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Texas Instruments LM25010Q0MHX/NOPB
- Part No.:
- LM25010Q0MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25010Q0MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,043
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Product details
Overview
LM25010Q0MHX/NOPB from Texas Instruments is a 42-V, 1-A automotive-grade step-down switching regulator with integrated N-channel buck switch, constant ON-time control, valley current limiting at 1.25 A, and programmable switching frequency up to 1 MHz. It operates across 6 V–42 V input, delivers adjustable output voltage via FB pin (2.5 V ±2% reference), and targets secondary-side post-regulation in automotive electronics.
For engineers reviewing the LM25010Q0MHX/NOPB datasheet, LM25010Q0MHX/NOPB pinout, LM25010Q0MHX/NOPB application, or LM25010Q0MHX/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 0 qualification (–40°C to 150°C), no-loop-compensation architecture for ultra-fast transient response, integrated high-voltage bias regulator, and thermally enhanced 10-pin WSON package with exposed pad.
Technical Context
The LM25010Q0MHX/NOPB implements a constant ON-time regulation scheme where tON varies inversely with VIN to maintain nearly constant operating frequency across line and load variations. Its valley current limit detection (1.25 A typical) operates during SW OFF-time by sensing recirculating current through the internal sense resistor between ISEN and SGND.
Control relies on a 2.5-V feedback comparator and an overvoltage comparator (2.9 V threshold) that terminates ON-time immediately upon FB overvoltage. Startup uses an internal 11.5-µA soft-start current source charging the SS capacitor to 2.5 V, while thermal shutdown activates at 175°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide automotive battery and industrial DC bus inputs without external pre-regulation |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power systems |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and low-profile output filtering |
| Feedback Reference | 2.5 V ±2% - sets precise output voltage via external resistor divider (VOUT = 2.5 × (R1+R2)/R2) |
| Valley Current Limit | 1.25 A typical - protects against overload and short-circuit with cycle-by-cycle valley detection |
| Junction Temp Range | –40°C to 150°C - meets AEC-Q100 Grade 0 requirements for under-hood automotive applications |
| RDS(ON) | 0.35 Ω typical (TJ ≤125°C) - minimizes conduction loss in integrated N-channel buck switch |
Pinout & Package
LM25010Q0MHX/NOPB is housed in a thermally enhanced 10-pin WSON package (4.00 mm × 4.00 mm) with exposed metal pad for PCB ground connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internal N-channel MOSFET source - connects to inductor, freewheeling diode, and bootstrap capacitor |
| BST | Bootstrap supply | Charges external BST–SW capacitor from VCC via internal diode during OFF-time to drive high-side gate |
| VIN | Main input supply | Accepts 6–42 V DC - powers internal bias regulator and buck switch; bypass capacitors required at VIN–RTN |
| VCC | Bias regulator output | Self-generated 7 V (for VIN > 8.9 V) or tracks VIN (for VIN < 8.9 V); 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 RTN to avoid noise coupling into current sense |
| RTN | Power ground return | Ground return for all internal circuitry except current sense path - connects to system ground plane |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5 V reference; also feeds overvoltage comparator (2.9 V) |
| SS | Soft-start control | Internal 11.5-µA current source charges external capacitor to ramp reference and limit inrush current |
| RON/SD | ON-time programming / shutdown | Resistor from VIN sets tON; grounding disables 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 design iteration time |
| 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 - accepts 6–42 V input and self-generates stable VCC |
| Programmable soft start | External SS capacitor sets startup ramp time - prevents output overshoot and limits inrush into bulk capacitance |
| AEC-Q100 Grade 0 qualified | Validated for –40°C to +150°C ambient operation - suitable for engine control units and transmission modules |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | Industrial 24-V Rail Post-Regulator |
|---|---|
Use Scenario: Supplies regulated 3.3 V or 5 V to MCU, CAN transceiver, and analog sensors in under-hood ECU modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1 A at up to 150°C junction temperature with fast load transients from injector drivers. Use Value: AEC-Q100 Grade 0 rating and 42-V input withstand capability eliminate need for upstream protection in stop-start battery systems. | Use Scenario: Steps down 24-V factory automation rail to 12 V or 5 V for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller replacing discrete MOSFET solutions with integrated switch and driver. Use Value: Valley current limiting and thermal shutdown ensure robust operation during motor stall or short-circuit events on shared 24-V bus. |
| Telecom Remote Radio Unit (RRU) Bias Supply | Commercial Vehicle Infotainment System Core Rail |
Use Scenario: Generates stable 1.2 V or 1.8 V core voltage for FPGAs and DSPs in outdoor wireless base stations. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter operating from -48 V telecom rectified input (via intermediate 12 V stage). Use Value: 1-MHz programmable frequency allows small inductors and ceramic output caps - critical for space-constrained RRU enclosures. | Use Scenario: Powers display controller, audio codec, and USB hub in head-unit systems with wide-input 9–16 V vehicle battery. IC Role / Device Role / Timing Role: Main DC-DC regulator handling cold-crank (6 V) and load-dump (42 V) transients without reset or dropout. Use Value: Integrated 7-V bias regulator and VIN-referenced ON-time control maintain stable frequency and regulation across full automotive voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011Q0MHX/NOPB | Higher 2-A current rating; identical pinout and control architecture; shares same WSON-10 package | Supports higher-power loads (e.g., multi-core processors) without layout change | Select when output current exceeds 1 A but thermal budget and footprint must remain unchanged |
| TPS54160DGQR | Wider 3.5–60 V input; lower 1.5-A rating; different constant-frequency PWM control; HTSSOP-10 package | Lacks AEC-Q100 qualification; suited for industrial, not automotive, environments | Choose for non-automotive 60-V input applications where loop compensation is acceptable |
Compared with LM25010Q0MHX/NOPB, LM25011Q0MHX/NOPB offers direct upgrade path for higher current without redesign, while TPS54160DGQR provides broader input range at the cost of automotive qualification and constant-frequency operation.
Availability
LM25010Q0MHX/NOPB is available at Aetrix Electronics and suitable for automotive ECUs, industrial 24-V post-regulators, and telecom RRU bias supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM25010Q0MHX/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 and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.
The LM25010 product line delivers high-voltage, current-mode buck regulators optimized for rugged, high-reliability applications where input transients, thermal stress, and long-term stability are critical - especially in automotive power distribution and industrial control systems.
FAQ
What is the maximum allowable input voltage for LM25010Q0MHX/NOPB?
The absolute maximum VIN to RTN rating for LM25010Q0MHX/NOPB is 45 V, but the recommended operating range is 6 V to 42 V per the datasheet. Operation above 42 V risks exceeding safe operating area limits and may trigger overvoltage protection or cause permanent damage. The device is specifically designed for automotive battery systems including load-dump conditions up to 42 V.
Does LM25010Q0MHX/NOPB require external compensation components?
No, LM25010Q0MHX/NOPB does not require external compensation components. Its constant ON-time control architecture eliminates the need for traditional Type II or Type III compensation networks. Stability is inherent in the control loop, enabling simplified design, reduced BOM count, and ultra-fast transient response without tuning.
How is the switching frequency set on LM25010Q0MHX/NOPB?
The switching frequency of LM25010Q0MHX/NOPB is set by an external resistor (RON) connected between VIN and the RON/SD pin. The ON-time varies inversely with VIN, resulting in nearly constant frequency across line and load. For example, with RON = 200 kΩ and VIN = 24 V, typical fSW is ~400 kHz. Equation 7 in the datasheet provides exact calculation: RON = (VOUT × (VIN − 1.4 V)) / (VIN × fSW × 1.18×10⁻¹⁰) − 1.4 kΩ.
What is the purpose of the SGND pin on LM25010Q0MHX/NOPB?
The SGND pin on LM25010Q0MHX/NOPB serves as the dedicated return path for current sensed at the ISEN pin during the buck switch OFF-time. It isolates high-di/dt current-sense return from the main power ground (RTN) to prevent noise coupling into the valley current limit comparator - ensuring accurate 1.25-A current limiting independent of PCB layout parasitics.
Can LM25010Q0MHX/NOPB operate in discontinuous conduction mode (DCM)?
Yes, LM25010Q0MHX/NOPB automatically transitions into discontinuous conduction mode (DCM) at light loads. In DCM, inductor current falls to zero during part of the OFF-time, reducing switching losses and maintaining high efficiency at low output power. The device maintains regulation in both continuous (CCM) and discontinuous modes, with frequency decreasing in DCM as load current drops.
LM25010Q0MHX/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):
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM25010Q0MHX/NOPB FAQ
1.How can I place an order for LM25010Q0MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25010Q0MHX/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 LM25010Q0MHX/NOPB reliable?
The price and inventory of LM25010Q0MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25010Q0MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25010Q0MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25010Q0MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25010Q0MHX/NOPB?
LM25010Q0MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25010Q0MHX/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 LM25010Q0MHX/NOPB?
For technical support, including LM25010Q0MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25010Q0MHX/NOPB requirements.
6.How does Aetrix verify that LM25010Q0MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25010Q0MHX/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 LM25010Q0MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25010Q0MHX/NOPB?
All LM25010Q0MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25010Q0MHX/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 LM25010Q0MHX/NOPB part is unused and in its original packaging.
Return procedure for LM25010Q0MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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