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Texas Instruments LM25011AQ1MYX/NOPB
- Part No.:
- LM25011AQ1MYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM25011AQ1MYX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
LM25011AQ1MYX/NOPB from Texas Instruments is an automotive-grade 42-V, 2-A constant-on-time (COT) buck switching 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, supports up to 2 MHz switching frequency, and delivers regulated output voltage with power-good indication. Used in automotive front camera and infotainment power rails where high input voltage tolerance and fast transient response are required.
For engineers reviewing the LM25011AQ1MYX/NOPB datasheet, LM25011AQ1MYX/NOPB pinout, LM25011AQ1MYX/NOPB application, or LM25011AQ1MYX/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), valley current limit adjustability for inductor sizing, COT topology eliminating loop compensation, and bootstrap-based gate drive enabling high-side N-MOSFET operation in compact HVSSOP-10 packages.
Technical Context
The LM25011AQ1MYX/NOPB implements constant-on-time control with VIN-dependent on-time (tON ∝ 1/VIN) and programmable minimum off-time - 90 ns for LM25011, 75 ns for LM25011A variant - enabling near-constant switching frequency across line and load. Its valley current limit detection uses CS/CSG pins to sense recirculating inductor current during off-time, triggering cycle-by-cycle on-time reduction only in LM25011 (not LM25011A).
It integrates a 5-V startup regulator, gate driver pre-charge circuit, BST-SW bootstrap capacitor interface (0.1 µF), and thermal shutdown at 155°C. The PGD output asserts high when FB reaches ≥95% of 2.51 V, with 3.3% hysteresis, and requires external pull-up to <7 V.
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 transient tolerance. |
| Output Current | Up to 2 A continuous - limited by internal N-MOSFET RDS(ON) (0.3–0.6 Ω) and thermal design using exposed pad. |
| Feedback Reference | 2.51 V ±2% - sets output via resistor divider; enables precise VOUT = 2.51 × (1 + RFB1/RFB2). |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - higher than LM25011 due to shorter min off-time (75 ns vs 90 ns). |
| Current Limit Threshold | –130 mV at CS pin - defines valley current limit; allows inductor sizing based on peak-to-average margin. |
| Power Good Accuracy | ±5% regulation window (91–95% of VREF) - provides reliable system enable signaling without external monitoring. |
| Thermal Shutdown | 155°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal layout. |
Pinout & Package
Package: 10-pin HVSSOP (3.00 mm × 3.00 mm) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation (RθJA = 48°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Primary power input (6–42 V); requires low-ESR capacitor placed adjacent to VIN/SGND. |
| RT | On-time programming | Resistor from VIN sets tON and switching frequency; max 2 mA current into pin. |
| PGD | Power good open-drain output | Asserts high when FB ≥ 95% of 2.51 V; needs external pull-up ≤7 V. |
| SS | Soft-start control | Internal 10 µA current source charges external capacitor; also supports tracking function (0.5–2.6 V range). |
| 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 internal reference; regulates output via external resistor divider. |
| 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 | Senses voltage across external sense resistor RS during off-time to detect valley current limit. |
| SW | Switching node | Connects to inductor, diode cathode, and BST capacitor; carries high dv/dt switching waveform. |
| BST | Bootstrap supply | Connects to SW via 0.1 µF capacitor; supplies gate drive voltage for high-side N-MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation - meets automotive safety-critical power rail requirements. |
| Constant-on-time (COT) control | Eliminates need for external compensation network - simplifies design and improves load transient response. |
| Adjustable valley current limit | Enables smaller inductor selection by setting peak current margin independently of output voltage and load. |
| Ceramic-capacitor compatible | Stable with low-ESR ceramic output capacitors - reduces solution size and cost versus electrolytic alternatives. |
| Integrated bootstrap gate driver | Supports high-side N-MOSFET with internal pre-charge and UVLO - avoids external high-voltage level shifters. |
Applications
| Automotive Front Camera | Infotainment System Core Rail |
|---|---|
Use Scenario: Powering 5-MP image sensor and ISP in ADAS front-facing camera module exposed to engine bay temperature extremes. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V bias regulator delivering stable 2-A output with fast transient response to handle burst-mode sensor readout. Use Value: AEC-Q100 Grade 1 rating ensures reliability at 125°C junction; PGD signal synchronizes sensor initialization with valid rail establishment. | Use Scenario: Generating core 1.2-V or 1.8-V supply for SoC in vehicle infotainment head unit with wide-input 12 V battery supply. IC Role / Device Role / Timing Role: High-efficiency buck converter operating up to 2 MHz to minimize EMI and allow small external components. Use Value: Adjustable current limit permits optimized inductor sizing for space-constrained dashboard layout; COT architecture maintains regulation during rapid CPU load changes. |
| Telematics Control Unit (TCU) | Automotive Safety Domain Controller |
Use Scenario: Providing isolated 3.3-V auxiliary rail for LTE modem and GNSS receiver in cellular-connected TCU modules. IC Role / Device Role / Timing Role: Secondary buck regulator accepting unregulated 12 V–24 V input with robust input UVLO (4.6–5.9 V threshold). Use Value: 45 V absolute max input rating handles load-dump transients; soft-start prevents inrush current during cold cranking recovery. | Use Scenario: Supplying 5-V rail to safety-critical microcontroller and CAN transceivers in ISO 26262-compliant domain controller. IC Role / Device Role / Timing Role: Fault-tolerant power stage with thermal shutdown, PGD monitoring, and current limit protection. Use Value: Power-good assertion confirms regulation before MCU boot; thermal hysteresis prevents oscillation during sustained overload conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011Q1MYX/NOPB | Same pinout and package; lacks LM25011A's shorter minimum off-time (90 ns vs 75 ns), limiting max frequency at low VIN. | Lower-frequency designs (<1.5 MHz) where AEC-Q100 Grade 1 compliance is required but high-frequency operation is not critical. | Select when cost sensitivity outweighs need for 2 MHz operation; retains identical thermal and current-limit behavior. |
| LM61480QRNXTQ1 | 42-V, 8-A synchronous buck with integrated FETs; uses current-mode control and requires compensation; 16-pin QFN. | Higher-current applications (>2 A) requiring lower thermal footprint and no external diode; not drop-in compatible. | Choose for scalable power delivery where board space allows larger package and design effort for loop compensation is acceptable. |
Compared with LM25011Q1MYX/NOPB, LM25011AQ1MYX/NOPB enables higher-frequency operation at low input voltages due to its 75 ns minimum off-time, while LM61480QRNXTQ1 offers higher current capability and synchronous rectification at the cost of increased complexity and non-pin-compatible packaging.
Availability
LM25011AQ1MYX/NOPB is available at Aetrix Electronics and suitable for automotive front camera, infotainment system core rail, and telematics control unit applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM25011AQ1MYX/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.
The LM25011A-Q1 product line delivers high-voltage, constant-on-time buck regulators optimized for automotive subsystems requiring robustness, fast transient response, and minimal external components - especially in ADAS and infotainment power domains.
FAQ
What is the maximum switching frequency supported by LM25011AQ1MYX/NOPB?
The LM25011AQ1MYX/NOPB supports switching frequencies up to 2 MHz, enabled by its shorter minimum off-time of 75 ns (vs 90 ns for LM25011). This allows higher-frequency operation at low input voltages where duty cycle constraints would otherwise limit frequency. The actual frequency is set by the RT resistor and input voltage per the formula tON = (VIN)/(4.1×10⁻¹¹×(RT+500)) + 15 ns.
How does the current limit function differ between LM25011AQ1MYX/NOPB and LM25011Q1MYX/NOPB?
The LM25011AQ1MYX/NOPB uses valley current limit detection at the CS pin with a –130 mV threshold but does not reduce on-time during current limit events. In contrast, the LM25011Q1MYX/NOPB reduces on-time by ~40% when current limit is detected - a feature absent in the LM25011A variant. Both share identical current-sense architecture and threshold accuracy.
Is LM25011AQ1MYX/NOPB pin-compatible with LM25011Q1MYX/NOPB?
Yes, LM25011AQ1MYX/NOPB is pin-compatible with LM25011Q1MYX/NOPB - both use the same 10-pin HVSSOP package, identical pinout, and share all functional pin definitions. The difference lies solely in internal timing parameters (minimum off-time), requiring no PCB layout change when upgrading from LM25011Q1MYX/NOPB to LM25011AQ1MYX/NOPB.
What external components are mandatory for basic LM25011AQ1MYX/NOPB operation?
Mandatory external components for LM25011AQ1MYX/NOPB include: input capacitor (CIN) near VIN/SGND, output capacitor (COUT), bootstrap capacitor (0.1 µF between BST and SW), current-sense resistor (RS), feedback resistors (RFB1, RFB2), soft-start capacitor (≥1000 pF on SS), and RT resistor. An external Schottky diode (D1) is required unless using synchronous rectification externally.
Does LM25011AQ1MYX/NOPB require external ripple injection for stable operation?
No - unlike the LM25011A (non-Q1) variant, the LM25011AQ1MYX/NOPB does not require external ripple injection at the FB pin. Its internal emulated ripple mode (ERM) generates sufficient ripple from the CS pin waveform for stable COT operation across its full operating range, including at 2 MHz.
LM25011AQ1MYX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-PowerPad
LM25011AQ1MYX/NOPB FAQ
1.How can I place an order for LM25011AQ1MYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25011AQ1MYX/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 LM25011AQ1MYX/NOPB reliable?
The price and inventory of LM25011AQ1MYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25011AQ1MYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25011AQ1MYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25011AQ1MYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25011AQ1MYX/NOPB?
LM25011AQ1MYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25011AQ1MYX/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 LM25011AQ1MYX/NOPB?
For technical support, including LM25011AQ1MYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25011AQ1MYX/NOPB requirements.
6.How does Aetrix verify that LM25011AQ1MYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25011AQ1MYX/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 LM25011AQ1MYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25011AQ1MYX/NOPB?
All LM25011AQ1MYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25011AQ1MYX/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 LM25011AQ1MYX/NOPB part is unused and in its original packaging.
Return procedure for LM25011AQ1MYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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