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Texas Instruments LM5180QNGUTQ1
- Part No.:
- LM5180QNGUTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5180QNGUTQ1.pdf
- Description:
- IC REG FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:243
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Product details
Overview
LM5180QNGUTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive primary-side regulated (PSR) flyback DC/DC controller with integrated 100-V, 1.5-A N-channel MOSFET, 4.5–65 V input range, ±1.5% output regulation accuracy, and boundary conduction mode (BCM) operation - designed for isolated bias rails in automotive body electronics and powertrain systems.
For engineers reviewing the LM5180QNGUTQ1 datasheet, LM5180QNGUTQ1 pinout, LM5180QNGUTQ1 application, or LM5180QNGUTQ1 equivalent, key selection considerations include its single-component isolation barrier architecture, programmable soft-start (6 ms internal or external capacitor), thermal compensation for diode VF drift, hiccup-mode overcurrent protection, and WSON-8 wettable flanks package for automotive-grade reflow inspection.
Technical Context
The LM5180QNGUTQ1 implements variable-frequency peak current-mode (VFPCM) control with three operating modes: BCM at heavy loads (enabling compact magnetics and ±1.5% regulation), DCM at mid loads (clamped max frequency of 350 kHz), and frequency foldback mode (FFM) at light loads (min 12 kHz). It samples reflected flyback voltage at secondary zero-current crossing to eliminate optocoupler and auxiliary winding requirements.
Its integrated 100-V/0.4-Ω MOSFET supports up to 7 W output power; precision EN/UVLO (1.45–1.53 V enable threshold, 50 mV hysteresis) enables robust system sequencing; and TC pin-driven diode thermal compensation improves output voltage stability across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports wide automotive battery transients including cold-crank (down to 3.5 V post-startup). |
| Output Regulation Accuracy | ±1.5% total - achieved via PSR sampling at secondary zero-current crossing, eliminating optocoupler error sources. |
| Integrated Power Switch | 100-V, 1.5-A N-channel MOSFET with 0.4 Ω RDS(on) - enables compact 7-W isolated supply without external high-voltage switch. |
| Switching Frequency Range | 12 kHz to 350 kHz - dynamically adjusts across BCM/DCM/FFM modes to maximize efficiency from full to <0.5% load. |
| Soft Start | 6-ms internal or externally programmable - controlled by SS/BIAS pin capacitor; prevents input inrush and output overshoot. |
| Thermal Protection | 175°C shutdown with 6°C hysteresis - ensures safe operation under sustained overload or poor heatsinking in enclosed modules. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for automotive body electronics and powertrain subsystems. |
Pinout & Package
LM5180QNGUTQ1 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) in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Internally connected to MOSFET drain; connects to primary winding of flyback transformer - carries high dv/dt switching waveform. |
| 2 - FB | Primary-side feedback | Samples reflected flyback voltage at zero-secondary-current crossing; sets output regulation via resistor divider with RSET. |
| 3 - VIN | Input supply | Powers internal bias regulators and senses input voltage; requires low-impedance path to bulk input capacitor. |
| 4 - EN/UVLO | Enable & UVLO input | Three-state control: <1.1 V = shutdown, 1.1–1.5 V = standby, >1.5 V = active start-up; supports precision UVLO via resistor divider. |
| 5 - SS/BIAS | Soft-start / bias supply | Charges external capacitor for programmable soft-start; accepts ≥5.5 V external bias to reduce quiescent current and boost efficiency. |
| 6 - TC | Temperature compensation | Adjusts FB reference to counteract thermal drift of flyback diode forward voltage - improves output 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 & power ground | Common return for control circuitry and MOSFET source - must be low-inductance, star-connected to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler, TL431, and auxiliary winding - reduces BOM count, cost, and failure points in isolated supplies. |
| Boundary conduction mode (BCM) | Enables zero-current switching on secondary side - minimizes EMI and improves efficiency vs. fixed-frequency flyback. |
| Wettable flanks WSON-8 | Supports automated solder-joint inspection per IPC-A-610 - critical for automotive production traceability and reliability assurance. |
| Hiccup-mode overcurrent protection | Shuts down during sustained overload and auto-restarts after cooldown - protects transformer, diode, and MOSFET without latch-off. |
| External bias supply option | Reduces active IQ from 350 µA to 40 µA - extends efficiency >90% down to light loads in always-on automotive modules. |
Applications
| Automotive Body Electronics | Automotive Powertrain Systems |
|---|---|
Use Scenario: Isolated 5-V rail for door module microcontrollers, window lift drivers, and mirror position sensors in 12-V/24-V vehicle architectures. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller providing galvanically isolated, AEC-Q100-compliant 5-V/1.2-A output. Use Value: Enables single-chip isolation with ±1.5% regulation - eliminates optocoupler aging concerns and simplifies layout in space-constrained door modules. |
Use Scenario: Bias supply for IGBT gate drivers and MCU supervision circuits in hybrid electric vehicle (HEV) motor control inverters. IC Role / Device Role / Timing Role: High-voltage input (up to 65 V) PSR flyback controller delivering stable 12-V/0.5-A isolated rail from traction battery domains. Use Value: Withstands load dump transients up to 65 V and maintains regulation across –40°C to +125°C - critical for under-hood powertrain reliability. |
| Isolated CAN Transceiver Bias | Industrial PLC Input/Output Isolation |
Use Scenario: Dedicated 5-V isolated supply for automotive CAN FD transceivers requiring common-mode noise immunity and bus fault protection. IC Role / Device Role / Timing Role: PSR flyback controller generating clean, low-noise 5-V rail referenced to CAN bus ground - no optocoupler timing skew. Use Value: Achieves CISPR 25 Class 5 EMI compliance with quasi-resonant BCM switching - avoids filtering overhead in ECU-level CAN interfaces. |
Use Scenario: Field-side isolated 3.3-V/5-V power for analog input modules in industrial programmable logic controllers (PLCs) operating from 24-V DC rails. IC Role / Device Role / Timing Role: Compact, transformer-coupled DC/DC converter delivering reinforced isolation (≥3 kVRMS) without external feedback components. Use Value: Reduces solution size by 40% vs. optocoupler-based designs - accelerates certification for IEC 61000-4-x immunity and UL 61800-5-1 safety standards. |
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, no integrated MOSFET (external 650-V FET required), fixed 5-V output only, no TC pin. | Targeted at universal-input AC/DC adapters; lacks automotive qualification and thermal compensation for diode VF. | Choose UCC28911DR only for non-automotive, cost-sensitive AC/DC applications where external high-voltage FET is acceptable. |
| LM5021MMX/NOPB | Current-mode PWM controller (no PSR), requires optocoupler + TL431, 75-V max input, no integrated MOSFET. | Designed for higher-power (>15 W), transformer-feedback flyback topologies with tighter cross-regulation needs. | Choose LM5021MMX/NOPB when multi-output regulation or higher output power is required - not a drop-in replacement for LM5180QNGUTQ1. |
Compared with UCC28911DR and LM5021MMX/NOPB, LM5180QNGUTQ1 uniquely integrates a 100-V MOSFET, supports programmable output voltage via RSET/FB, includes diode thermal compensation (TC), and delivers AEC-Q100 Grade 1 qualification - making it the only direct solution for compact, high-reliability automotive isolated bias rails under 7 W.
Availability
LM5180QNGUTQ1 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 transient-voltage conditions.
Supply support for LM5180QNGUTQ1 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 ICs, with leadership in automotive, industrial, and high-reliability applications.
The LM5180-Q1 product line delivers AEC-Q100-qualified PSR flyback controllers optimized for compact, cost-effective, and robust isolated DC/DC conversion in automotive subsystems - addressing stringent EMI, thermal, and functional safety requirements.
FAQ
What is the maximum output power supported by the LM5180QNGUTQ1?
The LM5180QNGUTQ1 supports up to 7 W of isolated output power using its integrated 100-V, 1.5-A MOSFET. This limit is determined by thermal constraints and peak current capability under worst-case conditions (e.g., 65-V input, 125°C ambient). At 12-V input, typical output is 5 V/1.2 A; at 48-V input, it delivers 5 V/0.8 A while maintaining >85% efficiency. Derating is required above 100°C junction temperature.
Does the LM5180QNGUTQ1 require an optocoupler for feedback?
No, the LM5180QNGUTQ1 does not require an optocoupler. It implements primary-side regulation (PSR) by sampling the reflected flyback voltage at the precise moment secondary current reaches zero - enabling accurate ±1.5% output regulation without optocouplers, TL431 references, or auxiliary transformer windings.
How is output voltage set on the LM5180QNGUTQ1?
Output voltage is set by a resistor divider between SW and FB pins, scaled against the internal 1.21-V reference established by the 12.1-kΩ resistor from RSET to GND. For a 5-V output, a 158-kΩ resistor is used from FB to SW. Equation VOUT = 1.21 × (1 + RFB/RRSET) applies, where RRSET = 12.1 kΩ and RFB is the FB-to-SW resistor.
What protection features are built into the LM5180QNGUTQ1?
The LM5180QNGUTQ1 includes hiccup-mode overcurrent protection (triggered at 1.23–1.73 A peak primary current), thermal shutdown at 175°C with 6°C hysteresis, input undervoltage lockout (UVLO) with adjustable hysteresis, and internal soft-start to limit inrush current. All protections recover automatically without external intervention or latch-off behavior.
Can the LM5180QNGUTQ1 operate with an external bias supply?
Yes, the LM5180QNGUTQ1 supports external bias via the SS/BIAS pin. When voltage exceeds 5.5 V, the internal LDO regulator switches from VIN-derived bias to the external source - reducing active quiescent current from 350 µA to 40 µA and improving light-load efficiency. An auxiliary winding on the flyback transformer is a common implementation.
Is the LM5180QNGUTQ1 pin-compatible with other TI PSR controllers?
No, the LM5180QNGUTQ1 is not pin-compatible with other TI PSR controllers such as the LM5181 or UCC2891x series. Its 8-pin WSON package, pin functions (e.g., dedicated TC and SS/BIAS pins), and internal architecture are unique to the LM5180-Q1 family. Layout and schematic changes are required for substitution.
LM5180QNGUTQ1 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:
- 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)
LM5180QNGUTQ1 FAQ
1.How can I place an order for LM5180QNGUTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5180QNGUTQ1 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 LM5180QNGUTQ1 reliable?
The price and inventory of LM5180QNGUTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5180QNGUTQ1 is usually 5 days.
3.What payment methods are accepted for LM5180QNGUTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5180QNGUTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5180QNGUTQ1?
LM5180QNGUTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5180QNGUTQ1 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 LM5180QNGUTQ1?
For technical support, including LM5180QNGUTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5180QNGUTQ1 requirements.
6.How does Aetrix verify that LM5180QNGUTQ1 is sourced from the original manufacturer or authorized distributors?
All LM5180QNGUTQ1 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 LM5180QNGUTQ1 meets industry standards.
7.What is the process for return or replacement of LM5180QNGUTQ1?
All LM5180QNGUTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5180QNGUTQ1, 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 LM5180QNGUTQ1 part is unused and in its original packaging.
Return procedure for LM5180QNGUTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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