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

Monolithic Power Systems Inc. MPQ2143DJ-Z

Name: MPQ2143DJ-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ2143DJ-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2143DJ-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-8 Thin, TSOT-23-8

Datasheet:: MPQ2143DJ-Z.pdf

Description:: IC REG BUCK ADJ 3A TSOT23-8

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Product details

Overview

MPQ2143DJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 80mΩ high-side and 40mΩ low-side MOSFETs, delivering up to 3A continuous output current from a 2.5V–5.5V input, regulating output as low as 0.6V using constant-on-time (COT) control, and featuring EN, Power-Good, and AEC-Q100 Grade 1 qualification for automotive power rails in infotainment and ADAS subsystems.

For engineers reviewing the MPQ2143DJ-Z datasheet, MPQ2143DJ-Z pinout, MPQ2143DJ-Z application, or MPQ2143DJ-Z equivalent, this device supports fast transient response in compact battery-powered systems, requires minimal external components (single inductor + two capacitors), integrates cycle-by-cycle over-current protection and thermal shutdown, and enables precise power sequencing via EN and open-drain PG signals.

Technical Context

The MPQ2143DJ-Z implements constant-on-time (COT) control with input-voltage feed-forward to maintain stable ~1.2MHz switching frequency across its full 2.5V–5.5V input range and 0.6V–(VIN−0.5V) output range. Its internal power stage uses complementary PCH/NCH MOSFETs with 80mΩ/40mΩ R_DS(on), enabling high efficiency at light loads via proprietary low-I_Q operation (40μA quiescent current) and controlled LS-FET current ramp-down to suppress switching-node ringing.

Functional safety features include ±10% power-good window referenced to 0.6V feedback voltage, hiccup-mode short-circuit protection triggered at 4.8A peak HS-FET current, 1.3ms soft-start with linear V_REF ramp, and auto-discharge during shutdown. The TSOT23-8 package supports thermal resistance θ_JA = 100°C/W on a 4-layer PCB per JESD51-7.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 5.5V - supports single-cell Li-ion, USB PD, and automotive 3.3V/5V rails without pre-regulation.
Output Current	3A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-core microcontrollers.
Feedback Voltage	0.600V ±1.5% - sets precise output regulation; enables 0.6V minimum V_OUT for modern low-voltage logic.
Switching Frequency	1.2MHz ±20% - allows use of small 1.0μH inductors and reduces EMI filter size in space-constrained layouts.
Quiescent Current	40μA - extends battery life in always-on monitoring circuits and low-power sleep modes.
Thermal Shutdown	150°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking.
Power-Good Accuracy	±10% window around 0.6V - ensures reliable system reset and sequencing coordination with host processors.

Pinout & Package

MPQ2143DJ-Z is housed in a thermally enhanced TSOT23-8 package (JEDEC MO-193BA), measuring 2.9mm × 1.6mm × 0.85mm, with exposed pad for improved heat dissipation and θ_JA = 100°C/W on standard 4-layer PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 - PG	Open-drain Power-Good indicator	Pulled high to VIN via 500kΩ internal resistor when FB is within ±10% of 0.6V; sinks current when out-of-regulation - enables safe power sequencing and fault detection.
2 - VIN	Main input supply	Accepts 2.5V–5.5V unregulated input; requires local 10μF ceramic capacitor to absorb high-frequency switching current and suppress input ripple.
3 - SW	Switch node	Connects to external inductor; carries high di/dt pulsed current - must be routed short and away from sensitive analog traces (FB, AGND) to avoid noise coupling.
4 - PGND	Power ground return	Carries high-current return path for VIN and SW - must be tied directly to input/output capacitor grounds with low-inductance connection to minimize voltage spikes.
5 - OUT	Output voltage sense	Provides Kelvin sensing of regulated output voltage - improves load regulation accuracy by rejecting trace IR drop between IC and load.
6 - AGND	Analog reference ground	Isolated ground reference for internal error amplifier and feedback circuitry - must be connected to PGND at single point near IC to prevent noise injection into control loop.
7 - FB	Feedback input	Monitors resistive divider output; regulates V_OUT to 0.6V - typical R1=200kΩ/R2=200kΩ sets 1.2V output for DDR memory or core logic rails.
8 - EN	Enable control	Active-high logic input (1.2V threshold); internal 1MΩ pull-down - allows precise power-up timing, standby mode entry, and system-level fault isolation.

Key Features

Feature	Design Value
Constant-On-Time (COT) Control	Delivers <5μs load transient response without external compensation components - simplifies design for dynamic FPGA/DSP loads.
Integrated Power MOSFETs	80mΩ high-side + 40mΩ low-side R_DS(on) - eliminates external FETs and drivers, reducing BOM count and board area by >30% vs discrete solutions.
100% Duty Cycle Operation	Supports dropout mode down to V_IN − V_OUT ≈ 0V - maintains regulation during brownout conditions in battery-powered systems.
Auto-Discharge at Power-Off	Actively discharges output capacitor through internal path when EN is deasserted - prevents floating voltage on downstream logic during shutdown.
AEC-Q100 Grade 1 Qualification	Rated for −40°C to +125°C junction temperature - validated for under-hood automotive applications including telematics and camera modules.

Applications

Automotive Infotainment Power

Portable Medical Sensor Hub

Use Scenario: Powering 1.2V DDR3L memory and 1.8V I/O in vehicle head units with wide input voltage variation (cold crank to load dump).

IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, sequenced, and monitored power rails with PG signaling to SoC.

Use Value: AEC-Q100 qualification ensures reliability across automotive temperature and vibration profiles; COT control maintains regulation during rapid engine start transients.

Use Scenario: Supplying 3.3V sensor interface and 1.8V microcontroller core in handheld ECG monitors powered by coin-cell or Li-poly batteries.

IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling >100-hour battery life via 40μA I_Q and light-load optimization.

Use Value: 100% duty cycle operation sustains output during battery voltage decay below 3.3V; TSOT23-8 footprint minimizes PCB real estate in ultra-thin enclosures.

Industrial PLC I/O Module

Wireless Edge Node Power

Use Scenario: Generating isolated 5V and 3.3V rails for digital I/O expansion cards operating in factory-floor environments with EMI and thermal stress.

IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage delivering clean, well-regulated power with hiccup-mode fault recovery.

Use Value: Thermal shutdown with 30°C hysteresis prevents latch-up during ambient temperature spikes; low-ESR ceramic capacitor compatibility ensures stable operation in noisy industrial settings.

Use Scenario: Powering LoRaWAN or BLE radio + ARM Cortex-M MCU in battery-operated smart agriculture sensors deployed outdoors for years.

IC Role / Device Role / Timing Role: Primary power management IC managing startup sequencing, brownout response, and graceful shutdown via EN/PG.

Use Value: Soft-start (1.3ms) prevents inrush current tripping source protection; auto-discharge avoids residual voltage causing unintended wake-up in deep-sleep states.

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
MPQ2179	Successor device with same pinout, 4A output, lower 25μA I_Q, and enhanced thermal performance (θ_JA = 85°C/W).	Recommended for new designs requiring higher current headroom or extended battery life; supports identical layout with no redesign.	Select MPQ2179 when upgrading from MPQ2143DJ-Z to improve efficiency at light loads or increase output capability without changing PCB.
TPS62864A	TI part with 4A rating, 1.8MHz f_SW, 18μA I_Q, but requires external compensation and lacks AEC-Q100 qualification.	Suitable for non-automotive consumer or industrial applications where highest light-load efficiency is critical and qualification is not required.	Choose TPS62864A only if AEC-Q100 is unnecessary and system-level EMI filtering can accommodate higher switching frequency.

Compared with MPQ2143DJ-Z, MPQ2179 offers direct upgrade path with higher current, lower I_Q, and better thermal metrics while maintaining pin and function compatibility; TPS62864A delivers superior quiescent performance but sacrifices automotive qualification and adds design complexity via external loop compensation.

Availability

MPQ2143DJ-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical instrumentation, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for MPQ2143DJ-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 leadership in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ2143 belongs to MPS's automotive-grade monolithic buck converter product line, designed specifically for AEC-Q100-compliant power delivery in safety-critical subsystems such as ADAS cameras, body control modules, and infotainment head units.

FAQ

What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MPQ2143DJ-Z?

This designation indicates that Monolithic Power Systems has released a functional successor (MPQ2179) with improved specifications and recommends it for all new projects. MPQ2143DJ-Z remains fully supported for existing designs, with no announced obsolescence date, and continues to be manufactured and stocked by authorized distributors including Aetrix Electronics.

Can MPQ2143DJ-Z operate with ceramic output capacitors only?

Yes - the MPQ2143DJ-Z is explicitly characterized and stabilized with low-ESR ceramic capacitors. Its COT control architecture eliminates the need for electrolytic or tantalum capacitors, and the datasheet confirms stable operation with 22μF X5R/X7R ceramics, reducing board area and improving reliability over temperature.

How does the Power-Good (PG) pin behave during startup and fault conditions?

The PG pin is an open-drain output with internal 500kΩ pull-up to VIN. It asserts high when FB voltage is within ±10% of 0.6V (i.e., 0.54V–0.66V) and pulls low otherwise. During startup, PG remains low until V_OUT settles within regulation after the 1.3ms soft-start period; during over-current or thermal faults, PG deasserts immediately to signal loss of regulation.

What is the minimum off-time specification, and why does it matter?

The MPQ2143DJ-Z enforces a fixed minimum off-time of 50ns to prevent inductor current runaway during large load transients. This parameter ensures controllable current limiting and stable operation at high duty cycles (e.g., V_OUT = 3.3V from 3.6V input), but does not affect steady-state regulation or efficiency under normal operating conditions.

Does MPQ2143DJ-Z support forced PWM or DCM mode selection?

No - the MPQ2143DJ-Z operates exclusively in automatic mode, transitioning seamlessly between COT-controlled continuous conduction mode (CCM) and a proprietary light-load scheme that ramps down low-side FET current to suppress ringing. There is no pin or register to force fixed-frequency PWM or disable discontinuous behavior.

How is thermal performance affected by PCB layout in TSOT23-8 package?

Thermal resistance θ_JA = 100°C/W assumes a JEDEC-standard 4-layer PCB with 2oz copper, thermal vias under the exposed pad, and proper copper pour on inner layers. Without thermal vias or adequate copper area, θ_JA may exceed 150°C/W, reducing maximum sustainable output current by up to 40% at ambient temperatures above 60°C.

What happens during soft-stop when EN is pulled low?

When EN is deasserted, the MPQ2143DJ-Z linearly discharges its internal reference voltage, causing V_OUT to ramp down. Energy stored in the output capacitor transfers back to VIN, potentially raising input voltage. If C_OUT is large and C_IN is small, VIN may exceed 6V absolute maximum - the datasheet provides design equations to limit C_OUT based on C_IN and V_IN/V_OUT ratio.

MPQ2143DJ-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: SOT-23-8 Thin, TSOT-23-8

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 5.5V

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

Voltage - Output (Max):: 5V

Current - Output:: 3A

Frequency - Switching:: 1.2MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-8

MPQ2143DJ-Z FAQ

1.How can I place an order for MPQ2143DJ-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2143DJ-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 MPQ2143DJ-Z reliable?

The price and inventory of MPQ2143DJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2143DJ-Z is usually 5 days.

3.What payment methods are accepted for MPQ2143DJ-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2143DJ-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2143DJ-Z?

MPQ2143DJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2143DJ-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 MPQ2143DJ-Z?

For technical support, including MPQ2143DJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2143DJ-Z requirements.

6.How does Aetrix verify that MPQ2143DJ-Z is sourced from the original manufacturer or authorized distributors?

All MPQ2143DJ-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 MPQ2143DJ-Z meets industry standards.

7.What is the process for return or replacement of MPQ2143DJ-Z?

All MPQ2143DJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2143DJ-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 MPQ2143DJ-Z part is unused and in its original packaging.

Return procedure for MPQ2143DJ-Z:

1.Submit a request within 90 days.

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

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