LM3481-Q1 Series

2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified

Catalog

2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified

Part	Voltage - Input [Max]	Voltage - Input [Min]	Board Type	Supplied Contents	Main Purpose	Regulator Topology	Current - Output	Outputs and Type	Outputs and Type	Utilized IC / Part	Frequency - Switching	Voltage - Output	Output Phases	Mounting Type	Supplier Device Package	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Control Features	Output Type	Number of Outputs	Function	Package / Case	Package / Case [x]	Package / Case [x]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Qualification	Grade
Texas Instruments LM3481EVAL/NOPB	11 V	3 V	Fully Populated	Board(s)	DC/DC Step Up	Boost	1.5 A	Non-Isolated	1	LM3481	300 kHz	12 V
Texas Instruments LM3481MMX/NOPB													1	Surface Mount	10-VSSOP	Positive	125 ¯C	-40 °C	Boost Flyback SEPIC	1 MHz	100 kHz	Enable Frequency Control Ramp Soft Start	Transistor Driver	1	Step-Up Step-Up/Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	48 V	2.97 V
Texas Instruments LM3481MM/NOPB													1	Surface Mount	10-VSSOP	Positive	125 ¯C	-40 °C	Boost Flyback SEPIC	1 MHz	100 kHz	Enable Frequency Control Ramp Soft Start	Transistor Driver	1	Step-Up Step-Up/Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	48 V	2.97 V
Texas Instruments LM3481-FLYBACKEVM			Fully Populated	Board(s)	DC/DC Step Up	Flyback	2 A	Isolated	1	LM3481	130 kHz	12 V
Texas Instruments LM3481QMM/NOPB													1	Surface Mount	10-VSSOP	Positive	125 ¯C	-40 °C	Boost Flyback SEPIC	1 MHz	100 kHz	Enable Frequency Control Ramp Soft Start	Transistor Driver	1	Step-Up Step-Up/Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	48 V	2.97 V	AEC-Q100	Automotive
Texas Instruments LM3481SEPICEVAL/NOPB			Fully Populated	Board(s)	DC/DC Step Up or Down	Buck-Boost	1.25 A 3 A	Non-Isolated	1	LM3481	500 kHz	5 V 12 V

Catalog

2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified

Key Features

• AEC-Q100 Qualified for automotive applications:Device temperature grade 1: -40°C to +125°C, TA10-Lead VSSOP packageInternal push-pull driver with 1A peak current capabilityCurrent limit and thermal shutdownFrequency compensation optimized with a capacitor and a resistorInternal soft startCurrent mode operationAdjustable undervoltage lockout with hysteresisPulse skipping at light loadsKey specificationsWide supply voltage range of 2.97V to 48V100kHz to 1MHz Adjustable and synchronizable clock frequency±1.5% (over temperature) internal reference10µA shutdown current (over temperature)Create a custom design using the LM3481-Q1 with theWEBENCH Power DesignerAEC-Q100 Qualified for automotive applications:Device temperature grade 1: -40°C to +125°C, TA10-Lead VSSOP packageInternal push-pull driver with 1A peak current capabilityCurrent limit and thermal shutdownFrequency compensation optimized with a capacitor and a resistorInternal soft startCurrent mode operationAdjustable undervoltage lockout with hysteresisPulse skipping at light loadsKey specificationsWide supply voltage range of 2.97V to 48V100kHz to 1MHz Adjustable and synchronizable clock frequency±1.5% (over temperature) internal reference10µA shutdown current (over temperature)Create a custom design using the LM3481-Q1 with theWEBENCH Power Designer

Description

The LM3481-Q1 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in boost, SEPIC and flyback converters and topologies requiring a low-side FET as the primary switch. The LM3481-Q1 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481-Q1 device can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor. The LM3481-Q1 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor. The LM3481-Q1 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in boost, SEPIC and flyback converters and topologies requiring a low-side FET as the primary switch. The LM3481-Q1 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481-Q1 device can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor. The LM3481-Q1 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor.