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Texas Instruments LM5010ASDX/NOPB
- Part No.:
- LM5010ASDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM5010ASDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,685
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Product details
Overview
LM5010ASDX/NOPB 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 6 V to 75 V input range. It delivers up to 1 A output current, features valley current limiting at 1.25 A, programmable switching frequency up to 1 MHz, and operates in automotive-grade temperature range (–40°C to 125°C). It is used in non-isolated telecom power supplies and secondary-side post-regulators.
For engineers reviewing the LM5010ASDX/NOPB datasheet, LM5010ASDX/NOPB pinout, LM5010ASDX/NOPB application, or LM5010ASDX/NOPB equivalent, key selection considerations include its wide VIN range, no-loop-compensation design, thermal shutdown behavior, BST bootstrap timing constraints, and RON/SD-based ON-time programming - all critical for high-reliability industrial and automotive DC-DC designs.
Technical Context
The LM5010ASDX/NOPB implements a constant-on-time (COT) regulation scheme where ON-time is inversely proportional to VIN and set by an external resistor on the RON/SD pin. It uses valley current limit detection during the OFF-time via the ISEN pin, with a fixed 260 ns minimum OFF-time to ensure bootstrap capacitor recharge.
Its integrated 80-V N-channel MOSFET switch operates with gate drive powered by the BST-SW bootstrap network, while the internal 7-V bias regulator (VCC) bypasses to VIN below 8.9 V and regulates above that threshold. The FB pin compares against a 2.5 V ±2% reference, and overvoltage protection triggers at 2.9 V.
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 bus systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering downstream logic, sensors, or auxiliary rails in embedded systems. |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and low-profile filter design; frequency set by RON resistor and VIN. |
| Current Limit Threshold | 1.25 A (valley) - protects against overload and short-circuit by disabling next ON-time when ISEN current exceeds threshold. |
| Feedback Reference | 2.5 V ±2% - sets regulated output voltage via external resistor divider (VOUT = 2.5 × (R1 + R2)/R2). |
| Thermal Shutdown | 175°C with 20°C hysteresis - disables switching until junction cools to ~155°C, preventing catastrophic failure under sustained overload. |
| VCC Bias Regulator | 7 V regulated (VIN > 8.9 V); tracks VIN within 100 mV (VIN < 8.9 V) - eliminates need for external bias supply in most applications. |
| Soft-Start Current | 11.5 µA - charges external SS capacitor linearly to 2.5 V, controlling ramp rate of output voltage during startup. |
Pinout & Package
LM5010ASDX/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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internally connected to source of N-channel buck switch; connects to inductor, freewheeling diode, and bootstrap capacitor. |
| BST | Bootstrap supply | Provides gate drive voltage for high-side switch via external capacitor between BST and SW; requires ceramic C4 ≥ 0.022 µF. |
| VIN | Main input supply | Accepts 6–75 V DC; bypass capacitors must be placed close to VIN and RTN pins to minimize noise and EMI. |
| VCC | Bias regulator output | Supplies internal circuitry; self-biased from VIN (6–8.9 V) or regulated at 7 V (VIN > 8.9 V); requires ≥ 0.47 µF ceramic capacitor. |
| ISEN | Current sense input | Monitors recirculating inductor current during OFF-time; current limit comparator trips when ISEN current exceeds 1.25 A. |
| SGND | Sense ground return | Return path for current-sense resistor; must be routed separately from power ground to avoid noise coupling into ISEN. |
| RTN | Circuit ground | Ground return for all internal circuitry except current sense path; connects to system ground plane. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5 V reference; also feeds overvoltage comparator (2.9 V threshold). |
| RON/SD | ON-time control / shutdown | Resistor from VIN sets ON-time; grounding this pin forces shutdown and discharges SS capacitor. |
| SS | Soft-start control | Internal 11.5 µA current source charges external capacitor to 2.5 V, ramping reference voltage and limiting inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time control eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Integrated 80-V N-channel buck switch | Enables single-chip 1-A buck conversion without external high-voltage MOSFET or driver, simplifying design and improving reliability. |
| Programmable soft-start | Adjustable startup time via external SS capacitor prevents output overshoot and limits inrush current into bulk capacitance. |
| Ultra-fast transient response | Fixed OFF-time and COT architecture enable immediate ON-time adjustment to load steps, minimizing output voltage deviation. |
| Exposed thermal pad | Enhances thermal performance in WSON package; requires soldered connection to PCB ground plane for optimal junction-to-board conduction. |
| Valley current limit protection | Detects peak inductor current indirectly during OFF-time, enabling accurate cycle-by-cycle current limiting without high-side sensing. |
Applications
| Telecom Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Step-down conversion from 48-V telecom bus to 3.3 V or 5 V for baseband processors and interface ICs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 1-A output with fast transient response to handle burst-mode traffic loads. Use Value: Eliminates need for external high-voltage MOSFET and gate driver, reducing solution size and bill-of-materials cost in space-constrained telecom line cards. | Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces from 12-V or 42-V vehicle battery rail. IC Role / Device Role / Timing Role: Secondary-side post-regulator providing clean, regulated 3.3 V or 5 V supply with AEC-Q100 Grade 1 qualification (–40°C to 125°C). Use Value: Integrated thermal shutdown and valley current limit protect against load dump, reverse battery, and short-circuit faults common in automotive environments. |
| Industrial IoT Gateway | LED Driver Auxiliary Supply |
Use Scenario: Generating isolated or non-isolated 5 V/1 A supply for ARM-based gateway SoCs operating from wide-input industrial power sources. IC Role / Device Role / Timing Role: High-efficiency primary DC-DC converter supporting variable input (e.g., 24–72 V) and dynamically changing load profiles. Use Value: Constant-frequency operation across line and load ensures predictable EMI profile, easing EMC compliance in dense industrial enclosures. | Use Scenario: Providing stable bias voltage for LED driver ICs or analog front-ends in streetlight or signage systems powered from 24–48 V DC. IC Role / Device Role / Timing Role: Compact, thermally robust post-regulator supplying 5 V or 12 V to driver logic and current-sense amplifiers. Use Value: Exposed thermal pad and 75-V rating allow reliable operation in hot ambient conditions typical of outdoor LED installations. |
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 |
|---|---|---|---|
| LM5164PWPR | 4.5–100 V input, 0.5 A output, integrated 100-V FET, current-mode control | Limited output current; requires loop compensation; lower max current but wider VIN range | Choose LM5164PWPR only if input exceeds 75 V or if current-mode control is preferred for multi-rail synchronization. |
| TPS54160DGQR | 3.5–60 V input, 1.5 A output, external MOSFET required, current-mode control | Requires external high-side switch and driver; higher output current but larger solution size and complexity | Choose TPS54160DGQR only if >1 A output or adjustable current limit is mandatory and board area is not constrained. |
Compared with LM5010ASDX/NOPB, LM5164PWPR offers higher VIN tolerance but lower output capability and added compensation complexity, while TPS54160DGQR provides higher current and flexibility at the cost of external FETs and increased design effort - making LM5010ASDX/NOPB optimal for compact, self-contained 1-A high-voltage buck solutions.
Availability
LM5010ASDX/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, automotive body electronics, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM5010ASDX/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM5010A product line delivers high-voltage, integrated buck regulators optimized for simplicity, reliability, and thermal efficiency in harsh-input applications such as telecom infrastructure and automotive subsystems.
FAQ
What is the maximum recommended input voltage for LM5010ASDX/NOPB?
The absolute maximum input voltage for LM5010ASDX/NOPB is 75 V, and the recommended operating range is 6 V to 75 V. Operation above 75 V risks permanent damage per Absolute Maximum Ratings. For reliable long-term use, maintain VIN ≤ 75 V with appropriate derating margin for transients and ripple - especially critical in automotive load-dump scenarios where ISO 7637-2 pulses may exceed nominal bus voltage.
Does LM5010ASDX/NOPB require external compensation components?
No, LM5010ASDX/NOPB does not require external compensation components due to its constant-on-time (COT) control architecture. The regulation loop is inherently stable across line and load variations, eliminating the need for feedback compensation networks. This simplifies design, reduces component count, and improves immunity to PCB layout parasitics - a key advantage confirmed in the device's "No Loop Compensation Required" feature and functional description.
How is the switching frequency programmed on LM5010ASDX/NOPB?
The switching frequency of LM5010ASDX/NOPB is programmed using an external resistor (RON) connected between VIN and the RON/SD pin. The ON-time - and thus frequency - varies inversely with VIN and is calculated as tON = 1.18×10−10 × (RON + 1.4 kΩ) / (VIN − 1.4 V) + 67 ns. For example, with VIN = 48 V and RON = 200 kΩ, typical tON is ~2.75 µs, yielding ~360 kHz in continuous conduction mode. Frequency increases as VIN decreases or RON decreases.
What is the purpose of the BST and SW pins on LM5010ASDX/NOPB?
The BST and SW pins on LM5010ASDX/NOPB form the bootstrap gate-drive network for the internal N-channel buck switch. A ceramic capacitor (typically 0.022 µF) is connected between BST and SW. During the switch OFF-time, the internal diode charges this capacitor from VCC, enabling the high-side gate driver to generate sufficient VGS to fully enhance the MOSFET. Proper BST capacitor placement and value are essential to maintain gate drive integrity and prevent shoot-through or premature switch turn-off.
Can LM5010ASDX/NOPB be used in automotive applications?
Yes, LM5010ASDX/NOPB is qualified for automotive applications as part of the LM5010A-Q1 family (AEC-Q100 Grade 1: –40°C to 125°C ambient). While LM5010ASDX/NOPB itself is the commercial-grade variant, it shares identical electrical specifications, pinout, and thermal characteristics with the Q1 version and is widely deployed in automotive body electronics, infotainment power supplies, and ADAS subsystems where full AEC-Q100 certification is not mandated by the end customer.
LM5010ASDX/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):
- 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/NOPB FAQ
1.How can I place an order for LM5010ASDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010ASDX/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 LM5010ASDX/NOPB reliable?
The price and inventory of LM5010ASDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010ASDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5010ASDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010ASDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010ASDX/NOPB?
LM5010ASDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010ASDX/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 LM5010ASDX/NOPB?
For technical support, including LM5010ASDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010ASDX/NOPB requirements.
6.How does Aetrix verify that LM5010ASDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5010ASDX/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 LM5010ASDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5010ASDX/NOPB?
All LM5010ASDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5010ASDX/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 LM5010ASDX/NOPB part is unused and in its original packaging.
Return procedure for LM5010ASDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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