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Texas Instruments LM25010SD/NOPB
- Part No.:
- LM25010SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM25010SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:11,399
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Product details
Overview
LM25010SD/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 valley current limiting at 1.25 A, and supports programmable switching frequency up to 1 MHz - used in automotive electronics and secondary-side post-regulation.
For engineers reviewing the LM25010SD/NOPB datasheet, LM25010SD/NOPB pinout, LM25010SD/NOPB application, or LM25010SD/NOPB equivalent, key selection considerations include its no-loop-compensation design, 2.5 V ±2% feedback reference, programmable soft start via SS pin, thermal shutdown at 175°C, and compatibility with WSON-10 package for thermally demanding environments.
Technical Context
The LM25010SD/NOPB implements a constant ON-time regulation scheme where tON varies inversely with VIN, enabling nearly constant operating frequency across line and load variations. Its valley current limit detection (1.25 A typical) operates during the OFF-time by sensing recirculating current through an internal 130 mΩ sense resistor between ISEN and SGND.
Control logic compares FB voltage to a 2.5 V reference; when FB falls below threshold, a one-shot ON timer initiates conduction. The 260 ns fixed OFF-time ensures bootstrap capacitor recharge and enforces minimum off-duration, while overvoltage protection triggers immediate ON-time termination if FB exceeds 2.9 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide industrial and automotive battery-fed systems without external pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures. |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and high-density layout; frequency set via RON resistor and VIN. |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting using standard resistor dividers (e.g., 2.5 V × (R1+R2)/R2). |
| Current Limit Threshold | 1.25 A typical - protects against overload and short-circuit conditions; detectable at ISEN pin with 130 mΩ internal sense path. |
| Soft Start Current | 11.5 µA - charges external SS capacitor linearly to 2.5 V, controlling ramp rate of output voltage during startup. |
| Thermal Shutdown | 175°C with 20°C hysteresis - disables switching until junction cools to ~155°C, preventing permanent damage under sustained overload. |
Pinout & Package
LM25010SD/NOPB is packaged in a thermally enhanced 10-pin WSON (DPR) package measuring 4.00 mm × 4.00 mm with exposed pad for PCB ground connection and improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6–42 V DC; requires local bypass capacitors near RTN to minimize noise and EMI. |
| 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 generate gate drive voltage for high-side N-FET. |
| VCC | Bias regulator output | Provides internal 7 V regulated supply (or tracks VIN below 8.9 V); requires ≥0.47 µF ceramic capacitor to RTN. |
| ISEN | Current sense input | Senses valley inductor current during OFF-time; internal 130 mΩ resistor sets 1.25 A limit threshold. |
| SGND | Current sense ground | Return path for recirculating inductor current; must be routed separately from power ground to avoid noise coupling. |
| RTN | Analog ground reference | Ground return for all internal circuitry except current sense path; connects to system ground plane. |
| FB | Voltage feedback input | Compares output voltage divider ratio to 2.5 V reference; bias current <1 nA ensures minimal divider loading. |
| SS | Soft start control | Internal 11.5 µA current source ramps voltage to 2.5 V; controls output voltage rise time and limits inrush current. |
| RON/SD | ON-time programming / shutdown | Resistor from VIN sets tON; grounding forces shutdown mode with reduced quiescent current (90–170 µA). |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates need for external compensation network - simplifies design and improves transient response. |
| Ultra-fast transient response | Load step recovery within microseconds due to direct FB-to-switch control without error amplifier delay. |
| Integrated high-voltage bias regulator | Self-powered from VIN (6–42 V); regulates VCC to 7 V above 8.9 V, reducing need for external bias supply. |
| Programmable soft start | Adjustable startup ramp via external SS capacitor - prevents output overshoot and inrush into large capacitive loads. |
| Valley current limiting | Detects lowest inductor current point during OFF-time - avoids false triggering from ripple and enables accurate current foldback. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interfaces in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC converter stepping down 12 V or 24 V battery rail to 3.3 V or 5 V. Use Value: AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient), integrated current limit, and thermal shutdown ensure reliability in under-hood environments. | Use Scenario: Supplies isolated field-side logic and analog front-end circuitry in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Secondary-side post-regulator delivering stable 5 V from intermediate 12 V or 24 V bus. Use Value: Wide 6–42 V input range accommodates varying industrial bus voltages; no loop compensation reduces BOM count and layout sensitivity. |
| Telecom Remote Radio Unit | EV Onboard Charger Auxiliary Supply |
Use Scenario: Generates bias voltage for RF power amplifiers and digital baseband in 4G/5G small cell remote radio heads. IC Role / Device Role / Timing Role: High-efficiency buck regulator converting –48 V telecom supply (via intermediate boost stage) to +5 V or +3.3 V. Use Value: 1 MHz max switching frequency enables use of small, low-profile inductors; valley current limit prevents latch-up during antenna VSWR events. | Use Scenario: Provides auxiliary 12 V supply for gate drivers, MCU, and communication ICs inside electric vehicle onboard chargers. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator accepting variable HV battery-derived rails (e.g., 200–450 V via DC-DC pre-regulator). Use Value: 42 V absolute max input rating allows safe operation with 36 V intermediate bus; thermal shutdown protects against cooling-fan failure scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011SD/NOPB | Higher 2-A current capability; same pinout and control architecture; wider RDS(ON) spec (0.35–0.8 Ω vs. 0.35–0.85 Ω). | Supports higher output current loads without redesign; suitable when >1 A peak demand exists. | Select LM25011SD/NOPB if output current exceeds 1 A continuously or during transients. |
| LM5164QDDARQ1 | Wider 3–100 V input range; 1-A rating; integrated MOSFETs; different constant ON-time implementation with adjustable UVLO. | Valid for ultra-wide-input applications (e.g., 12 V–72 V battery systems); not pin-compatible. | Choose LM5164QDDARQ1 only when input voltage exceeds 42 V or AEC-Q100 Grade 0 (–40°C to 150°C) is required. |
Compared with LM25010SD/NOPB, LM25011SD/NOPB offers higher current headroom in identical footprint, while LM5164QDDARQ1 extends input range beyond 42 V but requires full schematic and layout revision due to differing pin functions and control behavior.
Availability
LM25010SD/NOPB is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC power supplies, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM25010SD/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, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM25010SD/NOPB belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for cost-sensitive, thermally constrained buck conversion in automotive and industrial environments where input voltage exceeds 36 V.
FAQ
What is the maximum input voltage rating for LM25010SD/NOPB?
The LM25010SD/NOPB has an absolute maximum input voltage rating of 45 V across VIN to RTN, with recommended operation from 6 V to 42 V. Exceeding 42 V may trigger internal protection circuits or reduce reliability; the device is not rated for sustained operation above this level per TI's Recommended Operating Ratings table.
Does LM25010SD/NOPB require external compensation components?
No, LM25010SD/NOPB does not require external compensation components. Its constant ON-time control architecture eliminates the need for traditional Type II or Type III compensation networks, simplifying design and improving load transient response without stability tuning.
How is the switching frequency programmed on LM25010SD/NOPB?
The switching frequency of LM25010SD/NOPB is programmed using an external resistor (RON) connected between VIN and the RON/SD pin. Frequency increases with decreasing RON value and varies inversely with VIN; typical range spans <100 kHz to 1 MHz depending on RON selection and input voltage.
What package type is used for LM25010SD/NOPB?
LM25010SD/NOPB uses the 10-pin WSON (DPR) package, measuring 4.00 mm × 4.00 mm with an exposed thermal pad. This thermally enhanced package supports high-power density layouts and requires soldering the exposed pad to the PCB ground plane for optimal thermal performance.
Is LM25010SD/NOPB qualified for automotive applications?
Yes, LM25010SD/NOPB is qualified for automotive applications under AEC-Q100 Grade 1 (–40°C to 125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It meets requirements for body electronics, infotainment, and ADAS subsystems where robustness and temperature resilience are critical.
LM25010SD/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)
LM25010SD/NOPB FAQ
1.How can I place an order for LM25010SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010SD/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 LM25010SD/NOPB reliable?
The price and inventory of LM25010SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM25010SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010SD/NOPB?
LM25010SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010SD/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 LM25010SD/NOPB?
For technical support, including LM25010SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010SD/NOPB requirements.
6.How does Aetrix verify that LM25010SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25010SD/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 LM25010SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM25010SD/NOPB?
All LM25010SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25010SD/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 LM25010SD/NOPB part is unused and in its original packaging.
Return procedure for LM25010SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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