LM25122QPWPTQ1 Description

For use in high-efficiency synchronous boost regulator applications, the LM25122 is a multiphase capable synchronous boost controller. Peak current mode control is the foundation of the control strategy. Inherent line feedforward, cycle-by-cycle current limiting, and simple loop compensation are all provided by current mode control.

Programmable switching frequencies range up to 600 kHz. Two strong Nchannel MOSFET gate drivers with adaptive deadtime control increase efficiency. For greater efficiency under light load situations, a user-selectable diode emulation mode also permits discontinuous mode operation.

LM25122QPWPTQ1 Features

• Maximum Input Voltage : 42 V

• Min Input Voltage : 3 V (4.5 V for startup)

• Output Voltage up to 50 V

• Bypass (VOUT = VIN) Operation

• 1.2 V Reference with ±1.0% Accuracy

• Free-Run and Synchronizable Switching to 600 kHz

• 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

LM25122QPWPTQ1 Applications

• 12-V, 24-V, and 48-V Power Systems

• Automotive Start-Stop

• Audio Power Supply

• High Current Boost Power Supply