LM5122QMHX/NOPB

FEATURES

• 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

APPLICATIONS

• 12 V, 24 V, and 48 V Power Systems

• Automotive Start-Stop

• Audio Power Supply

• High Current Boost Power Supply

DESCRIPTION

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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