Monolithic Power Systems Inc. MP2148GQD-33-P

Overview

MP2148GQD-33-P from Monolithic Power Systems is a fixed-output 3.3V, 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 ±1% output accuracy over temperature, and features power-good indication, output discharge, and hiccup-mode short-circuit protection. Ideal for powering low-voltage I/O rails in portable and wearable devices.

For engineers reviewing the MP2148GQD-33-P datasheet, MP2148GQD-33-P pinout, MP2148GQD-33-P application, or MP2148GQD-33-P equivalent, key selection criteria include its ultra-small QFN-6 (1.0×1.5mm) footprint, 2.2MHz switching frequency enabling compact filter design, 3.3V fixed output with ±1% regulation, power-good open-drain signaling, and 11µA IQ for battery longevity in always-on systems.

Technical Context

The MP2148GQD-33-P implements Constant-On-Time (COT) control with input-voltage feedforward to maintain stable 2.2MHz switching across 2.3V–5.5V input and 3.3V output. Its internal high-side P-MOSFET (120mΩ) and low-side N-MOSFET (80mΩ) enable synchronous rectification and 100% duty-cycle operation for dropout scenarios.

Fault management includes cycle-by-cycle current limiting (2.4A peak), thermal shutdown at 160°C with 30°C hysteresis, and hiccup-mode recovery during sustained overload or short-circuit. The device enters sleep mode under light load to sustain 11µA IQ while maintaining regulation via valley-FB sensing.

Key Specifications

Pinout & Package

MP2148GQD-33-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 6-pin layout supports minimal PCB area and high-density integration.

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 ADP2370ACPZ-3.3-R7, MP2148GQD-33-P delivers superior battery runtime due to its 11µA IQ and matches 1A capability in the smallest footprint (1.0×1.5mm vs. 1.6×1.6mm and 2.0×2.0mm), making it optimal for size- and energy-constrained portable electronics.

Availability

MP2148GQD-33-P is available at Aetrix Electronics and suitable for wireless networking cards, portable medical sensors, and smart wearable displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2148GQD-33-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2148 product line targets ultra-compact, ultra-low-power step-down regulation for battery-powered edge devices, emphasizing minimal quiescent current, small-footprint packaging, and robust protection features for unattended operation.

FAQ

What is the recommended input capacitor for MP2148GQD-33-P?

A 10µF X5R/X7R ceramic capacitor placed directly between VIN and GND pins is recommended. For input voltages below 3.3V or high-ripple environments, a second 22µF capacitor improves stability. The capacitor must handle ≥0.5A RMS ripple current and be located within 2mm of pins 2 (GND) and 3 (VIN) to suppress high-frequency noise.

Does MP2148GQD-33-P require external feedback resistors?

No. MP2148GQD-33-P is a fixed-output variant with internal resistor divider set to 3.3V; no external FB resistors are needed. This simplifies layout, eliminates resistor tolerance errors, and reduces bill-of-materials cost compared to adjustable versions like MP2148GQD.

How does the power-good (PG) pin operate on MP2148GQD-33-P?

The PG pin is an open-drain output that pulls low when VOUT falls outside the 85%–90% window (2.805V–2.97V). An external pull-up resistor (100kΩ–500kΩ) to a voltage ≤ VIN is required. PG asserts high after 70µs once regulation is achieved, enabling reliable system power sequencing and reset timing.

Can MP2148GQD-33-P operate with 100% duty cycle?

Yes. The device supports 100% duty-cycle operation, allowing VOUT to remain regulated even when VIN drops to the output voltage level (e.g., 3.3V input → 3.3V output). This extends usable battery life in single-cell Li-ion systems where input voltage decays from 4.2V to 3.3V.

What thermal considerations apply to the QFN-6 package?

The QFN-6 (1.0×1.5mm) package has θJA = 220°C/W on a 4-layer PCB. To maintain TJ < 125°C at 1A load, ensure the exposed thermal pad is soldered to ≥200mm² of inner-layer copper pour with ≥4 thermal vias (0.3mm diameter). Avoid placing components or traces over the pad's thermal relief area.

Is output discharge active during shutdown?

Yes. When EN is pulled low or left floating, the internal 1kΩ discharge MOSFET connects OUT to GND, actively discharging the output capacitor. This prevents residual voltage from interfering with downstream logic states or causing unsafe conditions during hot-swap or maintenance events.

What protection features are integrated into MP2148GQD-33-P?

Integrated protections include cycle-by-cycle current limiting (2.4A peak), thermal shutdown at 160°C with 30°C hysteresis, hiccup-mode short-circuit recovery, undervoltage lockout (2.25V rising threshold), and output discharge. No external components are required to enable these functions.