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Monolithic Power Systems Inc. MPQ2143DJ-LF-P
- Part No.:
- MPQ2143DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ2143DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
MPQ2143DJ-LF-P from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter 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 down to 0.6V with constant-on-time (COT) control, and featuring AEC-Q100 Grade 1 qualification for automotive power rails in infotainment and ADAS subsystems.
For engineers reviewing the MPQ2143DJ-LF-P datasheet, MPQ2143DJ-LF-P pinout, MPQ2143DJ-LF-P application, or MPQ2143DJ-LF-P equivalent, key selection criteria include its 40μA quiescent current, 1.2MHz switching frequency with ±25% variation over temperature, cycle-by-cycle current limiting, power-good indicator with ±10% trip window, and TSOT23-8 package compatibility with space-constrained portable and automotive PCB layouts.
Technical Context
The MPQ2143DJ-LF-P implements constant-on-time (COT) control with input-voltage feed-forward to maintain stable 1.2MHz switching across its 2.5V–5.5V input range and 0.6V–(VIN−0.5V) output range, enabling fast transient response without external compensation. Its internal 0.6V reference and feedback comparator drive a PWM logic block that controls the high-side PFET and low-side NFET switches.
Protection architecture includes cycle-by-cycle current limiting (4.8A typ at +25°C), thermal shutdown at 150°C with 30°C hysteresis, hiccup-mode short-circuit recovery, and under-voltage lockout with 2.2V rising threshold and 150mV hysteresis - all implemented in analog circuitry without microcontroller dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB-powered, and automotive 3.3V/5V rail generation without pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-core application processors in portable systems. |
| Quiescent Current | 40μA - enables >100-hour battery runtime in always-on sensor nodes or low-power MCU sleep modes. |
| Switching Frequency | 1.2MHz ±25% - allows use of compact 1μH inductors and fits within EMI-sensitive bands while maintaining light-load efficiency. |
| Feedback Reference | 0.600V ±1.5% - sets precise output voltage via external resistor divider; ±2% tolerance over −40°C to +125°C ensures stability in automotive environments. |
| Power-Good Accuracy | ±10% window around regulation - provides reliable system-level power sequencing signal for SoC reset management. |
| Thermal Shutdown | 150°C junction temperature - protects die during sustained overload or poor PCB thermal design; 30°C hysteresis prevents oscillation. |
Pinout & Package
MPQ2143DJ-LF-P is housed in a thermally enhanced TSOT23-8 package (3.0mm × 3.0mm × 0.9mm), optimized for high-power density in space-constrained applications. The exposed pad (Pin 4 PGND) must be soldered to a thermal pad on the PCB for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain Power-Good Indicator | Pulled to VIN via internal 500kΩ resistor when FB is within ±10% of 0.6V; sinks current to GND when out-of-regulation - used for system power sequencing and fault reporting. |
| 2 (VIN) | Main Input Supply | Accepts 2.5V–5.5V unregulated input; requires local 10μF ceramic decoupling capacitor placed adjacent to minimize high-frequency switching noise injection. |
| 3 (SW) | Switch Node | Connects to external inductor; carries high di/dt square-wave current - must be routed short and away from sensitive analog traces like FB and AGND. |
| 4 (PGND) | Power Ground | High-current return path for VIN and SW; must be connected directly to thermal pad and separated from AGND except at single-point star ground to avoid noise coupling. |
| 5 (OUT) | Output Sense | Direct connection to output capacitor positive terminal - improves load regulation by compensating for PCB trace resistance between IC and load. |
| 6 (AGND) | Analog Ground Reference | Reference for internal error amplifier and feedback comparator; must be tied to PGND at one point only, near the IC, to prevent digital switching noise from corrupting regulation accuracy. |
| 7 (FB) | Feedback Input | Monitors output voltage via external resistor divider; high-impedance (10nA bias) node requiring short trace routing and shielding from SW and EN noise sources. |
| 8 (EN) | Enable Control | Logic-high (>1.2V) enables operation; internal 1MΩ pull-down allows default-disable if left floating - used for controlled power-up/down sequencing in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10μs load transient response without external loop compensation components - critical for FPGA core voltage tracking during burst-mode operation. |
| AEC-Q100 Grade 1 Qualification | Validated for −40°C to +125°C operation with full electrical testing per automotive stress requirements - suitable for front-end camera modules and body control units. |
| 100% Duty Cycle Operation | Permits dropout mode where VOUT ≈ VIN - maintains regulation during brown-out conditions in battery-powered systems without forcing premature shutdown. |
| Auto-Discharge at Power-Off | Actively discharges output capacitor through internal NFET when EN is deasserted - prevents residual voltage from interfering with downstream logic state retention or hot-plug detection. |
| Stable with Low-ESR Ceramic Capacitors | Eliminates need for tantalum or electrolytic output caps - reduces board area, improves reliability, and avoids aging-related capacitance drift in long-life automotive deployments. |
Applications
| Automotive Infotainment Power | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Powering 1.2V core and 1.8V I/O rails for SoCs in head-unit displays and telematics control units. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing regulated, sequenced, and monitored power with AEC-Q100 compliance. Use Value: Enables single-chip solution for dual-rail generation with independent PG signaling, reducing BOM count versus discrete LDO + buck combinations. |
Use Scenario: Supplying 3.3V and 2.5V rails for ADCs, wireless transceivers, and microcontrollers in handheld ultrasound and glucose monitors. IC Role / Device Role / Timing Role: High-efficiency, low-IQ step-down converter supporting battery life extension and thermal management in sealed enclosures. Use Value: 40μA quiescent current extends usable battery life beyond 120 hours in standby mode while maintaining fast wake-up response via COT architecture. |
| Industrial IoT Edge Sensor Hub | Wireless Network Interface Card |
|
Use Scenario: Generating 1.0V and 1.2V supplies for ARM Cortex-M7 microcontrollers and MEMS sensor interfaces in vibration-monitoring gateways. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter operating reliably across wide ambient temperatures with minimal external components. Use Value: TSOT23-8 footprint and integrated MOSFETs reduce total solution size by >40% compared to controller + external FET designs, easing layout in dense sensor modules. |
Use Scenario: Providing 1.8V and 3.3V power to Wi-Fi 6/Bluetooth SoCs and RF front-ends on PCIe-based network cards. IC Role / Device Role / Timing Role: Fast-transient buck regulator with EN-controlled sequencing to meet PCIe power management specification timing windows. Use Value: 1.3ms soft-start time prevents inrush current violations during hot-plug insertion, while PG signal synchronizes firmware initialization with rail stabilization. |
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 30μA IQ, 2.2MHz fSW, and extended 2.7V–6V input range; pin-compatible but requires updated layout for higher-frequency EMI filtering. | Targeted for next-gen automotive ADAS cameras where higher switching frequency enables smaller magnetics and tighter EMI compliance. | Select MPQ2179 for new designs requiring lower quiescent current, higher frequency, or wider input range - MPQ2143DJ-LF-P remains viable for legacy production continuity. |
| TPS62864DLCR | TI part with 15μA IQ, 4A output, and DCS-Control topology; different pinout (WSON-10), no integrated PG, and requires external resistors for VOUT setting. | Better suited for ultra-low-power industrial controllers needing longer battery life, but lacks AEC-Q100 qualification and automotive temperature support. | Choose TPS62864DLCR only if AEC-Q100 is not required and sub-20μA IQ is critical; MPQ2143DJ-LF-P offers automotive-grade reliability and integrated PG in smaller footprint. |
Compared with MPQ2179, MPQ2143DJ-LF-P trades higher quiescent current and lower switching frequency for proven automotive qualification and simpler EMI filter design; versus TPS62864DLCR, it delivers AEC-Q100 compliance and integrated power-good at the cost of slightly higher IQ, making it the preferred choice for safety-critical automotive subsystems.
Availability
MPQ2143DJ-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical instrumentation, and industrial IoT edge sensor hubs requiring stable component supply with guaranteed AEC-Q100 Grade 1 qualification and long-term lifecycle support.
Supply support for MPQ2143DJ-LF-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 management 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 delivery in infotainment, ADAS, and body electronics where small size, thermal robustness, and AEC-Q100 compliance are mandatory.
FAQ
Is MPQ2143DJ-LF-P recommended for new designs?
No - Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ2179" in the datasheet revision history and product description. MPQ2143DJ-LF-P remains supported for existing production and legacy program continuity, but MPQ2179 is the designated replacement with improved specifications including lower quiescent current and higher switching frequency.
What is the function of the OUT pin on MPQ2143DJ-LF-P?
The OUT pin is an output voltage sense terminal that connects directly to the positive terminal of the output capacitor. It provides remote sensing capability to compensate for voltage drop across PCB traces between the IC and load, improving load regulation accuracy - especially critical in high-current or long-trace applications such as automotive display power rails.
How does the soft-stop feature operate during shutdown?
When disabled via the EN pin, MPQ2143DJ-LF-P activates soft-stop by linearly ramping down its internal reference voltage, causing the output capacitor to discharge through the low-side MOSFET into the input rail. This prevents abrupt voltage collapse but requires careful input capacitance sizing to avoid VIN exceeding its 6V absolute maximum rating during energy transfer.
Can MPQ2143DJ-LF-P operate with 100% duty cycle?
Yes - the MPQ2143DJ-LF-P supports 100% duty cycle operation, allowing the output voltage to track the input voltage closely during dropout conditions. This feature maintains regulation even when VIN drops near VOUT, extending usable battery life in single-cell Li-ion systems without triggering premature UVLO shutdown.
What is the thermal resistance (θJA) of the TSOT23-8 package?
The junction-to-ambient thermal resistance (θJA) for the TSOT23-8 package is 100°C/W, measured per JESD51-7 on a 4-layer PCB. This value assumes proper thermal pad soldering and adequate copper pour; actual θJA will improve significantly with enhanced PCB thermal design, such as internal ground plane layers and thermal vias under the exposed pad.
Does MPQ2143DJ-LF-P require external compensation components?
No - the constant-on-time (COT) control architecture eliminates the need for external compensation networks. Stability is inherently achieved through input-voltage feed-forward and fixed minimum off-time (50ns), allowing reliable operation with only the recommended ceramic input and output capacitors and a single inductor.
What protection features are integrated into MPQ2143DJ-LF-P?
MPQ2143DJ-LF-P integrates cycle-by-cycle over-current protection (4.8A typical), thermal shutdown at 150°C with 30°C hysteresis, under-voltage lockout (2.2V rising threshold), short-circuit protection with hiccup-mode recovery, and auto-discharge at power-off - all implemented in hardware without software dependency.
MPQ2143DJ-LF-P 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-LF-P FAQ
1.How can I place an order for MPQ2143DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2143DJ-LF-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 MPQ2143DJ-LF-P reliable?
The price and inventory of MPQ2143DJ-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2143DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MPQ2143DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2143DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2143DJ-LF-P?
MPQ2143DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2143DJ-LF-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 MPQ2143DJ-LF-P?
For technical support, including MPQ2143DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2143DJ-LF-P requirements.
6.How does Aetrix verify that MPQ2143DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MPQ2143DJ-LF-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 MPQ2143DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MPQ2143DJ-LF-P?
All MPQ2143DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2143DJ-LF-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 MPQ2143DJ-LF-P part is unused and in its original packaging.
Return procedure for MPQ2143DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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