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Texas Instruments LM25010SD
- Part No.:
- LM25010SD
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM25010SD.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
LM25010SD from Texas Instruments is a 42-V, 1-A step-down switching regulator with integrated N-channel buck switch, constant ON-time control architecture, 2.5 V ±2% feedback reference, valley current limit of 1.25 A, and programmable switching frequency up to 1 MHz. It operates in automotive-grade environments and delivers regulated DC power in non-isolated telecom and secondary-side post-regulation systems.
For engineers reviewing the LM25010SD datasheet, LM25010SD pinout, LM25010SD application, or LM25010SD equivalent, key selection considerations include its 6–42 V input range, no-loop-compensation design, thermal shutdown at 175°C, soft-start programmability via external capacitor, and compatibility with WSON-10 package layout constraints.
Technical Context
The LM25010SD uses a constant ON-time regulation scheme where tON varies inversely with VIN to maintain nearly constant operating frequency across line and load variations. Its valley current limiting detects recirculating current through an internal 130 mΩ sense resistor at ISEN/SGND, triggering shutdown when current exceeds 1.25 A.
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 gate drive UVLO at 1.7–4 V (BST–SW). The 260 ns fixed OFF-time ensures bootstrap capacitor recharge and enables stable operation up to 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide industrial and automotive battery-fed inputs without pre-regulation |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting via resistive divider (VOUT = 2.5 × (R1+R2)/R2) |
| Current Limit Threshold | 1.25 A (typical) - protects against overload by disabling switch until inductor current falls below threshold |
| Switching Frequency | Up to 1 MHz - allows compact magnetics and fast transient response; set via RON resistor and VIN |
| Soft-Start Current | 11.5 µA - charges external SS capacitor linearly to 2.5 V, controlling ramp rate of output voltage |
| Thermal Shutdown | 175°C (typical), 20°C hysteresis - disables switching to prevent damage during sustained overtemperature |
Pinout & Package
LM25010SD is packaged in a thermally enhanced 10-pin WSON (DPR) with 4.00 mm × 4.00 mm body size and exposed thermal pad. The package supports high-power density layouts and requires PCB ground connection to the exposed pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input (6–42 V); bypassed directly to RTN with low-ESR capacitor |
| SW | Switch Node | Drain of internal N-channel MOSFET; connects to inductor, freewheeling diode, and BST capacitor |
| BST | Bootstrap Supply | Supplies gate drive for high-side switch; requires ceramic capacitor (0.022 µF) between BST and SW |
| ISEN | Current Sense Input | Monitors valley inductor current during OFF-time; triggers current limit when >1.25 A flows out of this pin |
| SGND | Sense Ground | Return path for current-sense resistor; must be routed separately from power ground to avoid noise coupling |
| RTN | Regulator Ground | Ground return for all internal circuitry except current sense; ties to system ground plane |
| FB | Feedback Input | Compares output voltage (via resistor divider) to 2.5 V reference; sets regulation point and overvoltage trip (2.9 V) |
| RON/SD | ON-Time Control / Shutdown | Resistor from VIN sets tON; grounding forces shutdown and discharges SS capacitor |
| SS | Soft-Start | Internal 11.5 µA current source charges external capacitor to 2.5 V, ramping reference for controlled startup |
| VCC | Bias Regulator Output | Internally generated supply (7 V regulated or VIN-tracked); powers gate driver and logic; requires ≥0.47 µF bypass |
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 upon FB dip below 2.5 V |
| Programmable soft start | Adjustable startup time via external SS capacitor; prevents inrush current and output overshoot |
| Integrated high-voltage bias regulator | Eliminates need for external LDO; auto-switches between VIN tracking (<8.9 V) and 7 V regulation (>8.9 V) |
| Valley current limiting | Detects minimum inductor current during OFF-time, enabling accurate cycle-by-cycle current protection |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V to MCU, CAN transceiver, and sensor interfaces in under-hood ECUs with 12 V or 24 V battery input. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable, low-noise DC power with thermal robustness to 125°C ambient. Use Value: AEC-Q100 Grade 1 qualification, 175°C thermal shutdown, and 42 V input tolerance ensure reliable operation during cold-crank and load-dump events. | Use Scenario: Powers digital I/O circuits and fieldbus interface ICs in programmable logic controllers operating from 24 V DC industrial rails. IC Role / Device Role / Timing Role: Secondary-side post-regulator converting 24 V to 5 V/3.3 V with minimal external components and no compensation. Use Value: Valley current limit and fast transient response maintain regulation during sudden load changes from solenoid actuation or relay switching. |
| Telecom Remote Radio Unit | Medical Point-of-Care Instrument |
Use Scenario: Generates intermediate rail (e.g., 5 V) from 48 V backplane in remote radio head units requiring high efficiency and EMI control. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating at 600 kHz to minimize filter size while meeting EN55022 Class B emissions. Use Value: Programmable frequency and constant-frequency behavior simplify EMI filtering; 1.25 A current limit protects against short-circuit faults on dense RF boards. | Use Scenario: Provides isolated auxiliary power for analog front-end and display subsystems in portable diagnostic devices powered from 12 V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down regulator in space-constrained enclosures with limited airflow. Use Value: WSON-10 package with exposed pad enables direct thermal coupling to metal chassis; soft-start prevents voltage sag during battery-powered boot-up. |
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 | Higher 2-A output current rating; same 6–42 V input, 2.5 V reference, and WSON-10 package | Supports higher load currents without external current boosting; requires larger inductor and output capacitor | Select LM25011SD when peak load exceeds 1 A but board area and pinout compatibility are critical |
| TPS54160DGQ | 60-V input, 1.5-A output, current-mode control; requires external compensation; SOIC-10 package | Broader input range and higher current, but slower transient response and more complex loop design | Choose TPS54160DGQ for 60 V input systems or when current-mode stability analysis is preferred over constant ON-time simplicity |
Compared with LM25010SD, LM25011SD offers higher current capacity in identical footprint, while TPS54160DGQ trades simplified design for extended input voltage and different control methodology-making LM25010SD optimal for cost-sensitive, thermally constrained 1-A applications needing fast, uncompensated regulation.
Availability
LM25010SD 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 sourcing.
Supply support for LM25010SD 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, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive ICs.
The LM25010SD belongs to TI's high-voltage DC-DC regulator product line, designed specifically for efficient, compact, and robust non-isolated buck conversion in harsh environments such as automotive and industrial power systems.
FAQ
What is the maximum input voltage supported by the LM25010SD?
The LM25010SD supports a maximum input voltage of 42 V, with absolute maximum rating of 45 V on the VIN pin. Operation beyond 42 V violates recommended operating conditions and risks premature failure. The device includes internal protection features like VCC undervoltage lockout and thermal shutdown, but sustained input above 42 V is not guaranteed safe. Always refer to the LM25010SD datasheet Section 6.1 for absolute maximum ratings and derating guidance.
Does the LM25010SD require external compensation components?
No, the LM25010SD does not require external compensation components. Its constant ON-time control architecture eliminates the need for loop compensation networks, simplifying design and improving load transient response. This feature is explicitly confirmed in the LM25010SD datasheet Sections 1 (Features), 3 (Description), and 7.3.1 (Control Circuit Overview), where it states "no loop compensation required" and attributes ultra-fast transient response to this architecture.
How is the switching frequency set on the LM25010SD?
The switching frequency of the LM25010SD is set by an external resistor (RON) connected between VIN and the RON/SD pin, and varies with input voltage. For continuous conduction mode, FS ≈ (VOUT × (VIN − 1.4 V)) / (1.18 × 10⁻¹⁰ × (RON + 1.4 kΩ) × VIN). Typical values range from <100 kHz to 1 MHz. The LM25010SD datasheet Figure 5 and Equation 7 provide full derivation and design examples for selecting RON based on target frequency and VIN/VOUT.
What package type is used for the LM25010SD?
The LM25010SD uses a 10-pin WSON (Wettable Flank Small Outline No-Lead) package, also designated DPR, with nominal dimensions of 4.00 mm × 4.00 mm and an exposed thermal pad. This package is distinct from the HTSSOP variant (PWP) and is specified in the LM25010SD datasheet Section 12 and Device Information table. Thermal performance relies on proper soldering of the exposed pad to the PCB ground plane.
Can the LM25010SD be used in automotive applications?
Yes, the LM25010SD 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, and includes thermal shutdown at 175°C with 20°C hysteresis. These qualifications are documented in the LM25010SD datasheet Sections 1 (Features), 6.3 (ESD Ratings), and 6.4 (Recommended Operating Ratings).
LM25010SD 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)
LM25010SD FAQ
1.How can I place an order for LM25010SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010SD 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 reliable?
The price and inventory of LM25010SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010SD is usually 5 days.
3.What payment methods are accepted for LM25010SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010SD?
LM25010SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010SD 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?
For technical support, including LM25010SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010SD requirements.
6.How does Aetrix verify that LM25010SD is sourced from the original manufacturer or authorized distributors?
All LM25010SD 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 meets industry standards.
7.What is the process for return or replacement of LM25010SD?
All LM25010SD units undergo pre-shipment inspection (PSI). If there is an issue with LM25010SD, 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 part is unused and in its original packaging.
Return procedure for LM25010SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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