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Texas Instruments LMR12020XSD/NOPB
- Part No.:
- LMR12020XSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LMR12020XSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR12020XSD/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 - designed for point-of-load conversion from 3.3-V, 5-V, or 12-V rails in space-constrained industrial and embedded systems.
For engineers reviewing the LMR12020XSD/NOPB datasheet, LMR12020XSD/NOPB pinout, LMR12020XSD/NOPB application, or LMR12020XSD/NOPB equivalent, key selection considerations include its 3–20-V input range, 1–18-V adjustable output, 2.5-A minimum current limit, frequency synchronization capability (1–2.35 MHz), and thermal shutdown at 165°C - all critical for compact, high-efficiency power delivery in FPGA, DSP, and microcontroller core supplies.
Technical Context
The LMR12020XSD/NOPB implements constant-frequency peak-current-mode control with an internally compensated error amplifier and fixed 1-ms soft-start ramp. Its 65-ns minimum on-time enables high duty-cycle operation down to 3-V input while maintaining regulation across 1–18-V outputs.
It integrates dual supply rails (PVIN for power stage, AVIN for control logic), a bootstrap LDO generating ~3.9-V gate drive (VBOOST – VSW), and frequency foldback that reduces switching frequency to 220 kHz during overcurrent or short-circuit events - ensuring robustness without external protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports direct regulation from common intermediate rails (5 V, 12 V) and wide-input industrial supplies. |
| Max Output Current | 2 A - delivers full rated load with internal 150-mΩ NMOS switch; current limit threshold ≥2.5 A ensures margin under transient conditions. |
| Switching Frequency | 2 MHz (internal) or 1–2.35 MHz (synchronized) - enables use of sub-2.2-µH inductors and chip-scale ceramic capacitors to minimize solution footprint. |
| Feedback Voltage Accuracy | ±1% (0.99 V to 1.01 V at 25°C) - ensures tight output regulation for powering sensitive digital ICs including processors and memory interfaces. |
| Shutdown Quiescent Current | 70 nA - allows ultra-low-power system standby modes without compromising wake-up responsiveness. |
| Thermal Shutdown Threshold | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling automatic recovery. |
| Minimum On-Time | 65 ns - supports high step-down ratios (e.g., 12 V → 1.2 V at 2 MHz) without pulse-skipping instability. |
Pinout & Package
LMR12020XSD/NOPB uses a thermally enhanced 10-pin WSON package (3.00 mm × 3.00 mm × 0.8 mm) with exposed DAP (Die Attach Pad) tied to GND for improved thermal dissipation and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Power Switch Node | Connects to inductor, catch diode, and bootstrap capacitor; carries high di/dt switching current - requires tight layout and low-inductance routing. |
| 3 BOOST | Bootstrap Supply | Provides gate drive voltage (VBOOST – VSW ≈ 3.9 V) for internal NMOS; requires 0.1-µF ceramic capacitor between BOOST and SW. |
| 4 EN | Enable Control Input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 70-nA quiescent draw - must not float or exceed VIN + 0.3 V. |
| 5 SYNC | Frequency Synchronization | Accepts external clock (1–2.35 MHz); grounding selects internal 2-MHz oscillator - used to eliminate beat frequencies in multi-rail systems. |
| 6 FB | Feedback Input | Senses output voltage via resistor divider; internal 1-V reference enables precise output setting (VOUT = 1 V × (1 + R1/R2)). |
| 7 GND | Signal & Power Ground | Reference for FB, EN, SYNC; place bottom feedback resistor adjacent to this pin to minimize noise-induced regulation error. |
| 8 AVIN | Analog Supply Rail | Powers internal control circuitry (error amp, oscillator, logic); bypass with 0.1-µF capacitor close to pin. |
| 9,10 PVIN | Power Stage Input | Supplies NMOS switch; requires low-ESR bulk capacitance near pin to handle high pulsed current and reduce input ripple. |
| DAP | Thermal & Ground Pad | Exposed copper pad soldered to PCB ground plane - essential for thermal performance (θJA = 33°C/W) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Control Loop | Eliminates need for external compensation network - reduces BOM count and design iteration time for stable operation across 3–20-V input and 1–18-V output ranges. |
| Peak-Current-Mode PWM Architecture | Provides inherent cycle-by-cycle current limiting and fast transient response - maintains regulation during sudden load steps without external current-sense resistors. |
| Fixed 1-ms Internal Soft Start | Ramps internal reference from 0 V to 1 V - prevents inrush current into output capacitors and avoids overshoot during power-up sequences. |
| Output Overvoltage Protection (OVP) | Shuts off NMOS switch when FB exceeds 1.13 V - protects downstream loads from fault-induced overvoltage events without requiring external crowbar circuits. |
| Frequency Foldback Under Fault | Reduces switching frequency to 220 kHz when FB drops below 0.53 V - limits power dissipation during short-circuit or severe overload conditions. |
Applications
| Industrial PLC I/O Modules | FPGA Core Power Supply |
|---|---|
Use Scenario: Regulating 1.2-V or 1.8-V core voltage for field-programmable gate arrays in programmable logic controllers with limited board area and strict thermal constraints. IC Role / Device Role / Timing Role: Primary buck converter providing tightly regulated, low-noise core supply with fast transient response to handle dynamic FPGA logic switching. Use Value: 2-A capability and 1% feedback accuracy ensure stable operation across process/voltage/temperature corners; 2-MHz switching minimizes inductor size in dense I/O module layouts. | Use Scenario: Generating 3.3-V or 5-V auxiliary rail for FPGA configuration, transceivers, and peripherals in compact edge-computing hardware. IC Role / Device Role / Timing Role: Secondary buck regulator delivering clean, efficient power to mixed-signal blocks with minimal external components. Use Value: Synchronization capability (1–2.35 MHz) allows alignment with system clock domain to suppress EMI in high-speed serial links (e.g., PCIe, USB). |
| Automotive Infotainment Processors | Medical Imaging Sensor Bias Rails |
Use Scenario: Powering ARM-based application processors in automotive head units where input voltage varies from 5 V (USB-C PD) to 12 V (battery), and EMI must meet CISPR-25 Class 5 limits. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter operating in forced PWM mode to avoid AM-band interference. Use Value: 2-MHz fixed frequency places fundamental switching harmonics above 30 MHz - simplifies EMI filter design and reduces shielding requirements. | Use Scenario: Providing stable ±5-V or ±12-V bias for analog front-end amplifiers and ADC drivers in portable ultrasound or X-ray detector modules. IC Role / Device Role / Timing Role: Point-of-load regulator supplying low-noise analog rails with tight line/load regulation and low quiescent current during standby. Use Value: 70-nA shutdown current extends battery life in handheld diagnostic devices; 1% VFB accuracy ensures consistent sensor gain calibration across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR12015XSD/NOPB | 1.5-A max output current; identical pinout, package, and feature set except lower current rating and 2-A min current limit. | Suitable for <1.5-A loads; same PCB layout but reduced thermal margin and transient capability. | Select when load current is consistently ≤1.5 A and cost optimization is prioritized over headroom. |
| TPS62865RRLR | 3-A output, 2.5-V to 5.5-V input, 1.8-MHz fixed frequency, integrated inductor option available; different pinout and package (12-pin QFN). | Requires PCB redesign; better suited for ultra-compact, low-input-voltage applications (e.g., USB-powered devices). | Choose only if higher current, lower input voltage, or integrated inductor benefits outweigh layout change costs. |
Compared with LMR12020XSD/NOPB, LMR12015XSD/NOPB offers identical functionality at reduced current capacity, while TPS62865RRLR provides higher output current and lower input range but demands new layout and lacks frequency synchronization - making LMR12020XSD/NOPB optimal for 2-A, 3–20-V, space-constrained designs requiring EMI control and design reuse.
Availability
LMR12020XSD/NOPB is available at Aetrix Electronics and suitable for industrial automation, medical imaging subsystems, and automotive infotainment systems requiring stable component supply, long-term manufacturability, and TI's industry-standard qualification.
Supply support for LMR12020XSD/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 power conversion ICs.
The LMR120xx product line was engineered specifically for compact, high-frequency DC/DC point-of-load regulation in space-constrained applications - emphasizing ease of use, minimal external components, and robust fault protection without sacrificing efficiency or accuracy.
FAQ
What is the maximum input voltage rating for LMR12020XSD/NOPB?
The absolute maximum input voltage for LMR12020XSD/NOPB is 24 V on both PVIN and AVIN pins, but the recommended operating range is 3 V to 20 V. Exceeding 20 V may trigger undervoltage lockout release prematurely or degrade long-term reliability - always maintain input within the 3–20-V window for guaranteed performance per the datasheet.
Does LMR12020XSD/NOPB require external compensation components?
No, LMR12020XSD/NOPB features an internally compensated control loop optimized for stability across its full operating range. No external compensation network is needed - only the standard input/output capacitors, inductor, feedback resistors, and BOOST capacitor are required for functional operation.
Can LMR12020XSD/NOPB synchronize to an external clock signal?
Yes, LMR12020XSD/NOPB supports frequency synchronization via its SYNC pin, accepting external clock signals from 1 MHz to 2.35 MHz. When SYNC is grounded, it defaults to the internal 2-MHz oscillator. Loss of the external clock causes automatic reversion to internal operation within 1.5 µs - enabling reliable multi-rail timing coordination.
What thermal management guidance applies to LMR12020XSD/NOPB?
LMR12020XSD/NOPB uses a thermally enhanced WSON package with an exposed DAP pad that must be soldered to a PCB ground plane. TI specifies θJA = 33°C/W on a 4-layer board with 2 oz. copper; thermal shutdown activates at 165°C with 15°C hysteresis - proper DAP connection and adequate copper area are mandatory for 2-A continuous operation.
How does the current limit function in LMR12020XSD/NOPB?
LMR12020XSD/NOPB employs cycle-by-cycle peak current limiting with a minimum threshold of 2.5 A. During each switching cycle, the internal current-sense amplifier monitors the NMOS switch current; if the sensed value exceeds 2.5 A, the switch is immediately turned off for that cycle - protecting against overload, short-circuit, and startup inrush without external sensing elements.
LMR12020XSD/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)
LMR12020XSD/NOPB FAQ
1.How can I place an order for LMR12020XSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR12020XSD/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 LMR12020XSD/NOPB reliable?
The price and inventory of LMR12020XSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR12020XSD/NOPB is usually 5 days.
3.What payment methods are accepted for LMR12020XSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR12020XSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR12020XSD/NOPB?
LMR12020XSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR12020XSD/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 LMR12020XSD/NOPB?
For technical support, including LMR12020XSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR12020XSD/NOPB requirements.
6.How does Aetrix verify that LMR12020XSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR12020XSD/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 LMR12020XSD/NOPB meets industry standards.
7.What is the process for return or replacement of LMR12020XSD/NOPB?
All LMR12020XSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR12020XSD/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 LMR12020XSD/NOPB part is unused and in its original packaging.
Return procedure for LMR12020XSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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