LM5121-Q1 Series

Automotive, 3-65-V wide VIN, current mode synchronous boost with disconnection switch control

Catalog

Automotive, 3-65-V wide VIN, current mode synchronous boost with disconnection switch control

Part	Output Type	Frequency - Switching [Max]	Number of Outputs	Duty Cycle (Max) [Max]	Output Configuration	Grade	Qualification	Package / Case	Package / Case [custom]	Package / Case	Control Features	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Topology	Supplier Device Package	Function	Output Phases	Voltage - Output	Outputs and Type	Outputs and Type	Frequency - Switching	Board Type	Utilized IC / Part	Regulator Topology	Current - Output	Main Purpose	Voltage - Input [Min]	Voltage - Input [Max]	Supplied Contents
Texas Instruments LM5121QMH/NOPB	Transistor Driver	1 MHz	1	100 %	Positive	Automotive	AEC-Q100	20-PowerTSSOP	4.4 mm	0.173 in	Frequency Control Soft Start	-40 °C	125 ¯C	Surface Mount	65 V	4.5 V	Boost	20-HTSSOP	Step-Up	1
Texas Instruments LM5121EVM																					12 V	Non-Isolated	1	250 kHz	Fully Populated	LM5121	Boost	2 A	DC/DC Step Up	3 V	12 V	Board(s)
Texas Instruments LM5121MHE/NOPB	Transistor Driver	1 MHz	1	100 %	Positive			20-PowerTSSOP	4.4 mm	0.173 in	Frequency Control Soft Start	-40 °C	125 ¯C	Surface Mount	65 V	4.5 V	Boost	20-HTSSOP	Step-Up	1
Texas Instruments LM5121MHX/NOPB	Transistor Driver	1 MHz	1	100 %	Positive			20-PowerTSSOP	4.4 mm	0.173 in	Frequency Control Soft Start	-40 °C	125 ¯C	Surface Mount	65 V	4.5 V	Boost	20-HTSSOP	Step-Up	1
Texas Instruments LM5121QMHE/NOPB	Transistor Driver	1 MHz	1	100 %	Positive	Automotive	AEC-Q100	20-PowerTSSOP	4.4 mm	0.173 in	Frequency Control Soft Start	-40 °C	125 ¯C	Surface Mount	65 V	4.5 V	Boost	20-HTSSOP	Step-Up	1
Texas Instruments LM5121MH/NOPB	Transistor Driver	1 MHz	1	100 %	Positive			20-PowerTSSOP	4.4 mm	0.173 in	Frequency Control Soft Start	-40 °C	125 ¯C	Surface Mount	65 V	4.5 V	Boost	20-HTSSOP	Step-Up	1

Catalog

Automotive, 3-65-V wide VIN, current mode synchronous boost with disconnection switch control

Key Features

• AEC-Q100 Qualified with the following results:Device Temperature Grade 1: –40°C to +125°CAmbient Operating Temperature RangeDevice HBM ESD Classification Level 2Device CDM ESD Classification Level C6Maximum Input Voltage: 65 VMin Input Voltage: 3.0 V (4.5 V for startup)Output Voltage Up to 100 VBypass (VOUT= VIN) Operation1.2-V Reference with ±1.0% AccuracyFree-Run/Synchronizable up to 1 MHzPeak Current Mode ControlRobust Integrated 3-A Gate DriversAdaptive Dead-Time ControlOptional Diode Emulation ModeProgrammable Cycle-by-Cycle Current LimitProgrammable Line UVLOProgrammable Soft-StartThermal Shutdown ProtectionLow Shutdown Quiescent Current: 9 µAProgrammable Slope CompensationProgrammable Skip Cycle Mode ReducesStandby PowerSupports External VCC Bias Supply OptionLoad Disconnection in Shutdown Mode (TrueShutdown)Inrush Current LimitingHiccup Mode Short Circuit/Overload ProtectionCircuit Breaker FunctionCapable of Input Transient SuppressionCapable of Reverse Battery ProtectionThermally Enhanced 20-Pin HTSSOPAEC-Q100 Qualified with the following results:Device Temperature Grade 1: –40°C to +125°CAmbient Operating Temperature RangeDevice HBM ESD Classification Level 2Device CDM ESD Classification Level C6Maximum Input Voltage: 65 VMin Input Voltage: 3.0 V (4.5 V for startup)Output Voltage Up to 100 VBypass (VOUT= VIN) Operation1.2-V Reference with ±1.0% AccuracyFree-Run/Synchronizable up to 1 MHzPeak Current Mode ControlRobust Integrated 3-A Gate DriversAdaptive Dead-Time ControlOptional Diode Emulation ModeProgrammable Cycle-by-Cycle Current LimitProgrammable Line UVLOProgrammable Soft-StartThermal Shutdown ProtectionLow Shutdown Quiescent Current: 9 µAProgrammable Slope CompensationProgrammable Skip Cycle Mode ReducesStandby PowerSupports External VCC Bias Supply OptionLoad Disconnection in Shutdown Mode (TrueShutdown)Inrush Current LimitingHiccup Mode Short Circuit/Overload ProtectionCircuit Breaker FunctionCapable of Input Transient SuppressionCapable of Reverse Battery ProtectionThermally Enhanced 20-Pin HTSSOP

Description

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control. An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout. The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control. An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.