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Texas Instruments LM5010SDX/NOPB
- Part No.:
- LM5010SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM5010SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:8,074
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Product details
Overview
LM5010SDX/NOPB from Texas Instruments is a high-voltage, 1-A synchronous step-down DC-DC switching regulator with integrated 75-V N-channel buck switch, valley current limit at 1.25 A, constant ON-time control architecture, and 8 V to 75 V input range. It delivers regulated output in telecom POL, automotive post-regulation, and industrial high-voltage bias applications.
For engineers reviewing the LM5010SDX/NOPB datasheet, LM5010SDX/NOPB pinout, LM5010SDX/NOPB application, or LM5010SDX/NOPB equivalent, key selection considerations include its no-compensation hysteretic control, thermal shutdown at 175°C, 2.5-V precision feedback reference, BST bootstrap capacitor requirement (0.022 µF), and dual-package availability (WSON-10/HTSSOP-14).
Technical Context
The LM5010SDX/NOPB implements a constant ON-time control scheme where tON varies inversely with VIN - enabling stable switching frequency across line and load variations (100 kHz to >1 MHz). Its valley current limit detection operates during OFF-time via ISEN/SGND sensing, with internal 130-mΩ sense resistance and 150-ns response time.
Regulation relies on ripple-based feedback at FB referenced to 2.5 V ±2%, requiring ≥25 mV of output capacitor ESR for stability. The integrated start-up regulator delivers 7 V ±6% at VCC (10 mA current-limited), with UVLO at 5.8 V and 145-mV hysteresis; external VCC bias (7.5–14 V) disables internal regulation to reduce dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 75 V - supports 48-V telecom and 42-V automotive bus systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for point-of-load bias rails in intermediate bus architectures. |
| Current Limit Threshold | 1.25 A valley limit - enables overload protection while allowing peak currents up to 3.5 A. |
| Feedback Reference | 2.5 V ±2% - sets output voltage via R1/R2 divider; enables precise regulation down to 2.5 V. |
| Switching Frequency Range | 100 kHz to >1 MHz - adjustable via RON resistor; minimum OFF-time fixed at 265 ns. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - protects against sustained overtemperature in enclosed environments. |
| VCC Regulator Output | 7 V ±6% - powers internal circuitry; externally biased VCC (7.5–14 V) reduces thermal stress at high VIN. |
Pinout & Package
LM5010SDX/NOPB is packaged in a thermally enhanced 10-pin WSON (4.00 mm × 4.00 mm) with exposed thermal pad for improved heat dissipation. Pin numbering follows top-view orientation per TI SNVS307G Rev G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internal N-channel FET source - connects to inductor, freewheeling diode, and BST capacitor. |
| BST | Bootstrap supply | Charged from VCC during OFF-time via internal diode; powers high-side gate driver (requires 0.022-µF ceramic cap to SW). |
| VIN | Main input supply | Accepts 8–75 V; powers startup regulator and supplies energy to buck switch during ON-time. |
| VCC | Startup regulator output | 7 V ±6% regulated output; can be externally biased (7.5–14 V) to bypass internal regulator and reduce power loss. |
| ISEN | Current sense input | Monitors recirculating current during OFF-time; interfaces with internal 130-mΩ sense resistor for valley current limiting. |
| SGND | Sense ground | Return path for ISEN current; isolated from RTN to avoid noise coupling into current-sense path. |
| RTN | Circuit ground | Reference for all internal circuitry except current-sense comparator; connects to system ground plane. |
| FB | Feedback input | Compares output voltage (via resistive divider) to 2.5-V reference; requires ≥25 mV ripple for stable hysteretic regulation. |
| SS | Soft-start control | Internally charged by 11.5-µA current source to 2.5 V; ramps output voltage gradually to limit inrush current. |
| RON/SD | ON-time programming / shutdown | Resistor from VIN sets tON; grounding shuts down regulator and discharges SS capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic constant ON-time control eliminates external compensation components and simplifies layout. |
| Ultra-fast transient response | Minimum 265-ns OFF-time enables rapid recovery from load steps without control-loop delay. |
| Integrated start-up regulator | Self-powered from VIN up to 75 V; eliminates need for auxiliary bias supply in high-input designs. |
| Exposed thermal pad | Reduces junction-to-board thermal resistance to 13.2°C/W (WSON), enabling 1-A operation without heatsink. |
| Valley current limit protection | Detects current at inductor's low point during OFF-time, allowing higher peak currents while maintaining safe average limits. |
Applications
| Telecom Point-of-Load Regulator | Automotive High-Voltage Post-Regulator |
|---|---|
Use Scenario: Converts 48-V intermediate bus to 3.3-V or 5-V logic supply in base station RF modules. IC Role / Device Role / Timing Role: Primary buck controller delivering regulated bias rail with fast transient response to burst-mode transceiver loads. Use Value: Eliminates external compensation and reduces BOM count vs. voltage-mode controllers; 1.25-A current limit handles short-duration RF transmit peaks. | Use Scenario: Steps down 42-V battery-derived rail to 12-V or 5-V for ADAS camera ECUs and infotainment subsystems. IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating in harsh thermal environments with wide temperature range (–40°C to 125°C). Use Value: Integrated 75-V switch avoids external MOSFET; thermal shutdown at 175°C prevents failure during under-hood overheating events. |
| Industrial Sensor Bias Supply | Non-Isolated Telecom Buck Converter |
Use Scenario: Powers 24-V analog sensor front-ends from unregulated 36–72-V fieldbus inputs in process automation systems. IC Role / Device Role / Timing Role: Robust primary converter with wide VIN tolerance and EMI-tolerant hysteretic control for noisy factory environments. Use Value: 8–75-V input range accommodates brownouts and surges; 2.5-V feedback reference ensures stable output despite supply ripple. | Use Scenario: Generates –48-V derived +5-V or +3.3-V auxiliary rails in legacy telecom equipment using existing –48-V distribution. IC Role / Device Role / Timing Role: Non-isolated buck regulator replacing discrete solutions in space-constrained line cards. Use Value: WSON-10 package (4 mm × 4 mm) saves PCB area; no optocoupler or transformer needed for secondary-side regulation. |
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 | Automotive-grade AEC-Q100 qualified; wider 4.5–100-V input; 0.6-A output; integrated LDO for bias. | Designed for automotive safety-critical systems; includes watchdog timer and fault reporting pins. | Choose for ASIL-B designs requiring qualification and diagnostics; not drop-in due to different pinout and lower current rating. |
| TPS54160DGQR | Adjustable 3.5-V to 60-V input; 1.5-A output; current-mode control with external compensation. | Requires loop compensation; slower transient response than LM5010SDX/NOPB; no integrated bootstrap diode. | Prefer when design flexibility (e.g., custom slope compensation) outweighs simplicity; larger solution size due to compensation network. |
Compared with LM5010SDX/NOPB, LM5164QDDARQ1 adds automotive qualification but sacrifices output current and introduces complexity for non-automotive use; TPS54160DGQR offers higher current and wider VIN but demands compensation design effort and lacks the ultra-fast transient capability of the hysteretic architecture.
Availability
LM5010SDX/NOPB is available at Aetrix Electronics and suitable for telecom point-of-load, automotive post-regulation, and industrial sensor bias applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5010SDX/NOPB 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5010 product line targets high-input-voltage DC-DC conversion in space- and thermally constrained applications, emphasizing simplicity, robustness, and fast transient response without loop compensation.
FAQ
What is the maximum recommended input voltage for the LM5010SDX/NOPB?
The LM5010SDX/NOPB has an absolute maximum VIN rating of 76 V, with recommended operation up to 75 V. Exceeding this risks permanent damage. The device is specifically designed for 48-V telecom and 42-V automotive bus systems, and its integrated 75-V N-channel buck switch enables direct connection without pre-regulation stages.
Does the LM5010SDX/NOPB require external compensation components?
No, the LM5010SDX/NOPB uses a hysteretic constant ON-time control architecture that eliminates the need for external compensation components. This simplifies design, reduces BOM count, and enables ultra-fast transient response - a core advantage confirmed in TI's SNVS307G datasheet Section 7.3.1 and Feature list.
How does the soft-start function work on the LM5010SDX/NOPB?
The LM5010SDX/NOPB features an internal 11.5-µA current source that charges an external capacitor at the SS pin to 2.5 V, ramping the output voltage gradually. This limits inrush current during startup. The SS pin is actively grounded during VCC undervoltage lockout, thermal shutdown, or RON/SD-driven shutdown - all explicitly defined in Section 7.3.7 of the LM5010SDX/NOPB datasheet.
Can the LM5010SDX/NOPB operate with an externally applied VCC voltage?
Yes, the LM5010SDX/NOPB supports external biasing of the VCC pin between 7.5 V and 14 V. Doing so disables the internal start-up regulator, reducing power dissipation and thermal stress - especially beneficial at high VIN. This mode is fully documented in Section 7.3.2 and Figure 9 of the official datasheet.
What is the purpose of the SGND and RTN pins on the LM5010SDX/NOPB?
On the LM5010SDX/NOPB, SGND serves as the dedicated return path for ISEN current to isolate current-sense signals from noisy power ground, while RTN is the reference ground for all other internal circuitry. Separating these grounds prevents measurement errors caused by IR drops in high-current paths - a critical layout requirement specified in Section 5 (Pin Functions) and Section 10 (Layout) of the datasheet.
LM5010SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM5010SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010SDX/NOPB 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/NOPB reliable?
The price and inventory of LM5010SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5010SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010SDX/NOPB?
LM5010SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010SDX/NOPB 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/NOPB?
For technical support, including LM5010SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010SDX/NOPB requirements.
6.How does Aetrix verify that LM5010SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5010SDX/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM5010SDX/NOPB?
All LM5010SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5010SDX/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM5010SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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