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Texas Instruments LMR12020XSDX/NOPB
- Part No.:
- LMR12020XSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LMR12020XSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR12020XSDX/NOPB from Texas Instruments is a monolithic 2-MHz peak-current-mode PWM step-down DC/DC regulator delivering up to 2-A output current with 1% feedback voltage accuracy, 70-nA shutdown current, and internal compensation in a 10-pin WSON (3 × 3 × 0.8 mm) package - used for point-of-load conversion from 5-V or 12-V rails in space-constrained industrial and embedded systems.
For engineers reviewing the LMR12020XSDX/NOPB datasheet, LMR12020XSDX/NOPB pinout, LMR12020XSDX/NOPB application, or LMR12020XSDX/NOPB equivalent, key selection considerations include verified 2-A current limit, 65-ns minimum on-time support for high-frequency operation, thermal shutdown at 165°C, synchronous frequency range (1–2.35 MHz), and validated compatibility with ceramic output capacitors and low-ESR catch diodes.
Technical Context
The LMR12020XSDX/NOPB implements peak-current-mode control with an internal 150-mΩ NMOS switch and fixed 2-MHz oscillator synchronized via the SYNC pin (1–2.35 MHz). Its internal soft-start (1-ms typical) ramps the 1-V reference to limit inrush, while frequency foldback activates below 0.53 V on FB to protect during short-circuit events.
It features dual supply rails: AVIN powers control circuitry (3–20 V), PVIN powers the power stage (3–20 V), and BOOST generates gate drive (≈VIN + 3.9 V – 0.4 V) via external bootstrap capacitor. Overvoltage protection triggers at 1.13×VREF (1.13 V), and undervoltage lockout engages below 2.75 V with 470-mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A maximum continuous - supports compact PoL designs for FPGA core or SoC I/O rails without external current-sense resistors. |
| Switching Frequency | 2 MHz nominal, synchronizable 1–2.35 MHz - enables use of ≤1-µH inductors and chip-scale ceramic capacitors to minimize footprint. |
| Feedback Voltage | 1.0 V ±1% over –40°C to +125°C - ensures tight regulation for digital ICs requiring stable 1.2-V or 1.8-V supplies. |
| Shutdown Current | 70 nA typical - preserves battery life in always-on subsystems such as sensor nodes or backup power monitors. |
| Minimum On-Time | 65 ns - supports high VIN-to-VOUT ratios (e.g., 12 V → 1.2 V at 10% duty cycle) without pulse-skipping instability. |
| Thermal Shutdown | 165°C junction temperature with 15°C hysteresis - provides robust fault recovery in sealed enclosures or high-ambient environments. |
| Input Voltage Range | 3 V to 20 V - accommodates unregulated 5-V, 12-V, and 19-V adapter inputs without pre-regulation. |
Pinout & Package
LMR12020XSDX/NOPB uses a thermally enhanced 10-pin WSON (DSC) package (3.00 mm × 3.00 mm × 0.8 mm) with exposed DAP for PCB-level heat dissipation. Pin 1 is SW (switch node), and pins 9–10 are PVIN (power input); DAP must be soldered directly to GND plane per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor, catch diode cathode, and bootstrap capacitor - carries high di/dt switching current; requires tight loop layout. |
| BOOST | Bootstrap supply | Drives NMOS gate; requires 0.1-µF ceramic capacitor between BOOST and SW to sustain >3.9-V gate drive above SW. |
| EN | Enable control | Logic-high (>1.8 V) enables regulation; <0.4 V disables with 70-nA quiescent draw - must not float or exceed VIN + 0.3 V. |
| SYNC | Frequency sync input | Accepts external clock (1–2.35 MHz); grounding selects internal 2-MHz oscillator - loss of signal reverts within 1.5 µs. |
| FB | Feedback input | Senses output via resistor divider; regulates to 1.0 V - accuracy directly determines VOUT tolerance (e.g., 1.8 V ±18 mV). |
| GND / DAP | Signal & power ground | Pins 7 (GND) and DAP form common return path; DAP must be soldered to solid GND plane for thermal and noise performance. |
| AVIN | Analog supply | Powers error amplifier, oscillator, and logic - decouple with 0.1-µF ceramic close to pin to suppress noise coupling into FB. |
| PVIN | Power input | Supplies NMOS switch; separate from AVIN to isolate noisy power path - requires ≥4.7-µF bulk capacitance near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck configurations. |
| Peak-current-mode control | Provides inherent cycle-by-cycle current limiting (2.5-A min) and fast transient response without external slope compensation. |
| Frequency foldback | Reduces switching frequency to 220 kHz during output short-circuit - limits power dissipation and prevents thermal runaway. |
| 1% VREF accuracy | Ensures ±1% output voltage tolerance across line, load, and temperature - meets requirements for DDR memory termination or ADC reference supplies. |
| 70-nA shutdown | Enables ultra-low-power sleep modes in portable instrumentation - measurable impact on battery runtime in multi-week standby applications. |
Applications
| Industrial PLC I/O Module | Automotive Infotainment Core Supply |
|---|---|
Use Scenario: Regulating 12-V vehicle battery to 1.2-V for ARM Cortex-A72 processor core in head-unit SoC. IC Role / Device Role / Timing Role: Primary buck converter providing tightly regulated core voltage with fast load-step response to handle burst-mode CPU activity. Use Value: 2-A capability and 65-ns minimum on-time enable direct 12-V→1.2-V conversion without intermediate stages, reducing component count and board area by 35% vs. two-stage solution. |
Use Scenario: Generating 3.3-V rail for CAN transceivers and display interface logic in dashboard cluster. IC Role / Device Role / Timing Role: Point-of-load regulator with SYNC pin locked to system clock to eliminate beat frequencies with adjacent RF modules. Use Value: 1–2.35-MHz synchronization range allows EMI alignment outside AM band (530–1710 kHz), meeting CISPR-25 Class 5 conducted emissions limits without added filtering. |
| Medical Wearable Sensor Hub | Network Edge Router PHY Supply |
Use Scenario: Powering ultra-low-noise analog front-end (AFE) and BLE radio from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: High-efficiency buck supplying 1.8-V digital logic and 3.3-V analog bias, operating down to 3-V input with UVLO hysteresis. Use Value: 70-nA shutdown current extends battery life beyond 6 months in intermittent-sampling mode; 1% VFB accuracy maintains ADC reference stability across temperature. |
Use Scenario: Delivering 5-V/1.5-A to Ethernet PHY ICs in fanless enterprise switch with strict thermal envelope. IC Role / Device Role / Timing Role: Thermally optimized buck regulator using DAP-to-GND thermal path to maintain <125°C junction under full load at 70°C ambient. Use Value: 33°C/W θJA enables 2-A operation without heatsink in 2-layer PCB; thermal shutdown with 15°C hysteresis prevents latch-up during transient overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR12015XSDX/NOPB | 1.5-A output current rating, identical pinout and feature set - shares same WSON-10 package and 2-MHz base frequency. | Lower current capacity suits sub-1-A loads like microcontrollers or sensors where thermal margin is less critical. | Select when 1.5-A peak load suffices and cost optimization is prioritized over headroom. |
| TPS562201DDCR | 2-A synchronous buck with integrated FETs, 4.5–17-V input, but no SYNC pin or frequency foldback - uses voltage-mode control. | Lacks short-circuit foldback and external sync; better suited for fixed-frequency, non-EMI-sensitive applications with simpler layout. | Choose when board space is constrained and SYNC/foldback features are unnecessary - requires external compensation. |
Compared with LMR12020XSDX/NOPB, LMR12015XSDX/NOPB offers identical functionality at reduced current rating, while TPS562201DDCR trades advanced protection and synchronization for lower BOM count and simplified design - neither is pin-compatible, but both address overlapping 2-A buck use cases with distinct trade-offs in control architecture and fault handling.
Availability
LMR12020XSDX/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and medical wearable applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LMR12020XSDX/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 decades of expertise in high-reliability DC/DC conversion solutions.
The LMR120xx product line was designed specifically for space-constrained point-of-load applications demanding high efficiency, fast transient response, and minimal external components - targeting industrial, automotive, and portable electronics markets.
FAQ
What is the maximum supported input voltage for LMR12020XSDX/NOPB?
The LMR12020XSDX/NOPB supports an absolute maximum input voltage of 24 V on AVIN and PVIN pins, with recommended operation from 3 V to 20 V. Exceeding 20 V risks violating the 28-V absolute max on the BOOST pin and may trigger overvoltage stress conditions not covered by normal operation specifications.
Does LMR12020XSDX/NOPB require an external bootstrap diode?
No - LMR12020XSDX/NOPB integrates a bootstrap LDO and internal charging path; only an external 0.1-µF ceramic capacitor between BOOST and SW is required. An external Schottky diode is optional only for sub-5-V input operation with >75% duty cycle, per TI's application guidance in Section 7.3.2.
Can LMR12020XSDX/NOPB operate with ceramic output capacitors?
Yes - LMR12020XSDX/NOPB is fully compatible with low-ESR ceramic output capacitors, as confirmed by TI's typical application circuits and stability analysis. The internally compensated design eliminates the need for electrolytic or tantalum types, enabling compact, high-reliability output filtering.
What is the thermal resistance (θJA) of LMR12020XSDX/NOPB in its WSON package?
The LMR12020XSDX/NOPB has a measured θJA of 33°C/W when mounted on a standard 3" × 3" 4-layer PCB with 2 oz. copper, per Section 6.2 of the datasheet. This value assumes proper DAP soldering to a solid GND plane - inadequate thermal land design can increase θJA by >50%.
How does frequency foldback function during output short-circuit on LMR12020XSDX/NOPB?
When FB falls below 0.53 V during a short-circuit event, LMR12020XSDX/NOPB smoothly reduces switching frequency from 2 MHz down to 220 kHz (typical) to limit power dissipation. Synchronization is disabled during foldback, and operation resumes at the internal 2-MHz clock once FB rises above 0.53 V.
LMR12020XSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 10-WFDFN Exposed Pad
- 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):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LMR12020XSDX/NOPB FAQ
1.How can I place an order for LMR12020XSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR12020XSDX/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 LMR12020XSDX/NOPB reliable?
The price and inventory of LMR12020XSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR12020XSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LMR12020XSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR12020XSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR12020XSDX/NOPB?
LMR12020XSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR12020XSDX/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 LMR12020XSDX/NOPB?
For technical support, including LMR12020XSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR12020XSDX/NOPB requirements.
6.How does Aetrix verify that LMR12020XSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR12020XSDX/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 LMR12020XSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LMR12020XSDX/NOPB?
All LMR12020XSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR12020XSDX/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 LMR12020XSDX/NOPB part is unused and in its original packaging.
Return procedure for LMR12020XSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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