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Texas Instruments LM25010MH
- Part No.:
- LM25010MH
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25010MH.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
LM25010MH from Texas Instruments is a 42-V, 1-A step-down switching regulator with integrated N-channel buck switch and constant ON-time control architecture. It operates across 6 V to 42 V input, delivers up to 1 A output current, features valley current limiting at 1.25 A, and supports programmable switching frequency up to 1 MHz - used in automotive post-regulation and telecom power supplies.
For engineers reviewing the LM25010MH datasheet, LM25010MH pinout, LM25010MH application, or LM25010MH equivalent, key selection considerations include its 2.5 V ±2% feedback reference, RON/SD-programmable ON-time, BST bootstrap operation, thermal shutdown at 175°C, and WSON-10 package compatibility with high-density PCB layouts.
Technical Context
The LM25010MH implements a constant ON-time regulation scheme that eliminates loop compensation while enabling ultra-fast transient response. Its ON-time is inversely proportional to VIN and set by an external resistor on the RON/SD pin, yielding nearly constant operating frequency across line and load variations.
It integrates a high-voltage bias regulator (VCC) that tracks VIN below 8.9 V and regulates at 7 V above that threshold, with internal UVLO (5.25 V), gate drive UVLO (1.7–4 V), and valley current sensing via ISEN/SGND pins referenced to a 130 mΩ internal sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide industrial and automotive battery-supplied systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and low-profile output filters in space-constrained designs. |
| Current Limit Threshold | 1.25 A (typical) valley limit - protects against overload and short-circuit while allowing peak currents up to 2 A. |
| Feedback Reference | 2.5 V ±2% - sets precise output voltage via external resistor divider (e.g., 5 V or 3.3 V outputs). |
| Soft Start Current | 11.5 µA - charges external SS capacitor linearly to control ramp rate and suppress inrush current. |
| Thermal Shutdown | 175°C with 20°C hysteresis - disables switching until junction cools to ~155°C, preventing thermal runaway. |
Pinout & Package
LM25010MH is packaged in a thermally enhanced 10-pin WSON (4.00 mm × 4.00 mm) with exposed pad for improved heat dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner adjacent to the exposed pad marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internal N-channel MOSFET source - connects to inductor, freewheeling diode, and bootstrap capacitor (C4). |
| BST | Bootstrap supply | Drives high-side gate via external capacitor between BST and SW; requires ceramic C4 ≥ 0.022 µF. |
| VIN | Main input supply | Accepts 6–42 V; powers internal bias regulator and high-voltage circuitry; bypassed with local ceramic capacitors. |
| VCC | Bias regulator output | Provides 7 V regulated supply when VIN > 8.9 V; tracks VIN below that; requires ≥ 0.47 µF ceramic capacitor. |
| ISEN | Current sense input | Senses recirculating inductor current during OFF-time; triggers valley current limit at 1.25 A. |
| SGND | Current sense ground | Return path for ISEN current; must be routed separately from power ground to avoid noise coupling. |
| RTN | Analog ground return | Reference ground for internal comparators, regulators, and logic - tied to system ground near FB/SS. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5 V reference; minimum 25 mV ripple required for stable operation. |
| SS | Soft start control | Charged by 11.5 µA current source to 2.5 V; controls output voltage ramp and prevents startup overshoot. |
| RON/SD | ON-time programming / shutdown | Resistor from VIN sets ON-time; 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 - reduces BOM count and layout sensitivity. |
| Ultra-fast transient response | Load step recovery within microseconds due to immediate ON-time retriggering upon FB dip - critical for processor core rails. |
| Integrated high-voltage bias regulator | VCC self-generates from VIN (6–42 V); eliminates need for external LDO or charge pump in high-input systems. |
| Programmable soft start | Adjustable ramp time via external SS capacitor - prevents inrush into large output capacitors and downstream circuitry. |
| Valley current limiting | Detects inductor current at valley point during OFF-time - provides accurate overcurrent protection independent of duty cycle. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Supplies 5 V/1 A to microcontroller, CAN transceiver, and sensor interfaces in under-hood ECUs exposed to 40 V load-dump transients. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 12 V/24 V battery to stable 5 V rail with fast transient immunity and thermal fault resilience. Use Value: Withstands 42 V max input and includes thermal shutdown at 175°C - ensures reliability in high-ambient engine bay environments. | Use Scenario: Powers isolated digital I/O modules in factory automation controllers requiring clean 3.3 V at 1 A from 24 V DC bus. IC Role / Device Role / Timing Role: Secondary-side post-regulator delivering tightly regulated output with minimal external components and no compensation design effort. Use Value: 2.5 V ±2% reference and valley current limit enable precise output accuracy and robust short-circuit protection across temperature. |
| Telecom Remote Radio Unit | Commercial HVAC Controller |
Use Scenario: Generates 3.3 V for FPGA configuration and RF front-end bias in outdoor small-cell base stations powered from 48 V PoE-derived supply. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating up to 1 MHz to minimize EMI and allow use of small 1 µH inductors. Use Value: Programmable frequency via RON resistor allows EMI tuning; BST bootstrap enables efficient high-side drive without external gate driver. | Use Scenario: Provides 5 V rail to MCU, display, and communication interfaces in wall-mounted thermostats using 24 V AC-DC adapter input. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator in space-limited enclosures where WSON-10 footprint and exposed pad aid heat transfer. Use Value: RθJA = 36°C/W (WSON) enables full 1 A operation without heatsink at 50°C ambient - simplifies mechanical design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011MH | Same family, 2-A rated output; higher RDS(ON) (0.45 Ω vs 0.35 Ω typ); identical pinout and control architecture. | Supports higher load currents but dissipates more heat at 1 A; requires thermal review for same PCB layout. | Select LM25011MH only if future-proofing for >1 A loads or if marginally higher dropout is acceptable. |
| TPS54160DGQ | 60 V input, 1.5 A, current-mode control; requires external compensation; different pinout (10-pin MSOP); no integrated BST diode. | Broader input range and higher current, but slower transient response and more complex loop design than LM25010MH. | Choose TPS54160DGQ when input exceeds 42 V or when current-mode stability analysis is preferred over constant ON-time simplicity. |
Compared with LM25010MH, LM25011MH offers headroom for higher current but increases conduction loss, while TPS54160DGQ trades ease of design for extended input range and current capability - making LM25010MH optimal for cost-sensitive, thermally constrained 6–42 V, 1 A applications.
Availability
LM25010MH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and telecom remote radio units requiring stable component supply with long-term manufacturability and AEC-Q100 Grade 1 qualification.
Supply support for LM25010MH 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 technologies with decades of automotive-grade product development experience.
The LM25010MH belongs to TI's high-voltage buck regulator product line, designed specifically for reliable, low-component-count DC-DC conversion in harsh environments such as automotive and industrial power systems.
FAQ
What is the maximum input voltage rating for the LM25010MH?
The LM25010MH has an absolute maximum input voltage rating of 45 V, with recommended operation from 6 V to 42 V. Exceeding 42 V continuously risks violating recommended operating conditions, though brief transients up to 45 V are tolerated per absolute maximum ratings. The device includes built-in protection features including VCC undervoltage lockout and thermal shutdown to enhance robustness in real-world automotive and industrial applications where load dump or surge events may occur. Always verify layout and input filtering for transient suppression when operating near the upper limit.
Does the LM25010MH require external compensation components?
No, the LM25010MH does not require external compensation components due to its constant ON-time control architecture. This eliminates the need for traditional Type II or Type III compensation networks, significantly simplifying design and reducing bill-of-materials count. Stability is inherently maintained across line and load variations, and the regulator achieves ultra-fast transient response without loop tuning. However, proper placement of input/output capacitors, BST capacitor, and SS capacitor remains critical - especially ensuring ≥25 mV of ripple at the FB pin for fixed-frequency operation in continuous conduction mode.
How is the switching frequency programmed on the LM25010MH?
The switching frequency of the LM25010MH is programmed indirectly via the RON resistor connected between VIN and the RON/SD pin. The ON-time is determined by VIN and RON, and frequency varies inversely with ON-time. For continuous conduction mode, FS ≈ VOUT × (VIN − 1.4 V) / [1.18×10⁻¹⁰ × (RON + 1.4 kΩ) × VIN]. Typical RON values range from 50 kΩ (higher frequency) to 500 kΩ (lower frequency), supporting operation from <100 kHz up to 1 MHz. The actual frequency also depends on input/output voltages and inductor value, so final verification requires bench measurement under load.
What package type is used for the LM25010MH, and how is thermal performance characterized?
The LM25010MH uses the 10-pin WSON package (DPR variant) with 4.00 mm × 4.00 mm body size and exposed thermal pad. Its thermal performance is characterized by RθJA = 36°C/W (junction-to-ambient, JEDEC standard), RθJC(bot) = 3°C/W (junction-to-case bottom), and RθJB = 13.2°C/W (junction-to-board). These metrics assume proper PCB layout with the exposed pad soldered to a minimum 100 mm² copper area connected to internal ground planes. At 1 A load and 24 V input, typical power dissipation is ~0.5 W - enabling full-rated operation at up to 75°C ambient without forced airflow when layout guidelines are followed.
Can the LM25010MH be used in automotive applications, and what qualifications does it hold?
Yes, the LM25010MH is qualified for automotive applications under AEC-Q100 Grade 1 (−40°C to +125°C ambient) and Grade 0 (−40°C to +150°C ambient). It meets HBM ESD Level 2 (±2000 V) and CDM Level C5 (±750 V), and is specified for use in body control modules, infotainment power supplies, and ADAS subsystems. While the LM25010MH itself is the commercial-grade part, its pin-compatible automotive variant LM25010Q1MH carries full AEC-Q100 certification - meaning LM25010MH may be used in non-safety-critical automotive designs where qualification documentation is not mandated, but LM25010Q1MH is required for ASIL-B or higher compliance.
LM25010MH 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):
- 6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 37V
- 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
LM25010MH FAQ
1.How can I place an order for LM25010MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010MH 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 LM25010MH reliable?
The price and inventory of LM25010MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010MH is usually 5 days.
3.What payment methods are accepted for LM25010MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010MH?
LM25010MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010MH 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 LM25010MH?
For technical support, including LM25010MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010MH requirements.
6.How does Aetrix verify that LM25010MH is sourced from the original manufacturer or authorized distributors?
All LM25010MH 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 LM25010MH meets industry standards.
7.What is the process for return or replacement of LM25010MH?
All LM25010MH units undergo pre-shipment inspection (PSI). If there is an issue with LM25010MH, 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 LM25010MH part is unused and in its original packaging.
Return procedure for LM25010MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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