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Texas Instruments LM25011AMYE
- Part No.:
- LM25011AMYE
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM25011AMYE.pdf
- Description:
- IC REG BUCK ADJ 2A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
LM25011AMYE from Texas Instruments is a 42-V, 2-A constant on-time (COT) synchronous buck regulator IC with integrated 2-A N-channel MOSFET switch, adjustable current limit, and power-good output. It operates from 6 V to 42 V input, delivers adjustable output voltage starting at 2.51 V, supports up to 2 MHz switching frequency, and targets automotive and industrial DC/DC bias supply applications.
For engineers reviewing the LM25011AMYE datasheet, LM25011AMYE pinout, LM25011AMYE application, or LM25011AMYE equivalent, key selection considerations include its COT topology for ultra-fast transient response, valley current limit adjustability for inductor sizing, bootstrap gate drive architecture, thermal shutdown, and AEC-Q100 Grade 1 qualification of its -Q1 variant - all validated for high-reliability 12 V/24 V/42 V systems.
Technical Context
The LM25011AMYE implements constant on-time control with VIN-dependent tON (tON = 15 ns + (VIN × 4.1×10−11)/(RT + 500 Ω)), enabling near-constant switching frequency across line and load. Its off-time is governed by a minimum off-time one-shot timer (75 ns typical for LM25011A), critical for stable high-frequency operation and bootstrap capacitor recharge.
Current limiting uses valley detection via the CS/CSG pins with −130 mV threshold; the LM25011A variant omits the 40% on-time reduction during current limit present in LM25011. Regulation relies on a precision 2.51 V ±2% internal reference at FB, with PGD asserting when FB reaches ≥95% of VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports 12 V, 24 V, and 42 V automotive and industrial rails with 45 V absolute max rating. |
| Output Current | Up to 2 A continuous - determined by thermal design and external components; peak switch current rated at 3.5 A. |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - enables compact magnetics and EMI optimization. |
| Feedback Reference | 2.51 V ±2% - sets output voltage accuracy; VOUT = 2.51 V × (RFB1 + RFB2)/RFB1. |
| Minimum Off-Time | 75 ns (typical) - enables high-frequency operation at low VIN; shorter than LM25011's 150 ns, distinguishing LM25011A. |
| Power Good Threshold | FB ≥ 95% of VREF (≈2.38 V) - provides reliable output regulation monitoring with hysteresis. |
| Current Limit Threshold | −130 mV at CS pin - enables precise, adjustable valley current limiting using external sense resistor RS. |
Pinout & Package
LM25011AMYE 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 thermal performance (RθJA = 48 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 6–42 V; requires local low-ESR capacitor to SGND for stability and noise suppression. |
| 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 high when FB ≥ 95% of 2.51 V; requires external pull-up ≤7 V. |
| SS | Soft-start timing input | Internal 10 µA current source charges external CSS; enables controlled startup and tracking. |
| SGND | Signal ground reference | Reference for FB, RT, SS, PGD; separate from CSG to avoid current-sense noise coupling. |
| FB | Feedback input | Compares against 2.51 V reference; sets output voltage via resistive divider (RFB1/RFB2). |
| CSG | Current-sense ground | Ground return for CS pin; must be connected to system ground and RS low-side node. |
| CS | Current-sense input | Monitors voltage across external sense resistor RS during off-time for valley current limit. |
| SW | Switching node output | Connects to inductor, diode cathode, and BST capacitor; carries high dv/dt and high-current pulses. |
| BST | Bootstrap supply input | Connects to 0.1 µF capacitor between BST and SW; supplies gate driver during high-side conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates loop compensation, enables ceramic output capacitors, ensures fast load transients and stable operation across input/output variations. |
| Adjustable Valley Current Limit | Configurable via RS value; allows smaller inductors and smooth CV-to-CC transition without foldback. |
| Integrated 2-A N-Channel Buck Switch | Reduces BOM count and layout complexity; RDS(ON) = 0.6 Ω max simplifies thermal management at 2 A. |
| Bootstrap Gate Drive Architecture | Enables high-side N-MOSFET drive using external BST capacitor; supports high duty cycles and efficient 42 V step-down. |
| Thermal Shutdown & UVLO | Protects against overtemperature (155 °C trip) and undervoltage (5.3 V nominal VIN UVLO); includes hysteresis for robust restart. |
Applications
| Automotive Front Camera Power Supply | Industrial 24 V Bias Rail |
|---|---|
Use Scenario: Powers image sensor and ISP in ADAS front camera modules requiring clean, regulated 3.3 V or 5 V from 12 V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing 2 A output with COT-based fast transient response to handle burst-mode sensor activity. Use Value: Maintains regulation during 6 V cold-crank dips; PGD enables system reset coordination; adjustable current limit avoids inductor saturation under fault. | Use Scenario: Generates isolated 5 V/3.3 V bias for PLC I/O modules or motor drives operating from unregulated 24 V industrial bus. IC Role / Device Role / Timing Role: High-voltage buck controller delivering stable output despite 24 V rail ripple and load steps up to 2 A. Use Value: 42 V abs max rating handles 24 V transients; 2 MHz capability minimizes filter size; thermal shutdown prevents field failures in enclosed enclosures. |
| Telecom Remote Radio Unit (RRU) | Infotainment System Core Logic Supply |
Use Scenario: Supplies 1.2 V/1.8 V core power to FPGAs or DSPs in outdoor telecom RRUs powered from 48 V PoE-derived rails. IC Role / Device Role / Timing Role: Secondary-stage buck regulator stepping down intermediate 12 V rail to low-voltage logic supplies. Use Value: COT topology ensures sub-µs response to dynamic FPGA core current demands; soft-start prevents inrush into large downstream capacitance. | Use Scenario: Provides 1.1 V CPU core and 1.8 V memory supply in automotive infotainment head units fed from 12 V battery. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter supporting ASIL-B functional safety requirements via PGD monitoring. Use Value: PGD signal validates output before SoC boot; AEC-Q100 Grade 1 qualification (via LM25011A-Q1) supports automotive deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011MYE | Longer minimum off-time (150 ns vs 75 ns); lower max switching frequency at low VIN; retains 40% on-time reduction in current limit. | Less suitable for >1.5 MHz designs at 6–12 V input; better for cost-sensitive non-high-frequency applications. | Select LM25011MYE only if 2 MHz operation is unnecessary and legacy design compatibility is required. |
| LM25011AQ1MYE | Identical electrical specs to LM25011AMYE but qualified per AEC-Q100 Grade 1 (−40°C to +125°C TJ) and with enhanced ESD/HTOL screening. | Required for automotive safety-critical systems (e.g., ADAS, infotainment); not needed for commercial/industrial use. | Choose LM25011AQ1MYE when automotive qualification and extended temperature operation are mandatory. |
Compared with LM25011MYE, LM25011AMYE enables higher-frequency operation at low input voltages due to its shorter minimum off-time, while LM25011AQ1MYE adds automotive qualification without altering electrical behavior - making LM25011AMYE the optimal choice for high-performance industrial and non-automotive automotive designs.
Availability
LM25011AMYE is available at Aetrix Electronics and suitable for automotive front camera power supplies, industrial 24 V bias rails, telecom remote radio units, and infotainment system core logic supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM25011AMYE 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 and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.
The LM25011 family was designed to deliver high-voltage, high-efficiency buck regulation for demanding 12 V–42 V systems where fast transient response, small solution size, and reliability are critical - especially in space-constrained automotive and industrial applications.
FAQ
What is the maximum switching frequency achievable with LM25011AMYE?
The LM25011AMYE supports switching frequencies up to 2 MHz, set by the RT resistor and input voltage per tON = 15 ns + (VIN × 4.1×10−11)/(RT + 500 Ω). Its 75 ns minimum off-time enables stable 2 MHz operation even at low VIN (e.g., 6 V), distinguishing it from the standard LM25011. Designers must verify bootstrap capacitor recharge time and inductor DCR effects at high frequencies. The LM25011AMYE datasheet specifies this limit under recommended operating conditions.
How does the current limit function differ between LM25011AMYE and LM25011MYE?
The LM25011AMYE uses valley current sensing at the CS pin with a −130 mV threshold but does not reduce on-time during current limit events. In contrast, the LM25011MYE reduces tON by ~40% when current limit is detected - a feature omitted in the LM25011A variant to improve high-frequency stability. This makes LM25011AMYE more predictable in constant-frequency COT operation but requires careful RS selection to avoid overcurrent stress. Both share identical current limit threshold specifications.
Can LM25011AMYE operate with ceramic output capacitors?
Yes, LM25011AMYE is fully compatible with ceramic output capacitors due to its constant on-time control architecture, which eliminates the need for loop compensation and remains stable with low-ESR ceramics. The datasheet explicitly confirms stable operation with ceramic capacitors and highlights reduced output capacitance requirements versus voltage-mode controllers. For optimal performance, ensure sufficient effective ripple at the CS pin (≥25 mVP-P) via proper inductor and RS selection - especially critical at high frequencies where LM25011AMYE excels.
What is the role of the BST and SW pins in LM25011AMYE's gate drive?
The BST and SW pins form the bootstrap gate drive network for LM25011AMYE's integrated N-channel high-side buck switch. A 0.1 µF capacitor connects BST to SW; during SW low-time, the internal 5 V regulator recharges this capacitor through an internal diode. During SW high-time, BST supplies the gate driver. This architecture enables efficient high-side N-MOSFET drive without a dedicated floating supply. Proper layout - short traces, solid ground plane under the exposed pad - is essential to maintain BST voltage and prevent shoot-through or premature shutdown.
Does LM25011AMYE include built-in protection features?
Yes, LM25011AMYE integrates multiple protection functions: thermal shutdown (155 °C trip with 20 °C hysteresis), VIN undervoltage lockout (5.3 V nominal with 200 mV hysteresis), gate-drive UVLO (BST–SW < 2.4 V), and cycle-by-cycle current limiting via the CS/CSG pins. It also includes soft-start control, maximum duty-cycle limiting, and pre-charge circuitry to ensure reliable bootstrap capacitor charging. These protections are active during normal operation and fault conditions, enhancing system robustness without external components - a key advantage confirmed in the LM25011AMYE datasheet's Electrical Characteristics table.
LM25011AMYE 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
LM25011AMYE FAQ
1.How can I place an order for LM25011AMYE through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25011AMYE 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 LM25011AMYE reliable?
The price and inventory of LM25011AMYE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25011AMYE is usually 5 days.
3.What payment methods are accepted for LM25011AMYE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25011AMYE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25011AMYE?
LM25011AMYE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25011AMYE 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 LM25011AMYE?
For technical support, including LM25011AMYE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25011AMYE requirements.
6.How does Aetrix verify that LM25011AMYE is sourced from the original manufacturer or authorized distributors?
All LM25011AMYE 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 LM25011AMYE meets industry standards.
7.What is the process for return or replacement of LM25011AMYE?
All LM25011AMYE units undergo pre-shipment inspection (PSI). If there is an issue with LM25011AMYE, 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 LM25011AMYE part is unused and in its original packaging.
Return procedure for LM25011AMYE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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