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Texas Instruments LM25011MYX/NOPB
- Part No.:
- LM25011MYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM25011MYX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
LM25011MYX/NOPB from Texas Instruments is a 42-V, 2-A constant-on-time (COT) synchronous buck regulator with integrated 2-A N-channel MOSFET switch, adjustable current limit (–146 mV threshold), 2.51 V ±2% feedback reference, and power-good (PGD) output. It operates from 6 V to 42 V input, supports up to 2 MHz switching frequency via RT resistor, and delivers stable bias power in automotive front-camera and infotainment systems.
For engineers reviewing the LM25011MYX/NOPB datasheet, LM25011MYX/NOPB pinout, LM25011MYX/NOPB application, or LM25011MYX/NOPB equivalent, key selection considerations include its COT topology's ultra-fast transient response, no-loop-compensation requirement, ceramic-capacitor compatibility, valley-current-limit adjustability, and HVSSOP-10 thermal performance (RθJA = 48°C/W).
Technical Context
The LM25011MYX/NOPB implements constant-on-time control where tON is inversely proportional to VIN and set by an external RT resistor - enabling near-constant switching frequency across line/load variations. Its valley-current-limit detection uses the CS/CSG pins to monitor voltage drop across an external sense resistor, triggering on-time reduction (by ~40%) only during current limit events.
Internal architecture integrates a bootstrap gate driver (BST/SW pins), 5-V startup regulator, precision 2.51-V reference, and dedicated signal ground (SGND) and current-sense ground (CSG) to minimize noise coupling. The PGD output asserts high when FB reaches ≥95% of VREF, with built-in hysteresis for reliable power sequencing in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide automotive battery range including cold-crank (6 V) and load-dump (42 V) conditions. |
| Output Current | Up to 2 A continuous - enabled by integrated 0.3 Ω (typ) RDS(ON) N-channel buck switch. |
| Feedback Reference | 2.51 V ±2% - sets regulated VOUT = 2.51 × (1 + RFB1/RFB2); enables precise output adjustment down to 2.51 V. |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - higher frequencies allow smaller magnetics and faster transient response. |
| Current Limit Threshold | –146 mV (min) at CS pin - defines peak inductor current; adjustable via RS value for optimized inductor sizing. |
| Power Good Accuracy | ±3.3% hysteresis at FB - ensures robust power sequencing without false triggers during brown-out recovery. |
| Thermal Shutdown | 155°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM25011MYX/NOPB is housed in a thermally enhanced 10-pin HVSSOP (DGQ) package (3.00 mm × 3.00 mm) with exposed pad soldered to PCB ground for improved heat dissipation (RθJC(bot) = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 6–42 V; requires low-ESR capacitor placed adjacent to SGND for stable operation. |
| RT | On-time programming | Resistor from VIN sets tON; determines switching frequency and minimum off-time compliance. |
| PGD | Open-drain power-good indicator | Asserts high when FB ≥ 95% of 2.51 V; requires external pull-up ≤7 V for logic-level interfacing. |
| SS | Soft-start timing control | 10 µA internal current source charges external CSS; controls ramp rate of VOUT at startup. |
| SGND | Signal ground reference | Reference for FB, RT, SS, PGD; must be separated from power ground to avoid noise coupling. |
| FB | Feedback input | Compares against 2.51 V reference; connects to voltage divider (RFB1/RFB2) for output regulation. |
| CSG | Current-sense ground | Dedicated ground return for current-sense circuitry; must connect directly to RS and system ground. |
| CS | Current-sense input | Monitors voltage across external sense resistor RS; triggers valley-current limit when ≤ –146 mV. |
| SW | Switching node | Connects to inductor, diode cathode, and BST capacitor; carries high dv/dt; requires tight layout. |
| BST | Bootstrap supply | 0.1 µF capacitor to SW provides gate drive voltage; recharged during off-time via internal diode. |
Key Features
| Feature | Design Value |
|---|---|
| COT topology | Eliminates need for external compensation network; enables stable operation with ceramic output capacitors and ultra-fast load-step response. |
| Adjustable valley current limit | Configurable via RS value; allows optimization of inductor size and peak current handling without foldback behavior. |
| Integrated 2-A N-channel switch | Reduces BOM count and layout area; 0.3 Ω typical RDS(ON) minimizes conduction loss at full load. |
| Power-good (PGD) output | Provides system-level power sequencing confirmation with 5% regulation window and hysteresis for noise immunity. |
| Thermal-enhanced HVSSOP | Exposed pad improves thermal resistance (RθJC(bot) = 10°C/W); supports 2 A continuous operation with proper PCB copper area. |
Applications
| Automotive Front Camera | Infotainment Power Rail |
|---|---|
Use Scenario: Powers image sensor and ISP in ADAS front-facing camera modules operating under harsh automotive transients (load dump, cold crank). IC Role / Device Role / Timing Role: Primary 5 V or 3.3 V bias regulator delivering 1.5 A with fast transient response to handle burst-mode sensor readout. Use Value: COT control maintains regulation during rapid load steps; PGD enables safe sensor initialization before data capture. | Use Scenario: Supplies clean, regulated voltage to audio DSP, display controller, and USB interface in vehicle head units. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping down 12 V battery to 5 V/3.3 V rails with minimal EMI impact on sensitive analog circuits. Use Value: Adjustable soft-start prevents inrush current into large downstream capacitance; 2.51 V reference ensures accurate rail tracking. |
| Telecom Remote Radio Unit | Industrial Control I/O Module |
Use Scenario: Provides isolated DC-DC bias for RF front-end components in 4G/5G remote radio heads exposed to wide temperature ranges. IC Role / Device Role / Timing Role: High-voltage input (up to 42 V) buck regulator supporting PoE-derived or battery-backed supplies in outdoor enclosures. Use Value: 125°C max junction rating and thermal shutdown ensure reliability in unventilated environments; RT-programmable frequency avoids sensitive RF bands. | Use Scenario: Powers microcontroller, ADC, and isolation drivers in programmable logic controllers requiring stable 3.3 V/5 V rails amid industrial noise. IC Role / Device Role / Timing Role: Robust primary regulator with UVLO (4.6 V) and overtemperature protection for factory-floor deployment. Use Value: Separate CSG/SGND pins reduce ground bounce in mixed-signal systems; PGD signals MCU when rail is ready for firmware boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011A-MYX/NOPB | Shorter minimum off-time (52 ns vs. 90 ns); enables higher switching frequency at low VIN. | Better suited for >1.5 MHz designs with 6–12 V input; not drop-in due to different tON-current-limit behavior. | Select LM25011A-MYX/NOPB only if high-frequency operation below 12 V is required; LM25011MYX/NOPB preferred for general-purpose 6–42 V designs. |
| TPS54240DGQR | Current-mode control (not COT); 42 V max input; 2 A output; requires external compensation. | Lacks PGD output and valley-current limit; offers adjustable slope compensation for stability with low-ESR caps. | Choose TPS54240DGQR when loop compensation flexibility is needed or when PGD is not required; LM25011MYX/NOPB preferred for simpler, faster-transient designs. |
Compared with LM25011A-MYX/NOPB, the LM25011MYX/NOPB provides superior transient response and simpler layout due to COT operation, while TPS54240DGQR offers current-mode flexibility at the cost of added compensation complexity and no power-good signaling.
Availability
LM25011MYX/NOPB is available at Aetrix Electronics and suitable for automotive safety systems, infotainment subsystems, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM25011MYX/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 ICs, with decades of automotive-grade product development experience.
The LM25011 family was designed specifically for high-reliability, wide-input-voltage buck conversion in automotive and industrial applications - emphasizing simplicity (no compensation), robustness (45 V abs max), and functional safety (PGD, thermal shutdown).
FAQ
What is the absolute maximum input voltage rating for LM25011MYX/NOPB?
The absolute maximum input voltage rating for LM25011MYX/NOPB is 45 V, as specified in the Absolute Maximum Ratings table. This exceeds its recommended operating range of 6 V to 42 V and provides margin for automotive load-dump transients. Operation above 42 V is permitted only for short-duration transients, not continuous operation. Exceeding 45 V risks permanent damage to the internal N-channel switch and gate driver circuitry.
How does the LM25011MYX/NOPB implement current limiting?
The LM25011MYX/NOPB implements valley-current limiting by monitoring the voltage at the CS pin relative to CSG. When the sensed voltage drops to –146 mV (minimum), the current-limit comparator triggers and reduces the on-time by ~40% on a cycle-by-cycle basis until regulation recovers. This avoids foldback behavior and maintains predictable constant-current mode during overload, with peak switch current limited to 3.5 A and average output current capped at 2 A.
Can LM25011MYX/NOPB operate with ceramic output capacitors?
Yes, LM25011MYX/NOPB is fully compatible with ceramic output capacitors due to its constant-on-time (COT) control architecture, which eliminates the need for external loop compensation. The COT topology inherently stabilizes with low-ESR ceramics, enabling smaller footprint, lower ripple, and improved transient response compared to electrolytic or tantalum alternatives. No additional compensation components are required.
What is the purpose of the separate CSG and SGND pins on LM25011MYX/NOPB?
The separate CSG (Current Sense Ground) and SGND (Signal Ground) pins on LM25011MYX/NOPB isolate high-noise current-sense return paths from sensitive analog circuitry. CSG serves exclusively as the return for the CS pin amplifier and current-sense resistor RS, while SGND references FB, RT, SS, and PGD. This separation prevents ground bounce from switching currents from corrupting feedback accuracy or soft-start timing, critical for stable regulation in noisy environments.
Does LM25011MYX/NOPB support adjustable soft-start, and how is it configured?
Yes, LM25011MYX/NOPB supports adjustable soft-start via an external capacitor (CSS) connected to the SS pin. An internal 10 µA current source charges CSS, ramping the FB reference to control VOUT rise time. Soft-start duration is calculated as tSS ≈ (2.51 V × CSS) / 10 µA. For example, a 100 nF capacitor yields ~25 ms ramp time. CSS must be ≥1000 pF for proper operation, and the SS pin voltage must remain ≤3 V to avoid damage.
LM25011MYX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm 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):
- 6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 2.51V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 2A
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
LM25011MYX/NOPB FAQ
1.How can I place an order for LM25011MYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25011MYX/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 LM25011MYX/NOPB reliable?
The price and inventory of LM25011MYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25011MYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25011MYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25011MYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25011MYX/NOPB?
LM25011MYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25011MYX/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 LM25011MYX/NOPB?
For technical support, including LM25011MYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25011MYX/NOPB requirements.
6.How does Aetrix verify that LM25011MYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25011MYX/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 LM25011MYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25011MYX/NOPB?
All LM25011MYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25011MYX/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 LM25011MYX/NOPB part is unused and in its original packaging.
Return procedure for LM25011MYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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