My Inquiry
My Account
Texas Instruments LM5180QNGURQ1
- Part No.:
- LM5180QNGURQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5180QNGURQ1.pdf
- Description:
- IC REG FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5180QNGURQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive 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 at ±1.5% total regulation accuracy. It operates in boundary conduction mode (BCM), achieves up to 90% efficiency at 1 A load with 5 V output, and eliminates optocoupler or auxiliary winding requirements for feedback.
For engineers reviewing the LM5180QNGURQ1 datasheet, LM5180QNGURQ1 pinout, LM5180QNGURQ1 application, or LM5180QNGURQ1 equivalent, key selection considerations include its PSR architecture for compact isolation, programmable UVLO via EN/UVLO pin, thermal-compensated voltage regulation using TC/RSET, internal 6-ms or external capacitor-programmable soft start, and hiccup-mode overcurrent protection for automotive body electronics and powertrain systems.
Technical Context
The LM5180QNGURQ1 implements variable-frequency peak current-mode control with three operating modes: BCM at heavy loads (up to 350 kHz), DCM at medium loads (clamped max frequency), and frequency foldback mode (FFM) at light loads (down to 12 kHz). Its PSR feedback samples reflected flyback voltage at secondary zero-current crossing, enabling precise regulation without secondary-side sensing components.
It integrates a 100-V/0.4-Ω MOSFET, internal 1.21-V reference trimmed by RSET (12.1 kΩ), temperature-compensated FB loop via TC pin, and precision enable comparator with 1.45 V rising threshold and 50 mV hysteresis. The SS/BIAS pin supports dual-function operation: soft-start timing control or external bias supply connection for reduced quiescent current (25–40 µA active with bias vs. 260–350 µA without).
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) and load-dump conditions. |
| Integrated MOSFET | 100-V, 1.5-A, 0.4-Ω RDS(on) - enables robust 7-W isolated output without external high-voltage switch; provides headroom for 65-V line surges. |
| Output Regulation Accuracy | ±1.5% total - achieved via primary-side sampling at zero-secondary-current point, eliminating optocoupler drift and aging effects. |
| Switching Frequency Range | 12 kHz to 350 kHz - dynamically adjusts across BCM/DCM/FFM modes to maintain regulation and optimize efficiency across full load range. |
| Soft Start | 6-ms internal or externally programmable - controlled by capacitor on SS/BIAS pin; prevents inrush current during startup into large output capacitance. |
| Thermal Protection | 175°C shutdown with 6°C hysteresis - ensures safe operation under overload or poor heatsinking; automatic recovery after cooldown. |
| Enable Threshold | 1.45 V rising with 50-mV hysteresis - allows precise, resistor-divider-programmable UVLO for system-level power sequencing. |
| Quiescent Current | 3 µA shutdown, 260–350 µA active, 25–40 µA with external bias - enables low-power standby modes critical for always-on automotive modules. |
Pinout & Package
LM5180QNGURQ1 is housed in an 8-pin WSON package (4.0 mm × 4.0 mm, 0.8-mm pin pitch) with wettable flanks for enhanced solder-joint inspection and reliability in automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Internal drain of 100-V MOSFET; connects directly to primary winding of flyback transformer; carries high dv/dt switching waveform. |
| 2 - FB | Primary-side feedback input | Samples reflected flyback voltage at zero-secondary-current crossing; ratio of FB-to-SW resistor and RSET sets output voltage. |
| 3 - VIN | Main input supply | Powers internal bias regulators and serves as input voltage sense point; requires low-impedance path to bulk input capacitor. |
| 4 - 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; hysteresis enables clean power sequencing. |
| 5 - SS/BIAS | Soft-start timing / external bias input | Capacitor-connected for adjustable soft start; voltage ≥5.5 V enables external bias mode, reducing IQ and improving light-load efficiency. |
| 6 - TC | Temperature compensation | Connects to RSET via resistor to offset thermal drift of flyback diode VF, improving output voltage stability over –40°C to +125°C ambient. |
| 7 - RSET | Reference current setting | 12.1-kΩ resistor to GND sets 100-µA reference current and 1.21-V internal reference; determines FB gain and output voltage scaling. |
| 8 - GND | Analog and power ground | Common return for control circuitry and MOSFET source; must be low-inductance, star-connected to minimize noise coupling into FB/TC paths. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler, TL431, and transformer auxiliary winding - reduces BOM count, improves long-term reliability, and shrinks solution size by >30%. |
| Boundary conduction mode (BCM) | Enables zero-current switching of secondary diode, minimizing reverse recovery losses and EMI; supports compact transformer design with high power density. |
| Integrated 100-V MOSFET | Provides 1.5-A peak current capability and 0.4-Ω RDS(on) at TJ = 25°C - delivers 7 W output with margin for 65-V transients and simplifies layout versus discrete FET solutions. |
| Programmable thermal compensation | TC pin + external resistor corrects for diode VF drift over temperature - maintains ±1.5% regulation across –40°C to +125°C ambient without secondary sensing. |
| Hiccup-mode overcurrent protection | Shuts down on sustained overload, then auto-restarts after cooldown - protects transformer, diode, and MOSFET during short-circuit or excessive load conditions. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical testing - meets automotive functional safety requirements for body electronics and powertrain subsystems. |
Applications
| Automotive Body Electronics | Isolated Bias Rails for IGBT Drivers |
|---|---|
|
Use Scenario: Powering door module ECUs, seat controllers, and lighting nodes requiring galvanically isolated 5-V or 12-V rails from 12-V battery. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing transformer energy transfer, zero-current detection, and adaptive frequency modulation. Use Value: Enables compact, cost-effective isolation without optocouplers - reduces component count, improves MTBF, and meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Generating isolated gate-drive supplies for traction inverters in HEV/EV motor drives, where primary-side sensing avoids secondary-side component placement near high-noise switching nodes. IC Role / Device Role / Timing Role: PSR controller regulating auxiliary 15-V bias rail with tight tolerance, using BCM switching to minimize diode stress and improve efficiency at partial load. Use Value: Delivers stable, low-noise bias voltage across wide input range (4.5–65 V) while maintaining <±1.5% regulation - critical for reliable IGBT turn-on/turn-off timing. |
| On-Board Charger Auxiliary Supply | Industrial PLC Isolated I/O Power |
|
Use Scenario: Providing isolated 3.3-V or 5-V logic supply for microcontrollers and communication interfaces inside automotive on-board chargers (OBCs), operating from high-voltage DC-link or 12-V auxiliary bus. IC Role / Device Role / Timing Role: Flyback controller implementing frequency foldback mode (FFM) at light loads to maintain regulation down to 0.5% full scale while minimizing standby power. Use Value: Achieves >85% efficiency at 100-mA load with external bias, extending OBC system runtime during vehicle sleep mode and meeting UNECE R100 emissions standards. |
Use Scenario: Powering isolated analog input/output channels in industrial programmable logic controllers (PLCs), where galvanic separation prevents ground-loop interference and enables multi-point sensor networks. IC Role / Device Role / Timing Role: PSR flyback IC delivering regulated 5-V or 24-V isolated output with programmable UVLO and thermal shutdown - ensuring fail-safe behavior in harsh factory environments. Use Value: Supports extended temperature operation (–40°C to +125°C ambient) and withstands 70-V transients - meets IEC 61000-4-5 surge immunity requirements for industrial automation. |
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, 700-V integrated MOSFET, no RSET/TC pins, fixed 1.2-V reference, lower IQ (150 µA active) | Targeted at universal AC-input offline SMPS; lacks automotive qualification and thermal compensation for diode VF drift | Prefer LM5180QNGURQ1 for automotive-grade PSR designs requiring ±1.5% regulation over temperature and AEC-Q100 compliance. |
| LM5023QDGSRQ1 | 65-V input, external MOSFET required, optocoupler-based secondary-side regulation, no PSR, higher BOM count | Used where tighter output tolerance (<±1%) or multi-output tracking is mandatory; not suitable for space-constrained layouts | Choose LM5180QNGURQ1 when board area, reliability, and simplified transformer design outweigh need for sub-1% regulation. |
Compared with UCC28911DR and LM5023QDGSRQ1, the LM5180QNGURQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated 100-V MOSFET, PSR architecture with TC compensation, and programmable UVLO - making it the optimal choice for compact, high-reliability automotive isolated power supplies.
Availability
LM5180QNGURQ1 is available at Aetrix Electronics and suitable for automotive body electronics, isolated bias rails for IGBT drivers, and on-board charger auxiliary supplies requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for LM5180QNGURQ1 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 deep expertise in automotive-grade IC design and manufacturing.
The LM5180QNGURQ1 belongs to TI's automotive-qualified PSR flyback controller product line, engineered specifically for compact, reliable, and EMI-compliant isolated DC/DC conversion in harsh automotive environments.
FAQ
What is the maximum output power supported by the LM5180QNGURQ1?
The LM5180QNGURQ1 supports up to 7 W of isolated output power when used with appropriate magnetics and layout. This is enabled by its integrated 100-V, 1.5-A MOSFET and optimized boundary conduction mode control. Actual delivered power depends on input voltage, output voltage, transformer design, and thermal management - for example, at VIN = 12 V and VOUT = 5 V, typical continuous output is 1.4 A (7 W), while at VIN = 48 V, it scales to ~150 mA due to duty cycle limitations. The LM5180QNGURQ1 datasheet specifies performance curves across 5-V, 12-V, and 24-V outputs.
How does the LM5180QNGURQ1 achieve primary-side regulation without an optocoupler?
The LM5180QNGURQ1 achieves primary-side regulation by sampling the reflected flyback voltage at the SW pin precisely when secondary current reaches zero - a point where diode forward-voltage drop is negligible. This sampled voltage is fed into the FB pin through a resistor divider, and compared against an internal 1.21-V reference set by the RSET resistor. The error amplifier then adjusts peak primary current to maintain regulation. Because this method eliminates reliance on secondary-side components, the LM5180QNGURQ1 removes optocouplers, TL431s, and auxiliary windings - reducing cost, size, and long-term drift.
Can the LM5180QNGURQ1 be used with an external bias supply, and what are the benefits?
Yes, the LM5180QNGURQ1 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. This reduces active quiescent current from 260–350 µA to 25–40 µA, significantly improving light-load efficiency. In automotive always-on applications like body control modules, this feature extends battery life and lowers thermal load. The external bias can come from a transformer auxiliary winding (as shown in Figure 22 of the LM5180QNGURQ1 datasheet) or a separate low-noise LDO - but must remain within 13-V absolute maximum rating.
What is the purpose of the TC pin on the LM5180QNGURQ1, and how is it configured?
The TC (Temperature Compensation) pin on the LM5180QNGURQ1 compensates for the negative temperature coefficient of the secondary flyback diode's forward voltage drop (VF). As temperature rises, VF decreases, causing output voltage to rise unless corrected. The LM5180QNGURQ1 applies a temperature-dependent current to the FB loop via a resistor between TC and RSET. Using Equation 9 from the LM5180QNGURQ1 datasheet, a typical 158-kΩ resistor (RTC) is selected based on the diode's measured VF drift. This correction maintains ±1.5% output regulation across –40°C to +125°C ambient - a key advantage over non-compensated PSR controllers.
Does the LM5180QNGURQ1 support programmable undervoltage lockout (UVLO), and how is it implemented?
Yes, the LM5180QNGURQ1 supports fully programmable UVLO via its EN/UVLO pin. A resistor divider (RUV1/RUV2) from VIN to GND sets the turn-on threshold, with Equation 10 specifying VIN(ON) = VUV-RISING × (1 + RUV1/RUV2) + IUV-HYST × RUV1. The device uses a precision 1.45-V comparator with 50-mV hysteresis, enabling accurate, repeatable startup and shutdown behavior across temperature. For example, with RUV1 = 1 MΩ and RUV2 = 100 kΩ, UVLO turns on at ~16.2 V and off at ~15.7 V - ideal for battery-powered automotive systems needing defined brownout recovery.
LM5180QNGURQ1 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
- Supplier Device Package:
- 8-WSON (4x4)
LM5180QNGURQ1 FAQ
1.How can I place an order for LM5180QNGURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5180QNGURQ1 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 LM5180QNGURQ1 reliable?
The price and inventory of LM5180QNGURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5180QNGURQ1 is usually 5 days.
3.What payment methods are accepted for LM5180QNGURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5180QNGURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5180QNGURQ1?
LM5180QNGURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5180QNGURQ1 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 LM5180QNGURQ1?
For technical support, including LM5180QNGURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5180QNGURQ1 requirements.
6.How does Aetrix verify that LM5180QNGURQ1 is sourced from the original manufacturer or authorized distributors?
All LM5180QNGURQ1 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 LM5180QNGURQ1 meets industry standards.
7.What is the process for return or replacement of LM5180QNGURQ1?
All LM5180QNGURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5180QNGURQ1, 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 LM5180QNGURQ1 part is unused and in its original packaging.
Return procedure for LM5180QNGURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5180QNGURQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
