × 1.5mm QFN-6 package. It operates from 2.3V–5.5V input, delivers ultra-low 11µA quiescent current, uses Constant-On-Time control for fast transient response, and integrates 120mΩ/80mΩ internal PMOS/NMOS power switches - optimized for battery-powered wearable devices requiring stable low-voltage I/O rail generation.

For engineers reviewing the MP2148GQD-12-P datasheet, MP2148GQD-12-P pinout, MP2148GQD-12-P application, or MP2148GQD-12-P equivalent, key selection criteria include its fixed 1.2V output with ±1% tolerance over –40°C to +125°C, integrated power-good (PG) indicator with 70µs delay, 2.2MHz switching frequency enabling compact 1µH inductor use, and output discharge capability during shutdown.

Technical Context

The MP2148GQD-12-P implements Constant-On-Time (COT) control with input-voltage feedforward, maintaining stable ~2.2MHz switching across its 2.3V–5.5V input range while delivering regulated 1.2V output. Its architecture integrates high-side (120mΩ) and low-side (80mΩ) MOSFETs, eliminating external switch requirements.

It features dedicated PG open-drain output with 85%–90% voltage window detection, 70µs delay, and 400mV max sink voltage at 1mA - enabling precise system power sequencing. Fault protection includes cycle-by-cycle current limiting (2.4A peak), thermal shutdown at 160°C with 30°C hysteresis, and hiccup-mode short-circuit recovery.

Key Specifications

Pinout & Package

MP2148GQD-12-P is housed in an ultra-compact QFN-6 package (1.0mm × 1.5mm, 0.5mm pitch) with exposed thermal pad for enhanced power dissipation. The pinout supports minimal external component count: only input/output capacitors, inductor, and optional PG pull-up resistor are required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP2148GQD-12-P uniquely combines ultra-low 11µA IQ, integrated PG with tight 85–90% window, and zero external compensation - making it optimal for size- and battery-limited wearables where autonomous power sequencing and longevity are critical.

Availability

MP2148GQD-12-P is available at Aetrix Electronics and suitable for wireless earbuds, medical patches, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.

Supply support for MP2148GQD-12-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.

The MP2148 product line targets ultra-compact, battery-optimized DC/DC conversion for wearables and portable electronics - emphasizing minimal footprint, nanoscale IQ, and integrated system-level functions like PG and output discharge.

FAQ

What is the maximum allowable input voltage for MP2148GQD-12-P?

The absolute maximum input voltage is 6V, but the recommended operating range is strictly 2.3V to 5.5V. Exceeding 5.5V risks permanent damage even for brief transients; designs powered from 5V USB must ensure no overshoot exceeds this limit via proper input filtering.

Does MP2148GQD-12-P require external feedback resistors?

No - MP2148GQD-12-P has factory-trimmed internal feedback for fixed 1.2V output. Unlike the adjustable MP2148GQD variant, it eliminates external R1/R2 dividers, reducing BOM count and PCB area while guaranteeing ±1% output accuracy over temperature.

How does the power-good (PG) pin behave during startup and fault conditions?

PG remains low until VOUT reaches 90% of 1.2V (1.08V), then transitions high after 70µs delay. If VOUT drops below 85% (1.02V) during operation, PG pulls low within microseconds. During thermal shutdown or overcurrent hiccup, PG asserts low immediately upon regulation loss.

Can MP2148GQD-12-P operate with 100% duty cycle, and under what conditions?

Yes - it supports 100% duty cycle when VIN ≤ VOUT + (IOUT × RDSON_P), enabling dropout operation down to VIN ≈ 1.22V at light loads. This extends usable battery range in single-cell Li-ion applications where voltage falls below 1.2V nominal during deep discharge.

What is the purpose of the output discharge feature, and how is it implemented?

Output discharge rapidly collapses VOUT to GND when EN is pulled low, preventing residual charge from powering downstream circuitry or causing undefined MCU states. It uses an internal NMOS FET (RDIS ≈ 1kΩ) between OUT and GND, activated automatically during shutdown without external components.

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

Yes - MP2148GQD-12-P is fully RoHS-compliant, lead-free, and halogen-free per MPS quality assurance standards. The package uses standard SnAgCu solder paste profiles and supports reflow per J-STD-020, with maximum peak temperature of 260°C.