1 Features

1• AEC-Q100 Qualified with the following results:

– Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

– Device HBM ESD Classification Level 2

– Device CDM ESD Classification Level C6

• Maximum Input Voltage: 65 V

• Minimum Input Voltage: 3 V (4.5 V for Start-Up)

• Output Voltage up to 100 V

• Bypass (VOUT = VIN) Operation

• 1.2-V Reference with ±1% Accuracy

• Free-Run and Synchronizable Switching to 1 MHz

• Peak-Current-Mode Control

• Robust 3-A Integrated Gate Drivers

• Adaptive Dead-Time Control

• Optional Diode-Emulation Mode

2 Applications • 12-V, 24-V, and 48-V Power Systems • Automotive Start-Stop • Audio Power Supply • High-Current Boost Power Supply 3 Description The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous 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 by two robust Nchannel MOSFET gate drivers with adaptive deadtime control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions. An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multiphase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.

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