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Texas Instruments LM5010SDX
- Part No.:
- LM5010SDX
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM5010SDX.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
LM5010SDX from Texas Instruments is a high-voltage 1-A synchronous step-down switching regulator IC featuring an integrated 75-V N-channel buck switch, valley current limit at 1.25 A, constant ON-time control architecture, and operation across 8 V to 75 V input range. It delivers regulated DC output for telecom POL, automotive post-regulation, and industrial high-voltage bias supplies.
For engineers reviewing the LM5010SDX datasheet, LM5010SDX pinout, LM5010SDX application, or LM5010SDX equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and switching specifications, and real-world implementation constraints - all tied explicitly to the LM5010SDX WSON-10 package variant.
Technical Context
The LM5010SDX implements a constant ON-time hysteretic control scheme where tON varies inversely with VIN (e.g., 2.75 µs at 10 V, 390 ns at 75 V), enabling stable switching frequency from 100 kHz to >1 MHz without loop compensation. Its regulation relies on a precision 2.5-V feedback reference and valley current sensing via ISEN/SGND terminals.
Startup uses an internal 7-V regulator (VCC) with 5.8-V UVLO and 140-Ω output impedance; bootstrap gate drive (BST–SW) requires a 0.022-µF ceramic capacitor. Thermal shutdown activates at 175°C (20°C hysteresis), and the exposed thermal pad supports junction-to-board RθJB of 13.2°C/W in WSON-10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 75 V - supports direct connection to 48-V telecom and 42-V automotive buses without pre-regulation. |
| Output Current Capability | 1 A continuous - limited by valley current sense threshold of 1.25 A and thermal design with exposed pad. |
| Feedback Reference | 2.5 V ±2% - sets output voltage via external resistor divider (VOUT = 2.5 × (R1 + R2)/R2). |
| Switching Frequency Range | 100 kHz to >1 MHz - maintained constant across line/load via inverse VIN–tON relationship; minimum OFF-time fixed at 265 ns. |
| Integrated Buck Switch RDS(ON) | 0.35 Ω (typ) - reduces conduction loss; peak current rating capped at 3.5 A, average at 3 A. |
| Thermal Shutdown Threshold | 175°C (typ), 20°C hysteresis - disables switch and grounds SS pin; resumes at ~155°C. |
| VCC Startup Regulator | 7 V ±6%, 10 mA current limit - powers internal circuitry; externally biased option (7.5–14 V) reduces dissipation at high VIN. |
Pinout & Package
LM5010SDX is packaged in a thermally enhanced 10-pin WSON (DPR) with 4.00 mm × 4.00 mm body and exposed thermal pad (EP) for PCB heat sinking. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switching node | Internal N-channel FET source; connects to inductor, freewheeling diode, and BST capacitor - carries high di/dt and must be minimized in loop area. |
| 2 (BST) | Bootstrap supply | Charged from VCC during SW low phase via internal diode; supplies floating gate drive for high-side switch - requires 0.022-µF ceramic capacitor to SW. |
| 3 (ISEN) | Valley current sense output | Current flows out during OFF-time through external freewheeling diode; 1.25-A threshold set internally - external RCL can raise limit. |
| 4 (SGND) | Sense ground return | Return path for recirculating inductor current to internal sense resistor - must be routed separately from power ground to avoid noise coupling into ISEN. |
| 5 (RTN) | Circuit ground reference | Ground for internal logic, comparators, and soft-start - tied to system ground but kept distinct from SGND in layout. |
| 6 (FB) | Feedback input | Compares output voltage (via resistor divider) to 2.5-V reference; <5 nA bias current enables high-impedance dividers; requires ≥25-mV ripple for regulation. |
| 7 (SS) | Soft-start control | Internally charged by 11.5-µA current source to 2.5 V; ramp controls output rise time - grounded during UVLO, thermal shutdown, or RON/SD assertion. |
| 8 (RON/SD) | ON-time programming / shutdown | Resistor from VIN sets tON; pulled below 0.65 V to disable regulator - no external pull-up required due to internal bias. |
| 9 (VCC) | Startup regulator output | 7-V regulated supply for internal circuitry; can accept external 7.5–14 V bias to bypass internal regulator and reduce power loss at high VIN. |
| 10 (VIN) | Main input supply | Accepts 8–75 V directly; internal diode connects VIN to VCC - enables self-biasing but imposes dropout constraint at low VIN. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic constant ON-time control eliminates external compensation components - simplifies BOM and improves transient response. |
| Ultra-fast load transient response | Minimum OFF-time of 265 ns allows immediate reactivation after load step - maintains regulation during rapid current changes. |
| Adjustable output voltage | Set precisely via two-resistor divider referenced to 2.5-V internal reference - supports wide output range with minimal parts. |
| Exposed thermal pad | Enables junction-to-board thermal resistance of 13.2°C/W - critical for sustaining 1-A load at elevated ambient temperatures. |
| Integrated start-up regulator | Self-powered from VIN up to 75 V - eliminates need for auxiliary bias supply while supporting hot-swap and wide-input applications. |
Applications
| Telecom Point-of-Load Regulation | Automotive High-Voltage Post-Regulation |
|---|---|
|
Use Scenario: Converting 48-V intermediate bus to 3.3 V/5 V for FPGA, ASIC, or DSP core logic in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck controller delivering 1-A regulated output with fast transient recovery for burst-mode data processing loads. Use Value: Eliminates need for external gate driver or compensation network; 75-V input rating avoids pre-regulation stage in 48-V systems. |
Use Scenario: Generating stable 5-V rail from 42-V battery system for ADAS camera modules or infotainment ECUs in next-gen vehicles. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating in continuous conduction mode under full load, with thermal shutdown protecting against engine bay temperature excursions. Use Value: Integrated 75-V switch and 175°C thermal cutoff meet AEC-Q100 stress requirements; WSON-10 package supports compact, high-power-density layouts. |
| Industrial Sensor Bias Supply | Industrial PLC Field Power |
|
Use Scenario: Providing isolated 12-V bias for analog front-end sensors in factory automation systems powered from 24-V or 48-V DC distribution rails. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter supplying clean, low-noise 12-V output with adjustable soft-start to prevent inrush into capacitive sensor loads. Use Value: Precision 2.5-V reference and <5 nA FB bias enable accurate output setting; SS pin allows controlled ramp-up to avoid sensor initialization faults. |
Use Scenario: Delivering 24-V field power from 72-V DC link in programmable logic controller backplanes used in harsh industrial environments. IC Role / Device Role / Timing Role: Robust high-input-voltage regulator with valley current limiting and thermal protection - operates reliably across –40°C to +125°C junction range. Use Value: 1.25-A valley current limit prevents transformer saturation in downstream isolated converters; exposed pad ensures long-term reliability under sustained load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5115MTX/NOPB | Requires external MOSFETs; supports up to 75 V input but lacks integrated switch and startup regulator. | Used where higher current (>3 A) or custom FET selection is needed; adds complexity and board space. | Select when scalability beyond 1 A or discrete FET optimization is required - not drop-in compatible with LM5010SDX. |
| TPS54160DGQR | Lower max input (60 V); integrated switch rated for 1.5 A; uses current-mode control requiring compensation. | Better suited for cost-sensitive 24–48 V systems where 60-V rating suffices and loop compensation is acceptable. | Choose for lower-BOM-cost designs within 60-V range - differs in control architecture, pinout, and thermal performance. |
Compared with LM5010SDX, LM5115MTX/NOPB offers higher current flexibility at the cost of added external components and layout complexity, while TPS54160DGQR trades input voltage headroom and control simplicity for lower unit cost in sub-60-V applications.
Availability
LM5010SDX is available at Aetrix Electronics and suitable for telecom point-of-load regulation, automotive post-regulation, and industrial sensor bias supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5010SDX 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 LM5010SDX belongs to TI's high-voltage DC/DC regulator product line, designed specifically for efficient, compact, and robust step-down conversion in 48-V telecom, 42-V automotive, and industrial high-input-voltage applications.
FAQ
What is the maximum input voltage supported by the LM5010SDX?
The LM5010SDX supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This rating applies continuously under normal operation and enables direct interface with 48-V telecom and 42-V automotive power buses. Exceeding 75 V risks permanent damage per the datasheet's stress limits.
Does the LM5010SDX require external compensation components?
No, the LM5010SDX does not require external compensation components. Its constant ON-time hysteretic control architecture eliminates the need for loop compensation networks, simplifying design and improving transient response. This is confirmed in the Features section and Detailed Description of the official LM5010 datasheet (SNVS307G).
How is the output voltage set on the LM5010SDX?
The output voltage of the LM5010SDX is set using an external resistor divider connected to the FB pin, referenced to its internal 2.5-V precision feedback threshold. The formula is VOUT = 2.5 V × (R1 + R2) / R2, where R2 connects from FB to ground and R1 connects from VOUT to FB. This method is explicitly defined in Section 7.3.1 and Figure 8 of the LM5010 datasheet.
What is the purpose of the RON/SD pin on the LM5010SDX?
The RON/SD pin on the LM5010SDX serves dual functions: connecting a resistor from VIN sets the ON-time (and thus operating frequency), while pulling the pin below 0.65 V shuts down the regulator. During shutdown, the soft-start pin is grounded and the ON timer disabled - confirmed in Pin Functions (Section 5) and Device Functional Modes (Section 7.4.1) of SNVS307G.
Can the LM5010SDX operate without an external bootstrap capacitor?
No, the LM5010SDX cannot operate without an external bootstrap capacitor. A 0.022-µF ceramic capacitor between BST and SW is mandatory to sustain gate drive for the integrated N-channel buck switch. The datasheet specifies this value in Pin Functions (Section 5) and Feature Description (Section 7.3.8), noting that insufficient capacitance causes gate drive failure and switch malfunction.
LM5010SDX 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):
- 8V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 70V
- 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)
LM5010SDX FAQ
1.How can I place an order for LM5010SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010SDX 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 LM5010SDX reliable?
The price and inventory of LM5010SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010SDX is usually 5 days.
3.What payment methods are accepted for LM5010SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010SDX?
LM5010SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010SDX 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 LM5010SDX?
For technical support, including LM5010SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010SDX requirements.
6.How does Aetrix verify that LM5010SDX is sourced from the original manufacturer or authorized distributors?
All LM5010SDX 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 LM5010SDX meets industry standards.
7.What is the process for return or replacement of LM5010SDX?
All LM5010SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM5010SDX, 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 LM5010SDX part is unused and in its original packaging.
Return procedure for LM5010SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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