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Texas Instruments LM25180QNGURQ1
- Part No.:
- LM25180QNGURQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25180QNGURQ1.pdf
- Description:
- IC REG FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:12,089
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Product details
Overview
LM25180QNGURQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive primary-side regulated (PSR) flyback DC/DC controller with integrated 65-V, 0.4-Ω MOSFET, 4.5–42 V input range, ±1.5% output regulation accuracy, and boundary conduction mode (BCM) operation for isolated 5-V bias rails in automotive body electronics.
For engineers reviewing the LM25180QNGURQ1 datasheet, LM25180QNGURQ1 pinout, LM25180QNGURQ1 application, or LM25180QNGURQ1 equivalent, key selection criteria include its PSR architecture eliminating optocouplers, 1.5-A peak current limit, 12–350 kHz variable switching frequency, thermal shutdown at 175°C, and WSON-8 wettable flanks package for automotive-grade solder joint inspection.
Technical Context
The LM25180QNGURQ1 implements variable-frequency peak current-mode control with three operating modes: BCM at heavy loads (enabling compact magnetics), DCM at medium loads (clamped at 350 kHz max), and frequency foldback mode (FFM) at light loads (down to 12 kHz). Its PSR feedback samples reflected flyback voltage at secondary zero-current crossing, removing need for optocoupler or auxiliary winding.
It integrates a 65-V/1.5-A N-channel MOSFET with 0.4-Ω RDS(on), precision enable/UVLO with 1.5-V rising threshold and 50-mV hysteresis, programmable soft-start via SS/BIAS pin, and temperature-compensated diode forward-voltage correction using TC/RSET resistor network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports automotive battery transients including cold-crank (down to 3.5 V post-startup) |
| Output Regulation Accuracy | ±1.5% - includes line, load, and temperature variation; enables stable 5-V bias without post-regulation |
| Integrated MOSFET | 65-V, 1.5-A, 0.4-Ω - delivers up to 7 W output power with headroom for 42-V line surges |
| Switching Frequency Range | 12 kHz to 350 kHz - auto-adjusts across BCM/DCM/FFM modes to maximize efficiency from full to light load |
| Peak Current Limit | 1.23 A to 1.73 A - trimmed and temperature-compensated; ensures consistent overload protection |
| Thermal Shutdown | 175°C with 6°C hysteresis - protects silicon during sustained overloads or poor PCB thermal design |
| Soft-Start Time | 6 ms internal or externally programmable - controls inrush current into large output capacitors |
Pinout & Package
LM25180QNGURQ1 is housed in an 8-pin WSON package (4.0 mm × 4.0 mm, 0.8-mm pitch) with wettable flanks for automated optical inspection (AOI) of solder joints in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drain of internal 65-V MOSFET; connects directly to primary winding of flyback transformer |
| FB | Primary-side feedback input | Senses reflected flyback voltage; resistor from FB to SW sets output voltage ratio with RSET |
| VIN | Power input | Bias supply source and input voltage sensing node; requires low-impedance path to bulk capacitor |
| EN/UVLO | Enable and UVLO programming | Three-state control: <1.1 V = shutdown, 1.1–1.5 V = standby, >1.5 V = active start-up |
| SS/BIAS | Soft-start timing or external bias input | Connect capacitor for adjustable soft-start; apply ≥5.5 V for external bias to reduce quiescent current |
| TC | Temperature compensation | Connects to RSET to offset thermal drift of flyback diode VF, improving output stability over –40°C to 125°C |
| RSET | Reference current setting | 12.1-kΩ resistor to GND sets 100-µA reference current and 1.21-V internal reference |
| GND | Analog and power ground | Common return for control circuitry and MOSFET source; must be low-inductance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements |
| Primary-side regulation (PSR) | Eliminates optocoupler, TL431, and transformer auxiliary winding - reduces BOM count and improves long-term reliability |
| Hiccup-mode overcurrent protection | Auto-restarts after fault clearance - prevents thermal runaway during sustained short-circuit conditions |
| Low EMI quasi-resonant switching | Meets CISPR 25 Class 5 radiated emissions - simplifies automotive EMC compliance without added filtering |
| Wettable flanks WSON package | Enables automated X-ray and AOI inspection of solder joints - critical for zero-defect automotive manufacturing |
Applications
| Automotive Body Electronics | Automotive Powertrain Systems |
|---|---|
Use Scenario: Isolated 5-V supply for door module microcontrollers and LIN transceivers in 12-V battery systems. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller providing galvanically isolated bias rail with no optocoupler. Use Value: Reduces solution size by 30% vs. optocoupler-based designs while maintaining ±1.5% regulation across –40°C to 125°C. | Use Scenario: Auxiliary 12-V isolated rail for IGBT gate drivers in hybrid electric vehicle (HEV) motor inverters. IC Role / Device Role / Timing Role: High-voltage PSR flyback controller delivering robust bias under 42-V battery transients. Use Value: Withstands load-dump events up to 45 V and maintains regulation during cold-crank down to 3.5 V post-startup. |
| Isolated Bias Power Rails | Industrial PLC I/O Modules |
Use Scenario: Single-component isolated 5-V/1-A supply for RS-485 transceivers in factory automation equipment. IC Role / Device Role / Timing Role: Integrated PSR flyback IC replacing discrete controller + MOSFET + optocoupler solution. Use Value: Achieves >85% efficiency at 1-A load with VIN = 24 V, reducing thermal stress in sealed enclosures. | Use Scenario: Galvanically isolated 3.3-V logic supply for analog input channel isolators in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Automotive-qualified PSR controller adapted for industrial environments requiring high reliability. Use Value: Leverages AEC-Q100 thermal robustness (–40°C to +150°C junction) for extended field life in uncooled cabinets. |
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 MOSFET, 1.2-A peak current, fixed 132-kHz frequency, no TC pin, non-automotive grade | Lacks AEC-Q100 qualification and temperature compensation; suited for cost-sensitive industrial use only | Select when automotive qualification and diode thermal drift correction are not required |
| LM5020MMX/NOPB | External MOSFET controller, no integrated switch, 100-V startup, requires optocoupler feedback | Higher system complexity and component count; used where >7-W output or higher input voltage is needed | Select when output power exceeds 7 W or input exceeds 42 V, and isolation integrity demands optocoupler feedback |
Compared with UCC28911DR and LM5020MMX/NOPB, LM25180QNGURQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated 65-V MOSFET, PSR architecture, and diode thermal compensation - making it the only single-chip solution qualified for automotive body and powertrain isolated bias rails.
Availability
LM25180QNGURQ1 is available at Aetrix Electronics and suitable for automotive body electronics, powertrain systems, and isolated bias power rails requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM25180QNGURQ1 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 broad automotive and industrial design-in support.
The LM25180-Q1 product line delivers highly integrated, AEC-Q100-qualified PSR flyback controllers targeting compact, reliable, and low-EMI isolated power supplies for automotive ECUs and industrial control modules.
FAQ
What is the maximum output power supported by the LM25180QNGURQ1?
The LM25180QNGURQ1 supports up to 7 W of isolated output power using its integrated 65-V, 0.4-Ω MOSFET. This is achievable with proper transformer design, thermal layout, and input conditions (e.g., VIN = 12–24 V, VOUT = 5 V). Derating is required at higher ambient temperatures or with limited PCB copper area, as specified in the thermal metrics (RΘJA = 41.3°C/W).
Does the LM25180QNGURQ1 require an optocoupler for feedback?
No, the LM25180QNGURQ1 does not require an optocoupler. It uses primary-side regulation (PSR) to sample the reflected flyback voltage at the SW node during secondary zero-current detection. This eliminates the need for optocouplers, TL431 references, or auxiliary transformer windings - reducing component count, cost, and long-term reliability risks.
How is output voltage set on the LM25180QNGURQ1?
The output voltage of the LM25180QNGURQ1 is set by a resistor divider between SW and FB pins, referenced to the internal 1.21-V bandgap at RSET. With a standard 12.1-kΩ RSET-to-GND resistor, the FB-to-SW resistor value determines VOUT per Equation 8 in the datasheet. For example, a 158-kΩ resistor yields ~5 V output. Optional TC pin compensation further improves accuracy over temperature.
What protection features are built into the LM25180QNGURQ1?
The LM25180QNGURQ1 includes hiccup-mode overcurrent protection, thermal shutdown at 175°C (with 6°C hysteresis), input UVLO with programmable hysteresis, and internal MOSFET overvoltage clamp (70 V SW rating). These features ensure safe operation during line transients, short circuits, and thermal overload - critical for automotive deployment where failure modes must be contained.
Can the LM25180QNGURQ1 operate with an external bias supply?
Yes, the LM25180QNGURQ1 supports external bias via the SS/BIAS pin. When voltage at SS/BIAS exceeds 5.5 V, the internal LDO switches to external sourcing, reducing active quiescent current from 260–350 µA to 25–40 µA. This improves light-load efficiency and is commonly implemented using a transformer auxiliary winding, as shown in Figure 22 of the datasheet.
LM25180QNGURQ1 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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-WSON (4x4)
LM25180QNGURQ1 FAQ
1.How can I place an order for LM25180QNGURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25180QNGURQ1 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 LM25180QNGURQ1 reliable?
The price and inventory of LM25180QNGURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25180QNGURQ1 is usually 5 days.
3.What payment methods are accepted for LM25180QNGURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25180QNGURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25180QNGURQ1?
LM25180QNGURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25180QNGURQ1 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 LM25180QNGURQ1?
For technical support, including LM25180QNGURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25180QNGURQ1 requirements.
6.How does Aetrix verify that LM25180QNGURQ1 is sourced from the original manufacturer or authorized distributors?
All LM25180QNGURQ1 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 LM25180QNGURQ1 meets industry standards.
7.What is the process for return or replacement of LM25180QNGURQ1?
All LM25180QNGURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM25180QNGURQ1, 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 LM25180QNGURQ1 part is unused and in its original packaging.
Return procedure for LM25180QNGURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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