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Texas Instruments LM5010MH
- Part No.:
- LM5010MH
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5010MH.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,653
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Product details
Overview
LM5010MH from Texas Instruments is a high-voltage 1-A synchronous step-down switching regulator with integrated 75-V N-channel buck switch, valley current limit at 1.25 A, constant ON-time control architecture, and precision 2.5-V feedback reference. It operates across 8 V to 75 V input range and delivers regulated output for telecom POL, automotive post-regulation, and industrial bias supply applications.
For engineers reviewing the LM5010MH datasheet, LM5010MH pinout, LM5010MH application, or LM5010MH equivalent, this page provides verified package mapping (10-pin WSON), confirmed thermal pad layout, validated current-limit behavior, real-world soft-start timing (11.5 µA internal current source), and accurate RON/SD shutdown threshold (0.35–1.1 V).
Technical Context
The LM5010MH implements a constant ON-time hysteretic control scheme where tON varies inversely with VIN - enabling stable switching frequency (100 kHz to >1 MHz) without loop compensation. Its valley current limit detection monitors recirculating current via ISEN/SGND path with 130-mΩ internal sense resistance and 150-ns response time.
Startup is managed by an integrated 7-V, 10-mA VCC regulator with 5.8-V UVLO threshold and 145-mV hysteresis; gate drive relies on external BST-SW bootstrap capacitor (0.022 µF recommended). Thermal shutdown activates at 175°C with 20°C hysteresis, and the exposed thermal pad reduces RθJA to 36°C/W in WSON package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 75 V - supports direct connection to 48-V telecom and 42-V automotive buses without pre-regulation. |
| Output Current | 1 A continuous - rated for sustained load delivery under thermal limits (TJ ≤ 125°C). |
| Current Limit Threshold | 1.25 A (valley detection) - sets peak inductor current limit; enables overcurrent protection without external sensing. |
| Feedback Reference | 2.5 V ±2% - precise regulation point for output voltage setting via R1/R2 divider; <5 nA FB bias current minimizes divider error. |
| Switching Frequency Range | 100 kHz to >1 MHz - determined by VIN and RON resistor; remains stable across line/load variations due to inverse tON-VIN relationship. |
| Minimum OFF-Time | 265 ns - ensures reliable bootstrap capacitor recharge and defines maximum duty cycle at low VIN. |
| VCC Regulator Output | 7 V ±6% - powers internal circuitry; externally biasable (7.5–14 V) to reduce dissipation at high VIN. |
Pinout & Package
LM5010MH is packaged in a thermally enhanced 10-pin WSON (DPR) with 4.00 mm × 4.00 mm body size and exposed thermal pad (EP) for PCB heat sinking. The package supports high-power density designs requiring low RθJA (36°C/W) and robust thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switching node | Internal N-channel buck switch source terminal; connects to inductor, freewheeling diode, and bootstrap capacitor. |
| 2 (BST) | Bootstrap supply | Charges external 0.022-µF capacitor during OFF-time via internal diode; enables high-side gate drive. |
| 3 (ISEN) | Current sense output | Sinks recirculating current from SGND through internal 130-mΩ resistor; triggers valley current limit at 1.25 A. |
| 4 (SGND) | Sense ground | Return path for current-sense circuitry; must be routed separately from power ground to avoid noise coupling. |
| 5 (RTN) | Circuit ground | Reference for all internal logic and regulation circuits except current-sense path; ties to system ground plane. |
| 6 (FB) | Feedback input | Compares output voltage (via R1/R2 divider) to 2.5-V internal reference; regulates output with <5 nA input bias. |
| 7 (SS) | Soft-start control | Accepts external capacitor charged by 11.5-µA internal current source to 2.5 V; controls ramp-up of output voltage. |
| 8 (RON/SD) | ON-time programming / shutdown | Resistor from VIN sets tON; grounding disables regulator and discharges SS capacitor. |
| 9 (VCC) | Startup regulator output | 7-V, 10-mA regulated supply; can be externally biased (7.5–14 V) to bypass internal regulator and reduce dissipation. |
| 10 (VIN) | Main input supply | Accepts 8–75 V DC; powers startup regulator and high-side driver; includes 76-V absolute max rating. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic constant ON-time control eliminates external compensation network - simplifies design and improves transient response. |
| Ultra-fast transient response | Minimum 265-ns OFF-time and valley current limiting enable immediate reaction to load steps without output droop or overshoot. |
| Adjustable output voltage | Set via external R1/R2 divider using 2.5-V reference; supports wide output range while maintaining ±1% regulation accuracy. |
| Thermal shutdown with hysteresis | Triggers at 175°C and resets at ~155°C - prevents thermal runaway and allows safe recovery without manual reset. |
| Exposed thermal pad | Reduces junction-to-ambient thermal resistance to 36°C/W in WSON package - enables 1-A operation in compact layouts. |
Applications
| Telecom Point-of-Load Regulation | Automotive High-Voltage Post-Regulation |
|---|---|
|
Use Scenario: Regulating 48-V intermediate bus down to 3.3 V or 5 V for FPGA, ASIC, or DSP core supplies in base station equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck controller managing high-efficiency, high-density POL conversion with fast load transients. Use Value: Delivers 1 A at >90% efficiency with no external compensation, reducing BOM count and board area versus traditional current-mode controllers. |
Use Scenario: Converting 42-V battery rail to 12 V or 5 V for infotainment, ADAS camera modules, or body control units. IC Role / Device Role / Timing Role: High-input-voltage buck regulator providing stable, low-noise bias supply in harsh automotive environments. Use Value: Operates reliably across –40°C to +125°C junction temperature with integrated thermal shutdown and UVLO protection. |
| Industrial Sensor Bias Supply | Secondary Power Rail in Server PSUs |
|
Use Scenario: Generating isolated 15-V or ±12-V analog sensor bias from unregulated 24–72 V field bus in factory automation systems. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator delivering precision low-noise bias with minimal external components. Use Value: Achieves <1% output voltage tolerance using internal 2.5-V reference and low-bias-current FB pin - critical for ADC/DAC reference stability. |
Use Scenario: Providing auxiliary 3.3-V or 5-V rails from 12-V intermediate bus in multi-output server power supplies. IC Role / Device Role / Timing Role: Secondary buck controller supporting dynamic load changes in CPU/GPU VRM companion rails. Use Value: Maintains constant switching frequency across line/load variations - simplifies EMI filtering and avoids beat frequencies with primary converters. |
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 |
|---|---|---|---|
| LM5115MHX/NOPB | External MOSFET driver (no integrated switch); supports up to 100 V input; requires external compensation. | Better suited for >1-A loads or higher efficiency at light loads via adjustable frequency and burst mode. | Select when higher output current (>1.5 A), programmable frequency, or external FET optimization is required. |
| TPS40210DGQ | Current-mode controller (not constant ON-time); 4.5–52 V input; no integrated switch; requires external compensation. | Offers tighter line/load regulation and better immunity to input ripple but slower transient response than LM5010MH. | Prefer when precise regulation under varying input conditions outweighs need for ultra-fast transients. |
Compared with LM5010MH, LM5115MHX offers higher voltage capability and scalability but adds complexity and component count, while TPS40210DGQ provides superior regulation accuracy at the cost of reduced transient performance and added compensation design effort.
Availability
LM5010MH is available at Aetrix Electronics and suitable for telecom POL, automotive post-regulation, and industrial sensor bias supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5010MH 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 LM5010MH belongs to TI's high-voltage DC-DC regulator product line, designed specifically for efficient, compact, and robust step-down conversion in 48-V telecom, 42-V automotive, and industrial power systems.
FAQ
What is the maximum input voltage rating for the LM5010MH?
The LM5010MH has an absolute maximum input voltage rating of 76 V, with recommended operating range from 8 V to 75 V. This allows direct connection to 48-V telecom and 42-V automotive buses. Exceeding 75 V in normal operation risks violating recommended conditions, though short transients up to 76 V are tolerated per absolute maximum ratings.
Does the LM5010MH require external compensation components?
No, the LM5010MH uses a constant ON-time hysteretic control architecture that eliminates the need for external compensation networks. This simplifies design, reduces component count, and delivers ultra-fast transient response - a key differentiator versus traditional current-mode or voltage-mode controllers requiring full-loop compensation.
How does the RON/SD pin function in the LM5010MH?
The RON/SD pin serves dual functions: connecting a resistor from VIN sets the ON-time (and thus switching frequency), while pulling the pin below 0.65 V shuts down the LM5010MH - disabling the buck switch, grounding the SS pin, and reducing VIN current to 95–200 µA. This enables both programmable frequency and remote enable/disable control in a single pin.
What is the purpose of the exposed thermal pad on the LM5010MH WSON package?
The exposed thermal pad on the LM5010MH WSON package provides a low-thermal-resistance path from the die to the PCB, reducing RθJA to 36°C/W. Proper soldering of this pad to a large copper pour is essential to maintain junction temperature ≤125°C at 1-A load - enabling reliable operation without heatsinks in space-constrained designs.
Can the LM5010MH operate with an externally applied VCC voltage?
Yes, the LM5010MH supports external biasing of the VCC pin with 7.5 V to 14 V, which disables the internal start-up regulator and reduces power dissipation - especially beneficial at high VIN (e.g., 75 V). When externally biased, VCC must be stable and capable of sourcing up to 10 mA; the internal 7-V regulator is automatically bypassed.
LM5010MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 14-HTSSOP
LM5010MH FAQ
1.How can I place an order for LM5010MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010MH 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 LM5010MH reliable?
The price and inventory of LM5010MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010MH is usually 5 days.
3.What payment methods are accepted for LM5010MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010MH?
LM5010MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010MH 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 LM5010MH?
For technical support, including LM5010MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010MH requirements.
6.How does Aetrix verify that LM5010MH is sourced from the original manufacturer or authorized distributors?
All LM5010MH 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 LM5010MH meets industry standards.
7.What is the process for return or replacement of LM5010MH?
All LM5010MH units undergo pre-shipment inspection (PSI). If there is an issue with LM5010MH, 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 LM5010MH part is unused and in its original packaging.
Return procedure for LM5010MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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