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

Monolithic Power Systems Inc. MPQ2128DG-LF-Z

Name: MPQ2128DG-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ2128DG-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2128DG-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TFDFN Exposed Pad

Datasheet:: MPQ2128DG-LF-Z.pdf

Description:: IC REG BUCK ADJ 1A 8QFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,931

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Product details

Overview

MPQ2128DG-LF-Z from Monolithic Power Systems is an AEC-Q100 qualified 3MHz synchronous step-down DC/DC converter with integrated high- and low-side MOSFETs, delivering up to 1A output current from a 2.5V–6V input while regulating down to 0.6V. It features current-mode PWM control, cycle-by-cycle over-current protection, thermal shutdown, and <1μA shutdown current-designed for automotive infotainment power rails and industrial sensor modules.

For engineers reviewing the MPQ2128DG-LF-Z datasheet, MPQ2128DG-LF-Z pinout, MPQ2128DG-LF-Z application, or MPQ2128DG-LF-Z equivalent, key selection criteria include its 3MHz switching frequency enabling compact filter design, AEC-Q100 qualification for automotive use, 0.6V feedback reference for precise low-voltage regulation, and QFN8 (2mm×2mm) package for space-constrained PCB layouts.

Technical Context

The MPQ2128DG-LF-Z implements slope-compensated peak-current-mode PWM control with a fixed 3MHz oscillator, enabling stable operation at duty cycles up to 100% and fast transient response. Its internal PFET (200mΩ R_DS(on)) and NFET (150mΩ R_DS(on)) operate in synchronous rectification mode, eliminating external diode losses and supporting high efficiency (up to 95%) across load ranges.

Protection architecture includes cycle-by-cycle current limiting triggered at ≥1.2A (–40°C to +125°C), thermal shutdown at 150°C with 20°C hysteresis, and short-circuit recovery via oscillator frequency reduction and current limit scaling-ensuring robustness under fault conditions without external circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 6V - supports single-cell Li-ion/Li-polymer battery input and 3.3V/5V rail conversion
Output Voltage Range	0.6V to 6V - regulated by external resistor divider with 0.594V typical FB reference
Switching Frequency	2.2–3.4MHz - enables use of sub-2.2µH inductors and ≤10µF ceramic output capacitors
Max Output Current	1A continuous - limited by thermal design and 2.5W max power dissipation in QFN8 package
Shutdown Current	0.01–1.2μA - ensures ultra-low quiescent power in battery-backed sleep modes
UVLO Threshold	1.75–2.3V rising edge - prevents erratic startup during brown-out conditions
Thermal Shutdown	150°C with 20°C hysteresis - protects die integrity during sustained overload or poor heatsinking

Pinout & Package

MPQ2128DG-LF-Z is housed in a thermally enhanced 2mm × 2mm, 0.5mm pitch QFN-8 package with exposed thermal pad (EP). The EP must be soldered to PCB ground plane for optimal thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
1 (FB)	Feedback Input	Connects to resistor divider tap; regulates output by comparing against 0.594V internal reference
2,4 (GND)	Power Ground	Low-impedance return path for power stage and control logic; must tie to EP
3 (IN)	Input Supply	Accepts 2.5V–6V; requires ≥4.7µF ceramic bypass capacitor placed near pin
5,6 (SW)	Switch Node	Drain connection of internal PFET/NFET; drives external inductor with minimal trace inductance
8 (EN)	Enable Control	Logic-level input: >1.6V = ON, <0.4V = OFF; supports sequencing and standby control

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient operation in automotive power systems
Synchronous rectification	Eliminates external Schottky diode; improves full-load efficiency by ≥8% vs. asynchronous designs
Internal soft-start	100µs controlled ramp-up prevents inrush current and output overshoot at startup
100% duty-cycle capability	Enables dropout operation when V_IN ≈ V_OUT, maintaining regulation down to V_IN = V_OUT + I_LOAD × (R_{DS(on)_PFET} + R_DCR)
Short-circuit recovery	Automatic frequency and current limit reduction during fault, restoring normal operation once V_FB ≥ 0.6V

Applications

Automotive Infotainment Core Rail

Industrial Sensor Node Power

Use Scenario: Powering SoC cores (e.g., ARM Cortex-A series) in head-unit modules requiring clean 1.2V/1.8V at ≤1A from 5V or battery input.

IC Role / Device Role / Timing Role: Primary buck regulator supplying processor core voltage with tight ripple (<20mV_pp) and fast load-step response.

Use Value: 3MHz switching minimizes output capacitance footprint; AEC-Q100 compliance ensures reliability in vehicle cabin environments.

Use Scenario: Providing regulated 3.3V for MEMS accelerometers, temperature sensors, and wireless transceivers in factory-floor IoT nodes.

IC Role / Device Role / Timing Role: Main system power supply with ultra-low shutdown current preserving battery life during multi-week sleep intervals.

Use Value: <1μA shutdown current extends shelf life of sealed battery-powered devices; QFN8 size fits within 5mm² board area budgets.

Portable Medical Monitor Display

Automotive Camera Module Bias

Use Scenario: Generating 5V for OLED display backlight drivers and touch controller ICs in handheld diagnostic tools.

IC Role / Device Role / Timing Role: High-efficiency intermediate rail converter stepping down from Li-ion (3.0–4.2V) to 5V with minimal thermal rise.

Use Value: 95% peak efficiency reduces heat generation near sensitive analog front-ends; thermal shutdown prevents damage during accidental enclosure sealing.

Use Scenario: Supplying 2.8V bias to CMOS image sensors in ADAS rear-view or surround-view cameras.

IC Role / Device Role / Timing Role: Precision low-noise power source with 0.6V feedback reference enabling accurate 2.8V regulation via 1% resistors.

Use Value: Tight FB voltage tolerance (±1.4%) ensures consistent sensor gain calibration across temperature; EN pin allows synchronized power-up with ISP firmware.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62130ARGTR	2.5V–6V input, 3MHz, 3A output; higher current rating but larger 3mm×3mm QFN package	Designed for higher-power applications like FPGA I/O banks; lacks AEC-Q100 qualification	Select when >1A load or higher thermal margin is required; not suitable for automotive production without requalification
RTQ2132BGQW	2.7V–6V input, 2.5MHz, 1A, AEC-Q100 Grade 1; uses voltage-mode control instead of current-mode	Lower EMI due to fixed-frequency voltage-mode architecture; slower transient response than MPQ2128's current-mode loop	Prefer for noise-sensitive analog subsystems where load transients are moderate and EMI filtering is constrained

Compared with TPS62130ARGTR and RTQ2132BGQW, the MPQ2128DG-LF-Z uniquely balances AEC-Q100 compliance, 3MHz switching, and compact QFN8 packaging-making it optimal for space- and qualification-constrained automotive and industrial edge nodes where 1A output suffices.

Availability

MPQ2128DG-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and portable medical monitors requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for MPQ2128DG-LF-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 design centers in the US, China, and Taiwan.

The MPQ2128 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for reliable, high-frequency power conversion in harsh-temperature automotive and industrial environments.

FAQ

What is the minimum recommended input voltage for reliable operation?

The MPQ2128DG-LF-Z has a guaranteed operating input range of 2.5V to 6V. Below 2.5V, UVLO prevents startup; at 2.5V input, maximum output current drops due to reduced headroom across internal FETs and inductor DCR. For 1A continuous output, VIN ≥ 3.0V is recommended to maintain regulation and thermal safety.

How should the exposed thermal pad (EP) be connected on the PCB?

The exposed pad must be soldered directly to a solid copper ground plane using ≥4 thermal vias (0.3mm diameter) spaced evenly beneath the pad. This connection provides primary thermal conduction path and reduces θ_JA from 50°C/W to ≤35°C/W, enabling full 1A operation at +85°C ambient.

Does the MPQ2128DG-LF-Z require an external compensation network?

No external compensation is required. The MPQ2128DG-LF-Z integrates type-II compensation optimized for standard 1.2µH inductors and 10µF ceramic output capacitors. Stability is maintained across all valid output voltages and loads without added components.

Can the MPQ2128DG-LF-Z operate in 100% duty cycle mode?

Yes. When input voltage approaches output voltage, the controller extends main switch ON time beyond one cycle to achieve 100% duty cycle. Regulation continues until V_IN falls below V_OUT + I_LOAD × (R_{DS(on)_PFET} + R_DCR), at which point dropout occurs.

What is the purpose of the 250mV UVLO hysteresis?

The 250mV hysteresis prevents oscillatory startup/shutdown near the 2.1V nominal UVLO threshold. Once enabled above 2.3V, the device remains active until VIN drops below 1.75V-avoiding repeated toggling during marginal input conditions such as battery sag under load.

Is the FB pin internally clamped for overvoltage protection?

No. The FB pin has no internal overvoltage clamp. Exceeding the absolute maximum rating of –0.3V to +6.5V may damage the pin. External Zener diodes or resistor dividers with appropriate voltage limits are required if feedback node is exposed to transients.

How does short-circuit protection behave during sustained fault conditions?

Under sustained short-circuit, the MPQ2128DG-LF-Z reduces switching frequency and lowers PFET current limit to limit power dissipation. Output remains in hiccup mode until the short is removed and FB voltage recovers to ≥0.6V, at which point normal regulation resumes automatically-no reset signal needed.

MPQ2128DG-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-TFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 6V

Current - Output:: 1A

Frequency - Switching:: 2.8MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-QFN (2x2)

MPQ2128DG-LF-Z FAQ

1.How can I place an order for MPQ2128DG-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2128DG-LF-Z 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 MPQ2128DG-LF-Z reliable?

The price and inventory of MPQ2128DG-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2128DG-LF-Z is usually 5 days.

3.What payment methods are accepted for MPQ2128DG-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2128DG-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2128DG-LF-Z?

MPQ2128DG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2128DG-LF-Z 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 MPQ2128DG-LF-Z?

For technical support, including MPQ2128DG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2128DG-LF-Z requirements.

6.How does Aetrix verify that MPQ2128DG-LF-Z is sourced from the original manufacturer or authorized distributors?

All MPQ2128DG-LF-Z 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 MPQ2128DG-LF-Z meets industry standards.

7.What is the process for return or replacement of MPQ2128DG-LF-Z?

All MPQ2128DG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2128DG-LF-Z, 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 MPQ2128DG-LF-Z part is unused and in its original packaging.

Return procedure for MPQ2128DG-LF-Z:

1.Submit a request within 90 days.

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

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