●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.
● AEC-Q100 Qualified with the following results:
● Device Temperature Grade 1: 40°C to +125°C
●Ambient Operating Temperature Range
● Device HBM ESD Classification Level 2
● Device CDM ESD Classification Level C6
● Maximum Input Voltage: 65 V
● Min Input Voltage: 3.0 V (4.5 V for startup)
● Output Voltage Up to 100 V
● Bypass (VOUT = VIN) Operation
● 1.2-V Reference with ±1.0% Accuracy
● Free-Run/Synchronizable up to 1 MHz
● Peak Current Mode Control
● Robust Integrated 3-A Gate Drivers
● Adaptive Dead-Time Control
● Optional Diode Emulation Mode
● Programmable Cycle-by-Cycle Current Limit
● Programmable Line UVLO
● Programmable Soft-Start
● Thermal Shutdown Protection
● Low Shutdown Quiescent Current: 9 µA
● Programmable Slope Compensation
● Programmable Skip Cycle Mode Reduces
●Standby Power
● Supports External VCC Bias Supply Option
● Load Disconnection in Shutdown Mode (True
●Shutdown)
● Inrush Current Limiting
● Hiccup Mode Short Circuit/Overload Protection
● Circuit Breaker Function
● Capable of Input Transient Suppression
● Capable of Reverse Battery Protection
● Thermally Enhanced 20-Pin HTSSOP
