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Texas Instruments LM25010MHX
- Part No.:
- LM25010MHX
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25010MHX.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
LM25010MHX 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 2.5 V ±2% feedback reference, valley current limit at 1.25 A, and programmable switching frequency up to 1 MHz - used in automotive post-regulation and telecom DC-DC conversion.
For engineers reviewing the LM25010MHX datasheet, LM25010MHX pinout, LM25010MHX application, or LM25010MHX equivalent, key selection considerations include its wide-input-range capability, no-loop-compensation design, thermal shutdown (175°C), RON/SD shutdown interface, and WSON-10 package suitability for space-constrained industrial and automotive power supplies.
Technical Context
The LM25010MHX implements a constant ON-time regulation scheme where tON varies inversely with VIN, enabling nearly constant operating frequency across line and load variations. Its valley current limiting detects recirculating current via ISEN–SGND path with 1.25 A threshold and 130 mΩ internal sense resistance.
It integrates a high-voltage bias regulator that bypasses VIN to VCC below 8.9 V and regulates VCC at 7 V above that threshold, with UVLO at 5.25 V and 180 mV hysteresis. The bootstrap driver (BST–SW) supports N-channel MOSFET gate drive with minimum 260 ns OFF-time for capacitor recharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports direct connection to 12 V/24 V/36 V automotive and industrial bus rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Feedback Reference | 2.5 V ±2% - enables precise output voltage setting using standard resistor dividers (e.g., 3.3 V, 5 V, 12 V). |
| Valley Current Limit | 1.25 A typical - protects against overload by disabling switch until inductor current falls below threshold during OFF-time. |
| Switching Frequency | Up to 1 MHz - allows compact magnetics and low-profile output filters; set via external RON resistor. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - prevents permanent damage during sustained overloads or poor heatsinking. |
| VCC Bias Regulator | 7 V regulated output (VIN > 8.9 V); tracks VIN within 100 mV (VIN < 8.9 V) - eliminates need for external bias supply. |
| Soft Start Current | 11.5 µA internal source - controls ramp rate of output voltage via external SS capacitor, limiting inrush current. |
Pinout & Package
LM25010MHX is housed in a thermally enhanced 10-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad. The package supports high-power density layouts and requires PCB ground connection to the exposed pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Primary DC input (6–42 V); connects to bulk input capacitor and RTN return path. |
| SW | Switching node | Drain of internal N-MOSFET; connects to inductor, freewheeling diode, and bootstrap capacitor. |
| BST | Bootstrap supply | Charges external BST–SW capacitor during OFF-time via internal diode; enables high-side N-FET gate drive. |
| ISEN | Current sense input | Monitors 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 | Regulator ground | Ground reference for internal circuitry (excluding current sense path); connects to system ground plane. |
| FB | Feedback input | Compares output voltage divider ratio against 2.5 V reference; sets regulated output voltage. |
| RON/SD | ON-time control / shutdown | Resistor-programmed tON; grounding disables regulator and discharges soft-start capacitor. |
| SS | Soft start | Internal 11.5 µA current charges external capacitor to ramp reference voltage and control startup slew rate. |
| VCC | Bias supply output | Internally generated 7 V (or VIN-tracked) supply for gate driver and control logic; requires ≥0.47 µF local decoupling. |
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 when FB falls below 2.5 V. |
| Integrated high-voltage bias regulator | Eliminates need for external LDO or charge pump; supports direct 6–42 V input without auxiliary supply. |
| Programmable soft start | Adjustable startup time via external SS capacitor - prevents output overshoot and limits inrush into downstream capacitance. |
| Thermal shutdown with hysteresis | Auto-recovery at ~155°C after 175°C trip - avoids latch-up while protecting silicon under sustained overload. |
| Valley current limiting | Detects inductor current at zero-crossing point - ensures accurate current foldback without sensing peak spikes or noise. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V Field Bus Power |
|---|---|
Use Scenario: Powering MCU, CAN transceivers, and sensor interfaces in door modules or lighting controllers supplied from vehicle battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3 V or 5 V from unregulated battery rail. Use Value: Withstands 42 V transients per ISO 7637-2; 1.25 A current limit prevents fuse blowing during short-circuit events. | Use Scenario: Generating 5 V or 12 V for PLC I/O modules, motor drivers, or HMI panels powered from 24 V industrial DC bus. IC Role / Device Role / Timing Role: Secondary-side post-regulator stepping down 24 V to logic-level voltages with minimal external components. Use Value: Wide 6–42 V input range accommodates brownouts and overvoltage conditions; WSON-10 package enables compact board area. |
| Telecom Remote Radio Unit (RRU) | Commercial HVAC Controller |
Use Scenario: Providing isolated 3.3 V supply for FPGA configuration and RF front-end bias in outdoor base station equipment. IC Role / Device Role / Timing Role: Efficient intermediate bus converter feeding downstream isolated DC-DC stages. Use Value: 1 MHz max switching frequency allows small inductors and ceramic output capacitors - critical for thermal management in sealed enclosures. | Use Scenario: Powering microcontroller, display, and relay drivers in wall-mounted thermostats or zone controllers connected to 24 VAC-to-DC power supplies. IC Role / Device Role / Timing Role: Main system regulator converting rectified 24 VDC to 3.3 V for digital subsystems. Use Value: No-loop-compensation design simplifies qualification for long-lifecycle building automation products; AEC-Q100 Grade 1 rating supports extended temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011MHX | Higher 2-A current limit; identical pinout and control architecture; same WSON-10 package. | Supports higher output current loads without redesign; shares same PCB footprint and feedback network. | Select when >1 A continuous output current is required and thermal margin is constrained. |
| TPS54240DGQR | 3.5–40 V input; 2-A output; current-mode control; requires external compensation; MSOP-10 package. | Offers tighter load regulation and better light-load efficiency but adds complexity with compensation network. | Prefer when precise line/load regulation or adjustable current limit is prioritized over simplicity and fast transient response. |
Compared with LM25011MHX, the LM25010MHX provides lower current capability but identical layout compatibility and faster transient response due to constant ON-time control; versus TPS54240DGQR, it trades off compensation flexibility for reduced component count and simplified design validation.
Availability
LM25010MHX is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V field bus systems, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM25010MHX 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 technologies, with leadership in high-reliability automotive and industrial power solutions.
The LM25010MHX belongs to TI's high-voltage buck regulator product line, designed specifically for cost-sensitive, high-input-voltage DC-DC conversion in automotive and industrial environments where simplicity, robustness, and thermal resilience are critical.
FAQ
What is the maximum input voltage the LM25010MHX can withstand continuously?
The LM25010MHX has a recommended operating input voltage range of 6 V to 42 V. Its absolute maximum rating for VIN to RTN is 45 V, but continuous operation above 42 V is not advised. Exceeding 42 V may trigger overvoltage protection or degrade reliability over time. For applications with potential load-dump transients (e.g., automotive), external clamping or filtering should be used to ensure VIN remains within specification during fault conditions. The LM25010MHX itself does not include integrated overvoltage clamp circuitry beyond its internal comparators.
Does the LM25010MHX require an external compensation network?
No, the LM25010MHX does not require an external compensation network. Its constant ON-time control architecture eliminates the need for traditional Type II or Type III compensation networks typically used in voltage-mode or current-mode buck regulators. This simplifies design, reduces component count, and improves load transient response - the regulator re-triggers each ON-pulse immediately when the FB voltage falls below 2.5 V. The LM25010MHX achieves stability inherently through its timing-based regulation scheme, as confirmed in TI's SNVS419E datasheet Section 7.3.1.
How is the switching frequency set on the LM25010MHX?
The switching frequency of the LM25010MHX is programmed using an external resistor (RON) connected between VIN and the RON/SD pin. The ON-time duration varies inversely with input voltage and is calculated as tON = [1.18 × 10−10 × (RON + 1.4 kΩ)] / (VIN − 1.4 V) + 67 ns. For continuous conduction mode, frequency is approximated by fS ≈ VOUT / [2 × L1 × 1.4 × 1020 / (RL × RON)]. Typical RON values range from 50 kΩ (≈1 MHz) to 500 kΩ (≈100 kHz), as shown in Figure 5 of the LM25010MHX datasheet.
Can the LM25010MHX be used with an external VCC supply?
Yes, the LM25010MHX supports an externally applied VCC supply between 7.5 V and 14 V, connected via a diode to the VCC pin. Doing so disables the internal bias regulator, reducing power dissipation when VIN exceeds 8.9 V. This is especially beneficial in high-input-voltage applications (e.g., 36–42 V) where internal VCC regulation would otherwise dissipate significant heat. The external supply must remain below VIN to prevent reverse current flow, as an internal diode connects VCC to VIN. TI recommends this configuration in Section 7.3.2 of the SNVS419E datasheet.
What is the purpose of the SGND and RTN pins on the LM25010MHX?
The LM25010MHX separates signal and power grounds via dedicated SGND (current sense ground) and RTN (regulator ground) pins. SGND carries the recirculating inductor current during the OFF-time and serves as the return path for the internal 130 mΩ current sense resistor - routing it separately minimizes noise coupling into the feedback loop. RTN is the ground reference for all other internal circuitry (bias regulator, comparators, logic). Proper PCB layout requires separate copper pours for SGND and RTN, joined only at a single point near the device's exposed thermal pad to maintain measurement accuracy and stability.
LM25010MHX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM25010MHX FAQ
1.How can I place an order for LM25010MHX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010MHX 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 LM25010MHX reliable?
The price and inventory of LM25010MHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010MHX is usually 5 days.
3.What payment methods are accepted for LM25010MHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010MHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010MHX?
LM25010MHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010MHX 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 LM25010MHX?
For technical support, including LM25010MHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010MHX requirements.
6.How does Aetrix verify that LM25010MHX is sourced from the original manufacturer or authorized distributors?
All LM25010MHX 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 LM25010MHX meets industry standards.
7.What is the process for return or replacement of LM25010MHX?
All LM25010MHX units undergo pre-shipment inspection (PSI). If there is an issue with LM25010MHX, 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 LM25010MHX part is unused and in its original packaging.
Return procedure for LM25010MHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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