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Monolithic Power Systems Inc. MPQ2143DJ-AEC1-LF-Z
- Part No.:
- MPQ2143DJ-AEC1-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ2143DJ-AEC1-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,212
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Product details
Overview
MPQ2143DJ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering up to 3A continuous output current from a 2.5V–5.5V input, with 0.6V minimum output voltage, 1.2MHz switching frequency, and 40μA quiescent current. It integrates 80mΩ high-side and 40mΩ low-side MOSFETs and employs constant-on-time (COT) control for fast transient response in automotive power rails.
For engineers reviewing the MPQ2143DJ-AEC1-LF-Z datasheet, MPQ2143DJ-AEC1-LF-Z pinout, MPQ2143DJ-AEC1-LF-Z application, or MPQ2143DJ-AEC1-LF-Z equivalent, key selection criteria include its TSOT23-8 package footprint, ±10% power-good window, hiccup-mode short-circuit protection, and automotive-grade thermal shutdown at 150°C with 30°C hysteresis.
Technical Context
The MPQ2143 uses input-voltage feed-forward COT control to maintain stable 1.2MHz operation across 2.5V–5.5V input and 0.6V–(VIN−0.5V) output ranges, eliminating loop compensation components. Its internal 0.6V reference and ±2% feedback voltage tolerance enable precise regulation under load and line transients.
It implements cycle-by-cycle over-current protection with 4.8A typical high-side current limit, thermal shutdown at 150°C, and soft-start/soft-stop timing of 1.3ms/1ms. The open-drain PG pin features a 500kΩ internal pull-up and ±10% trip thresholds relative to VFB for reliable power sequencing in automotive systems.
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 external LDO pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-rail PMIC subsystems. |
| Quiescent Current | 40μA - enables >10-year battery life in always-on automotive modules like telematics or sensor hubs. |
| Switching Frequency | 1.2MHz ±25% - allows use of compact 1μH inductors and avoids AM radio band interference. |
| Feedback Voltage | 0.600V ±1.5% - sets output via resistor divider; ±2% over full temperature range ensures stable 1.2V or 1.8V core supplies. |
| Power-Good Window | ±10% around VFB - provides robust rail monitoring for microcontroller reset assertion or system boot validation. |
| Thermal Shutdown | 150°C with 30°C hysteresis - prevents latch-up during sustained overload while enabling automatic recovery after cooling. |
Pinout & Package
MPQ2143DJ-AEC1-LF-Z is housed in a thermally enhanced TSOT23-8 package (JEDEC MO-193BA), with 0.65mm pitch, exposed thermal pad, and 100°C/W junction-to-ambient thermal resistance on a 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Power-Good Open-Drain Output | Signals valid regulation via internal 500kΩ pull-up to VIN; sinks current when FB deviates >±10% - used for MCU reset coordination. |
| 2 (VIN) | Main Input Supply | Accepts 2.5V–5.5V unregulated input; requires local 10μF ceramic decoupling to suppress switching noise and UVLO ripple. |
| 3 (SW) | Switch Node | Connects to external inductor; carries high di/dt pulsed current - must be routed short and away from analog traces to avoid coupling. |
| 4 (PGND) | Power Ground Return | High-current return path for MOSFETs and inductor - must be tied to AGND at single point near IC to minimize ground bounce. |
| 5 (OUT) | Output Sense | Direct connection to regulated output node - improves load regulation accuracy by compensating for PCB trace IR drop. |
| 6 (AGND) | Analog Ground Reference | Low-noise reference for feedback comparator and error amplifier - isolated from PGND except at single star point. |
| 7 (FB) | Feedback Input | Monitors output via resistor divider; 10nA bias current enables use of high-value resistors (e.g., 200kΩ/200kΩ for 1.2V). |
| 8 (EN) | Enable Control | Logic-high (>1.2V) enables regulator; internal 1MΩ pull-down allows default disable - used for power sequencing with other rails. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables zero-phase-margin compensation-free design with <10μs load transient response and stable operation with ceramic output capacitors. |
| AEC-Q100 Grade 1 Qualification | Validated for −40°C to +125°C operation with extended reliability testing - suitable for engine control, ADAS camera, and infotainment power stages. |
| Hiccup-Mode Short-Circuit Protection | Disables output, discharges soft-start capacitor, then retries startup - prevents thermal runaway during sustained fault conditions. |
| 100% Duty Cycle in Dropout | Maintains regulation down to VIN = VOUT + dropout loss - critical for brown-out resilience in automotive cold-crank scenarios (e.g., 4.5V → 3.3V). |
| Auto-Discharge at Power-Off | Actively sinks output capacitance through low-side FET during EN deassertion - eliminates residual voltage that could disrupt downstream logic states. |
Applications
| ADAS Camera Module Power | Automotive Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powering 1.2V core supply for image signal processor (ISP) in rear-view camera module operating in −40°C to +105°C under hood environment. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core voltage with fast transient response to burst-mode ISP processing. Use Value: 40μA IQ extends battery backup runtime during vehicle off-state; ±10% PG window validates rail integrity before camera initialization. |
Use Scenario: Generating 1.8V I/O supply for multimedia application processor in head-unit display system with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 1.2MHz fixed frequency to simplify EMI filter design and avoid sensitive RF bands. Use Value: TSOT23-8 footprint saves board space; 80mΩ/40mΩ MOSFETs reduce conduction loss at 2.5A peak load, lowering thermal stress in sealed enclosure. |
| Telematics Control Unit (TCU) Memory Rail | Automotive Gateway Microcontroller Supply |
|
Use Scenario: Delivering 3.3V to LPDDR4 memory interface in cellular-connected TCU requiring low standby current and rapid wake-up. IC Role / Device Role / Timing Role: Always-on buck regulator supporting deep-sleep mode with auto-discharge and hiccup-mode fault containment. Use Value: 1.3ms soft-start prevents inrush-induced brown-out on shared 5V bus; COT architecture maintains regulation during 100mA–2A dynamic load steps. |
Use Scenario: Providing 5V-to-3.3V conversion for ARM Cortex-M7 microcontroller in Zonal ECU with CAN FD and Ethernet interfaces. IC Role / Device Role / Timing Role: Secondary power stage with EN-controlled sequencing aligned to main 5V rail and PG-synchronized reset assertion. Use Value: EN pin's 1.2V logic threshold ensures compatibility with 3.3V GPIO; ±2% VFB tolerance guarantees reliable 3.3V operation across temperature and aging. |
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 improved 2.5V–6V input range, 4A output, lower 25μA IQ, and integrated soft-start capacitor - replaces MPQ2143 per MPS notice. | Supports higher VIN (6V) and wider automotive battery transients; better suited for new designs targeting >3A loads or extended input range. | Select MPQ2179 for new designs requiring longer product lifecycle, higher current headroom, or tighter quiescent current. |
| TPS62130A-Q1 | Texas Instruments AEC-Q100 Grade 1 buck converter with 3A output, 3V–17V input, 2.5MHz switching, and 17μA IQ - different topology (current-mode PWM vs COT). | Better suited for wide-input applications (e.g., 12V systems); lacks auto-discharge and has slower transient response than COT architecture. | Choose TPS62130A-Q1 only if 12V input compatibility or TI ecosystem alignment outweighs need for MPQ2143's fast transient performance and compact footprint. |
Compared with MPQ2143DJ-AEC1-LF-Z, MPQ2179 offers higher current, lower IQ, and extended input range for future-proofing, while TPS62130A-Q1 trades COT speed for broader VIN support and TI-specific toolchain integration - neither matches MPQ2143's exact combination of TSOT23-8 size, 1.2MHz COT, and automotive PG sequencing.
Availability
MPQ2143DJ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and telematics memory supplies requiring stable component supply and AEC-Q100 compliance.
Supply support for MPQ2143DJ-AEC1-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, and global manufacturing partnerships.
The MPQ2143 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for demanding power management in safety-critical vehicle subsystems including ADAS, body electronics, and infotainment.
FAQ
Is MPQ2143DJ-AEC1-LF-Z recommended for new designs?
No - Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ2179" in the datasheet. While fully qualified and supported for existing production, MPQ2143DJ-AEC1-LF-Z is a legacy part superseded by MPQ2179, which offers improved specs and long-term availability assurance.
What is the function of the OUT pin on MPQ2143DJ-AEC1-LF-Z?
The OUT pin is an output voltage sense terminal that connects directly to the regulated output node. It enables remote sensing to compensate for PCB trace voltage drop between the IC and load, improving load regulation accuracy-especially critical in high-current automotive applications where trace resistance can cause significant IR loss.
How does the soft-stop feature operate during EN deactivation?
When EN is pulled low, MPQ2143DJ-AEC1-LF-Z linearly discharges the output capacitor through the low-side MOSFET, transferring energy back to VIN. This prevents floating output voltage but requires careful input capacitance sizing to avoid VIN exceeding 6V absolute maximum rating during discharge-per datasheet Section 13.
Can MPQ2143DJ-AEC1-LF-Z operate with ceramic output capacitors only?
Yes - the MPQ2143 is explicitly designed to be stable with low-ESR ceramic output capacitors. Its COT control architecture eliminates the need for electrolytic or tantalum capacitors, reducing board area and improving reliability in automotive thermal cycling environments.
What is the purpose of the AGND and PGND separation?
AGND serves as the quiet analog reference for the feedback comparator and error amplifier, while PGND carries high di/dt switching currents from the MOSFETs and inductor. Separating them minimizes noise coupling into the regulation loop - they must be joined at a single point near the IC's thermal pad to prevent ground loops and ensure stable feedback operation.
Does MPQ2143DJ-AEC1-LF-Z support forced PWM or DCM modes?
No - MPQ2143DJ-AEC1-LF-Z operates exclusively in constant-on-time (COT) mode with proprietary light-load control that ramps down low-side current gradually to suppress ringing. It does not offer user-selectable PWM/DCM modes or frequency synchronization inputs.
What is the maximum allowable output capacitance for safe soft-stop operation?
Per datasheet Section 13, maximum C2 is constrained by C2 < (C1 × (VIN − VOUT)²) / 36. For example, with VIN = 5V, VOUT = 3.3V, and C1 = 20μF, C2 must be less than 20μF. Exceeding this risks VIN overshoot beyond 6V during soft-stop, potentially damaging upstream components.
MPQ2143DJ-AEC1-LF-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MPQ2143DJ-AEC1-LF-Z FAQ
1.How can I place an order for MPQ2143DJ-AEC1-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2143DJ-AEC1-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 MPQ2143DJ-AEC1-LF-Z reliable?
The price and inventory of MPQ2143DJ-AEC1-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 MPQ2143DJ-AEC1-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ2143DJ-AEC1-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2143DJ-AEC1-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2143DJ-AEC1-LF-Z?
MPQ2143DJ-AEC1-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2143DJ-AEC1-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 MPQ2143DJ-AEC1-LF-Z?
For technical support, including MPQ2143DJ-AEC1-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2143DJ-AEC1-LF-Z requirements.
6.How does Aetrix verify that MPQ2143DJ-AEC1-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2143DJ-AEC1-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 MPQ2143DJ-AEC1-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ2143DJ-AEC1-LF-Z?
All MPQ2143DJ-AEC1-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2143DJ-AEC1-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 MPQ2143DJ-AEC1-LF-Z part is unused and in its original packaging.
Return procedure for MPQ2143DJ-AEC1-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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