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Texas Instruments LM25011AMY
- Part No.:
- LM25011AMY
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM25011AMY.pdf
- Description:
- IC REG BUCK ADJ 2A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,001
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Product details
Overview
LM25011AMY from Texas Instruments is a 42-V, 2-A constant on-time (COT) synchronous buck DC/DC 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, and supports switching frequencies up to 2 MHz for automotive infotainment power rails.
For engineers reviewing the LM25011AMY datasheet, LM25011AMY pinout, LM25011AMY application, or LM25011AMY equivalent, key selection considerations include its COT topology's ultra-fast transient response, valley current limit adjustability for inductor sizing, power-good (PGD) signaling, and HVSSOP-10 package thermal performance with exposed pad.
Technical Context
The LM25011AMY implements constant-on-time control with VIN-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 FB.
It integrates a high-side N-channel buck switch with bootstrap gate drive (BST/SW pins), gate UVLO (2.4–4.4 V), pre-charge circuitry, and thermal shutdown (155°C). The PGD output asserts high when FB reaches ≥95% of 2.51 V, with 3.3% hysteresis and external pull-up requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports 12 V/24 V automotive battery systems with 45 V absolute max rating. |
| Output Current | Up to 2 A continuous - limited by thermal design and RDS(ON) (0.3–0.6 Ω) of integrated N-MOSFET. |
| Feedback Reference | 2.51 V ±2% - sets output voltage via RFB1/RFB2; enables precise regulation down to 2.51 V. |
| Switching Frequency | Adjustable up to 2 MHz - set by RT resistor; tON = 75–250 ns depending on VIN and RT value. |
| Current Limit Threshold | –130 mV at CS pin - defines valley current limit; allows inductor size reduction via adjustable RS. |
| Power Good Accuracy | ±5% window around 2.51 V - PGD asserts when FB ≥ 2.385 V; hysteresis prevents chatter during startup. |
| Thermal Shutdown | 155°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Package | HVSSOP-10 (3.0 mm × 3.0 mm) with exposed thermal pad - RθJA = 48°C/W; requires soldered ground pad for thermal integrity. |
Pinout & Package
HVSSOP-10 package with 3.0 mm × 3.0 mm body and exposed thermal pad (EP) on underside, requiring direct solder connection to PCB ground plane for thermal management and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Primary power input (6–42 V); requires low-ESR capacitor placed adjacent to VIN/SGND pins. |
| RT | On-time programming | Resistor from VIN sets tON and switching frequency; max 2 mA current into pin. |
| PGD | Power good open-drain output | Active-high signal when FB ≥ 95% of 2.51 V; requires external pull-up ≤7 V. |
| SS | Soft-start control | Internal 10 µA current source charges external capacitor; 0.5–2.6 V range supports tracking applications. |
| SGND | Signal ground | Reference for FB, RT, SS, PGD; separate from CSG to avoid current-sense noise coupling. |
| FB | Feedback input | Compares to 2.51 V reference; output voltage set by RFB1/RFB2 divider per VOUT = 2.51×(1+RFB1/RFB2). |
| CSG | Current sense ground | Dedicated ground return for current-sense path; must connect to RS and system ground at single point. |
| CS | Current sense input | Monitors voltage across external sense resistor RS during off-time; threshold = –130 mV. |
| SW | Switching node | Drain of internal N-MOSFET; connects to inductor, diode cathode, and BST capacitor. |
| BST | Bootstrap supply | Connects 0.1 µF capacitor to SW; supplies gate drive voltage during on-time via internal charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation components; enables stable operation with ceramic output capacitors and fast load-step response. |
| Adjustable Valley Current Limit | Set via RS to optimize inductor size and peak current; avoids foldback and enables smooth CV-to-CC transition. |
| Integrated 2-A N-Channel Buck Switch | Reduces BOM count and layout area; RDS(ON) = 0.3–0.6 Ω ensures <1 W conduction loss at 2 A. |
| Power Good (PGD) Output | Provides system-level sequencing and fault indication; logic-compatible with 3.3 V/5 V controllers. |
| Adjustable Soft-Start | Prevents inrush current and output overshoot; timing set by external CSS capacitor (≥1000 pF). |
| Thermal Shutdown with Hysteresis | Protects against sustained overloads; 20°C hysteresis prevents thermal cycling near trip point. |
Applications
| Automotive Infotainment | ADAS Front Camera Power |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V bias rail for display controllers, audio codecs, and USB hubs in head units. IC Role / Device Role / Timing Role: Primary buck regulator delivering 2 A at high efficiency across cold-crank (6 V) to load-dump (42 V) conditions. Use Value: COT topology maintains stable 2 MHz operation during rapid battery transients, minimizing output voltage deviation. | Use Scenario: Powers image sensor and ISP in front-facing ADAS cameras requiring clean, sequenced 1.8 V/2.8 V rails. IC Role / Device Role / Timing Role: High-voltage input buck converter with PGD for system reset coordination and soft-start for controlled power-up. Use Value: Adjustable current limit enables use of smaller inductors in space-constrained camera modules without sacrificing short-circuit robustness. |
| Telecom Remote Radio Unit | Industrial PLC I/O Module |
Use Scenario: Generates isolated 12 V intermediate bus from 48 V telecom supply for downstream DC/DC converters. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating at 1.2 MHz to minimize EMI in dense RF environments. Use Value: Minimum off-time of 90 ns and VIN-compensated tON ensure consistent frequency and low jitter under varying line/load conditions. | Use Scenario: Provides 5 V/3.3 V power for microcontroller, CAN transceiver, and analog front-end in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust primary regulator with thermal shutdown and UVLO for unattended industrial operation. Use Value: Exposed-pad HVSSOP package achieves 48°C/W θJA, enabling 2 A output without forced air in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011AAMY | Shorter minimum off-time (52–93 ns vs. 90–208 ns); optimized for higher-frequency operation at low VIN. | Preferred for designs targeting >1.5 MHz at VIN ≤ 12 V; requires external ripple injection at FB pin. | Select LM25011AAMY when higher switching frequency and tighter VIN range justify added external component complexity. |
| LM25088MY | Wider input range (4.5–45 V); higher current capability (3 A); no integrated switch - external MOSFET required. | Suitable for higher-power or lower-VIN applications where external FETs improve thermal flexibility. | Choose LM25088MY only if 3 A output or sub-6 V start-up is required; adds gate driver, FET, and layout complexity. |
Compared with LM25011AMY, LM25011AAMY enables higher-frequency operation below 12 V but mandates external ripple; LM25088MY offers greater current and lower VIN support at the cost of external FET integration and reduced integration density.
Availability
LM25011AMY is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC power supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LM25011AMY 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 company specializing in analog, embedded processing, and power management ICs, with leadership in automotive, industrial, and communications markets.
The LM25011AMY belongs to TI's high-voltage buck regulator product line, designed specifically for robust, compact, and efficient DC/DC conversion in automotive and industrial environments with wide input voltage ranges.
FAQ
What is the recommended input capacitor for LM25011AMY?
A low-ESR ceramic or polymer capacitor ≥10 µF should be placed as close as possible between VIN and SGND pins to suppress high-frequency switching noise and support transient current demands. TI recommends paralleling with a 100 nF ceramic capacitor for optimal HF decoupling. Layout proximity to VIN/SGND is critical-trace inductance directly impacts stability and EMI performance of the LM25011AMY.
Does LM25011AMY require external compensation components?
No, LM25011AMY uses constant-on-time (COT) control architecture, eliminating the need for external compensation networks. Its regulation loop is inherently stable with ceramic output capacitors due to internal ripple generation (ERM), simplifying design and reducing bill-of-materials. This architecture is confirmed in the functional block diagram and "No Loop Compensation Required" feature listing for the LM25011AMY.
How is the switching frequency set on LM25011AMY?
The switching frequency of LM25011AMY is set by an external resistor (RT) connected between VIN and the RT pin. The on-time tON is inversely proportional to VIN and RT value (e.g., tON ≈ 200 ns at VIN = 12 V, RT = 50 kΩ), resulting in near-constant frequency across line/load. Equation-based calculation and typical curves are provided in Section 7.3.2 of the LM25011AMY datasheet.
What is the function of the CSG pin on LM25011AMY?
The CSG (Current Sense Ground) pin on LM25011AMY provides a dedicated, low-noise ground return path for the current-sense amplifier, isolating it from signal ground (SGND) to prevent noise coupling into the sensitive CS comparator. It must be connected to both the current-sense resistor (RS) and system ground at a single point-typically at the RS ground end-to maintain accurate valley current limit detection in the LM25011AMY.
Can LM25011AMY be used in AEC-Q100 automotive applications?
The LM25011AMY is not AEC-Q100 qualified; only the LM25011-Q1 and LM25011A-Q1 variants meet AEC-Q100 Grade 1 (–40°C to +125°C) requirements. LM25011AMY is rated for –40°C to +125°C junction temperature but lacks automotive qualification testing and documentation. For safety-critical automotive use, specify LM25011Q1MY or LM25011AQ1MY instead of LM25011AMY.
LM25011AMY 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
LM25011AMY FAQ
1.How can I place an order for LM25011AMY through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25011AMY 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 LM25011AMY reliable?
The price and inventory of LM25011AMY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25011AMY is usually 5 days.
3.What payment methods are accepted for LM25011AMY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25011AMY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25011AMY?
LM25011AMY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25011AMY 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 LM25011AMY?
For technical support, including LM25011AMY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25011AMY requirements.
6.How does Aetrix verify that LM25011AMY is sourced from the original manufacturer or authorized distributors?
All LM25011AMY 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 LM25011AMY meets industry standards.
7.What is the process for return or replacement of LM25011AMY?
All LM25011AMY units undergo pre-shipment inspection (PSI). If there is an issue with LM25011AMY, 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 LM25011AMY part is unused and in its original packaging.
Return procedure for LM25011AMY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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