LM5181-Q1 Series

Automotive 65-VIN no-opto flyback DC/DC converter with 100-V, 0.75-A integrated MOSFET

Catalog

Automotive 65-VIN no-opto flyback DC/DC converter with 100-V, 0.75-A integrated MOSFET

Part	Number of Outputs	Voltage - Input (Min) [Min]	Current - Output	Supplier Device Package	Frequency - Switching [Max]	Frequency - Switching [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Synchronous Rectifier	Function	Voltage - Input (Max) [Max]	Topology	Grade	Mounting Type	Output Type	Qualification	Voltage - Output (Min/Fixed)	Package / Case	Output Configuration	Output Type	Voltage - Output (Max) [Max]
Texas Instruments LM5181NGUR	1	4.5 V	500 mA	8-WSON (4x4)	350 kHz	12 kHz	150 °C	-40 °C		Step-Up/Step-Down	65 V	Flyback	Automotive	Surface Mount	1.81 mOhm	AEC-Q100	5 V	8-WDFN Exposed Pad	Positive
Texas Instruments LM5181QNGURQ1	1	4.5 V	750 mA	8-WSON (4x4)	350 kHz	12 kHz	150 °C	-40 °C		Step-Up/Step-Down	65 V	Flyback	Automotive	Surface Mount		AEC-Q100	0 V	8-WDFN Exposed Pad	Positive	Adjustable	100 V

Catalog

Automotive 65-VIN no-opto flyback DC/DC converter with 100-V, 0.75-A integrated MOSFET

Key Features

• AEC-Q100-qualified for automotive applicationsDevice temperature grade 1: –40°C to 125°C ambient temperature rangeFunctional Safety-CapableDocumentation available to aid functional safety system designDesigned for reliable and rugged applicationsWide input voltage range of 4.5 V to 65 V with operation down to 3.5 V after start-upRobust solution with only one component crossing the isolation barrier±1.5% total output regulation accuracyOptional VOUTtemperature compensation6-ms internal or programmable soft startInput UVLO and thermal shutdown protectionHiccup-mode overcurrent fault protection–40°C to +150°C junction temperature rangeIntegration reduces solution size and costIntegrated 100-V, 0.4-Ω power MOSFETNo opto-coupler or transformer auxiliary winding required for VOUTregulationInternal loop compensationHigh-efficiency PSR flyback operationQuasi-resonant MOSFET turn-off in BCMLow input quiescent currentExternal bias option for improved efficiencySingle- and multi-output implementationsCreate a custom regulator design usingWEBENCH®Power DesignerUltra-low conducted and radiated EMI signaturesSoft switching avoids diode reverse recoveryOptimized for CISPR 25 Class 5 requirementAEC-Q100-qualified for automotive applicationsDevice temperature grade 1: –40°C to 125°C ambient temperature rangeFunctional Safety-CapableDocumentation available to aid functional safety system designDesigned for reliable and rugged applicationsWide input voltage range of 4.5 V to 65 V with operation down to 3.5 V after start-upRobust solution with only one component crossing the isolation barrier±1.5% total output regulation accuracyOptional VOUTtemperature compensation6-ms internal or programmable soft startInput UVLO and thermal shutdown protectionHiccup-mode overcurrent fault protection–40°C to +150°C junction temperature rangeIntegration reduces solution size and costIntegrated 100-V, 0.4-Ω power MOSFETNo opto-coupler or transformer auxiliary winding required for VOUTregulationInternal loop compensationHigh-efficiency PSR flyback operationQuasi-resonant MOSFET turn-off in BCMLow input quiescent currentExternal bias option for improved efficiencySingle- and multi-output implementationsCreate a custom regulator design usingWEBENCH®Power DesignerUltra-low conducted and radiated EMI signaturesSoft switching avoids diode reverse recoveryOptimized for CISPR 25 Class 5 requirement

Description

The LM5181-Q1 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 65 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation. The high level of integration results in a simple, reliable and high-density design with only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100-V power MOSFET provides output power up to 4 W with enhanced headroom for line transients. The LM5181-Q1 converter is qualified to automotive AEC-Q100 grade 1 and is available in 8-pin WSON package with 0.8-mm pin pitch and wettable flanks. The LM5181-Q1 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft start, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. The LM5181-Q1 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 65 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation. The high level of integration results in a simple, reliable and high-density design with only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100-V power MOSFET provides output power up to 4 W with enhanced headroom for line transients. The LM5181-Q1 converter is qualified to automotive AEC-Q100 grade 1 and is available in 8-pin WSON package with 0.8-mm pin pitch and wettable flanks. The LM5181-Q1 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft start, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.