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Monolithic Power Systems Inc. MP2143DJ-LF-Z
- Part No.:
- MP2143DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2143DJ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,261
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Product details
Overview
MP2143DJ-LF-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 down to 0.6V, featuring constant-on-time (COT) control, 40μA quiescent current, and 1.2MHz switching frequency - used in FPGA core power, smartphone PMIC rails, and portable instrument I/O supplies.
For engineers reviewing the MP2143DJ-LF-Z datasheet, MP2143DJ-LF-Z pinout, MP2143DJ-LF-Z application, or MP2143DJ-LF-Z equivalent, key selection criteria include COT transient response performance, TSOT23-8 thermal dissipation limits, EN/PG sequencing capability, and compatibility with low-ESR ceramic output capacitors in space-constrained battery-powered designs.
Technical Context
The MP2143DJ-LF-Z implements constant-on-time 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. Its internal power stage integrates complementary P-channel and N-channel MOSFETs with 80mΩ/40mΩ RDS(on), enabling high efficiency at light loads via proprietary DCM management.
It features cycle-by-cycle over-current protection with 4.8A high-side current limit, hiccup-mode short-circuit recovery, ±10% power-good window referenced to 0.6V feedback voltage, and 1.3ms soft-start with auto-discharge on shutdown - all coordinated through a single-polarity EN control input and open-drain PG indicator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB VBUS, and regulated 3.3V/5V rails without pre-regulation. |
| Output Voltage Range | 0.6V to (VIN − 0.5V) - enables direct core supply for modern low-voltage FPGAs and application processors. |
| Max Output Current | 3A continuous - sustained under thermal limits in TSOT23-8 with proper PCB copper area and airflow. |
| Quiescent Current | 40μA - enables >100-hour standby in always-on IoT sensors without battery drain penalty. |
| Switching Frequency | 1.2MHz ±25% - allows compact 1μH inductors and fits within EMI-sensitive bands while maintaining COT loop stability. |
| Feedback Reference | 0.600V ±1.5% - sets output accuracy; enables precise 1.2V, 1.8V, and 3.3V rails using standard 1% resistor dividers. |
| Power-Good Threshold | ±10% of 0.6V (0.54V–0.66V) - provides reliable system reset signaling with 110μs delay and 500kΩ internal pull-up. |
Pinout & Package
MP2143DJ-LF-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), with exposed thermal pad connected to PGND for improved heat dissipation in high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain Power-Good indicator | Pulled to VIN via 500kΩ internal resistor when FB is within ±10% of 0.6V; sinks >1mA at 0.4V for MCU reset assertion. |
| 2 - VIN | Main input supply | Accepts 2.5V–5.5V unregulated input; requires local 10μF ceramic decoupling placed adjacent to pins 2 and 4. |
| 3 - SW | Switch node | Connects to external inductor; carries high di/dt pulses - must be routed short and away from FB/AGND traces. |
| 4 - PGND | Power ground return | High-current return path for HS-FET, LS-FET, and input capacitor; tied to thermal pad for thermal conduction. |
| 5 - OUT | Output voltage sense | Direct connection to output rail; used internally for current sensing and hiccup-mode recovery timing. |
| 6 - AGND | Analog reference ground | Low-noise ground for feedback amplifier and reference circuitry; must be star-connected to PGND at single point. |
| 7 - FB | Feedback input | Resistor divider midpoint; senses output voltage with 10nA bias current - enables high-impedance divider design. |
| 8 - EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pulldown allows default-disable when floating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <5μs load transient response without external compensation components - critical for burst-mode processor cores. |
| Integrated Power MOSFETs | 80mΩ PCH + 40mΩ NCH switches eliminate external gate drivers and reduce BOM count in ultra-compact layouts. |
| Light-Load Efficiency Mode | Proprietary LS-FET current ramp-down avoids switching-node ringing and maintains >85% efficiency at 10mA load. |
| Robust Protection Suite | Cycle-by-cycle OCP, thermal shutdown (150°C), hiccup-mode SCP, and auto-discharge ensure safe fault recovery in embedded systems. |
| Sequencing Support | Dedicated EN and PG pins enable precise power-up/down ordering with other rails in multi-rail PMIC architectures. |
Applications
| FPGA Core Supply | Smartphone Application Processor Rail |
|---|---|
|
Use Scenario: Powers 1.2V core voltage of Xilinx Artix-7 or Intel MAX 10 FPGA during configuration and active logic operation. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.2V/2.5A with fast transient response to logic switching events. Use Value: COT control reduces output voltage deviation to <15mV during 2A step-load transients, preventing configuration errors or timing violations. |
Use Scenario: Supplies 1.8V I/O rail for Qualcomm Snapdragon SoC in handheld devices with dynamic voltage scaling. IC Role / Device Role / Timing Role: Secondary buck converter with EN-controlled sequencing after main 3.3V PMIC rail powers up. Use Value: 40μA IQ extends battery life in sleep mode; PG signal synchronizes SoC wake-up sequence with rail stabilization. |
| Portable Medical Instrument Sensor Bias | Wireless Network Card Baseband Power |
|
Use Scenario: Generates stable 3.3V analog supply for precision ADCs and op-amps in handheld ECG monitors. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with AGND isolation and ceramic-capacitor compatibility. Use Value: Stable 0.6V reference and ±1.5% FB tolerance ensure <0.5% output drift over temperature, preserving measurement accuracy. |
Use Scenario: Provides 1.2V digital core voltage for Wi-Fi 6 baseband ICs in M.2-format network cards. IC Role / Device Role / Timing Role: High-frequency (1.2MHz) buck converter minimizing inductor size while meeting PCIe slot thermal constraints. Use Value: TSOT23-8 footprint and 1.2MHz operation allow use of 1.0μH/2.5mm × 2.0mm inductor - reducing card height by 0.4mm vs. 500kHz alternatives. |
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 |
|---|---|---|---|
| RT6220BGQW | Fixed 1.2MHz frequency, no COT; 50μA IQ; requires external compensation. | Lacks PG and EN pins; less suitable for sequenced multi-rail systems. | Prefer when cost sensitivity outweighs need for fast transient response or power sequencing. |
| TPS62231DRVR | VIN range 2.05V–6.0V; 1.6MHz fixed freq; 25μA IQ; no hiccup-mode SCP. | Higher switching frequency enables smaller inductors but increases EMI risk near 2.4GHz ISM band. | Choose when ultra-low IQ and minimal solution size are prioritized over robust short-circuit recovery. |
Compared with RT6220BGQW and TPS62231DRVR, MP2143DJ-LF-Z uniquely combines COT transient performance, integrated PG/EN sequencing, and hiccup-mode fault recovery in a TSOT23-8 package - making it optimal for space-constrained, multi-rail embedded systems requiring deterministic power-up behavior and field reliability.
Availability
MP2143DJ-LF-Z is available at Aetrix Electronics and suitable for FPGA power delivery, smartphone PMIC subsystems, and portable medical instrumentation requiring stable component supply across extended production cycles.
Supply support for MP2143DJ-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, headquartered in Kirkland, WA, with global design and support centers.
The MP2143 belongs to MPS's COT-based synchronous buck converter product line, engineered specifically for high-efficiency, low-noise, and ultra-compact power delivery in battery-powered and thermally constrained portable electronics.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2143DJ-LF-Z is stable with ≥10μF ceramic output capacitance (X5R/X7R dielectric). For 3A loads, 22μF is recommended to limit output ripple to <20mV peak-to-peak. Equivalent series resistance (ESR) must be ≤10mΩ; higher ESR may cause instability or excessive ripple.
Can the MP2143DJ-LF-Z operate in dropout mode?
Yes - it supports 100% duty cycle operation when input voltage approaches the output voltage, maintaining regulation down to VIN = VOUT + 0.5V. This enables seamless transition during battery discharge in single-cell Li-ion systems where VIN drops from 4.2V to 3.0V.
How does the power-good (PG) pin behave during startup and fault conditions?
PG remains low until FB reaches 0.54V (−10%), then pulls high to VIN via internal 500kΩ resistor. If FB falls below 0.54V or exceeds 0.66V (±10%), PG is actively pulled low. During thermal shutdown or over-current hiccup, PG asserts low within 110μs and stays low until regulation resumes.
What is the maximum allowable junction temperature and corresponding derating guidance?
The absolute maximum junction temperature is 150°C, with thermal shutdown activating at 150°C ±5°C and hysteresis of 30°C. In TSOT23-8 with 2oz copper and 2cm² thermal pad area, full 3A output is sustainable up to 85°C ambient; above that, current must be linearly derated to maintain TJ ≤ 125°C.
Is an external soft-start capacitor required?
No - MP2143DJ-LF-Z includes internal soft-start with typical 1.3ms ramp time. An external capacitor is not supported or needed. The soft-start voltage ramps linearly from 0V to 0.6V, ensuring monotonic VOUT rise without overshoot even with large output capacitance.
Does the device support forced PWM or discontinuous conduction mode (DCM)?
It operates in automatic DCM at light loads using proprietary LS-FET current ramp-down - no external mode-select pin. Forced PWM is not supported; however, the COT architecture inherently maintains high efficiency (>85%) from 10mA to 3A without audible switching noise or subharmonic oscillation.
What layout practices are critical for EMI and thermal performance?
Place input capacitor (10μF ceramic) directly between VIN (pin 2) and PGND (pin 4); route SW (pin 3) short and wide to inductor; isolate FB (pin 7) and AGND (pin 6) from noisy PGND paths; connect thermal pad to solid PGND plane with ≥4 thermal vias; keep feedback resistors adjacent to FB pin.
MP2143DJ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2143DJ-LF-Z FAQ
1.How can I place an order for MP2143DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2143DJ-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 MP2143DJ-LF-Z reliable?
The price and inventory of MP2143DJ-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 MP2143DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2143DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2143DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2143DJ-LF-Z?
MP2143DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2143DJ-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 MP2143DJ-LF-Z?
For technical support, including MP2143DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2143DJ-LF-Z requirements.
6.How does Aetrix verify that MP2143DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2143DJ-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 MP2143DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2143DJ-LF-Z?
All MP2143DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2143DJ-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 MP2143DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP2143DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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