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Texas Instruments LM5010MHX/NOPB
- Part No.:
- LM5010MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5010MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
LM5010MHX/NOPB from Texas Instruments is a high-voltage, 1-A synchronous step-down DC-DC regulator with integrated 75-V N-channel buck switch, valley current limit at 1.25 A, constant ON-time control, and no loop compensation required. It operates across 8 V to 75 V input, delivers adjustable output voltage via 2.5-V precision feedback reference, and targets point-of-load regulation in telecom and automotive power systems.
For engineers reviewing the LM5010MHX/NOPB datasheet, LM5010MHX/NOPB pinout, LM5010MHX/NOPB application, or LM5010MHX/NOPB equivalent, key selection considerations include its 265-ns minimum OFF-time, BST bootstrap capacitor requirement (0.022 µF), thermal shutdown at 175°C, RON/SD shutdown interface, and WSON-10 package with exposed thermal pad for enhanced heat dissipation.
Technical Context
The LM5010MHX/NOPB implements a constant ON-time hysteretic control scheme where tON varies inversely with VIN-enabling stable switching frequency (100 kHz to >1 MHz) across line and load variations without external compensation. Its valley current limit detects recirculating current through ISEN–SGND, triggering OFF-time extension when current exceeds 1.25 A.
Startup uses an internal 7-V regulator (VCC) with 5.8-V UVLO and 11.5-µA soft-start current source charging SS to 2.5 V. Gate drive relies on a floating bootstrap circuit (BST–SW) requiring ≥265 ns OFF-time for capacitor recharge, and thermal shutdown disables switching and grounds SS above 175°C with 20°C hysteresis.
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 bus rails without pre-regulation. |
| Output Current | 1 A continuous - rated for sustained load delivery under thermal limits in WSON-10 package with proper PCB copper area. |
| Switching Frequency | 100 kHz to >1 MHz - determined by VIN and RON resistor; remains stable across line/load due to inverse tON–VIN relationship. |
| Current Limit Threshold | 1.25 A (valley detection) - protects against overload by extending OFF-time when recirculating current exceeds threshold at ISEN. |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting via external resistor divider (VOUT = 2.5 × (R1 + R2)/R2). |
| Thermal Shutdown | 175°C activation, 155°C recovery - prevents catastrophic failure; resets automatically after junction cools with 20°C hysteresis. |
| VCC Regulator Output | 7 V ±6%, 10 mA current limit - powers internal circuitry; can be bypassed with 7.5–14 V external bias to reduce dissipation at high VIN. |
| Minimum OFF-Time | 265 ns ±15% - ensures sufficient time for BST capacitor recharge; sets maximum duty cycle at low VIN. |
Pinout & Package
LM5010MHX/NOPB is packaged in a thermally enhanced 10-pin WSON (DPR) with 4.00 mm × 4.00 mm body and exposed thermal pad for PCB-level heat sinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switching node | Internal N-channel buck switch source terminal; connects to inductor, freewheeling diode, and BST capacitor. |
| 2 (BST) | Bootstrap supply | Drives high-side gate via external 0.022-µF ceramic capacitor between BST and SW; recharged during OFF-time. |
| 3 (ISEN) | Current sense output | Sinks recirculating current from SGND through internal 130-mΩ sense resistor; triggers valley current limit at 1.25 A. |
| 4 (SGND) | Sense ground | Return path for current-sense circuitry only; must be routed separately from power ground to avoid noise coupling. |
| 5 (RTN) | Circuit ground | Reference for all internal circuitry except current sensing; connects to system ground plane near VCC and FB. |
| 6 (FB) | Feedback input | Compares output voltage (via resistor divider) to 2.5-V internal reference; requires ≥25 mV ripple for regulation stability. |
| 7 (SS) | Soft-start control | Charged by 11.5-µA internal current source to 2.5 V; ramps output voltage gradually to limit inrush current. |
| 8 (RON/SD) | ON-time programming / shutdown | Resistor from VIN sets tON; grounding this pin forces shutdown and discharges SS capacitor. |
| 9 (VCC) | Startup regulator output | Internally regulated 7-V supply; powers controller before main switch starts; accepts external 7.5–14 V bias to reduce loss. |
| 10 (VIN) | Main input supply | Accepts 8–75 V DC; powers both startup regulator and buck switch; internal diode connects VIN to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic constant ON-time control eliminates need for external compensation network, reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | Valley current limit and fixed OFF-time enable immediate reaction to load steps without phase-margin trade-offs. |
| Integrated start-up regulator | Self-powered from VIN up to 75 V; eliminates need for auxiliary bias supply in high-input applications. |
| Exposed thermal pad | WSON-10 package includes bottom-exposed copper pad soldered to PCB ground plane, lowering RθJA to 36°C/W. |
| Adjustable shutdown threshold | RON/SD pin accepts resistor divider from VIN for programmable enable/disable logic level, supporting system-level sequencing. |
| Overvoltage protection | 2.9-V FB overvoltage comparator terminates ON-time immediately if output surges, preventing downstream damage. |
Applications
| Telecom Point-of-Load Regulation | Automotive 42-V 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 buck controller delivering 1-A continuous output with fast transient response to handle burst-mode digital loads. Use Value: Eliminates external compensation and reduces solution size vs. voltage-mode controllers; 75-V rating avoids pre-regulator stage. |
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 buck regulator operating in harsh thermal environments with integrated thermal shutdown and robust UVLO. Use Value: Withstands load-dump transients up to 75 V; exposed pad enables reliable operation at 125°C ambient with minimal heatsinking. |
| Industrial High-Voltage Bias Supply | Non-Isolated Secondary Regulator |
|
Use Scenario: Generating isolated gate-drive bias (e.g., 15 V) from 60-V DC link in motor drives or solar inverters. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete MOSFET+controller solutions for auxiliary power rails. Use Value: Integrated 75-V switch and bootstrap driver simplify design; RON/SD pin enables coordinated shutdown with main inverter. |
Use Scenario: Tight-regulation post-converter following a high-efficiency LLC or flyback primary stage in server PSUs. IC Role / Device Role / Timing Role: Final-stage POL regulator optimizing efficiency at light-to-medium loads using discontinuous conduction mode. Use Value: Constant-frequency behavior in CCM and reduced switching loss in DCM maintain >90% efficiency across 10–100% load range. |
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 |
|---|---|---|---|
| LM5009MHX/NOPB | Same family, but rated for 1.5-A peak current and 65-V max input; higher RDS(ON) (1.2 Ω typical) and no valley current limit. | Better suited for lower-current, lower-input applications where thermal margin is less constrained. | Select LM5009MHX/NOPB only if input stays ≤65 V and peak load current remains <1.25 A; not drop-in for LM5010MHX/NOPB's 75-V/1.25-A spec. |
| TPS54160DGQR | 60-V input, 1.5-A current limit, current-mode control with external compensation; requires more external components and larger footprint. | Offers tighter output tolerance and better light-load efficiency via Eco-mode, but lacks integrated bootstrap and valley limiting. | Choose TPS54160DGQR when precise VOUT accuracy (<±1%) or programmable soft-start slope is required; not pin-compatible. |
Compared with LM5009MHX/NOPB and TPS54160DGQR, the LM5010MHX/NOPB uniquely combines 75-V input rating, valley current limiting, and zero-compensation operation in a 4-mm WSON package-making it optimal for space-constrained, high-transient telecom and automotive POL designs where simplicity and ruggedness are prioritized over fine-grained control.
Availability
LM5010MHX/NOPB is available at Aetrix Electronics and suitable for telecom point-of-load regulation, automotive 42-V post-regulation, and industrial high-voltage bias supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5010MHX/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, designing and manufacturing analog ICs, embedded processors, and high-reliability power management solutions for industrial, automotive, and communications markets.
The LM5010MHX/NOPB belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for efficient, compact, and robust step-down conversion from 8 V to 75 V input rails in space- and thermal-constrained environments.
FAQ
What is the maximum input voltage rating for the LM5010MHX/NOPB?
The LM5010MHX/NOPB has an absolute maximum input voltage rating of 75 V, with recommended operating range from 8 V to 75 V. This allows direct connection to 48-V telecom and 42-V automotive bus systems without pre-regulation. Exceeding 75 V risks permanent damage per Absolute Maximum Ratings in the datasheet.
Does the LM5010MHX/NOPB require external loop compensation components?
No, the LM5010MHX/NOPB uses a constant ON-time hysteretic control architecture that inherently stabilizes the feedback loop without external compensation. This eliminates the need for type-II or type-III compensation networks, simplifying design, reducing component count, and improving transient response compared to voltage-mode or current-mode controllers.
How is the switching frequency set on the LM5010MHX/NOPB?
The LM5010MHX/NOPB switching frequency is determined by the input voltage (VIN) and the external RON resistor connected between VIN and the RON/SD pin. The ON-time varies inversely with VIN, resulting in a relatively constant frequency across line and load variations. Typical range is 100 kHz to >1 MHz depending on RON value and VIN.
What is the purpose of the ISEN and SGND pins on the LM5010MHX/NOPB?
The ISEN pin sinks recirculating inductor current during the OFF-time through an internal 130-mΩ sense resistor, enabling valley current limit detection at 1.25 A. SGND is the dedicated return path for this current-sense circuitry-separate from RTN-to prevent noise coupling into the regulation loop and ensure accurate current limiting.
Can the LM5010MHX/NOPB operate without an external bootstrap capacitor?
No-the LM5010MHX/NOPB requires a 0.022-µF ceramic capacitor between BST and SW pins to power the high-side gate driver. The internal bootstrap diode charges this capacitor during each OFF-time, and the minimum 265-ns OFF-time ensures sufficient recharge. Omitting this capacitor will cause gate drive failure and switch malfunction.
What thermal performance can be expected from the LM5010MHX/NOPB in its WSON-10 package?
In the WSON-10 (DPR) package, the LM5010MHX/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 36°C/W when mounted on a 2-layer PCB with 1-in² 2-oz copper pour connected to the exposed thermal pad. This enables 1-A continuous operation at up to 125°C ambient temperature with proper layout and airflow.
LM5010MHX/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):
- 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
LM5010MHX/NOPB FAQ
1.How can I place an order for LM5010MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010MHX/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 LM5010MHX/NOPB reliable?
The price and inventory of LM5010MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5010MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010MHX/NOPB?
LM5010MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010MHX/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 LM5010MHX/NOPB?
For technical support, including LM5010MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010MHX/NOPB requirements.
6.How does Aetrix verify that LM5010MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5010MHX/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 LM5010MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5010MHX/NOPB?
All LM5010MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5010MHX/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 LM5010MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5010MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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