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Texas Instruments LM5010ASD
- Part No.:
- LM5010ASD
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM5010ASD.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
LM5010ASD from Texas Instruments is a high-voltage 1-A synchronous step-down switching regulator IC with integrated 80-V N-channel buck switch, constant ON-time control architecture, and wide 6-V to 75-V input range. It delivers regulated output up to 1 A in thermally enhanced 10-pin WSON package and supports automotive-grade operation (–40°C to 125°C ambient) for secondary-side post-regulation in telecom and vehicle power systems.
For engineers reviewing the LM5010ASD datasheet, LM5010ASD pinout, LM5010ASD application, or LM5010ASD equivalent, key selection considerations include valley current limit (1.25 A), programmable switching frequency up to 1 MHz, 2.5-V ±2% feedback reference, integrated bias regulator, and thermal shutdown at 175°C.
Technical Context
The LM5010ASD implements a constant ON-time regulation scheme where tON is inversely proportional to VIN and set by an external resistor on the RON/SD pin - enabling stable operation without loop compensation. Its valley current limit detection monitors recirculating current through the internal 130-mΩ sense resistor during SW OFF-time, triggering cycle-by-cycle limiting when ISEN current exceeds 1.25 A.
It integrates a bootstrap-gated N-channel buck switch with 0.35 Ω typical RDS(ON), a self-biasing 7-V VCC regulator with bypass threshold at 8.9 V, and dual comparators: one for regulation (2.5 V reference) and one for overvoltage protection (2.9 V threshold). The 260-ns fixed minimum OFF-time ensures reliable BST capacitor recharge and limits maximum duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to 48-V telecom and 42-V automotive buses without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering downstream logic, sensors, or auxiliary rails in industrial and automotive subsystems. |
| Switch RDS(ON) | 0.35 Ω (typ) at TJ ≤125°C - minimizes conduction loss and enables high efficiency (>90% typical at mid-load). |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting via external resistor divider (e.g., 3.3 V, 5 V, 12 V). |
| Valley Current Limit | 1.25 A (typ) - provides cycle-by-cycle overcurrent protection during short-circuit or overload conditions. |
| Switching Frequency | Up to 1 MHz - allows use of small external inductors (e.g., 4.7 µH) and ceramic output capacitors for compact designs. |
| Thermal Shutdown | 175°C (typ) with 20°C hysteresis - protects against sustained overloads or poor PCB thermal design. |
Pinout & Package
LM5010ASD is housed in a thermally enhanced 10-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad for improved heat dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internally connected to source of N-channel buck switch; connects to inductor, freewheeling diode, and BST capacitor. |
| BST | Bootstrap supply | Provides gate drive voltage for high-side switch via external capacitor between BST and SW; requires 0.022-µF ceramic. |
| VIN | Main input supply | Accepts 6–75 V DC; must be bypassed with low-ESR capacitor near RTN pin to suppress transients. |
| VCC | Bias regulator output | Self-generated 7-V supply (regulated above 8.9 V VIN); powers internal circuitry and gate driver; requires ≥0.47-µF local decoupling. |
| ISEN | Current sense input | Monitors valley inductor current during OFF-time; triggers current limit when current exceeds 1.25 A. |
| SGND | Sense ground return | Return path for ISEN current; must be routed separately from power ground to avoid noise coupling into current sense path. |
| RTN | Circuit ground | Reference for all internal circuitry except current sense; connects to system ground plane under exposed pad. |
| FB | Voltage feedback input | Compares output voltage (via resistor divider) to 2.5-V reference; regulates output with ±2% accuracy over temperature. |
| SS | Soft-start control | Charged by internal 11.5-µA current source to 2.5 V; controls ramp-up of output voltage to limit inrush current. |
| RON/SD | ON-time programming / shutdown | Resistor sets tON; grounding disables regulator and forces SS to ground for full shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Integrated 80-V N-channel buck switch | Enables single-chip 1-A buck converter design - eliminates external MOSFET, driver, and associated gate-drive components. |
| Programmable soft-start | Adjustable startup time via external SS capacitor - prevents output overshoot and limits peak inductor current during turn-on. |
| Ultra-fast transient response | Fixed OFF-time + valley current sensing enables immediate reaction to load steps - maintains tight output regulation without complex control loops. |
| Exposed thermal pad | Low-thermal-resistance path (RθJC(bot) = 3°C/W) to PCB - improves power handling and enables reliable 1-A operation in compact layouts. |
Applications
| Telecom Power Conversion | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 48-V telecom bus down to 3.3 V or 5 V for FPGA, PHY, or microcontroller power rails in remote radio units. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator providing stable, efficient DC-DC conversion with minimal external components. Use Value: Enables compact, high-efficiency power delivery across wide input range while meeting EMI and thermal constraints in dense RF enclosures. | Use Scenario: Supplying 5-V rail for door module ECUs, seat controllers, or lighting drivers in 12-V/42-V hybrid vehicle architectures. IC Role / Device Role / Timing Role: Automotive-qualified buck regulator delivering robust 1-A output with AEC-Q100 Grade 1 compliance and thermal fault protection. Use Value: Ensures reliable operation across –40°C to 125°C ambient, withstands load dump and cold crank transients via wide VIN range and integrated protection features. |
| Industrial Sensor Hub Power | Secondary-Side Post Regulator |
Use Scenario: Generating isolated 3.3-V supply for analog front-end and ADC in high-voltage industrial monitoring systems (e.g., motor drives, PLC I/O modules). IC Role / Device Role / Timing Role: Secondary-side synchronous buck regulator following isolation transformer or flyback stage. Use Value: Delivers precise, low-noise output with fast transient response - critical for maintaining ADC reference stability and sensor signal integrity. | Use Scenario: Tight-regulation post-converter after main 48-V-to-12-V DC-DC stage in server power distribution networks. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator optimizing voltage margin and dynamic response for CPU/GPU auxiliary rails. Use Value: Achieves >92% efficiency at 1-A load with minimal footprint - reduces board area and thermal management burden in space-constrained server boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Wider 3–100-V input, 0.6-A output, integrated FET, but lower current rating and no valley current limit. | Preferred for ultra-wide VIN applications below 600 mA; not suitable for 1-A continuous loads. | Select LM5164QDDARQ1 only if input exceeds 75 V or automotive qualification is needed without requiring 1-A capability. |
| TPS54160DGQR | 6–60-V input, 1.5-A output, current-mode control, external MOSFET required, no integrated switch. | Offers higher current and adjustable frequency but demands more external components and compensation design effort. | Choose TPS54160DGQR when higher output current or flexible topology (e.g., synchronous vs. diode rectified) is required, accepting added complexity. |
Compared with LM5010ASD, LM5164QDDARQ1 trades current capability for extended input range and automotive qualification, while TPS54160DGQR provides greater current headroom and control flexibility at the cost of integration and design simplicity.
Availability
LM5010ASD is available at Aetrix Electronics and suitable for telecom power conversion, automotive body electronics, and industrial sensor hub applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM5010ASD 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 LM5010A product line delivers high-voltage, integrated buck regulators optimized for rugged, space-constrained applications in automotive, telecom, and industrial environments - emphasizing simplicity, thermal robustness, and wide-input operation.
FAQ
What is the maximum recommended output current for LM5010ASD in continuous conduction mode?
The LM5010ASD is rated for 1-A continuous output current under recommended operating conditions (TJ ≤125°C, proper PCB thermal design). Peak inductor current should not exceed 2 A, and valley current limit is set at 1.25 A. Derating is required above 85°C ambient or with insufficient copper area on the exposed thermal pad. LM5010ASD achieves this rating using its integrated 80-V N-channel switch and constant ON-time control to maintain regulation without external compensation.
How does the RON/SD pin function in LM5010ASD, and what resistor value sets 500-kHz switching frequency?
The RON/SD pin serves dual functions: applying an external resistor between VIN and RON/SD programs the ON-time (and thus switching frequency), while grounding the pin forces shutdown. For 500 kHz in continuous conduction mode with VIN = 48 V, the required RON is approximately 300 kΩ, calculated using the formula RON = (VOUT × (VIN − 1.4 V)) / (VIN × fS × 1.18×10−10) − 1.4 kΩ. LM5010ASD uses this resistor to determine tON, which varies inversely with VIN to maintain nearly constant frequency.
Can LM5010ASD operate without an external bootstrap capacitor, and what is its minimum required value?
No, LM5010ASD cannot operate without an external bootstrap capacitor. The BST pin requires a capacitor between BST and SW to provide gate drive voltage for the integrated N-channel high-side switch. TI specifies a minimum of 0.022 µF ceramic capacitor (X7R or better) placed as close as possible to the BST and SW pins. Omitting or undersizing this capacitor causes gate drive failure, erratic switching, or complete regulator lockup. LM5010ASD relies on this capacitor being recharged each OFF-time via the internal diode from VCC.
What is the purpose of the SGND and RTN pins on LM5010ASD, and how should they be routed on the PCB?
SGND is the dedicated return path for the internal current sense resistor (RSENSE), carrying recirculating inductor current during the OFF-time; RTN is the reference ground for all other internal circuitry. They must be separated on the PCB: SGND should connect directly to the cathode of the freewheeling diode and return to the ISEN pin via a short, low-inductance trace, while RTN connects to the main system ground plane under the exposed thermal pad. Mixing SGND and RTN compromises current limit accuracy and can cause false triggering. LM5010ASD's valley current limit functionality depends critically on this separation.
Does LM5010ASD support synchronous rectification, and how is the freewheeling diode implemented?
LM5010ASD does not integrate synchronous rectification; it requires an external Schottky or fast-recovery freewheeling diode (e.g., D1 in the typical application diagram). The IC's N-channel buck switch operates in conjunction with this external diode during the OFF-time, when inductor current recirculates through the diode and the internal sense resistor. Synchronous operation would require a second actively controlled switch, which LM5010ASD lacks. Therefore, efficiency optimization for LM5010ASD focuses on selecting a low-VF, low-Qrr diode and minimizing trace inductance - not on synchronous replacement.
LM5010ASD 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):
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (4x4)
LM5010ASD FAQ
1.How can I place an order for LM5010ASD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010ASD 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 LM5010ASD reliable?
The price and inventory of LM5010ASD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010ASD is usually 5 days.
3.What payment methods are accepted for LM5010ASD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010ASD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010ASD?
LM5010ASD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010ASD 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 LM5010ASD?
For technical support, including LM5010ASD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010ASD requirements.
6.How does Aetrix verify that LM5010ASD is sourced from the original manufacturer or authorized distributors?
All LM5010ASD 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 LM5010ASD meets industry standards.
7.What is the process for return or replacement of LM5010ASD?
All LM5010ASD units undergo pre-shipment inspection (PSI). If there is an issue with LM5010ASD, 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 LM5010ASD part is unused and in its original packaging.
Return procedure for LM5010ASD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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