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Texas Instruments LM5010ASDX
- Part No.:
- LM5010ASDX
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM5010ASDX.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
LM5010ASDX 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 voltage via external resistor divider (FB pin), features valley current limiting at 1.25 A, programmable soft-start, and thermal shutdown - used in automotive post-regulators and telecom power supplies.
For engineers reviewing the LM5010ASDX datasheet, LM5010ASDX pinout, LM5010ASDX application, or LM5010ASDX equivalent, key selection considerations include its 10-pin WSON package with exposed thermal pad, 2.5-V ±2% feedback reference, no-loop-compensation design, 260-ns minimum off-time, and compatibility with 48-V/60-V industrial bus systems.
Technical Context
The LM5010ASDX employs a constant-on-time (COT) regulation scheme where on-time is inversely proportional to input voltage and set by an external resistor (RON/SD pin), enabling stable operation without loop compensation. Its valley current limit detection occurs during switch-off via internal 130-mΩ sense resistor between ISEN and SGND, triggering cycle-by-cycle protection at 1.25 A.
It integrates a high-voltage bias regulator that tracks VIN below 8.9 V and regulates VCC to 7 V above that threshold, with UVLO at 5.25 V and gate drive UVLO at 1.7–4 V (BST–SW). The device operates in continuous conduction mode under heavy load and transitions to discontinuous mode at light loads, maintaining near-constant frequency across line and load variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to 48-V telecom, 60-V industrial, and 12–42-V automotive buses without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh-environment applications. |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V) using standard resistor dividers with <5 nA bias current. |
| Valley Current Limit | 1.25 A typical - protects against overload and short-circuit by disabling next on-time when recirculating current exceeds threshold. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; fixed 260-ns minimum off-time ensures bootstrap capacitor recharge and stable high-frequency operation. |
| Thermal Shutdown | 175°C with 20°C hysteresis - disables switch and on-timer to prevent catastrophic failure during sustained overtemperature conditions. |
| VCC Bias Regulator | 7 V regulated (VIN > 8.9 V), VIN-tracking (VIN < 8.9 V) - eliminates need for external bias supply while supporting external VCC injection up to 13 V. |
Pinout & Package
LM5010ASDX 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 |
|---|---|---|
| 1 SW | Switching node | Internally connected to source of N-channel buck switch; connects to inductor, freewheeling diode, and bootstrap capacitor (C4). |
| 2 BST | Bootstrap supply | Supplies gate drive voltage for high-side switch; requires ceramic capacitor (0.022 µF) between BST and SW. |
| 3 ISEN | Current sense input | Monitors recirculating inductor current during off-time; triggers valley current limit when current exceeds 1.25 A. |
| 4 SGND | Sense ground | Return path for current-sense resistor; isolated from RTN to avoid noise coupling into regulation loop. |
| 5 RTN | Circuit ground | Ground return for all internal circuitry except current sense; connects to system ground plane near input capacitors. |
| 6 FB | Feedback input | Compares output voltage (via resistor divider) to 2.5-V reference; <5 nA bias current enables high-impedance sensing. |
| 7 SS | Soft-start control | Internal 11.5-µA current source charges external capacitor to ramp reference voltage and limit inrush current. |
| 8 RON/SD | On-time control / shutdown | Resistor sets on-time; grounding forces shutdown with reduced quiescent current (≤200 µA). |
| 9 VCC | Bias regulator output | Provides gate drive and internal logic power; self-biased (tracks VIN or regulates to 7 V); accepts external 7.5–13 V supply. |
| 10 VIN | Main input supply | Accepts 6–75 V DC; requires local bypass capacitor (≥1 µF ceramic) between VIN and RTN. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time architecture eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | On-demand switching enables immediate reaction to load steps without phase-margin trade-offs inherent in voltage-mode controllers. |
| Integrated 80-V N-channel buck switch | Reduces external component count; RDS(on) = 0.35 Ω (typ) at TJ ≤125°C enables high efficiency at 1-A load. |
| Programmable soft-start | External capacitor on SS pin controls startup slew rate, preventing output overshoot and limiting inrush into bulk capacitance. |
| Exposed thermal pad | Enables low junction-to-board thermal resistance (13.2°C/W), critical for reliable 1-A operation in compact industrial enclosures. |
Applications
| Automotive Post-Regulator | Telecom 48-V Intermediate Bus |
|---|---|
Use Scenario: Regulating 42-V battery-derived rail down to 3.3 V or 5 V for ADAS camera modules and infotainment ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, high-efficiency DC-DC conversion with AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient). Use Value: Eliminates need for external gate driver and high-voltage MOSFET, reducing solution size by >30% versus discrete controllers. | Use Scenario: Stepping down 48-V telecom intermediate bus to 12 V for powering fan controllers, monitoring ASICs, and optical transceiver bias supplies. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating at 500 kHz with minimal output ripple and fast load transient recovery. Use Value: Achieves >92% peak efficiency at 1-A load with no external compensation, simplifying compliance with NEBS GR-63-CORE shock/vibration requirements. |
| Industrial PLC Power Supply | Off-Grid Solar Charge Controller |
Use Scenario: Converting unregulated 24–72-V DC from industrial power distribution rails to stable 5 V for microcontroller and I/O conditioning circuits. IC Role / Device Role / Timing Role: Robust primary regulator with thermal shutdown, input UVLO, and gate-drive UVLO protecting against brownouts and overheating in factory-floor environments. Use Value: Withstands 75-V transients per IEC 61000-4-5 Level 4, enabling direct connection to long cable runs without additional TVS clamping. | Use Scenario: Regulating variable PV array output (30–70 V) to charge 24-V battery banks in remote solar installations with wide temperature swings. IC Role / Device Role / Timing Role: High-voltage buck converter operating across full input range with valley current limit preventing MOSFET overstress during cold-start battery charging. Use Value: Maintains regulation down to 6 V input, allowing continued operation during partial shading or low-light conditions when array voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5160APWPR | Wider 3–65-V input, integrated 1.5-A switch, but requires external compensation and lacks valley current limit. | Preferred for lower-input-voltage designs (<24 V) and higher-current needs (>1 A); less suitable for 48–75-V telecom inputs. | Select LM5160APWPR only if input voltage stays below 65 V and loop stability tuning is acceptable. |
| MAX17504ATP+T | 6–60-V input, 2.5-A capability, current-mode control with full compensation, but no integrated bootstrap diode or VCC tracking. | Better for high-current, multi-rail industrial systems requiring tight cross-regulation; not qualified for automotive use. | Choose MAX17504ATP+T when output current exceeds 1 A and design allows added compensation components. |
Compared with LM5010ASDX, LM5160APWPR offers higher current but narrower high-end input range and added complexity, while MAX17504ATP+T provides greater current headroom at the cost of board area and thermal management overhead - LM5010ASDX remains optimal for space-constrained, high-input-voltage, single-rail 1-A applications.
Availability
LM5010ASDX is available at Aetrix Electronics and suitable for automotive electronics, telecommunications infrastructure, and industrial PLC power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5010ASDX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5010ASDX belongs to TI's high-voltage DC-DC regulator product line, designed specifically for efficient, compact, and robust power conversion in 24–75-V input systems where reliability under voltage transients and thermal stress is critical.
FAQ
What is the maximum input voltage rating for the LM5010ASDX?
The LM5010ASDX has an absolute maximum input voltage rating of 76 V (VIN to RTN), with recommended continuous operation up to 75 V. It is rated for 75-V operation per datasheet Section 6.4, and its integrated 80-V N-channel buck switch supports safe operation within this range. Exceeding 75 V may trigger overvoltage protection or reduce reliability - always observe derating guidelines in TI's SNVS376F datasheet for LM5010ASDX.
Does the LM5010ASDX require external compensation components?
No, the LM5010ASDX does not require external compensation components. Its constant-on-time (COT) control architecture eliminates the need for loop compensation networks, simplifying design and improving transient response. This is confirmed in the Features section and Section 7.3.1 of the LM5010ASDX datasheet, which states "no loop compensation required" and attributes this to the COT scheme's inherent stability across line and load variations.
How is the switching frequency programmed on the LM5010ASDX?
The switching frequency of the LM5010ASDX is programmed using an external resistor connected between VIN and the RON/SD pin. The on-time is inversely proportional to VIN and set by this resistor; typical values range from 50 kΩ to 511 kΩ to achieve frequencies from ~80 kHz to ~1 MHz. Equation 7 in the LM5010ASDX datasheet provides the exact calculation: RON = [VOUT × (VIN − 1.4 V)] / [VIN × FS × 1.18×10⁻¹⁰ − 1.4 kΩ].
What is the purpose of the SGND and RTN pins on the LM5010ASDX?
The SGND (sense ground) and RTN (return) pins on the LM5010ASDX serve separate grounding functions: SGND carries only the recirculating current from the internal current-sense resistor (RSENSE), isolating it from noisy power return paths; RTN is the main circuit ground return for all other internal blocks. This separation prevents current-sense signal corruption and ensures accurate valley current limiting - a key feature of the LM5010ASDX's protection scheme.
Can the LM5010ASDX be used in automotive applications?
Yes, the LM5010ASDX is qualified for automotive applications as part of the LM5010A-Q1 family, meeting AEC-Q100 Grade 1 (–40°C to 125°C ambient) and Grade 0 (–40°C to 150°C ambient) requirements. While LM5010ASDX itself is the commercial-grade variant, its identical silicon and pinout make it suitable for non-safety-critical automotive subsystems where full AEC-Q100 certification is not mandated - always verify qualification status per orderable part number and TI's official documentation for LM5010ASDX.
LM5010ASDX 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)
LM5010ASDX FAQ
1.How can I place an order for LM5010ASDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010ASDX 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 LM5010ASDX reliable?
The price and inventory of LM5010ASDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010ASDX is usually 5 days.
3.What payment methods are accepted for LM5010ASDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010ASDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010ASDX?
LM5010ASDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010ASDX 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 LM5010ASDX?
For technical support, including LM5010ASDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010ASDX requirements.
6.How does Aetrix verify that LM5010ASDX is sourced from the original manufacturer or authorized distributors?
All LM5010ASDX 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 LM5010ASDX meets industry standards.
7.What is the process for return or replacement of LM5010ASDX?
All LM5010ASDX units undergo pre-shipment inspection (PSI). If there is an issue with LM5010ASDX, 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 LM5010ASDX part is unused and in its original packaging.
Return procedure for LM5010ASDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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