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IC REG CTRLR MULT TOP 20HTSSOP
• Available in AEC-Q100 (LM5122-Q1)
• 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 Switching to 1 MHz
• Peak Current Mode Control
• Robust 3 A Integrated Gate Drivers
• Adaptive Dead-Time Control
• Optional Diode Emulation Mode
• Programmable Cycle-by-Cycle Current Limit
• Hiccup Mode Overload Protection
• 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
• Allows External VCC Supply
• Inductor DCR Current Sensing Capability
• Multiphase Capability
• Thermally Enhanced 20-Pin HTSSOP
• 12 V, 24 V, and 48 V Power Systems
• Automotive Start-Stop
• Audio Power Supply
• High Current Boost Power Supply
The LM5122 is a multiphase 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 feedforward, 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 180º 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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