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Texas Instruments LM25011AMYX
- Part No.:
- LM25011AMYX
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM25011AMYX.pdf
- Description:
- IC REG BUCK ADJ 2A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,473
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Product details
Overview
LM25011AMYX 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, and precision 2.51-V feedback reference. It operates from 6 V to 42 V input, delivers up to 2 A output current, supports switching frequencies up to 2 MHz, and features power-good indication for automotive infotainment power rails.
For engineers reviewing the LM25011AMYX datasheet, LM25011AMYX pinout, LM25011AMYX application, or LM25011AMYX equivalent, key selection considerations include its COT topology's ultra-fast transient response, valley current limit adjustability for inductor sizing, bootstrap gate drive architecture, thermal shutdown, and HVSSOP-10 package with exposed thermal pad.
Technical Context
The LM25011AMYX implements constant on-time control with input-voltage-dependent on-time (tON ∝ 1/VIN), enabling near-constant switching frequency across line and load variations without loop compensation. Its valley current limit detection enables smooth transition from CV to CC mode, and internal ripple generation (ERM) eliminates need for external ripple injection at the FB pin.
It integrates a high-side N-channel buck switch with bootstrap gate driver requiring a 0.1-µF BST-to-SW capacitor, uses SGND/CSG dual-ground separation for accurate current sensing, and provides a logic-level PGD output asserting high when FB reaches ≥95% of 2.51 V - critical for system power sequencing in automotive safety modules.
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 - sufficient for powering DSPs, image sensors, and MCU cores in ADAS subsystems |
| Feedback Reference | 2.51 V ±2% - enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V) using standard resistor dividers |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - allows compact magnetics and reduced EMI filtering footprint |
| Current Limit Threshold | –130 mV at CS pin - sets peak inductor current; adjustable via sense resistor for optimized thermal performance |
| Power Good Threshold | 95% of VREF (2.38 V) rising - provides reliable system reset signaling when output stabilizes within regulation band |
| Thermal Shutdown | 155°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
LM25011AMYX is housed in a thermally enhanced 10-pin HVSSOP (DGQ) package measuring 3.00 mm × 3.00 mm with an exposed pad soldered to PCB ground for improved thermal dissipation (RθJA = 48°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 6–42 V DC; requires low-ESR bulk capacitor placed adjacent to VIN/SGND pins |
| RT | On-time programming input | Resistor from VIN sets tON and thus switching frequency; max 2 mA current allowed |
| PGD | Open-drain power-good indicator | Asserts low when FB < 91% VREF; requires external pull-up ≤7 V for logic compatibility |
| SS | Soft-start timing node | Internal 10 µA current source charges external capacitor; minimum 1000 pF required |
| SGND | Signal ground reference | Reference for FB, RT, SS, PGD; must be separated from power ground paths to avoid noise coupling |
| FB | Feedback input | Compares output voltage divider to 2.51 V reference; bias current <100 nA minimizes divider error |
| CSG | Current-sense ground | Dedicated ground return for current-sense resistor; connects to PCB ground plane near RS |
| CS | Current-sense input | Monitors voltage across external sense resistor during off-time; threshold = –130 mV |
| SW | Switching node | Connects to inductor, diode cathode, and BST capacitor; high dv/dt node requiring tight layout |
| BST | Bootstrap supply | 0.1 µF capacitor between BST and SW supplies gate driver; recharged during off-time via internal diode |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network; enables ceramic output capacitors and ultra-fast load transient response (<1 µs) |
| Adjustable Valley Current Limit | Allows optimization of inductor size and saturation margin by tuning sense resistor - reduces BOM cost and board area |
| Integrated 2-A N-Channel Buck Switch | Reduces external component count; RDS(ON) = 0.6 Ω max ensures <1.2 W conduction loss at 2 A |
| Power-Good (PGD) Output | Provides system-level fault signaling with 3.3% hysteresis - enables safe power sequencing in multi-rail systems |
| Bootstrap Gate Driver with Pre-Charge | Maintains gate drive voltage during light-load discontinuous conduction mode; prevents erratic switching at low duty cycles |
Applications
| Automotive Front Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers 3.3-V image sensor and ISP in ADAS front-facing camera module under varying battery conditions (6–16 V). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V at up to 1.5 A with fast transient response to handle burst-mode sensor readouts. Use Value: COT topology maintains regulation during rapid load steps; PGD synchronizes sensor initialization with power stability. | Use Scenario: Generates 5-V core supply for navigation MCU and audio codec in automotive head unit with 12-V battery input. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating at 1.2 MHz to minimize EMI and enable compact 2.2-µH inductor. Use Value: Adjustable current limit allows use of smaller inductor; thermal shutdown prevents damage during prolonged high-temp operation. |
| Telecom Remote Radio Unit (RRU) | Industrial PLC I/O Module Bias Supply |
Use Scenario: Provides isolated 12-V auxiliary bias for GaN PA drivers in 4G/5G remote radio units powered from 48-V backplane. IC Role / Device Role / Timing Role: Non-isolated buck stage stepping down 48 V to 12 V with high input voltage tolerance and robust UVLO (4.6–5.9 V). Use Value: 42-V absolute max rating withstands telecom transients; 2-MHz capability reduces filter size in space-constrained RRU enclosures. | Use Scenario: Supplies 3.3-V logic rail for digital I/O isolators and ADCs in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Industrial-grade buck regulator supporting extended temperature range (–40°C to +125°C) and long-term reliability. Use Value: Exposed thermal pad ensures stable operation at full load in sealed enclosures; soft-start prevents inrush into downstream capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011AAMYX | Shorter minimum off-time (75 ns vs. 150 ns); enables higher switching frequency at low VIN | Preferred for >1.5 MHz designs with 6–12 V input; not drop-in due to different tON vs. RT curve | Select LM25011AAMYX only when high-frequency operation below 12 V is required; verify RT value per datasheet Figure 3 |
| LM5116MHX/NOPB | Current-mode controller (not integrated switch); supports up to 100 V input; requires external high-side FET | Suitable for >42 V inputs or higher current (>5 A); adds complexity but improves thermal scalability | Choose LM5116MHX/NOPB for ultra-high input voltage or parallel-FET scalability; LM25011AMYX preferred for simplicity and cost-sensitive 2-A designs |
Compared with LM25011AAMYX, the LM25011AMYX offers longer minimum off-time for better bootstrap recharge at low duty cycles, while LM5116MHX/NOPB trades integration for wider input range and higher power capability - making LM25011AMYX optimal for compact, cost-sensitive 2-A automotive and industrial bias supplies.
Availability
LM25011AMYX is available at Aetrix Electronics and suitable for automotive safety systems, infotainment head units, telecom remote radio units, and industrial PLC I/O modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM25011AMYX 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 designing analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM25011 family targets high-voltage DC/DC conversion in space- and cost-constrained applications, emphasizing ease of design, fast transient response, and robust operation across harsh automotive and industrial environments.
FAQ
What is the maximum input voltage rating for LM25011AMYX?
The LM25011AMYX has an absolute maximum input voltage rating of 45 V, with recommended operating range from 6 V to 42 V. This makes it suitable for automotive applications experiencing cold-crank (down to 6 V) and load-dump (up to 42 V) events. Operation beyond 42 V is not recommended for continuous use, though brief transients up to 45 V will not cause immediate damage if duration is limited per TI's handling ratings.
Does LM25011AMYX require external compensation components?
No, LM25011AMYX does not require external compensation components. Its constant on-time (COT) control architecture eliminates the need for loop compensation networks, simplifying design and improving stability with ceramic output capacitors. This feature is intrinsic to the LM25011AMYX's internal regulation circuitry and is confirmed in the Functional Block Diagram and Feature Description sections of the official datasheet.
How is the switching frequency set on LM25011AMYX?
The switching frequency of LM25011AMYX is set by an external resistor (RT) connected between VIN and the RT pin. The on-time tON is inversely proportional to VIN and determined by RT, yielding nearly constant frequency across input and load variations. For example, with VIN = 12 V and RT = 50 kΩ, typical tON is 200 ns - corresponding to ~1.1 MHz. Full calculation formulas and curves are provided in Section 7.3.2 of the LM25011AMYX datasheet.
What is the purpose of the CSG pin on LM25011AMYX?
CSG (Current Sense Ground) on LM25011AMYX is a dedicated ground return for the current-limit sensing circuit, separate from SGND. It must be connected directly to the ground side of the external current-sense resistor (RS) and tied to the PCB ground plane at a single point near RS to prevent noise coupling into the sensitive –130 mV current-limit threshold comparator. This separation ensures accurate valley-current detection independent of signal ground noise.
Can LM25011AMYX be used in automotive AEC-Q100 qualified designs?
LM25011AMYX itself is not AEC-Q100 qualified; however, the pin-compatible LM25011QMYX (or LM25011-Q1 variants) are AEC-Q100 Grade 1 qualified (–40°C to +125°C). LM25011AMYX shares identical electrical specifications and pinout but lacks automotive qualification documentation and screening. For production automotive applications, LM25011QMYX is the appropriate choice - LM25011AMYX is intended for industrial and commercial use where AEC-Q100 compliance is not required.
LM25011AMYX 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
LM25011AMYX FAQ
1.How can I place an order for LM25011AMYX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25011AMYX 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 LM25011AMYX reliable?
The price and inventory of LM25011AMYX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25011AMYX is usually 5 days.
3.What payment methods are accepted for LM25011AMYX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25011AMYX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25011AMYX?
LM25011AMYX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25011AMYX 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 LM25011AMYX?
For technical support, including LM25011AMYX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25011AMYX requirements.
6.How does Aetrix verify that LM25011AMYX is sourced from the original manufacturer or authorized distributors?
All LM25011AMYX 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 LM25011AMYX meets industry standards.
7.What is the process for return or replacement of LM25011AMYX?
All LM25011AMYX units undergo pre-shipment inspection (PSI). If there is an issue with LM25011AMYX, 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 LM25011AMYX part is unused and in its original packaging.
Return procedure for LM25011AMYX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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