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Texas Instruments LM25005MHX/NOPB
- Part No.:
- LM25005MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25005MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,060
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Product details
Overview
LM25005MHX/NOPB from Texas Instruments is a 42V, 2.5A synchronous step-down DC/DC switching regulator with integrated 160mΩ N-channel MOSFET, current-mode control using emulated inductor current ramp, and programmable 50–500kHz oscillator. It operates from 7V to 42V input and delivers adjustable output down to 1.225V with ±1.5% reference accuracy-used in industrial point-of-load and telecom infrastructure power supplies.
For engineers reviewing the LM25005MHX/NOPB datasheet, LM25005MHX/NOPB pinout, LM25005MHX/NOPB application, or LM25005MHX/NOPB equivalent, key selection considerations include its HTSSOP-20 package with exposed thermal pad, cycle-by-cycle current limiting, thermal shutdown at 165°C, soft-start programmability, and SYNC capability for multi-regulator synchronization.
Technical Context
The LM25005MHX/NOPB implements peak current-mode control via an emulated ramp generated from VIN–VOUT and internal 25µA offset, eliminating noise-sensitive current sensing while enabling stable operation at very small duty cycles in high-input-voltage applications. Its dual-mode VCC bias regulator maintains ~7V output above 9V VIN and tracks VIN below that threshold.
Functional integration includes a 20-pin HTSSOP package with dedicated IS pins for diode current sampling, RAMP pin for external capacitor-based slope tuning, PRE pin for light-load bootstrap precharge, and bidirectional SYNC I/O supporting master-slave synchronization of up to five devices without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 42V - supports wide industrial and telecom bus voltages including 24V, 36V, and 48V nominal systems. |
| Output Current | 2.5A continuous - enables single-chip point-of-load regulation for FPGA, DSP, or ASIC core rails. |
| Feedback Reference | 1.225V ±1.5% - sets precise output voltage with external resistor divider; enables outputs as low as 1.225V. |
| Switch RDS(on) | 170–340mΩ (typical 160mΩ) - defines conduction loss and thermal rise under full load at 2.5A. |
| Oscillator Range | 50kHz to 500kHz - selectable via single RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Soft-Start Current | 7–14µA (typical 10µA) - controls ramp rate of error amplifier reference via external SS capacitor. |
Pinout & Package
The LM25005MHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.5mm × 4.4mm with an exposed die attach pad (EP) soldered to PCB ground for improved thermal dissipation (RθJC(bot) = 1.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 3,4) | Main input supply connection | Accepts 7–42V; powers internal bias regulator and high-side switch; requires local 0.1–1µF ceramic decoupling. |
| SW (pins 17,18) | Switching node | Drain of internal N-MOSFET; connects to inductor and external Schottky diode cathode; high dv/dt node requiring tight layout. |
| PGND (pins 13,14) | Power ground return | Low-side reference for IS sense resistor and PRE switch; must be routed separately from AGND to avoid noise coupling. |
| AGND (pin 10) | Analog ground reference | Reference for FB, COMP, RAMP, RT, and internal error amplifier; ties to clean analog ground plane. |
| FB (pin 7) | Feedback input | Connects to resistor divider from output; regulates output by comparing to 1.225V internal reference. |
| COMP (pin 6) | Error amplifier output | Provides access to EA output for external Type II compensation network between COMP and FB. |
| RAMP (pin 9) | Emulated current ramp input | External capacitor to AGND sets ramp slope; enables stable current-mode control without current-sense noise. |
| RT (pin 8) | Oscillator frequency set | Single resistor to AGND programs switching frequency from 50kHz to 500kHz per TI Equation 1. |
| SYNC (pin 5) | Oscillator sync I/O | Bidirectional pin allowing multiple LM25005MHX/NOPB units to synchronize or lock to external clock ≥ free-run frequency. |
| SD (pin 2) | Shutdown/standby control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; includes 5µA internal pull-up. |
| SS (pin 11) | Soft-start timing | 10µA internal current source charges external capacitor to ramp reference voltage and prevent inrush current. |
| IS (pins 15,16) | Diode current sense | Measures freewheeling diode anode current during off-time to generate DC level of emulated ramp. |
| BST (pin 20) | Bootstrap capacitor input | Connects to SW via 22nF ceramic capacitor; supplies gate drive voltage for high-side MOSFET during on-time. |
| PRE (pin 19) | Bootstrap precharge assist | Open-drain output pulsed 250ns before each on-time to aid BST capacitor charging under light load or pre-biased output. |
| VCC (pin 1) | Bias regulator output | 7V regulated output (tracks VIN ≤9V); powers internal circuitry and gate drivers; requires 0.1–1µF decoupling. |
| OUT (pin 12) | Regulated output connection | Direct connection to output capacitor; not a power output pin but signal node for feedback and loop stability. |
| EP | Exposed thermal pad | Must be soldered to solid PCB ground plane; primary path for heat removal (RθJB = 15.5°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates leading-edge current-sense spikes and propagation delay, enabling reliable sub-100ns minimum on-time at high VIN/VOUT ratios. |
| Programmable oscillator with SYNC | Single RT resistor sets frequency; SYNC pin allows deterministic phase alignment across multiple regulators without external clock generator. |
| Dual-mode VCC bias regulator | Tracks VIN below 9V and regulates to 7V above 9V-reducing internal power dissipation and enabling direct connection to 42V rail. |
| Integrated precharge (PRE) and bootstrap (BST) | PRE pin actively assists BST capacitor charging during light load or pre-biased startup, preventing gate drive collapse and improving reliability. |
| Diode current sensing (IS pins) | Measures freewheeling diode current near end of off-time to reconstruct accurate DC inductor current level for emulated ramp generation. |
| Three-level SD pin control | Supports hardware-controlled shutdown (<0.7V), low-power standby (0.7–1.225V), and full operation (>1.225V) with internal 5µA pull-up for default-enable behavior. |
Applications
| Industrial Point-of-Load Regulation | Telecom Power Distribution |
|---|---|
|
Use Scenario: Regulating 3.3V or 5V from a 24V or 48V backplane in PLC I/O modules or motor drive control boards. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, efficient DC/DC conversion with thermal and overcurrent protection. Use Value: Delivers 2.5A at high efficiency (>90% typical at 24V→5V/2A) while maintaining stable regulation under dynamic load transients common in factory automation. |
Use Scenario: Generating intermediate rails (e.g., 12V, 5V) from -48V telecom rectified bus in base station power management units. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating directly from rectified -48V (with polarity inversion) or +48V distribution bus. Use Value: 42V absolute max rating and 7–42V operating range allow robust operation despite line transients; SYNC enables synchronized switching to reduce EMI in dense telecom chassis. |
| Factory Automation Power Supply | High-Voltage Industrial Sensors |
|
Use Scenario: Powering microcontrollers, ADCs, and isolation interfaces in ruggedized field instruments powered from 24V or 36V industrial buses. IC Role / Device Role / Timing Role: Compact, thermally optimized DC/DC converter delivering clean, regulated output with soft-start and thermal shutdown. Use Value: HTSSOP-20 package with EP enables high power density on space-constrained PCBs; 165°C thermal shutdown prevents damage during ambient temperature excursions. |
Use Scenario: Supplying precision analog front-ends in high-voltage sensor nodes (e.g., current transformers, HV battery monitors) where input may reach 40V. IC Role / Device Role / Timing Role: Input-tolerant buck regulator generating low-noise 3.3V or 5V rail from unregulated HV source with minimal external components. Use Value: Integrated 42V MOSFET and 1.225V reference enable accurate low-voltage outputs even at extreme VIN/VOUT ratios; RAMP tuning optimizes loop stability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116MHX/NOPB | Wide-input (6–100V), external MOSFET driver; no integrated switch; supports higher current via discrete FETs. | Used where >2.5A output or >42V input is required; lacks integrated 160mΩ switch and emulated ramp. | Select LM5116MHX/NOPB when scaling beyond 2.5A or needing >42V input; LM25005MHX/NOPB is simpler for ≤2.5A, ≤42V designs. |
| TPS54240DGQR | 3.5–42V input, 2.5A integrated switch, current-mode control, but uses traditional current-sense resistor instead of emulated ramp. | Higher board area due to external sense resistor; more susceptible to noise at high VIN/VOUT; no SYNC or PRE features. | Choose TPS54240DGQR if cost sensitivity outweighs noise immunity and advanced features; LM25005MHX/NOPB offers superior transient response and layout simplicity. |
Compared with LM5116MHX/NOPB and TPS54240DGQR, the LM25005MHX/NOPB uniquely combines integrated 42V/2.5A switching, emulated current-mode control for noise immunity, and multi-device SYNC capability-making it optimal for compact, high-reliability industrial and telecom point-of-load designs where input voltage stays within 7–42V.
Availability
LM25005MHX/NOPB is available at Aetrix Electronics and suitable for industrial point-of-load regulation, telecom power distribution, and factory automation power supply applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM25005MHX/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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM25005MHX/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for robust, low-component-count buck conversion in industrial, telecom, and automotive subsystems operating from 7V to 42V rails.
FAQ
What is the maximum input voltage rating for the LM25005MHX/NOPB?
The LM25005MHX/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 7V to 42V. Exceeding 45V-even momentarily during transients-can cause permanent damage. Proper input filtering and layout practices are essential to suppress ringing on the VIN line, especially in 48V telecom or industrial applications where line surges occur.
Does the LM25005MHX/NOPB require an external current-sense resistor?
No, the LM25005MHX/NOPB does not require an external current-sense resistor. It uses an internal diode current sensing scheme via the IS pins and an emulated current ramp generated from VIN–VOUT and an external RAMP capacitor. This eliminates noise-prone shunt resistors and simplifies PCB layout while maintaining accurate cycle-by-cycle current limiting at 3.5A threshold.
How is the switching frequency set on the LM25005MHX/NOPB?
The switching frequency of the LM25005MHX/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using TI's Equation 1 (RT = 1/(F − 580×10⁻⁹)/135×10⁻¹²), designers select RT to achieve 50–500kHz operation. For example, RT = 32.4kΩ yields ~200kHz. The RT resistor must be placed close to the IC with short traces to minimize noise coupling into the oscillator.
Can multiple LM25005MHX/NOPB regulators be synchronized to reduce EMI?
Yes, the LM25005MHX/NOPB includes a bidirectional SYNC pin that allows up to five devices to synchronize their switching frequencies and phases. When SYNC pins are tied together, the device with the highest programmed frequency becomes the master and forces others to align-eliminating beat frequencies and lowering peak radiated emissions in multi-rail power systems such as telecom line cards or industrial controllers.
What thermal management provisions does the LM25005MHX/NOPB include?
The LM25005MHX/NOPB features an exposed thermal pad (EP) in its HTSSOP-20 package, which must be soldered to a large PCB ground plane to achieve RθJB = 15.5°C/W. Its junction-to-case (bottom) thermal resistance is only 1.2°C/W, making it highly dependent on proper pad layout. Thermal shutdown activates at 165°C with 25°C hysteresis, and the device includes internal thermal foldback to limit power dissipation during sustained overload.
LM25005MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 7V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM25005MHX/NOPB FAQ
1.How can I place an order for LM25005MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25005MHX/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 LM25005MHX/NOPB reliable?
The price and inventory of LM25005MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25005MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25005MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25005MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25005MHX/NOPB?
LM25005MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25005MHX/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 LM25005MHX/NOPB?
For technical support, including LM25005MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25005MHX/NOPB requirements.
6.How does Aetrix verify that LM25005MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25005MHX/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 LM25005MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25005MHX/NOPB?
All LM25005MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25005MHX/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 LM25005MHX/NOPB part is unused and in its original packaging.
Return procedure for LM25005MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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