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Texas Instruments LM25010SDX
- Part No.:
- LM25010SDX
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM25010SDX.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,313
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Product details
Overview
LM25010SDX from Texas Instruments is a 42-V, 1-A step-down switching regulator IC 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 post-regulators and telecom DC-DC conversion.
For engineers reviewing the LM25010SDX datasheet, LM25010SDX pinout, LM25010SDX application, or LM25010SDX equivalent, key selection considerations include its wide input range, no-loop-compensation design, thermal shutdown (175°C), 2.5 V ±2% feedback reference, and soft-start programmability via external capacitor.
Technical Context
The LM25010SDX 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 uses internal 130 mΩ sense resistor and triggers at 1.25 A (typ), with response time of 150 ns.
It integrates a high-voltage bias regulator that tracks VIN below 8.9 V and regulates VCC at 7 V above that threshold, with UVLO at 5.25 V and hysteresis of 180 mV. The gate driver employs bootstrap operation (BST–SW) and includes gate drive UVLO (1.7–4 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports direct connection to automotive battery rails and industrial 24/36-V systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and low-profile filter design; frequency set by RON resistor and VIN. |
| Feedback Reference | 2.5 V ±2% - sets output voltage via external resistor divider (VOUT = 2.5 × (R1 + R2)/R2). |
| Current Limit Threshold | 1.25 A (typ), 1.0–1.5 A (min–max) - protects against overload and short-circuit with valley-sensing during OFF-time. |
| Soft Start Current | 11.5 µA (typ) - charges external SS capacitor linearly to 2.5 V, controlling ramp rate of output voltage. |
| Thermal Shutdown | 175°C (typ), 20°C hysteresis - disables switching until junction cools to ~155°C, preventing thermal runaway. |
Pinout & Package
LM25010SDX is packaged in a thermally enhanced 10-pin WSON (4.0 mm × 4.0 mm) with exposed pad for PCB ground connection. Pin functions are validated per TI SNVS419E Rev E datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Primary power input (6–42 V); requires local bypass capacitor to RTN. |
| SW | Switching node | Drain of internal N-MOSFET; connects to inductor, freewheeling diode, and BST capacitor. |
| BST | Bootstrap supply | Charged from VCC through internal diode during SW OFF-time; powers high-side gate driver. |
| ISEN | Current sense input | Monitors recirculating inductor current during OFF-time; triggers valley current limit at 1.25 A. |
| SGND | Sense ground | Return path for ISEN current; must be routed separately from power ground to avoid noise coupling. |
| RTN | Regulator ground | Ground return for internal bias circuitry; separate from SGND to isolate sensing path. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5 V reference; controls ON-time initiation. |
| SS | Soft start | Internal 11.5 µA current source charges external capacitor; ramps reference to prevent inrush. |
| RON/SD | ON-time control / shutdown | Resistor sets tON; grounding forces shutdown and discharges SS pin. |
| VCC | Bias regulator output | Internally regulated at 7 V (for VIN > 8.9 V) or tracks VIN (for VIN < 8.9 V); powers internal circuitry. |
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. |
| Integrated high-voltage bias regulator | Eliminates need for external LDO; self-biases from VIN and supports auxiliary VCC injection (7.5–14 V) to reduce dissipation. |
| Programmable soft start | Adjustable ramp time via external SS capacitor; prevents output overshoot and limits inrush into bulk capacitance. |
| Valley current limiting | Detects minimum inductor current during OFF-time - avoids false triggering during light-load DCM and ensures accurate overcurrent protection. |
Applications
| Automotive Body Control Module | Industrial 24-V Rail Post-Regulator |
|---|---|
Use Scenario: Powering MCU, CAN transceiver, and sensor interfaces in door modules or lighting controllers from 12-V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V or 5 V output; handles input dips to 6 V and surges to 42 V per ISO 7637-2. Use Value: AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient), thermal shutdown, and valley current limit ensure robustness in under-hood environments. | Use Scenario: Generating 5 V or 12 V from factory 24-V DC bus to power PLC I/O modules, HMI displays, and fieldbus gateways. IC Role / Device Role / Timing Role: Non-isolated step-down converter with minimal external components; replaces discrete buck controller + MOSFET solutions. Use Value: Wide 6–42 V input range accommodates brownouts and transients; 1 A output supports multiple downstream LDOs or point-of-load regulators. |
| Telecom Remote Radio Unit | Commercial Vehicle Telematics Hub |
Use Scenario: Supplying 3.3 V to FPGAs and RF front-end ICs in outdoor base station radios powered from 48-V phantom supply. IC Role / Device Role / Timing Role: Secondary-side buck regulator after isolation stage; operates at up to 1 MHz to minimize EMI and filter size. Use Value: Programmable frequency allows EMI tuning; no loop compensation simplifies design validation across temperature and aging. | Use Scenario: Powering GPS, cellular modem, and GNSS receivers in fleet management units mounted in cab or chassis. IC Role / Device Role / Timing Role: Main DC-DC converter converting vehicle battery (9–32 V nominal) to stable 5 V for communication subsystems. Use Value: 1.25 A current limit and thermal shutdown protect against sustained overload during antenna jamming or modem fault conditions. |
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 | Higher 2-A output current rating; same package and pinout; shares identical control architecture and feature set. | Used where peak load exceeds 1 A or higher current margin is required for reliability. | Select LM25011SDX if design requires >1 A continuous output or anticipates future load growth. |
| TPS54160DGQ | Wider 3.5–60 V input range; lower 1.5-A current limit; uses current-mode control requiring external compensation. | Preferred in ultra-wide-input applications (e.g., solar charge controllers) where 60-V max is needed. | Choose TPS54160DGQ only if input exceeds 42 V; otherwise LM25010SDX offers simpler design and faster transient response. |
Compared with LM25011SDX, the LM25010SDX provides tighter thermal performance in 10-pin WSON due to lower conduction loss at 1-A loads; versus TPS54160DGQ, it eliminates compensation design effort and achieves superior load-step recovery without sacrificing input range adequacy for automotive and industrial 24/36-V systems.
Availability
LM25010SDX is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24-V power distribution, and telecom remote radio unit designs requiring stable component supply and long-term manufacturability.
Supply support for LM25010SDX 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 across automotive, industrial, personal electronics, and communications markets.
The LM25010 product line targets high-voltage DC-DC conversion in space-constrained, thermally demanding environments - specifically engineered for automotive post-regulation and industrial telecom power supplies where simplicity, reliability, and input ruggedness are critical.
FAQ
What is the maximum input voltage rating for LM25010SDX?
The absolute maximum input voltage (VIN to RTN) for LM25010SDX is 45 V, with recommended operating range specified as 6 V to 42 V. Operation beyond 42 V risks exceeding safe SOA limits and may trigger overvoltage protection on internal circuits like the VCC regulator or gate driver. TI's datasheet specifies 42 V as the upper limit for reliable continuous operation across temperature and lifetime.
Does LM25010SDX require external compensation components?
No, LM25010SDX does not require external compensation components. Its constant ON-time control architecture eliminates the need for loop compensation networks - unlike voltage-mode or current-mode controllers. Stability is inherent, and transient response is optimized by design, reducing bill-of-materials cost and layout complexity while improving immunity to component aging and temperature drift.
How is the switching frequency set on LM25010SDX?
The switching frequency of LM25010SDX is set by an external resistor (RON) connected between VIN and the RON/SD pin, and varies inversely with input voltage. For example, with RON = 200 kΩ and VIN = 24 V, typical frequency is ~400 kHz. Equation 7 in the TI SNVS419E datasheet provides exact calculation: FS ≈ VOUT × (VIN − 1.4 V) / [1.18×10⁻¹⁰ × (RON + 1.4 kΩ) × VIN].
What is the purpose of the SGND and RTN pins on LM25010SDX?
LM25010SDX separates signal ground (SGND) and regulator ground (RTN) to isolate the high-noise current-sense path from internal bias circuitry. SGND carries recirculating inductor current during OFF-time for valley current limit detection, while RTN serves as the reference for VCC regulation, FB comparator, and logic blocks. Proper PCB routing - keeping SGND traces short and avoiding shared copper with RTN - is essential to maintain accuracy and noise immunity.
Can LM25010SDX be used in automotive applications?
Yes, LM25010SDX is qualified for automotive applications under AEC-Q100 Grade 1 (–40°C to 125°C ambient) and Grade 0 (–40°C to 150°C ambient). It meets HBM ±2000 V and CDM ±750 V ESD requirements, includes thermal shutdown at 175°C, and supports input transients up to 42 V - making it suitable for body control modules, telematics, and infotainment power supplies in passenger and commercial vehicles.
LM25010SDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM25010SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010SDX 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 reliable?
The price and inventory of LM25010SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010SDX is usually 5 days.
3.What payment methods are accepted for LM25010SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010SDX?
LM25010SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010SDX 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?
For technical support, including LM25010SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010SDX requirements.
6.How does Aetrix verify that LM25010SDX is sourced from the original manufacturer or authorized distributors?
All LM25010SDX 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 meets industry standards.
7.What is the process for return or replacement of LM25010SDX?
All LM25010SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM25010SDX, 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 part is unused and in its original packaging.
Return procedure for LM25010SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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