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Texas Instruments LM25007SD
- Part No.:
- LM25007SD
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25007SD.pdf
- Description:
- IC REG BUCK ADJ 500MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,199
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Product details
Overview
LM25007SD 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, Vin feed-forward for near-constant frequency operation, and intelligent current-limit protection. It operates across 9V–42V input range and delivers regulated output from 2.5V to >30V in automotive body electronics and industrial distributed rail systems.
For engineers reviewing the LM25007SD datasheet, LM25007SD pinout, LM25007SD application, or LM25007SD equivalent, this page provides verified package mapping (WSON-8), confirmed thermal resistance (θJA = 40°C/W), validated current limit behavior (725mA threshold, FB-dependent off-time), and real-world design meaning of RON/SD and RCL programming pins.
Technical Context
The LM25007SD implements a constant on-time hysteretic control scheme where on-time is inversely proportional to VIN via external RON resistor, enabling stable operation without loop compensation. Its Vin feed-forward ensures operating frequency remains nearly constant across 9V–42V input and light-to-full load conditions.
It integrates a high-side N-channel buck switch with bootstrap gate drive (BST–SW capacitor required), internal 7V series bias regulator (VCC), and dual-protection circuitry: cycle-by-cycle current limiting with FB-voltage-dependent off-time and thermal shutdown at 165°C. The exposed thermal pad on the WSON-8 package enables θJA = 40°C/W performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 42V - supports 12VDC/24VDC industrial rails and 24VAC rectified inputs 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 at full load; validated for WSON-8 package per TI characterization data. |
| Feedback Reference | 2.5V ±2% (−40°C to 125°C) - enables precise output setting using standard resistor dividers; supports >30V outputs. |
| Operating Frequency | Up to 800kHz - adjustable via RON; higher frequencies allow smaller magnetics but require careful layout for EMI control. |
| Current Limit Threshold | 725mA (typ) - cycle-by-cycle protection; off-time scales inversely with FB voltage to reduce foldback during overload. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overloads or poor PCB thermal design; resets automatically after cooldown. |
Pinout & Package
LM25007SD is packaged in thermally enhanced WSON-8 (NGT) with 4mm × 4mm footprint and exposed thermal pad (EP) on underside, requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, bootstrap capacitor (BST–SW), and external freewheeling diode; carries high dv/dt and peak current. |
| 2 BST | Bootstrap Supply | Drives high-side gate via external 0.01µF ceramic capacitor to SW; requires low-ESR placement for reliable startup. |
| 3 RCL | Current Limit Off-Time Programming | Resistor to RTN sets fault recovery time; off-time decreases as FB voltage rises, reducing foldback during partial shorts. |
| 4 RTN | Circuit Ground | Power ground reference for internal regulators and comparators; must be low-impedance path to minimize noise coupling. |
| 5 FB | Feedback Input | Senses output via resistor divider; 2.5V internal reference enables wide output range; requires ≥25mV ripple for stable hysteretic operation. |
| 6 RON/SD | On-Time Set / Shutdown Control | Resistor to VIN sets on-time inversely with input voltage; pulled below 0.7V to enter <150µA shutdown mode. |
| 7 VCC | Bias Regulator Output | Internal 7V supply for gate drive; can be externally boosted above 7V to disable internal regulator and improve light-load efficiency. |
| 8 VIN | Main Input Supply | Accepts 9V–42V unregulated input; requires local 0.1µF ceramic decoupling to RTN for transient immunity. |
| EP | Exposed Thermal Pad | Must be soldered to PCB ground plane; primary thermal path for heat dissipation in WSON-8 package. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | Hysteretic constant on-time architecture eliminates need for external compensation network-reduces BOM count and layout sensitivity. |
| Vin feed-forward frequency stabilization | Maintains ~constant switching frequency across input voltage and load variations-simplifies EMI filter design and improves transient predictability. |
| Intelligent current limit with FB-dependent off-time | Reduces foldback severity during overload by shortening off-time as output voltage recovers-enables faster fault recovery than fixed off-time schemes. |
| External VCC bias option | Connecting auxiliary ≥7V source to VCC disables internal regulator-eliminates 7V dropout loss and improves efficiency at light loads. |
| Thermally enhanced WSON-8 package | 4mm × 4mm footprint with exposed pad achieves θJA = 40°C/W-supports 0.5A continuous operation without heatsink in compact industrial designs. |
Applications
| Automotive Body Electronics | Industrial Distributed Rail Systems |
|---|---|
Use Scenario: Powering door module ECUs, seat controllers, and lighting drivers from 12V/24V battery rails with load dumps up to 42V. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing stable 5V or 3.3V supply; handles input transients without external TVS due to 42V rating. Use Value: Eliminates need for pre-regulator stage; integrated current limit and thermal shutdown ensure robustness in harsh under-hood environments. |
Use Scenario: Converting 24VDC factory bus to 12V/5V for PLC I/O modules, sensor interfaces, and HMI backlights. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator; operates continuously at full load with minimal derating due to WSON thermal performance. Use Value: Enables compact, fanless enclosure designs; 0.74Ω RDS(on) and external VCC bias maintain >85% efficiency at 100mA–500mA loads. |
| 24VAC Systems | HB-LED Constant Current Source |
Use Scenario: Rectified 24VAC (≈34V peak) powering HVAC controls, security panels, or building automation nodes. IC Role / Device Role / Timing Role: Input-tolerant buck controller accepting unregulated rectified AC; regulates clean DC output despite line-frequency ripple. Use Value: Avoids bulky linear regulators or additional buck stages; Vin feed-forward maintains stable frequency despite 100Hz input ripple modulation. |
Use Scenario: Driving high-brightness LED strings in signage or architectural lighting using constant-current configuration. IC Role / Device Role / Timing Role: Buck controller repurposed as current source via sense-resistor feedback; leverages accurate 2.5V reference for tight current regulation. Use Value: Supports >30V LED strings directly; intelligent current limit prevents thermal runaway during dimming or open-circuit faults. |
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 1.5A output current, same 42V input, but requires external compensation and lacks Vin feed-forward. | Used where higher current or adjustable frequency is needed; not drop-in due to different control architecture and pinout. | Select LM25011SD only when >0.5A load or programmable frequency is mandatory; LM25007SD remains preferred for simplicity and compactness. |
| TPS54060DGQ | 60V input rating, 0.5A, current-mode control with internal compensation; 2.5V reference but no FB-dependent current limit off-time. | Preferred in high-input-voltage industrial apps (>42V); lacks intelligent foldback recovery and has higher quiescent current (95µA vs 70µA shutdown). | Choose TPS54060DGQ for 60V max input tolerance; LM25007SD offers superior transient response and thermal efficiency in 9V–42V systems. |
Compared with LM25011SD and TPS54060DGQ, the LM25007SD uniquely combines uncompensated hysteretic control, Vin feed-forward frequency stability, and FB-scaled current limit recovery-making it optimal for space-constrained, thermally demanding 0.5A applications within its 42V input window.
Availability
LM25007SD is available at Aetrix Electronics and suitable for automotive body electronics, industrial distributed rail systems, 24VAC-powered controls, and HB-LED driver designs requiring stable component supply with long-term manufacturability.
Supply support for LM25007SD 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 LM25007SD belongs to TI's high-voltage buck regulator product line, designed specifically for cost-sensitive, thermally constrained industrial and automotive applications requiring robust 9V–42V input operation without external compensation.
FAQ
What is the maximum input voltage rating for the LM25007SD?
The LM25007SD has an absolute maximum input voltage (VIN to RTN) of 45V, with recommended operating range from 9V to 42V. This allows safe operation in automotive load-dump scenarios and rectified 24VAC systems. Exceeding 45V risks permanent damage per TI's Absolute Maximum Ratings table.
Does the LM25007SD require external compensation components?
No, the LM25007SD does not require external compensation components. Its constant on-time hysteretic control architecture eliminates the need for loop compensation networks, simplifying design and improving stability across input and load variations-confirmed in the "No Control Loop Compensation Required" feature list and block diagram.
How is the switching frequency set on the LM25007SD?
The LM25007SD switching frequency is set by an external resistor (RON) between the RON/SD pin and VIN. On-time varies inversely with VIN per the equation Ton = 1.42×10⁻¹⁰ × RON / VIN, enabling frequency adjustment up to 800kHz. Frequency remains stable across line and load due to Vin feed-forward.
What is the purpose of the RCL pin on the LM25007SD?
The RCL pin on the LM25007SD programs the current-limit off-time duration. A resistor from RCL to RTN sets a base off-time that decreases as FB voltage rises-ensuring faster recovery from partial overloads while maintaining longer off-times during hard shorts. At FB = 0V, off-time is preset to 17µs.
Can the LM25007SD operate without the internal VCC regulator?
Yes, the LM25007SD can operate with its internal VCC regulator disabled by applying an external ≥7V supply to the VCC pin. This bypasses the internal 7V series regulator, eliminating its dropout loss and improving light-load efficiency-explicitly supported in the "High Voltage Bias Regulator (VCC)" section of the datasheet.
LM25007SD 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)
LM25007SD FAQ
1.How can I place an order for LM25007SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25007SD 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 LM25007SD reliable?
The price and inventory of LM25007SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25007SD is usually 5 days.
3.What payment methods are accepted for LM25007SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25007SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25007SD?
LM25007SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25007SD 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 LM25007SD?
For technical support, including LM25007SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25007SD requirements.
6.How does Aetrix verify that LM25007SD is sourced from the original manufacturer or authorized distributors?
All LM25007SD 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 LM25007SD meets industry standards.
7.What is the process for return or replacement of LM25007SD?
All LM25007SD units undergo pre-shipment inspection (PSI). If there is an issue with LM25007SD, 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 LM25007SD part is unused and in its original packaging.
Return procedure for LM25007SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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