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Texas Instruments LM25180NGUR
- Part No.:
- LM25180NGUR
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25180NGUR.pdf
- Description:
- IC REG FLYBACK 1.21V 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
LM25180NGUR from Texas Instruments is a primary-side regulated (PSR) flyback DC/DC controller IC with integrated 65-V, 1.5-A N-channel power MOSFET, supporting 4.5 V to 42 V input and delivering up to 7 W isolated output power at ±1.5% total regulation accuracy. It operates in boundary conduction mode (BCM), features 12–350 kHz variable switching frequency, and enables optocoupler-free design for industrial bias supplies.
For engineers reviewing the LM25180NGUR datasheet, LM25180NGUR pinout, LM25180NGUR application, or LM25180NGUR equivalent, key selection considerations include its PSR architecture eliminating third-winding feedback, thermal-compensated voltage regulation via TC pin, hiccup-mode overcurrent protection, and WSON-8 package with wettable flanks for automated optical inspection.
Technical Context
The LM25180NGUR implements variable-frequency peak current-mode (VFPCM) control with three operating modes: BCM at heavy loads (peak current limit 1.23–1.73 A), DCM at mid loads (clamped max frequency 350 kHz), and frequency foldback mode (FFM) at light loads (min frequency 12 kHz). Its PSR feedback samples reflected flyback voltage at zero secondary current, removing need for optocoupler or auxiliary winding.
Internal integration includes 0.4-Ω RDS(on) MOSFET, type-II loop compensation, programmable soft start (6 ms internal or capacitor-adjustable), and precision EN/UVLO with 1.45–1.53 V enable threshold and 50 mV hysteresis. Thermal shutdown activates at 175°C with 6°C hysteresis, and junction temperature range spans –40°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial rail inputs including 12 V, 24 V, and 36 V systems with operation down to 3.5 V after startup. |
| Output Power Capability | Up to 7 W - enabled by integrated 65-V/1.5-A MOSFET with 0.4-Ω RDS(on), providing headroom for line transients. |
| Regulation Accuracy | ±1.5% total - achieved via PSR sampling at zero secondary current and optional diode thermal compensation using TC pin. |
| Switching Frequency Range | 12 kHz to 350 kHz - dynamically adjusted across load to maintain BCM, DCM, or FFM for optimal efficiency and EMI. |
| Quiescent Current | 25–40 µA with external BIAS supply - reduces no-load input power consumption significantly versus active-mode 260–350 µA. |
| Protection Features | Hiccup-mode overcurrent, thermal shutdown (175°C), input UVLO with hysteresis, and soft-start limiting inrush - ensures robust field operation. |
| Package | 8-pin WSON (4.0 mm × 4.0 mm, 0.8 mm pitch) with wettable flanks - supports automated optical inspection and high thermal performance (RθJA = 41.3°C/W). |
Pinout & Package
LM25180NGUR is housed in an 8-pin thermally enhanced WSON package (NGU) with exposed die attach pad (DAP) connected to GND for improved heat dissipation. The package measures 4.0 mm × 4.0 mm with 0.8-mm pin pitch and wettable flanks for solder-joint quality verification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Internally connected to drain of 65-V/1.5-A MOSFET; connects to primary switching terminal of flyback transformer. |
| 2 - FB | Primary-side feedback input | Samples reflected flyback voltage; resistor from FB to SW sets output voltage ratio with RSET. |
| 3 - VIN | Power input | Supplies internal bias regulators and senses input voltage; requires low-impedance connection to input rail. |
| 4 - EN/UVLO | Enable and UVLO programming | Logic-controlled startup: <1.1 V = shutdown, 1.1–1.5 V = standby, >1.5 V = active; resistor divider enables precise UVLO threshold. |
| 5 - SS/BIAS | Soft-start timing or external bias input | Capacitor to GND sets soft-start time; external ≥5.5 V supply powers internal LDO for reduced quiescent current. |
| 6 - TC | Temperature compensation | Connects resistor to RSET to offset thermal drift of flyback diode forward voltage, improving output regulation over temperature. |
| 7 - RSET | Reference current setting | 12.1-kΩ resistor to GND sets 100 µA reference current and 1.21-V internal reference for FB regulation. |
| 8 - GND | Analog and power ground | Common return for control circuitry and MOSFET source; DAP must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler, voltage reference, and transformer auxiliary winding - reduces BOM count and improves reliability in isolated supplies. |
| Integrated 65-V/1.5-A MOSFET | Enables compact 7-W isolated designs without external switch; 0.4-Ω RDS(on) minimizes conduction loss at full load. |
| Thermal compensation (TC pin) | Corrects output voltage drift caused by temperature-dependent forward voltage of secondary diode - maintains ±1.5% regulation across –40°C to +150°C. |
| Three-mode variable-frequency control | BCM (high efficiency), DCM (stable light-load), and FFM (ultra-low IQ) - adapts switching behavior to load for best-in-class efficiency from 10% to 100% load. |
| Ultra-low EMI signature | Soft-switching avoids diode reverse recovery; optimized layout and quasi-resonant turn-off meet CISPR 32 Class B conducted/radiated limits. |
Applications
| Isolated Field Transmitters | IGBT/SiC Gate Drive Supplies |
|---|---|
Use Scenario: 4–20 mA loop-powered sensor in hazardous industrial environments requiring galvanic isolation and wide input voltage tolerance. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating stable 5 V or 15 V isolated bias from 12–36 V field bus. Use Value: Eliminates optocoupler and auxiliary winding - reduces component count, improves long-term reliability, and meets IEC 61000-4 immunity requirements. |
Use Scenario: High-side gate driver supply in motor drives where fast switching of IGBTs or SiC MOSFETs demands low-noise, tightly regulated isolated rails. IC Role / Device Role / Timing Role: PSR flyback controller delivering 15 V/–5 V dual outputs with fast transient response and minimal cross-talk between drive channels. Use Value: Integrated MOSFET and internal compensation reduce layout sensitivity; BCM operation ensures consistent timing margin across temperature and load. |
| Analog Input Module Bias Rails | Building Automation HVAC Controllers |
Use Scenario: Multi-channel analog input module requiring isolated ±15 V and +5 V rails for signal conditioning, ADC reference, and microcontroller power. IC Role / Device Role / Timing Role: Single-chip PSR flyback solution supporting multi-output transformer design with independent regulation per rail. Use Value: Programmable soft start prevents inrush into large output capacitance; TC pin compensates for diode drift in extended temperature ranges. |
Use Scenario: Smart thermostat or zone controller powered from 24 VAC HVAC distribution bus, needing isolated 3.3 V for MCU and 12 V for relays. IC Role / Device Role / Timing Role: Wide-input PSR controller enabling direct rectified AC operation with built-in UVLO hysteresis for brownout resilience. Use Value: 4.5–42 V input range accommodates rectified 24 VAC (≈34 Vpk) with margin; hiccup-mode fault protection prevents latch-up during relay coil back-EMF events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSR flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28911DR | Higher 700-V MOSFET rating; fixed 50-kHz frequency; no TC pin or external bias option. | Better suited for universal AC input (85–265 VAC); lacks thermal compensation and BIAS efficiency boost for DC-fed industrial use. | Select UCC28911DR only when AC input compatibility is required; LM25180NGUR preferred for DC-fed 12–42 V systems demanding tighter regulation and lower EMI. |
| LNK3206P | Integrated 725-V switch; constant-power regulation; no programmable UVLO or soft start. | Designed for low-cost AC/DC adapters; lacks precision enable, TC compensation, and WSON thermal performance. | LNK3206P offers lower BOM cost for non-critical consumer applications; LM25180NGUR provides superior accuracy, thermal management, and industrial-grade protection. |
Compared with UCC28911DR and LNK3206P, the LM25180NGUR delivers higher regulation accuracy (±1.5% vs. ±5%), lower no-load IQ with BIAS support, and dedicated thermal compensation - making it optimal for precision industrial isolated supplies where output stability and long-term reliability are critical.
Availability
LM25180NGUR is available at Aetrix Electronics and suitable for isolated field transmitters, motor drive gate supplies, analog input modules, and building automation controllers requiring stable component supply, long lifecycle support, and traceable sourcing.
Supply support for LM25180NGUR 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability power management solutions.
The LM25180NGUR belongs to TI's PSR flyback controller product line, designed specifically for compact, cost-effective, and highly reliable isolated DC/DC conversion in industrial automation, motor control, and process instrumentation.
FAQ
What is the maximum output power achievable with the LM25180NGUR?
The LM25180NGUR supports up to 7 W of isolated output power, enabled by its integrated 65-V, 1.5-A N-channel MOSFET with 0.4-Ω RDS(on). This rating assumes proper thermal management using the WSON-8 package's exposed DAP and appropriate PCB copper area. At 24 V input and 5 V output, typical full-load efficiency exceeds 85%, confirming sustainable 7-W operation under industrial ambient conditions.
Does the LM25180NGUR require an optocoupler for output voltage regulation?
No, the LM25180NGUR does not require an optocoupler. It uses primary-side regulation (PSR) by sampling the reflected flyback voltage at the SW pin during the demagnetization phase - precisely when secondary current reaches zero. This eliminates the need for optocouplers, TL431 references, or auxiliary transformer windings, reducing component count and improving system reliability.
How is output voltage set on the LM25180NGUR?
Output voltage on the LM25180NGUR is set using two resistors: a feedback resistor (RFB) from SW to FB, and RSET (12.1 kΩ) from RSET to GND. The output voltage follows VOUT = VREF × (1 + RFB/RSET), where VREF is the internal 1.21-V reference. For example, with RFB = 158 kΩ, VOUT = 5.0 V. An optional TC resistor further corrects for diode thermal drift.
What protection features are integrated into the LM25180NGUR?
The LM25180NGUR integrates hiccup-mode overcurrent protection, thermal shutdown at 175°C (with 6°C hysteresis), input undervoltage lockout with adjustable hysteresis, and internal soft-start to limit inrush current. These protections operate autonomously without external components, ensuring robust operation in harsh industrial environments where voltage transients and thermal stress are common.
Can the LM25180NGUR support multiple isolated outputs?
Yes, the LM25180NGUR supports multi-output isolated designs using a single transformer with multiple secondary windings. Each secondary uses its own rectifier and filter, while regulation is maintained on the main output via PSR. Auxiliary outputs track the main output within ±5% under typical conditions, and tighter regulation can be achieved using post-regulators or TC compensation on the main rail.
LM25180NGUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- -
- Frequency - Switching:
- 12kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-WSON (4x4)
LM25180NGUR FAQ
1.How can I place an order for LM25180NGUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25180NGUR 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 LM25180NGUR reliable?
The price and inventory of LM25180NGUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25180NGUR is usually 5 days.
3.What payment methods are accepted for LM25180NGUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25180NGUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25180NGUR?
LM25180NGUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25180NGUR 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 LM25180NGUR?
For technical support, including LM25180NGUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25180NGUR requirements.
6.How does Aetrix verify that LM25180NGUR is sourced from the original manufacturer or authorized distributors?
All LM25180NGUR 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 LM25180NGUR meets industry standards.
7.What is the process for return or replacement of LM25180NGUR?
All LM25180NGUR units undergo pre-shipment inspection (PSI). If there is an issue with LM25180NGUR, 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 LM25180NGUR part is unused and in its original packaging.
Return procedure for LM25180NGUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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