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Texas Instruments LM25010SDX/NOPB
- Part No.:
- LM25010SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM25010SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
LM25010SDX/NOPB from Texas Instruments is a 42-V, 1-A step-down switching regulator with integrated N-channel buck switch and constant ON-time control architecture. It operates across 6 V to 42 V input, delivers up to 1 A output current, features 2.5 V ±2% feedback reference, valley current limit at 1.25 A, and programmable switching frequency up to 1 MHz. It is used in automotive electronics and telecom post-regulation where high-input-voltage DC-DC conversion with fast transient response is required.
For engineers reviewing the LM25010SDX/NOPB datasheet, LM25010SDX/NOPB pinout, LM25010SDX/NOPB application, or LM25010SDX/NOPB equivalent, key selection considerations include its wide 6–42 V input range, no-loop-compensation design, thermal shutdown (175°C), RON/SD shutdown control, and WSON-10 package with exposed thermal pad for industrial and automotive power supply designs.
Technical Context
The LM25010SDX/NOPB implements a constant ON-time regulation scheme that eliminates need for external loop compensation and enables ultra-fast load transient response. Its ON-time is inversely proportional to VIN and set by an external resistor on the RON/SD pin, enabling stable operating frequency across line and load variations.
It integrates a high-voltage bias regulator (VCC) that tracks VIN below 8.9 V and regulates at 7 V above that threshold, with internal UVLO (5.25 V), gate drive UVLO (1.7–4 V), and thermal shutdown (175°C). Current limiting is valley-based, sensing recirculating current through ISEN/SGND with 130 mΩ internal sense resistance and 150 ns response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports direct connection to 12 V, 24 V, and 36 V industrial and automotive battery rails. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh environments. |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting via external resistor divider (e.g., 3.3 V, 5 V, 12 V). |
| Valley Current Limit | 1.25 A typical - protects against overload and short-circuit while allowing peak currents up to 2 A on SW pin. |
| Switching Frequency | Up to 1 MHz - allows use of small external inductors (e.g., 2.2 µH) and ceramic output capacitors. |
| Thermal Shutdown | 175°C with 20°C hysteresis - disables buck switch and ON-timer to prevent permanent damage during fault conditions. |
| VCC Bias Regulator | 7 V regulated (VIN > 8.9 V); tracks VIN otherwise - reduces external bias supply requirement and simplifies system power architecture. |
Pinout & Package
LM25010SDX/NOPB is packaged in a thermally enhanced 10-pin WSON (DPR) package (4.00 mm × 4.00 mm) with exposed metal pad for PCB ground connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 6–42 V DC; requires local bypass capacitor between VIN and RTN for stability and EMI suppression. |
| SW | Switching node | Internally connected to source of N-channel buck switch; connects to inductor, freewheeling diode, and bootstrap capacitor. |
| BST | Bootstrap supply | Connects external capacitor (C4) between BST and SW to provide gate drive voltage for high-side N-FET driver. |
| ISEN | Current sense input | Senses recirculating inductor current during OFF-time; used for valley current limiting at 1.25 A. |
| SGND | Current sense ground | Return path for ISEN current; must be routed separately from power ground to avoid noise coupling into current sense path. |
| RTN | Analog ground return | Ground reference for internal regulation circuitry excluding current sense path; connects to system ground plane. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5 V reference; determines ON-time initiation and overvoltage protection (2.9 V threshold). |
| RON/SD | ON-time programming / shutdown | Resistor from VIN sets ON-time; grounding shuts down regulator and discharges SS capacitor. |
| SS | Soft-start control | Internal 11.5 µA current source charges external capacitor to ramp output voltage and limit inrush current. |
| VCC | Bias regulator output | Supplies internal circuitry; self-biased from VIN (6–8.9 V) or regulated at 7 V (VIN > 8.9 V); requires ≥0.47 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | Load step recovery within microseconds due to immediate ON-time retriggering when FB falls below 2.5 V. |
| Programmable soft start | External SS capacitor sets startup ramp time, preventing output overshoot and limiting inrush into bulk capacitance. |
| Integrated high-voltage bias regulator | Eliminates need for external LDO or charge pump; supports direct 6–42 V input without auxiliary supply. |
| Thermal shutdown with hysteresis | Auto-recovery at ~155°C prevents thermal runaway while avoiding oscillation near trip point. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in under-hood ECUs exposed to 12 V battery with load dump spikes. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 12 V–28 V battery rail to stable 3.3 V or 5 V for digital logic and analog peripherals. Use Value: Wide 6–42 V input range withstands cold crank (6.5 V) and load dump (40 V+); AEC-Q100 Grade 1 qualification ensures operation from –40°C to 125°C ambient. | Use Scenario: Generating isolated 5 V and 3.3 V rails from 24 V DC field bus in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Secondary-side post-regulator supplying clean, low-noise power to FPGA configuration circuits and ADC reference buffers. Use Value: No-loop-compensation design maintains regulation during rapid load steps from digital I/O switching; 1.25 A current limit protects against shorted outputs in modular I/O slots. |
| Telecom Remote Radio Unit | Commercial HVAC Controller |
Use Scenario: Converting 48 V PoE-derived or -48 V telecom supply to 3.3 V for RF front-end ICs and baseband processors in outdoor small cells. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 600 kHz to minimize EMI in dense RF environments. Use Value: Programmable frequency avoids sensitive RF bands; BST/SW bootstrap architecture enables efficient high-side N-FET drive without external gate driver. | Use Scenario: Providing regulated 5 V for MCU, display, and wireless communication (Wi-Fi/BLE) in wall-mounted smart thermostats powered from 24 VAC-to-DC adapters. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage replacing linear regulators to reduce heat buildup in sealed enclosures. Use Value: WSON-10 package with exposed pad enables conduction cooling through PCB; thermal shutdown prevents failure during extended high-temperature operation (>60°C ambient). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011SDX/NOPB | Same family; rated for 2.5 A output current; higher RDS(ON) (0.2 Ω typ) but larger HTSSOP-14 package. | Supports higher load currents; requires larger board area and different thermal management strategy. | Select when >1 A continuous load or higher peak current margin is required; not pin-compatible with LM25010SDX/NOPB. |
| TPS54160DGQR | 60 V input, 1.5 A output; current-mode control; requires external compensation; 2.97–60 V input range. | Better suited for ultra-wide input (e.g., solar/battery hybrid systems); slower transient response than constant ON-time architecture. | Choose when input may exceed 42 V or when design already uses TI's WEBENCH tools for current-mode compensation; different pinout and layout. |
Compared with LM25010SDX/NOPB, LM25011SDX/NOPB offers higher current capability but sacrifices compact WSON-10 footprint, while TPS54160DGQR extends input voltage range and adds flexibility at the cost of compensation complexity and reduced transient performance.
Availability
LM25010SDX/NOPB is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, telecom remote radio units, and commercial HVAC controllers requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for LM25010SDX/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM25010SDX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for robust, compact DC-DC conversion in automotive and industrial environments where wide input range, reliability, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM25010SDX/NOPB?
The absolute maximum input voltage (VIN to RTN) for LM25010SDX/NOPB is 45 V, with recommended operating range specified as 6 V to 42 V. Operation beyond 42 V is not advised for sustained use, as it exceeds the validated design margin and may impact long-term reliability or trigger overvoltage stress on internal structures such as the VCC regulator or gate driver.
Does LM25010SDX/NOPB require external compensation components?
No, LM25010SDX/NOPB does not require external compensation components. Its constant ON-time control architecture inherently provides stable regulation without feedback loop compensation networks, simplifying design and improving load transient response. This eliminates the need for external Type II or Type III compensation capacitors and resistors typically required in voltage-mode or current-mode buck controllers.
How is the switching frequency set on LM25010SDX/NOPB?
The switching frequency of LM25010SDX/NOPB is set indirectly via the RON resistor connected between VIN and the RON/SD pin. The ON-time is determined by VIN and RON value, and frequency varies inversely with VIN. For example, with RON = 200 kΩ, typical ON-time ranges from 500 ns (VIN = 42 V) to 2.75 µs (VIN = 10 V), yielding frequencies from ~800 kHz down to ~100 kHz. Equation 7 in the datasheet provides exact calculation.
Can LM25010SDX/NOPB be used in automotive applications?
Yes, LM25010SDX/NOPB is qualified for automotive applications per AEC-Q100 Grade 1 (–40°C to +125°C ambient) and Grade 0 (–40°C to +150°C ambient). It includes HBM ESD classification Level 2 and CDM Level C5, and features thermal shutdown, input UVLO, and gate drive UVLO - all essential for under-hood and body electronics reliability.
What is the purpose of the SGND and RTN pins on LM25010SDX/NOPB?
LM25010SDX/NOPB separates analog ground paths: SGND serves as the dedicated return for the current-sense amplifier (ISEN), minimizing noise coupling into the valley current limit detection; RTN is the ground return for all other internal circuitry including regulation comparators and bias regulators. Proper PCB layout requires separate copper pours for SGND and RTN, joined at a single point near the device's exposed pad to maintain accuracy and stability.
LM25010SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN 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):
- 2.5V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (4x4)
LM25010SDX/NOPB FAQ
1.How can I place an order for LM25010SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010SDX/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 LM25010SDX/NOPB reliable?
The price and inventory of LM25010SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25010SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010SDX/NOPB?
LM25010SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010SDX/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 LM25010SDX/NOPB?
For technical support, including LM25010SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010SDX/NOPB requirements.
6.How does Aetrix verify that LM25010SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25010SDX/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 LM25010SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25010SDX/NOPB?
All LM25010SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25010SDX/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 LM25010SDX/NOPB part is unused and in its original packaging.
Return procedure for LM25010SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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