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Texas Instruments LM25007SDX
- Part No.:
- LM25007SDX
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25007SDX.pdf
- Description:
- IC REG BUCK ADJ 500MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
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Product details
Overview
LM25007SDX from Texas Instruments is a monolithic 42V, 0.5A step-down switching regulator with integrated 0.74Ω N-channel MOSFET, constant on-time control architecture, and Vin feed-forward for near-constant frequency operation across input and load variations. It delivers regulated output voltages from 2.5V to >30V and is used in 24VDC industrial power rails and automotive body electronics.
For engineers reviewing the LM25007SDX datasheet, LM25007SDX pinout, LM25007SDX application, or LM25007SDX equivalent, key selection considerations include its WSON-8 thermal performance (θJA = 40°C/W), intelligent current limit with Vout-proportional off-time, no external loop compensation requirement, and shutdown control via RON/SD pin voltage threshold.
Technical Context
The LM25007SDX implements a hysteretic constant on-time buck controller with Vin feed-forward, where on-time is inversely proportional to VIN and set by an external resistor on RON/SD. Its regulation relies on a 2.5V internal reference compared against FB voltage, with cycle-by-cycle current limiting and programmable off-time via RCL.
It integrates a high-side N-channel MOSFET switch, bootstrap gate drive (BST–SW capacitor required), and a self-biasing 7V series regulator on VCC that shuts down when externally biased above 7V. Thermal shutdown activates at 165°C with 25°C hysteresis, and the exposed thermal pad must be soldered to PCB ground for thermal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 42V - supports wide-input industrial and automotive rails without pre-regulation |
| Output Current | Guaranteed 0.5A - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems |
| Switch RDS(on) | 0.74Ω (typ) - reduces conduction loss and enables high efficiency at mid-load conditions |
| Feedback Reference | 2.5V ±2% (−40°C to 125°C) - enables precise output setting with standard resistor dividers |
| Operating Frequency | Up to 800kHz - adjustable via RON resistor; enables compact magnetics and low output ripple |
| Current Limit Threshold | 725mA (typ) - provides cycle-by-cycle protection while supporting peak transient loads |
| Thermal Resistance θJA | 40°C/W (WSON-8 package) - enables higher power dissipation than VSSOP-8 (200°C/W) without heatsink |
Pinout & Package
LM25007SDX is packaged in thermally enhanced WSON-8 (NGT) with 4mm × 4mm footprint and exposed thermal pad (EP) on underside, requiring connection to PCB ground plane for optimal thermal performance and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching Node | Connects to inductor, bootstrap capacitor, and freewheeling diode; carries high dv/dt switching waveform |
| BST | Bootstrap Supply | Requires 0.01µF ceramic capacitor to SW; supplies gate drive voltage for internal N-MOSFET |
| RCL | Current Limit Off-Time Programming | Resistor to RTN sets fault recovery time; off-time decreases as FB voltage rises (e.g., 17µs at FB=0V) |
| RTN | Circuit Ground Reference | Analog and power ground return; must be low-impedance path to minimize noise coupling into FB |
| FB | Feedback Input | Compares output voltage (via resistor divider) to 2.5V reference; determines regulation accuracy and stability |
| RON/SD | On-Time Set / Shutdown Control | Resistor to VIN sets on-time; pulled below 0.7V to enter low-quiescent-current shutdown mode |
| VCC | Internal Bias Regulator Output | 7V series regulator output; can be externally biased ≥7V to disable internal regulator and reduce power loss |
| VIN | Main Input Supply | Accepts 9–42V DC; requires local 0.1µF ceramic decoupling to RTN for EMI suppression and stability |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Constant on-time architecture eliminates need for type-II/type-III compensator design and component selection |
| Intelligent current limit with Vout-proportional off-time | Reduces foldback during overload (vs. fixed off-time), enabling faster recovery and improved system resilience |
| Vin feed-forward for stable operating frequency | Maintains ~constant switching frequency across 9–42V input range and varying load, simplifying EMI filtering |
| External VCC bias capability | Allows connection of auxiliary ≥7V supply to bypass internal 7V regulator, improving light-load efficiency |
| Thermally enhanced WSON-8 package | 40°C/W junction-to-ambient thermal resistance enables 0.5A operation at elevated ambient temperatures |
Applications
| Industrial 24VDC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Distributed 24V power conversion in factory automation PLCs and I/O modules where input voltage varies between 18–32V due to line drop or battery float. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 5V or 3.3V for MCU, CAN transceivers, and analog front-ends. Use Value: Ultra-fast transient response maintains output regulation during motor startup surges; no compensation simplifies layout validation. |
Use Scenario: Powering door module ECUs, seat controllers, and lighting drivers in 12V/24V vehicle architectures with cold-crank (6.5V) and load-dump (40V+) transients. IC Role / Device Role / Timing Role: Input-tolerant buck converter supplying 5V to microcontroller and LIN transceivers. Use Value: 42V absolute max input rating and thermal shutdown protect against load-dump events; WSON package withstands under-hood temperature cycling. |
| HB-LED Constant Current Driver | 24VAC-to-DC Conversion for Smart Building Systems |
Use Scenario: Driving high-brightness LED strings in signage or architectural lighting using constant-current configuration with external sense resistor. IC Role / Device Role / Timing Role: Buck controller configured in constant-current mode via feedback network; regulates LED current rather than voltage. Use Value: 2.5V reference and accurate current limit enable ±3% LED current regulation; 800kHz operation allows small inductors for space-constrained fixtures. |
Use Scenario: Converting rectified 24VAC (≈34V peak) to regulated 5V/12V for HVAC controllers, occupancy sensors, and DALI gateways in commercial buildings. IC Role / Device Role / Timing Role: High-input-voltage buck regulator accepting unregulated rectified AC-derived DC bus. Use Value: 42V input rating accommodates full-wave rectified 24VAC peaks with margin; no-loop-compensation reduces BOM count in cost-sensitive building controls. |
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 1.5A output current, 65V max input, same WSON-8 package and pinout | Supports higher-power loads (e.g., multi-rail systems); requires larger inductor and output capacitor | Select LM25011SDX when >0.5A continuous output or >42V input margin is required; otherwise LM25007SDX offers lower cost and smaller solution size. |
| TPS54060DGQR | 60V input, 0.6A, current-mode control, requires external compensation, SOIC-8 package | Needs loop compensation design and larger footprint; offers adjustable soft-start and sync capability | Choose TPS54060DGQR only if synchronization to external clock or programmable soft-start is mandatory; LM25007SDX provides simpler, more compact implementation for fixed-frequency non-synchronous use. |
Compared with LM25011SDX and TPS54060DGQR, the LM25007SDX delivers optimal balance of integration (no compensation), thermal performance (WSON-8), and cost for 0.5A industrial and automotive point-of-load applications - especially where fast transient response and input voltage flexibility outweigh need for higher current or synchronization.
Availability
LM25007SDX is available at Aetrix Electronics and suitable for industrial control systems, automotive telematics modules, and smart building power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant WSON packaging.
Supply support for LM25007SDX 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM25007SDX belongs to TI's high-voltage buck regulator product line, designed specifically for robust, low-component-count DC-DC conversion in harsh environments such as automotive, industrial, and building automation systems.
FAQ
What is the maximum input voltage rating for the LM25007SDX?
The LM25007SDX has an absolute maximum input voltage (VIN to RTN) of 45V, with recommended operating range from 9V to 42V. This 42V upper limit ensures safe operation under automotive load-dump conditions and industrial 24V rail transients. Exceeding 45V risks permanent damage to the internal N-MOSFET and gate driver circuitry. Always include input overvoltage clamping if system-level transients may exceed this rating.
Does the LM25007SDX require external compensation components?
No, the LM25007SDX does not require external compensation components. Its constant on-time control architecture with Vin feed-forward eliminates the need for traditional type-II or type-III compensation networks. Stability is inherently achieved across input and load variations, reducing design complexity and BOM count. This makes the LM25007SDX particularly suitable for rapid prototyping and cost-sensitive applications where layout area and component count are constrained.
How is the switching frequency set on the LM25007SDX?
The LM25007SDX switching frequency is set indirectly via the RON resistor connected between RON/SD and VIN. On-time is calculated as TON = 1.42 × 10−10 × RON / VIN, resulting in an approximate frequency range up to 800kHz depending on VIN and VOUT. Unlike voltage-mode controllers, no external frequency-setting resistor or capacitor is needed - only the single RON resistor determines timing behavior, simplifying design and improving consistency across input voltage changes.
What is the purpose of the RCL pin on the LM25007SDX?
The RCL pin on the LM25007SDX programs the current-limit off-time duration after overcurrent detection. A resistor between RCL and RTN sets a fault recovery interval that scales inversely with FB voltage - e.g., 17µs at FB = 0V (short circuit) and shorter times at higher FB (partial overload). This intelligent off-time prevents excessive foldback and enables faster restart under partial faults, improving system robustness in applications like motor drives or LED strings where temporary overloads occur.
Can the LM25007SDX operate with an output voltage below 2.5V?
No, the LM25007SDX cannot regulate output voltages below 2.5V because its internal feedback reference is fixed at 2.5V ±2%. The output voltage is set by the equation VOUT = 2.5 × (R3 + R4) / R4, meaning the lowest achievable regulated output is 2.5V (when R3 = 0). Attempting to configure for lower outputs results in loss of regulation and potential instability. For sub-2.5V outputs, a different regulator with adjustable or lower reference voltage - such as the LM25017 or TPS5430 - must be selected.
LM25007SDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-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):
- 9V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- Up to 800kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM25007SDX FAQ
1.How can I place an order for LM25007SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25007SDX 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 LM25007SDX reliable?
The price and inventory of LM25007SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25007SDX is usually 5 days.
3.What payment methods are accepted for LM25007SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25007SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25007SDX?
LM25007SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25007SDX 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 LM25007SDX?
For technical support, including LM25007SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25007SDX requirements.
6.How does Aetrix verify that LM25007SDX is sourced from the original manufacturer or authorized distributors?
All LM25007SDX 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 LM25007SDX meets industry standards.
7.What is the process for return or replacement of LM25007SDX?
All LM25007SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM25007SDX, 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 LM25007SDX part is unused and in its original packaging.
Return procedure for LM25007SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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