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Texas Instruments LM5010AMHX/NOPB
- Part No.:
- LM5010AMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5010AMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,421
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Product details
Overview
LM5010AMHX/NOPB from Texas Instruments is a high-voltage 1-A synchronous step-down DC/DC switching regulator 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 limit at 1.25 A, programmable soft-start, and thermal shutdown - used in automotive power supplies and telecom secondary-side regulators.
For engineers reviewing the LM5010AMHX/NOPB datasheet, LM5010AMHX/NOPB pinout, LM5010AMHX/NOPB application, or LM5010AMHX/NOPB equivalent, key selection considerations include input voltage range compatibility, valley current limit threshold, BST capacitor requirements for gate drive, thermal pad layout for junction-to-board conduction, and RON resistor selection for ON-time/frequency tuning.
Technical Context
The LM5010AMHX/NOPB 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; OFF-time is fixed at 260 ns. This eliminates loop compensation while maintaining nearly constant frequency across line and load variations.
It integrates a bootstrap-gated N-channel MOSFET driver (BST–SW path), internal 7-V bias regulator with bypass threshold at 8.9 V, and dual comparators for regulation (2.5 V ±2% FB reference) and overvoltage protection (2.9 V threshold). Current limiting occurs during OFF-time via ISEN–SGND sensing with 130 mΩ internal sense resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to 48-V telecom or 42-V automotive buses without pre-regulation. |
| Output Current | 1 A continuous - limited by valley current detection at 1.25 A and thermal design with exposed pad. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; fixed OFF-time of 260 ns enables stable operation without compensation. |
| Feedback Reference | 2.5 V ±2% - sets output voltage via external R1/R2 divider; low 1 nA bias current minimizes divider error. |
| Current Limit Threshold | 1.25 A (typical) - valley-current detection during OFF-time ensures accurate overload protection independent of duty cycle. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - disables switch and ON-timer to prevent catastrophic failure under sustained overload or poor heatsinking. |
| VCC Bias Regulator | 7 V regulated output above 8.9 V VIN; tracks VIN below 8.9 V - reduces external bias supply need but requires ≥0.47 µF local bypass. |
Pinout & Package
LM5010AMHX/NOPB is packaged in a thermally enhanced 10-pin WSON (4.0 mm × 4.0 mm) with exposed thermal pad (EP) for improved junction-to-board heat transfer (RθJB = 13.2°C/W).
| 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 | Supplies gate drive voltage for high-side switch via external capacitor between BST and SW; recharged each OFF-time from VCC. |
| VIN | Main input supply | Accepts 6–75 V DC; requires local bypass capacitors near VIN–RTN to suppress high di/dt transients. |
| VCC | Bias regulator output | Provides internal gate drive and logic power; self-biased up to 8.9 V VIN, then regulated at 7 V; needs ≥0.47 µF ceramic cap. |
| ISEN | Current sense input | Monitors recirculating inductor current during OFF-time; triggers valley current limit when current exceeds 1.25 A. |
| SGND | Sense ground return | Return path for ISEN current and internal current-sense resistor; must be routed separately from power ground to avoid noise coupling. |
| RTN | Circuit ground | Reference return for all internal circuitry except current sense; connects to system ground plane under EP. |
| FB | Voltage feedback | Compares output voltage (via R1/R2 divider) to 2.5 V reference; regulates output with <5 nA input bias current. |
| SS | Soft-start control | Charged by internal 11.5 µA current source to 2.5 V; ramps reference to limit inrush current and prevent current-limit tripping at startup. |
| 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 | Constant ON-time architecture eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Integrated 80-V N-channel buck switch | Enables single-chip 1-A buck converter design without external high-voltage MOSFET or driver IC. |
| Programmable soft-start | Internal 11.5 µA current source charges external SS capacitor, enabling controlled ramp-up of output voltage and inductor current. |
| Exposed thermal pad | Low RθJB = 13.2°C/W allows effective heat dissipation into PCB copper, supporting 1-A operation without heatsink in typical layouts. |
| Valley current limit protection | Detects inductor current minimum during OFF-time, providing accurate overcurrent response independent of input/output voltage ratio. |
Applications
| Automotive Front-End Power Supply | Telecom Secondary-Side Regulator |
|---|---|
Use Scenario: Regulating 42-V battery rail to 3.3 V or 5 V for infotainment microcontrollers and CAN transceivers in passenger vehicles. IC Role / Device Role / Timing Role: Primary non-isolated buck controller delivering 1-A load current with AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient). Use Value: Eliminates need for external high-voltage MOSFET and gate driver; valley current limit prevents latch-up during cold-crank transients. | Use Scenario: Generating isolated 12-V auxiliary supply from 48-V telecom backplane in base station power modules. IC Role / Device Role / Timing Role: Secondary-side post-regulator after isolation transformer; operates at up to 1 MHz to minimize output filter size. Use Value: Fixed 260 ns OFF-time ensures reliable bootstrap capacitor recharge even at high duty cycles; no compensation simplifies design across varying loads. |
| Industrial 24–72 V DC Input Converter | LED Driver Bias Supply |
Use Scenario: Converting unregulated industrial 24–72 V DC bus to stable 15 V for PLC I/O module analog front-ends. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with thermal shutdown and UVLO on VCC to survive brownouts and overtemperature events. Use Value: Wide VIN range accommodates fluctuating factory power; exposed thermal pad enables conduction cooling in sealed enclosures. | Use Scenario: Providing 5 V bias for LED driver ICs in streetlight controllers powered from 48-V battery banks. IC Role / Device Role / Timing Role: Efficient 1-A intermediate supply with programmable soft-start to avoid inrush into downstream capacitive loads. Use Value: RON/SD pin allows coordinated shutdown with main LED driver; 2.5 V FB reference enables precise output setting with standard 1% resistors. |
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 |
|---|---|---|---|
| LM5017MHE/NOPB | Higher 100-V input rating; same 1-A current capability; includes adjustable current limit and external sync input. | Preferred for >75-V transient-prone inputs (e.g., 96-V rail); supports synchronization in multi-rail systems. | Select when input transients exceed 75 V or system-level clock synchronization is required. |
| TPS54160DGQR | 60-V max input; 1.5-A output; integrated compensation; lower quiescent current (116 µA vs 950 µA). | Better suited for battery-powered or low-IQ applications; lacks valley current limit and bootstrap gate drive. | Choose for lower-power 24–60 V systems where ultra-low standby current matters more than 75-V robustness. |
Compared with LM5010AMHX/NOPB, LM5017MHE/NOPB extends input voltage headroom and adds sync capability but increases package size; TPS54160DGQR trades off high-voltage resilience for lower IQ and simplified compensation, making it unsuitable for 48–75 V automotive or telecom rails.
Availability
LM5010AMHX/NOPB is available at Aetrix Electronics and suitable for automotive electronics, telecom secondary-side regulators, and industrial 24–72 V DC input converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM5010AMHX/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 specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability automotive and industrial power solutions.
The LM5010A product line delivers high-voltage buck regulators optimized for 48-V telecom and 42-V automotive power architectures, emphasizing integration, thermal efficiency, and transient robustness without external compensation.
FAQ
What is the maximum recommended input voltage for LM5010AMHX/NOPB?
The absolute maximum input voltage for LM5010AMHX/NOPB is 75 V, with recommended operating range also specified as 6 V to 75 V. Exceeding 75 V risks permanent damage per Absolute Maximum Ratings. The device is designed for stable operation across this full range, including automotive cold-crank (up to 60 V) and telecom nominal 48-V systems.
How does the RON/SD pin function in LM5010AMHX/NOPB?
The RON/SD pin on LM5010AMHX/NOPB serves dual functions: connecting an external resistor from VIN sets the ON-time (and thus switching frequency), while pulling the pin below 0.7 V shuts down the regulator. During shutdown, the SS pin is grounded, the ON-timer disabled, and VCC bypass switched off - reducing VIN current to 100–200 µA.
Can LM5010AMHX/NOPB operate without an external bootstrap capacitor?
No - LM5010AMHX/NOPB requires an external ceramic capacitor (typically 0.022 µF) between BST and SW pins to supply gate drive voltage for the integrated N-channel buck switch. Without it, the high-side driver cannot turn on, preventing regulation. The 260 ns minimum OFF-time ensures sufficient recharge time for this capacitor.
What is the purpose of the SGND and RTN pins on LM5010AMHX/NOPB?
LM5010AMHX/NOPB separates sense ground (SGND) from circuit ground (RTN) to isolate high-noise current-sense return paths from sensitive analog and logic references. SGND carries recirculating inductor current during OFF-time for valley current sensing; RTN serves as the common return for VCC, FB, SS, and internal bias circuits - routing them separately prevents measurement errors.
Is LM5010AMHX/NOPB qualified for automotive use?
Yes - LM5010AMHX/NOPB is identical to the LM5010A-Q1 in silicon and functionality and shares its AEC-Q100 qualification: Device Temperature Grade 1 (–40°C to 125°C ambient), HBM ESD Level 2 (±2000 V), and CDM Level C5 (±750 V). Though the "-Q1" suffix denotes automotive qualification, TI documents LM5010AMHX/NOPB as functionally equivalent and suitable for automotive applications.
LM5010AMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 14-HTSSOP
LM5010AMHX/NOPB FAQ
1.How can I place an order for LM5010AMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010AMHX/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 LM5010AMHX/NOPB reliable?
The price and inventory of LM5010AMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010AMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5010AMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010AMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010AMHX/NOPB?
LM5010AMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010AMHX/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 LM5010AMHX/NOPB?
For technical support, including LM5010AMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010AMHX/NOPB requirements.
6.How does Aetrix verify that LM5010AMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5010AMHX/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 LM5010AMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5010AMHX/NOPB?
All LM5010AMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5010AMHX/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 LM5010AMHX/NOPB part is unused and in its original packaging.
Return procedure for LM5010AMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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