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Texas Instruments LM20143QMHX/NOPB
- Part No.:
- LM20143QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20143QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
LM20143QMHX/NOPB from Texas Instruments is a 3-A synchronous buck regulator with peak current mode control, adjustable switching frequency (500 kHz–1.5 MHz), 0.8-V minimum output voltage, and integrated 32-mΩ high-side/36-mΩ low-side FETs-designed for point-of-load regulation in FPGA, DSP, and microprocessor core supplies.
For engineers reviewing the LM20143QMHX/NOPB datasheet, LM20143QMHX/NOPB pinout, LM20143QMHX/NOPB application, or LM20143QMHX/NOPB equivalent, key selection considerations include pre-bias startup capability, precision enable threshold (1.18 V typ), soft-start/tracking dual-function pin, and thermal shutdown at 160°C with 10°C hysteresis.
Technical Context
The LM20143QMHX/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage to ensure stability across 0.8 V–VIN−0.3 V range without external loop tuning beyond COMP network. It supports diode emulation mode below ~100 mA load and pulse-skipping at very light loads.
Its functional architecture integrates UVLO (2.7 V rising, 45 mV hysteresis), overvoltage protection (108% of VFB), power-good monitoring (94% rising threshold, 16 µs deglitch), and thermal shutdown (160°C activation, 150°C recovery). The SS/TRK pin enables either programmable soft-start via external capacitor or ratiometric tracking of an external rail using resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous-supports high-current digital loads without external current-sense resistors or discrete switches. |
| Input Voltage Range | 2.95 V to 5.5 V-optimized for direct regulation from 3.3-V or 5-V system buses. |
| Feedback Reference | 0.800 V ±1.5%-enables precise low-voltage outputs down to 0.8 V with minimal resistor tolerance impact. |
| Switching Frequency | 500 kHz to 1.5 MHz-set by RT-to-ground resistor; higher frequencies allow smaller inductors (e.g., 1 µH typical). |
| Current Limit Threshold | 4.8 A typical (4.3–5.3 A min/max)-tight tolerance reduces required inductor saturation margin and improves short-circuit robustness. |
| Peak Efficiency | 97% at 1.2 V/2 A/1 MHz-achieved via low RDS(on) FETs (32/36 mΩ) and optimized gate drive timing. |
| Soft-Start Time | Programmable via SS/TRK capacitor; internal default is ~1 ms-controls inrush current and prevents input bus droop during startup. |
Pinout & Package
LM20143QMHX/NOPB is housed in a 16-pin HTSSOP package (4.4 mm × 5.0 mm) with exposed thermal pad (EP) on bottom, requiring PCB ground plane connection for optimal thermal performance (θJA = 39.3°C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 6,7) | Power input to internal high-side FET | Must be decoupled locally with low-ESR capacitor; shared with PVIN pins to minimize input loop inductance. |
| SW (Pins 8,13) | Switch node | Connects to inductor; high dv/dt node requiring tight layout and optional RC snubber in DCM operation. |
| PGND (Pins 9,10) | Power ground return for FETs | Separate from AGND; must tie to input/output capacitor ground near EP for low-noise switching. |
| FB (Pin 2) | Regulation feedback input | Connects to resistor divider from VOUT; 100 nA bias current enables high-value dividers for low quiescent loss. |
| PGOOD (Pin 3) | Open-drain power-good indicator | Asserts low when VOUT is within ±6% of target; 16 µs deglitch prevents false triggers during transients. |
| EN (Pin 12) | Enable control input | 1.18 V typical turn-on threshold with 66 mV hysteresis-supports precise sequencing via resistor divider from VIN. |
| SS/TRK (Pin 1) | Soft-start or voltage tracking input | 5 µA internal current source charges external cap for soft-start; also accepts external voltage for rail tracking. |
| COMP (Pin 4) | Compensation node | Connects to Type II/III network; transconductance error amp (510 µmho) allows stable loop with ceramic output caps. |
| RT (Pin 16) | Frequency set input | Resistor to ground sets oscillator frequency; 49.9 kΩ yields 1.5 MHz, 249 kΩ yields 510 kHz. |
| VCC (Pin 11) | Internal 2.7-V sub-regulator output | Bypass with 1-µF ceramic cap; powers gate drivers and internal logic independent of input rail. |
| AVIN (Pin 14) | Analog supply input | Filtered version of VIN; requires RC filter (e.g., 10 Ω + 1 µF) to reduce noise coupling into error amplifier. |
| AGND (Pin 15) | Analog ground reference | Quiet ground for AVIN, FB, COMP, EN-must be separated from PGND and connected at single point near EP. |
| NC (Pin 5) | No-connect terminal | Internally unconnected; TI recommends grounding to reduce EMI susceptibility. |
| EP | Exposed thermal pad | Electrically tied to GND; must be soldered to large PCB copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode operation across full 0.8–5.2 V output range without manual compensation adjustment. |
| Pre-bias startup | Does not sink current at startup if VOUT > 0 V-prevents reverse current flow through load parasitics in multi-rail systems (e.g., FPGA I/O/core sequencing). |
| Diode emulation mode | Disables low-side FET when inductor current reaches zero-eliminates reverse conduction losses and improves light-load efficiency below ~100 mA. |
| Integrated OVP/UVP/thermal protection | 108% overvoltage trip, 2.7 V UVLO with 45 mV hysteresis, and 160°C thermal shutdown-provides autonomous fault response without external supervision circuitry. |
| Tracking and soft-start dual function | Single SS/TRK pin supports either monotonic ramp-up (capacitor) or ratiometric start with external rail (resistor divider)-reduces BOM count and PCB footprint. |
Applications
| FPGA Core Supply | DSP Power Management |
|---|---|
|
Use Scenario: Regulating 1.0–1.2 V core voltage for Xilinx or Intel FPGAs with dynamic current demand up to 3 A. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering tightly regulated, low-noise core power with fast transient response. Use Value: Pre-bias startup prevents damage from I/O-to-core parasitic paths; 97% efficiency minimizes thermal load in dense logic arrays. |
Use Scenario: Powering TI C6000 or Analog Devices SHARC DSPs requiring clean 1.2 V or 1.4 V core rails with sequencing control. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator synchronized to system clock domain for EMI reduction. Use Value: SS/TRK pin enables simultaneous start with I/O rail; PGOOD signal coordinates DSP initialization and memory training sequences. |
| Optical Transceiver Module | Industrial PLC CPU Board |
|
Use Scenario: Generating 3.3 V or 2.5 V analog/digital supplies for SFP+ or QSFP modules operating in temperature-controlled enclosures. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with thermal fault protection for compact pluggable optics. Use Value: 160°C thermal shutdown protects laser driver ICs during ambient temperature excursions; 500 kHz–1.5 MHz frequency avoids sensitive RF bands. |
Use Scenario: Providing isolated 1.8 V or 2.5 V logic rails for ARM Cortex-M7 or RISC-V microcontrollers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust buck regulator supporting wide input (3.3–5.5 V) and extended temperature (−40°C to 125°C junction). Use Value: AEC-Q100 Grade 1 qualification ensures reliability in industrial environments; EN pin enables firmware-controlled power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3-A, 3.5–28 V input, fixed 500-kHz frequency, no SS/TRK tracking, higher RDS(on) (85/110 mΩ) | Better suited for higher-input industrial rails; lacks pre-bias startup and voltage tracking. | Select when input exceeds 5.5 V or tracking is unnecessary; verify loop stability with ceramic output caps. |
| LM2678SX-3.3/NOPB | 5-A, 8–40 V input, 100-kHz fixed frequency, non-synchronous (external diode), no PGOOD or soft-start | Targeted at cost-sensitive, lower-frequency industrial supplies; higher dropout and lower efficiency at 3.3 V. | Choose only for legacy designs needing drop-in replacement with minimal layout change; expect 5–8% lower efficiency than LM20143QMHX/NOPB. |
Compared with TPS54332DR and LM2678SX-3.3/NOPB, LM20143QMHX/NOPB delivers superior light-load efficiency via diode emulation, tighter output accuracy (0.8 V ±1.5%), and integrated rail-tracking-making it optimal for space-constrained, multi-rail digital systems where sequencing and thermal margin are critical.
Availability
LM20143QMHX/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP power management, optical transceiver modules, and industrial PLC CPU boards requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for LM20143QMHX/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies-with over 50 years of innovation in high-reliability power conversion ICs.
The LM20143 product line targets high-efficiency, low-voltage point-of-load regulation for advanced digital processors-emphasizing ease of design, thermal resilience, and seamless integration into multi-rail power architectures.
FAQ
What is the recommended input capacitor for LM20143QMHX/NOPB?
The LM20143QMHX/NOPB requires a low-ESR ceramic input capacitor placed close to PVIN and PGND pins. TI recommends ≥22 µF total capacitance (e.g., two 10-µF X5R 0805 capacitors) with ≤5 mΩ ESR to suppress high-frequency switching noise and limit input voltage ripple to <50 mV peak-to-peak under 3-A load steps. The LM20143QMHX/NOPB datasheet specifies this configuration for stable operation across 500 kHz–1.5 MHz.
Does LM20143QMHX/NOPB support forced PWM mode?
No, LM20143QMHX/NOPB does not support forced PWM mode. It operates in peak current mode with automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and diode emulation mode based on load current. Below ~100 mA, it enters pulse-skipping mode to maintain regulation while maximizing light-load efficiency-this behavior is inherent to its control architecture and cannot be disabled.
Can LM20143QMHX/NOPB be used with ceramic output capacitors?
Yes, LM20143QMHX/NOPB is fully compatible with ceramic output capacitors. Its transconductance error amplifier (510 µmho) and Type II/III compensation flexibility allow stable loop response with low-ESR ceramics (e.g., 22–100 µF X5R/X7R). The LM20143QMHX/NOPB datasheet confirms stable operation with 100 µF ceramic output caps and 1-µH inductor at 1.2 V/2 A/1 MHz-no tantalum or electrolytic caps required.
What is the maximum allowable RT resistor value for LM20143QMHX/NOPB?
The maximum recommended RT resistor value for LM20143QMHX/NOPB is 249 kΩ, which sets the minimum switching frequency to 450 kHz (typical). Values above 249 kΩ risk oscillator instability and increased jitter; TI's SNVS528H datasheet specifies 450–1650 kHz as the validated operating range. Using 249 kΩ ensures reliable startup and regulation across −40°C to 125°C junction temperatures-the LM20143QMHX/NOPB must remain within this bound for guaranteed performance.
How does the LM20143QMHX/NOPB handle output short-circuit conditions?
Under output short-circuit, LM20143QMHX/NOPB activates cycle-by-cycle current limiting (4.8 A typical), then implements frequency and voltage foldback: successive overcurrent events decrement the reference voltage and skip pulses until safe restart. Thermal shutdown (160°C) engages as final protection. Recovery occurs automatically after junction cools to ~150°C-no latch-off or external reset is needed. This multi-tiered response is intrinsic to the LM20143QMHX/NOPB's internal protection architecture.
LM20143QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- 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):
- 2.95V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.68V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20143QMHX/NOPB FAQ
1.How can I place an order for LM20143QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20143QMHX/NOPB 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 LM20143QMHX/NOPB reliable?
The price and inventory of LM20143QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20143QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20143QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20143QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20143QMHX/NOPB?
LM20143QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20143QMHX/NOPB 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 LM20143QMHX/NOPB?
For technical support, including LM20143QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20143QMHX/NOPB requirements.
6.How does Aetrix verify that LM20143QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20143QMHX/NOPB 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 LM20143QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20143QMHX/NOPB?
All LM20143QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20143QMHX/NOPB, 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 LM20143QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM20143QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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