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Texas Instruments LM5180NGUR
- Part No.:
- LM5180NGUR
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5180NGUR.pdf
- Description:
- IC REG FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:7,757
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Product details
Overview
LM5180NGUR from Texas Instruments is a primary-side regulated (PSR) flyback DC/DC controller IC with integrated 100-V, 1.5-A N-channel MOSFET, supporting 4.5 V to 65 V input and delivering up to 7 W isolated output power. It achieves ±1.5% total output regulation accuracy without optocoupler or auxiliary winding, operates in boundary conduction mode (BCM), and features hiccup-mode overcurrent protection for rugged industrial bias supplies.
For engineers reviewing the LM5180NGUR datasheet, LM5180NGUR pinout, LM5180NGUR application, or LM5180NGUR equivalent, key selection considerations include its 8-pin WSON package with wettable flanks, programmable soft start, temperature-compensated feedback, quasi-resonant switching for low EMI, and support for single- or multi-output isolated rails in motor drives and field transmitters.
Technical Context
The LM5180NGUR implements variable-frequency peak current-mode (VFPCM) control with three operating modes: boundary conduction mode (BCM) at heavy loads (12–350 kHz), discontinuous conduction mode (DCM) at mid loads (clamped at 350 kHz), and frequency foldback mode (FFM) at light loads (down to 12 kHz). Its PSR architecture samples reflected flyback voltage at zero-secondary-current instants to regulate output without secondary-side sensing components.
Internal integration includes a 100-V/0.4-Ω MOSFET, type-II loop compensation, precision 1.21-V RSET reference, and thermal compensation circuitry that adjusts FB setpoint using TC pin to offset diode forward-voltage drift. The EN/UVLO pin provides 1.45–1.53 V enable threshold with 50-mV hysteresis and supports programmable UVLO via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports wide industrial input rails including 12 V, 24 V, 36 V, 48 V, and 65 V systems with operation down to 3.5 V after startup. |
| Output Power Capability | Up to 7 W - enabled by integrated 100-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 and optional diode thermal compensation, eliminating need for optocoupler or TL431. |
| Switching Frequency Range | 12 kHz to 350 kHz - dynamically adjusted across BCM/DCM/FFM modes to maintain efficiency and regulation across full load range. |
| Quiescent Current | 260–350 µA active, 3 µA shutdown - enables low-power standby in always-on industrial systems. |
| Operating Junction Temp | –40°C to +150°C - qualified for harsh environments including motor drives and HVAC controls. |
| Package | 8-pin WSON (4.0 mm × 4.0 mm, 0.8-mm pitch) with wettable flanks - supports automated optical inspection and high thermal reliability (RθJA = 41.3°C/W). |
Pinout & Package
The LM5180NGUR is housed in an 8-pin thermally enhanced WSON package (NGU) with exposed die attach pad (DAP) connected to PCB ground plane for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Internally connected to drain of 100-V MOSFET; connects to primary winding of flyback transformer - carries high dv/dt switching waveform. |
| 2 - FB | Primary-side feedback input | Senses reflected flyback voltage; ratio of FB-to-SW resistor and RSET sets output voltage - enables optocoupler-free regulation. |
| 3 - VIN | Power input | Supplies internal bias regulators and senses input voltage; must connect with short, low-impedance path to bulk input capacitor. |
| 4 - EN/UVLO | Enable and UVLO programming | 1.45–1.53 V enable threshold with 50-mV hysteresis; supports programmable UVLO via resistor divider or direct VIN tie. |
| 5 - SS/BIAS | Soft-start or external bias input | Connect capacitor for programmable soft start (default 6 ms); or supply external 5.5–13 V bias to reduce quiescent current to 25–40 µA. |
| 6 - TC | Temperature compensation | Adjusts FB reference to compensate for thermal drift of flyback diode VF; improves output regulation stability over temperature. |
| 7 - RSET | Reference current setting | 12.1-kΩ resistor to GND sets 100-µA reference current and 1.21-V internal reference - defines output voltage scaling. |
| 8 - GND | Analog and power ground | Common return for control circuitry and MOSFET source; DAP must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-V, 1.5-A MOSFET | Eliminates external high-voltage switch, reduces BOM count, and simplifies layout for isolated flyback designs. |
| Primary-side regulation (PSR) | Removes optocoupler, TL431, and auxiliary winding - cuts solution size, cost, and failure points while maintaining ±1.5% regulation. |
| Quasi-resonant MOSFET turn-off in BCM | Reduces switching losses and EMI by turning off at valley of drain voltage - optimized for CISPR 32 compliance. |
| Hiccup-mode overcurrent protection | Shuts down on sustained overload and auto-restarts after cooldown - protects transformer, MOSFET, and output capacitors. |
| Programmable soft start & external bias option | 6-ms internal ramp or external capacitor adjustment prevents inrush; external bias lowers IQ to 25 µA for higher efficiency at light loads. |
Applications
| Isolated Field Transmitters | Motor Drive Gate Supplies |
|---|---|
Use Scenario: 4–20 mA loop-powered sensor in hazardous industrial zones requiring galvanic isolation and wide input voltage tolerance. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating stable 5 V or 12 V isolated bias for signal conditioning and ADC front-end. Use Value: ±1.5% regulation accuracy ensures precise analog measurement; 4.5–65 V input range accommodates brownout and surge conditions without derating. | Use Scenario: IGBT or SiC gate driver power supply in variable-frequency drives where compact, reliable isolation is critical. IC Role / Device Role / Timing Role: Isolated bias generator delivering clean, low-noise 15 V/–5 V rails for gate drivers with fast transient response. Use Value: Quasi-resonant switching minimizes EMI coupling into sensitive gate signals; hiccup-mode protection prevents latch-up during shoot-through faults. |
| Building Automation HVAC | Multi-Output Analog Input Modules |
Use Scenario: Central HVAC controller board needing multiple isolated rails (e.g., 5 V, 12 V, 24 V) from a single 24 V or 48 V bus. IC Role / Device Role / Timing Role: Single-chip PSR flyback controller supporting multi-output transformer design with cross-regulation management. Use Value: Internal loop compensation and BCM operation deliver better than ±1.5% cross-regulation across outputs without post-regulators. | Use Scenario: PLC analog input module requiring isolated ±15 V, 5 V, and 3.3 V rails for op-amps, ADCs, and microcontrollers. IC Role / Device Role / Timing Role: Compact isolated DC/DC converter enabling dense channel-count modules with minimal footprint and thermal overhead. Use Value: 8-pin WSON package with wettable flanks allows automated AOI and high-density placement; –40°C to +150°C rating supports extended temperature operation. |
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 | 65-V max input, integrated 700-V MOSFET, fixed 50-kHz frequency, no external soft start or TC pin. | Targeted at universal AC-input offline converters; lacks programmable UVLO and thermal compensation for precision DC-DC. | Choose UCC28911DR only for AC/DC applications with >100 V input; LM5180NGUR preferred for wide-range DC inputs requiring tight regulation. |
| LM5021MMX/NOPB | Requires external high-voltage MOSFET, no PSR - needs optocoupler and TL431, higher component count and larger footprint. | Legacy controller for cost-sensitive designs where isolation barrier complexity is acceptable. | LM5180NGUR reduces bill-of-materials and improves reliability; LM5021MMX/NOPB only if existing optocoupler-based design must be reused. |
Compared with UCC28911DR and LM5021MMX/NOPB, the LM5180NGUR delivers superior regulation accuracy (±1.5% vs. ±3–5%), eliminates optocoupler dependency, integrates thermal compensation for stable output over temperature, and supports flexible soft start and UVLO programming - making it optimal for precision DC-fed isolated bias supplies.
Availability
LM5180NGUR is available at Aetrix Electronics and suitable for isolated field transmitters, motor drive gate supplies, and building automation HVAC systems requiring stable component supply, long-term manufacturability, and automotive-grade thermal resilience.
Supply support for LM5180NGUR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.
The LM5180NGUR belongs to TI's high-voltage PSR flyback controller product line, designed specifically for rugged, compact, and cost-effective isolated DC/DC conversion in factory automation, motor control, and process instrumentation.
FAQ
What is the maximum output power supported by the LM5180NGUR?
The LM5180NGUR supports up to 7 W of isolated output power. This capability is enabled by its integrated 100-V, 1.5-A N-channel MOSFET with 0.4-Ω RDS(on), which provides sufficient headroom for line transients and thermal margin in industrial environments. Output power depends on transformer design, input voltage, and cooling; typical 5-V output designs achieve full 7 W at 24 V input with proper layout and heatsinking. The LM5180NGUR datasheet specifies this limit under recommended operating conditions with junction temperature maintained ≤125°C.
Does the LM5180NGUR require an optocoupler for output voltage regulation?
No, the LM5180NGUR does not require an optocoupler. It uses primary-side regulation (PSR) by sampling the reflected flyback voltage at the SW pin during zero-current detection on the secondary side. This eliminates the need for optocouplers, TL431 references, or auxiliary windings - reducing component count, cost, and potential failure points. The LM5180NGUR achieves ±1.5% total output regulation accuracy through this method, with optional TC pin compensation further improving thermal stability.
How is the output voltage set on the LM5180NGUR?
The output voltage of the LM5180NGUR is set using two resistors: a feedback resistor (RFB) from FB to SW, and the RSET resistor (12.1 kΩ to GND). The ratio RFB/RSET determines the output voltage per Equation 8 in the datasheet. For example, with RSET = 12.1 kΩ and VOUT = 5 V, RFB ≈ 158 kΩ. An optional TC resistor between TC and RSET compensates for diode forward-voltage drift, improving regulation accuracy across temperature - a feature unique to the LM5180NGUR among PSR controllers.
What protection features are built into the LM5180NGUR?
The LM5180NGUR includes input UVLO with adjustable hysteresis, hiccup-mode overcurrent protection, and thermal shutdown with 6°C hysteresis. During overcurrent events, the device enters hiccup mode - shutting down, waiting for recovery, then attempting restart - preventing thermal runaway and component damage. Thermal shutdown activates at 175°C junction temperature and automatically recovers once temperature drops below 169°C. These protections are fully integrated and require no external components, enhancing system robustness in demanding applications like motor drives and field transmitters.
Can the LM5180NGUR operate with input voltages below 4.5 V?
The LM5180NGUR has a specified minimum input voltage of 4.5 V for normal operation, but it can sustain operation down to 3.5 V after startup. Below 4.5 V, functionality is not guaranteed across temperature and load - parameters such as regulation accuracy, switching frequency stability, and current limit may degrade. The 3.5-V dropout is intended for brief brownout conditions, not continuous operation. For designs requiring sub-4.5-V operation, the LM5180NGUR should be evaluated with worst-case testing; TI does not characterize or guarantee performance below 4.5 V in the LM5180NGUR datasheet.
LM5180NGUR 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 and Negative
- Topology:
- Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 10kHz ~ 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)
LM5180NGUR FAQ
1.How can I place an order for LM5180NGUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5180NGUR 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 LM5180NGUR reliable?
The price and inventory of LM5180NGUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5180NGUR is usually 5 days.
3.What payment methods are accepted for LM5180NGUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5180NGUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5180NGUR?
LM5180NGUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5180NGUR 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 LM5180NGUR?
For technical support, including LM5180NGUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5180NGUR requirements.
6.How does Aetrix verify that LM5180NGUR is sourced from the original manufacturer or authorized distributors?
All LM5180NGUR 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 LM5180NGUR meets industry standards.
7.What is the process for return or replacement of LM5180NGUR?
All LM5180NGUR units undergo pre-shipment inspection (PSI). If there is an issue with LM5180NGUR, 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 LM5180NGUR part is unused and in its original packaging.
Return procedure for LM5180NGUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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