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Texas Instruments LM25184QNGURQ1
- Part No.:
- LM25184QNGURQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25184QNGURQ1.pdf
- Description:
- IC REG FLYBACK 12V 4.1A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,020
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Product details
Overview
LM25184QNGURQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive primary-side regulated (PSR) flyback DC/DC controller with integrated 65-V, 4.1-A MOSFET, ±1.5% output regulation accuracy, 4.5–42-V input range, and boundary conduction mode (BCM) operation - used in IGBT/SiC driver supplies for traction inverters.
For engineers reviewing the LM25184QNGURQ1 datasheet, LM25184QNGURQ1 pinout, LM25184QNGURQ1 application, or LM25184QNGURQ1 equivalent, key selection criteria include PSR isolation architecture, thermal compensation capability (TC pin), programmable UVLO hysteresis, soft-start configurability, and CISPR 25 Class 5 EMI compliance for HEV/EV powertrain systems.
Technical Context
The LM25184QNGURQ1 implements variable-frequency peak current-mode (VFPCM) 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). It samples reflected flyback voltage on the primary side to eliminate optocouplers or auxiliary windings.
Its integrated 65-V/0.11-Ω MOSFET supports up to 15 W output power with 4.1-A peak current limit and 140-ns minimum on-time blanking. The TC pin enables diode forward-voltage temperature coefficient compensation, while EN/UVLO provides precision 1.45-V enable threshold with 50-mV hysteresis and hard shutdown below 0.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports full automotive battery range including cold-crank (3.5 V post-start) |
| Output Regulation Accuracy | ±1.5% - includes line, load, and temperature variation; enables stable 12-V rail for gate drivers |
| Integrated MOSFET | 65-V, 4.1-A, 0.11-Ω RDS(on) - eliminates external high-side switch; reduces BOM count and layout complexity |
| Switching Frequency Range | 12 kHz to 350 kHz - adaptive BCM/DCM/FFM operation optimizes efficiency across 0.5%–100% load |
| Junction Temperature Range | –40°C to +150°C - meets AEC-Q100 Grade 1 ambient (–40°C to +125°C) with 25°C margin |
| EMI Performance | CISPR 25 Class 5 compliant - soft switching avoids diode reverse recovery; no snubber required |
| Feedback Architecture | Primary-side regulation (PSR) - no optocoupler or auxiliary winding needed; single-component isolation barrier |
Pinout & Package
LM25184QNGURQ1 is housed in an 8-pin WSON package (NGU variant) with 4.0 mm × 4.0 mm body size, 0.8-mm pin pitch, and wettable flanks for automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Internally connected to drain of integrated 65-V MOSFET; connects to primary winding of flyback transformer |
| FB | Primary-side feedback input | Samples reflected flyback voltage; resistor divider (FB–SW / RSET–GND) sets output voltage without secondary sensing |
| VIN | Power input | Bias supply and input voltage sense; requires low-impedance path to input capacitor |
| EN/UVLO | Enable & UVLO programming | 1.45-V rising threshold with 50-mV hysteresis; supports resistor-divider UVLO tuning and system sequencing |
| SS/BIAS | Soft-start timing / external bias input | 5-µA internal charge current for 6-ms default soft-start; accepts external 4.25–13-V bias to reduce quiescent current |
| TC | Temperature compensation | Adjusts FB reference to offset thermal drift of flyback diode VF; improves output regulation over –40°C to +150°C |
| RSET | Reference current setting | 12.1-kΩ to GND sets 1.21-V internal reference; stabilizes regulation against input voltage and temperature variation |
| GND | Analog & power ground | Common return for control circuitry and MOSFET source; must be low-inductance connection to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| PSR flyback topology | Eliminates optocoupler and auxiliary winding - reduces solution size by >30% and improves long-term reliability in automotive environments |
| Thermal compensation (TC pin) | Enables <1% output voltage drift over temperature when paired with appropriate resistor network - critical for stable gate-driver bias rails |
| Quasi-resonant MOSFET turnoff | Reduces EMI and switching losses by avoiding hard-switching transitions - meets CISPR 25 Class 5 without added filtering |
| Hiccup-mode overload protection | Enters 9-kHz restart mode during sustained overcurrent or short-circuit - prevents thermal runaway while maintaining fault visibility |
| Wettable flank WSON package | Supports automated solder-joint inspection per IPC-A-610 - ensures manufacturing traceability for safety-critical automotive applications |
Applications
| Automotive Traction Inverter Driver Supply | HEV/EV On-Board Charger Auxiliary Rail |
|---|---|
Use Scenario: Powers isolated gate drivers for IGBTs or SiC MOSFETs in high-voltage traction inverters, where compact, robust, and EMI-clean isolated bias is mandatory. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller providing 12-V/1-A isolated output with ±1.5% regulation and thermal compensation for gate-drive stability. Use Value: Enables single-component isolation barrier and eliminates optocoupler aging concerns - extends system lifetime in 15-year automotive powertrain deployments. | Use Scenario: Generates auxiliary 5-V or 12-V rail for microcontrollers, sensors, and communication interfaces inside OBC enclosures exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-density PSR flyback controller supporting 4.5–42-V input and delivering up to 15 W with AEC-Q100 Grade 1 qualification. Use Value: Reduces bill-of-materials count and PCB area vs. secondary-side regulated solutions - accelerates OBC design cycle and lowers production cost. |
| Sub-AM Band Body Electronics | Automotive ADAS Camera Power Module |
Use Scenario: Supplies isolated 3.3-V or 5-V rails for LIN/CAN transceivers, door modules, and seat control ECUs operating in harsh under-hood or chassis locations. IC Role / Device Role / Timing Role: Automotive-grade flyback controller with programmable UVLO hysteresis and hiccup-mode fault response for unregulated 12-V battery inputs. Use Value: Maintains regulation during cold-crank (down to 3.5 V post-start) and load-dump transients - ensures uninterrupted module operation per ISO 16750-2. | Use Scenario: Provides clean, isolated 5-V power to image sensors and ISP processors in front/rear-view cameras subject to vibration, thermal cycling, and EMI from nearby motors. IC Role / Device Role / Timing Role: Low-noise PSR flyback IC with soft-switching and CISPR 25 Class 5 compliance - minimizes interference with high-speed MIPI CSI-2 video links. Use Value: Achieves >85% efficiency at 500-mA load with no external EMI filters - simplifies camera module mechanical design and thermal management. |
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, 365-kHz max fSW, no TC pin, non-AEC-Q100 | Industrial AC/DC adapters; lacks automotive qualification and thermal compensation | Select for cost-sensitive industrial supplies where AEC-Q100 and diode tempco compensation are not required |
| LM5180QNGURQ1 | 65-V MOSFET, 1-MHz max fSW, secondary-side regulation option, larger 10-pin WSON | Higher-power (>25 W) automotive isolated rails requiring tighter regulation or multi-output flexibility | Select when >15 W output or dual-rail generation is needed; adds optocoupler complexity but improves cross-regulation |
Compared with UCC28911DR and LM5180QNGURQ1, LM25184QNGURQ1 uniquely balances automotive qualification, PSR simplicity, thermal compensation, and CISPR 25 Class 5 compliance in a compact 8-pin WSON - making it optimal for 5–15 W isolated gate-driver and sensor-supply applications where reliability and EMI robustness are non-negotiable.
Availability
LM25184QNGURQ1 is available at Aetrix Electronics and suitable for automotive traction inverters, HEV/EV on-board chargers, and sub-AM band body electronics requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM25184QNGURQ1 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 leadership in automotive-grade IC design and manufacturing.
The LM25184QNGURQ1 belongs to TI's automotive PSR flyback controller product line, engineered specifically for isolated DC/DC conversion in HEV/EV powertrain systems where compact size, functional safety readiness, and EMI resilience are essential.
FAQ
What is the maximum output power supported by the LM25184QNGURQ1?
The LM25184QNGURQ1 supports up to 15 W of output power using its integrated 65-V, 4.1-A MOSFET. This rating assumes typical conditions: 12-V output, 24-V input, and proper thermal management per the 2.7°C/W junction-to-case (bottom) thermal resistance. Derating is required at higher ambient temperatures or with reduced airflow, as specified in the thermal characteristics table of the LM25184QNGURQ1 datasheet.
Does the LM25184QNGURQ1 require an optocoupler for feedback?
No, the LM25184QNGURQ1 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 architecture eliminates both the optocoupler and auxiliary transformer winding, reducing component count, board space, and long-term reliability risks associated with optocoupler aging - a key advantage of the LM25184QNGURQ1 in automotive applications.
How is output voltage set on the LM25184QNGURQ1?
The output voltage of the LM25184QNGURQ1 is set using two resistors: one (RFB) between SW and FB pins, and another (RRSET = 12.1 kΩ) between RSET and GND. The ratio RFB/RRSET determines the output based on the internal 1.21-V reference. An optional resistor from TC to RSET compensates for the temperature coefficient of the flyback diode's forward voltage - a unique capability of the LM25184QNGURQ1 that improves regulation accuracy across temperature.
What protection features are integrated into the LM25184QNGURQ1?
The LM25184QNGURQ1 integrates hiccup-mode overload protection, thermal shutdown with 10°C hysteresis (triggering at 175°C), input undervoltage lockout with programmable hysteresis, and MOSFET overcurrent limiting (4.1-A peak). During sustained overload, it enters a low-frequency restart mode (~9 kHz) rather than latching off - enabling automatic recovery once the fault clears. These protections are fully implemented within the IC and require no external components, enhancing system robustness in automotive environments where the LM25184QNGURQ1 is deployed.
Is the LM25184QNGURQ1 pin-compatible with other TI PSR controllers like the LM5180QNGURQ1?
No, the LM25184QNGURQ1 is not pin-compatible with the LM5180QNGURQ1. While both are AEC-Q100 automotive PSR flyback controllers with integrated MOSFETs, the LM25184QNGURQ1 uses an 8-pin WSON (NGU) package with specific pin assignments (e.g., TC, RSET), whereas the LM5180QNGURQ1 uses a 10-pin WSON package and includes additional pins for secondary-side regulation and higher-frequency operation. Board redesign is required to substitute either device - confirming that LM25184QNGURQ1 has no drop-in replacement within TI's portfolio.
LM25184QNGURQ1 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 4.1A
- 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)
LM25184QNGURQ1 FAQ
1.How can I place an order for LM25184QNGURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25184QNGURQ1 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 LM25184QNGURQ1 reliable?
The price and inventory of LM25184QNGURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25184QNGURQ1 is usually 5 days.
3.What payment methods are accepted for LM25184QNGURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25184QNGURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25184QNGURQ1?
LM25184QNGURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25184QNGURQ1 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 LM25184QNGURQ1?
For technical support, including LM25184QNGURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25184QNGURQ1 requirements.
6.How does Aetrix verify that LM25184QNGURQ1 is sourced from the original manufacturer or authorized distributors?
All LM25184QNGURQ1 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 LM25184QNGURQ1 meets industry standards.
7.What is the process for return or replacement of LM25184QNGURQ1?
All LM25184QNGURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM25184QNGURQ1, 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 LM25184QNGURQ1 part is unused and in its original packaging.
Return procedure for LM25184QNGURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM25184QNGURQ1 Tags
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