TI LM5119PSQX/NOPB

The LM5119 is a dual synchronous buck controller designed for step-down regulator applications powered by high-voltage or wide-range input supplies. The control method is based on current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation. Use of an emulated current ramp reduces the noise sensitivity of the PWM circuit, enabling reliable control of the very small duty cycles required in high input voltage applications. Switching frequency is programmable from 50kHz to 750kHz. The LM5119 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency under light-load conditions. Efficiency is further enhanced by an integrated high-voltage bias regulator with automatic switchover to an external bias supply. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and discontinuous mode current limiting, and adjustable line undervoltage lockout. The device is offered in a power-enhanced 32-pin leadless WQFN package with an exposed die-attach pad for improved thermal dissipation.

• Emulated peak current mode control
• Wide operating voltage range (5.5V to 65V)
• Easily configurable as dual output or interleaved single output
• Robust 3.3A peak gate drive
• Switching frequency programmable up to 750kHz
• Optional diode emulation mode
• Programmable output (0.8V reference voltage)
• 1.5% accurate reference voltage
• Programmable current limit
• Discontinuous mode overload protection
• Programmable soft-start
• Programmable line undervoltage lockout
• Automatic switchover to external bias supply
• Channel 2 enable logic input
• Thermal shutdown
• 32-pin WQFN package

• Industrial DC-DC motor drivers
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