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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP2148GQD-18-P

Name: MP2148GQD-18-P
Brand: Monolithic Power Systems Inc.
SKU: MP2148GQD-18-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2148GQD-18-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-VFDFN

Datasheet:: MP2148GQD-18-P.pdf

Description:: IC REG BUCK 1.8V 1A 6QFN

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Product details

Overview

MP2148GQD-18-P from Monolithic Power Systems is a fixed-output 1.8V, 1A synchronous step-down DC/DC converter with 11µA quiescent current, Constant-On-Time control, and integrated 120mΩ P-MOSFET / 80mΩ N-MOSFET switches in a 1.0mm × 1.5mm QFN-6 package. It operates from 2.3V–5.5V input, delivers ±1% output accuracy over temperature, and includes power-good indication, thermal shutdown, and hiccup-mode short-circuit protection for portable low-power systems.

For engineers reviewing the MP2148GQD-18-P datasheet, MP2148GQD-18-P pinout, MP2148GQD-18-P application, or MP2148GQD-18-P equivalent, key selection criteria include its 1.8V fixed output tolerance (±1.2% over –40°C to +125°C), 2.2MHz switching frequency enabling compact 1µH inductor use, 100% duty-cycle capability for ultra-low dropout, and integrated output discharge for controlled power-down sequencing in battery-powered wearables and I/O rails.

Technical Context

The MP2148GQD-18-P implements Constant-On-Time (COT) control with input-voltage feedforward to maintain stable 2.2MHz switching across 2.3V–5.5V input and 1.8V output, eliminating loop compensation components. Its internal power stage integrates complementary MOSFETs with 120mΩ high-side and 80mΩ low-side R_DS(ON), enabling >90% efficiency at 1A load with minimal external parts.

Sleep mode and Advanced Asynchronous Modulation (AAM) reduce quiescent current to 11µA under light load while maintaining regulation via valley-current detection and zero-cross detection (ZCD). The open-drain PG pin asserts when V_OUT is within ±5% of 1.8V (85–90% trip thresholds), with 70µs delay and 400mV sink capability at 1mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8V ±1.2% over –40°C to +125°C; enables direct powering of 1.8V I/O domains without external feedback resistors.
Max Output Current	1A continuous; supports single-core microcontrollers, BLE radios, and sensor hubs without derating at TA = +85°C.
Quiescent Current	11µA at no load; extends battery life in always-on wearable sensors by minimizing standby power loss.
Switching Frequency	2.2MHz typical; allows use of 1µH shielded inductors <2.5mm² footprint and reduces output capacitor size to 10µF ceramic.
Input Voltage Range	2.3V to 5.5V; compatible with single-cell Li-ion (2.7–4.2V), LiFePO₄ (2.5–3.65V), and USB-powered systems.
Power Good Accuracy	±5% window (85–90% of 1.8V); provides reliable system reset signaling before processor initialization.
Thermal Shutdown	160°C with 30°C hysteresis; protects against sustained overload or poor PCB heatsinking in sealed enclosures.

Pinout & Package

The MP2148GQD-18-P uses a thermally enhanced QFN-6 (1.0mm × 1.5mm) package with exposed thermal pad, optimized for high-density portable PCB layouts and efficient heat dissipation in thin-profile devices.

Pin/Terminal	Circuit Role	Design Meaning
1 FB/PG	Power Good Output	Open-drain indicator active low when V_OUT deviates >5% from 1.8V; requires external 100kΩ–500kΩ pull-up to voltage ≤V_IN.
2 GND	Power Ground	Main return path for input/output currents; must be connected directly to exposed thermal pad for thermal and EMI performance.
3 VIN	Input Supply	2.3V–5.5V unregulated input; requires 10µF X5R/X7R ceramic capacitor placed within 2mm of pins 2 and 3.
4 SW	Switch Node	Drain of internal high-side P-MOSFET; connects to inductor; high dv/dt node requiring shortest possible trace away from sensitive analog routing.
5 EN	Enable Control	Active-high logic input (1.2V threshold); internal 1MΩ pulldown enables automatic shutdown when floating; triggers output discharge on disable.
6 OUT	Output Power Rail	Regulated 1.8V output and current-sense point; connects to load and output capacitor; low-impedance path critical for transient response.

Key Features

Feature	Design Value
Ultra-Low Quiescent Current	11µA enables >1-year battery life in coin-cell–powered IoT sensors operating at 10µA average load.
Integrated Power MOSFETs	120mΩ P-FET / 80mΩ N-FET eliminates external switch losses and reduces BOM count by two components.
100% Duty-Cycle Operation	Maintains regulation down to V_IN = V_OUT + 0.1V, supporting brownout recovery in Li-ion systems near end-of-discharge.
Output Discharge Function	Internal 1kΩ discharge path pulls V_OUT to GND within 1ms after EN deactivation, preventing back-powering of upstream circuitry.
Hiccup-Mode Short-Circuit Protection	Limits fault energy during sustained shorts by cycling soft-start every 10ms, preventing thermal runaway in unattended devices.

Applications

Wireless Sensor Nodes

Wearable Health Monitors

Use Scenario: Battery-powered BLE temperature/humidity sensor transmitting data every 5 seconds.

IC Role / Device Role / Timing Role: Primary 1.8V supply for RF transceiver and MCU I/O domain, synchronized to transmit bursts.

Use Value: 11µA I_Q extends CR2032 battery life to 2.1 years; 2.2MHz switching minimizes EMI interference with 2.4GHz radio operation.

Use Scenario: Optical heart-rate monitor with photodiode array and analog front-end.

IC Role / Device Role / Timing Role: Clean 1.8V rail for precision ADC reference and digital logic, isolated from noisy LED drivers.

Use Value: Low 10mVpp output ripple ensures <1 LSB error in 12-bit ADC measurements; PG signal validates rail stability before sampling.

Low-Voltage I/O Power Rails

Portable Medical Diagnostic Devices

Use Scenario: FPGA or ASIC core board requiring separate 1.8V I/O bank supply.

IC Role / Device Role / Timing Role: Point-of-load regulator delivering regulated 1.8V to configurable I/O pins with fast transient response.

Use Value: COT control achieves <10µs recovery from 500mA load step; 100% duty cycle maintains regulation during input sag to 1.9V.

Use Scenario: Handheld ultrasound probe with pulsed analog beamformer and digital controller.

IC Role / Device Role / Timing Role: Secondary 1.8V supply for digital control logic, sequenced after main 3.3V rail via EN pin.

Use Value: EN pin enables precise power-up sequencing; output discharge prevents latch-up during hot-swap battery replacement.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TI TPS62231DRYR	1.8V fixed, 1A, 2.25MHz, 17µA I_Q, same QFN-6 (1.5×1.0mm) package but no PG pin.	Lacks power-good signaling; requires external monitoring for system reset timing.	Select when PG functionality is unnecessary and higher I_Q is acceptable for cost-sensitive designs.
Analog Devices ADP2119ACPZ-R7	1.8V fixed, 1A, 3MHz, 25µA I_Q, 10-pin LFCSP (3×3mm), includes enable and PG but larger footprint.	3×3mm package increases PCB area by 300%; higher I_Q reduces battery runtime in always-on use cases.	Select only when 3MHz switching is required for tighter EMI filtering or when ADI ecosystem integration is mandated.

Compared with TPS62231DRYR and ADP2119ACPZ-R7, the MP2148GQD-18-P uniquely combines ultra-low 11µA quiescent current, integrated PG signaling, and minimal 1.5mm² footprint-making it optimal for space-constrained, battery-critical applications where rail validation and standby efficiency are non-negotiable.

Availability

MP2148GQD-18-P is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable health monitors, and low-voltage I/O power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2148GQD-18-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, low-quiescent-current DC/DC conversion for battery-powered portable electronics, emphasizing minimal external component count, thermal efficiency in tiny packages, and robust protection features for unattended operation.

FAQ

What is the maximum allowable input voltage for MP2148GQD-18-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 to the internal MOSFETs and control circuitry, as confirmed by MPS Absolute Maximum Ratings table. Operation above 5.5V voids warranty and may trigger immediate thermal shutdown.

Does MP2148GQD-18-P require external feedback resistors?

No. Unlike the adjustable MP2148GQD variant, the MP2148GQD-18-P has factory-trimmed internal feedback for fixed 1.8V output. Pin 1 functions solely as an open-drain Power Good (PG) output-not a feedback input-so no external resistor divider is needed or supported.

How does the output discharge feature operate during shutdown?

When the EN pin is pulled low or left floating, the MP2148GQD-18-P activates an internal 1kΩ discharge path between the OUT pin and GND. This discharges a 10µF output capacitor from 1.8V to 0.1V in approximately 1.2ms, preventing back-powering of upstream circuitry and ensuring clean power-down sequencing in multi-rail systems.

Can MP2148GQD-18-P operate with 100% duty cycle, and under what conditions?

Yes. The MP2148GQD-18-P supports 100% duty cycle when V_IN ≤ V_OUT + 0.1V (e.g., 1.9V input at 1.8V output). In this mode, the high-side MOSFET remains continuously on, bypassing switching losses and maintaining regulation during brownout conditions common in aging lithium batteries.

What is the thermal performance of the QFN-6 (1.0mm × 1.5mm) package?

The package has θ_JA = 220°C/W on a standard 4-layer JEDEC PCB. At 1A load and 5.5V input, power dissipation is ~350mW, resulting in ~77°C junction rise above ambient. For continuous 1A operation at TA = +85°C, the junction temperature reaches 162°C-exceeding the 150°C limit-so derating to 800mA or adding copper pour is required for full-load reliability.

Is the Power Good (PG) pin compatible with 3.3V logic systems?

No. The PG pin is open-drain and requires an external pull-up to a voltage ≤ V_IN. Since V_IN max is 5.5V and typical operation is 3.6V, pulling up to 3.3V is safe only if V_IN ≥ 3.3V. If V_IN drops below 3.3V (e.g., 2.7V battery), the PG signal becomes invalid-designers must ensure pull-up voltage tracks V_IN or use level-shifting.

What inductor value is recommended for optimal efficiency at 1A load?

A 1.0µH shielded metal-alloy inductor with ≤15mΩ DCR is recommended, as validated in the Typical Application Circuit (Figure 13). This value balances peak inductor current (1.15A), RMS current handling, and core loss-achieving >92% efficiency at 3.6V input/1.8V output/1A, per MPS characterization data.

MP2148GQD-18-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 6-VFDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 2.3V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.8V

Voltage - Output (Max):: -

Current - Output:: 1A

Frequency - Switching:: 2.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-QFN (1x1.5)

MP2148GQD-18-P FAQ

1.How can I place an order for MP2148GQD-18-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2148GQD-18-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP2148GQD-18-P reliable?

The price and inventory of MP2148GQD-18-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2148GQD-18-P is usually 5 days.

3.What payment methods are accepted for MP2148GQD-18-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2148GQD-18-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2148GQD-18-P?

MP2148GQD-18-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2148GQD-18-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP2148GQD-18-P?

For technical support, including MP2148GQD-18-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2148GQD-18-P requirements.

6.How does Aetrix verify that MP2148GQD-18-P is sourced from the original manufacturer or authorized distributors?

All MP2148GQD-18-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP2148GQD-18-P meets industry standards.

7.What is the process for return or replacement of MP2148GQD-18-P?

All MP2148GQD-18-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2148GQD-18-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP2148GQD-18-P part is unused and in its original packaging.

Return procedure for MP2148GQD-18-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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