• Emulated Peak Current Mode Control

• Wide OperatingRange (4.5 V to 42 V)

• Easily Configurable for Dual Outputsor Interleaved Single Output

• Robust 3.3-A Peak GateDrive

• Switching Frequency Programmable to 750 kHz

• OptionalDiode Emulation Mode

• Programmable Output From 0.8V

• Precision 1.5% Voltage Reference

• Programmable CurrentLimit

• Hiccup Mode Overload Protection

• ProgrammableSoft-Start

• Programmable Line Undervoltage Lockout

• AutomaticSwitchover to External Bias Supply

• Channel2 Enable LogicInput

• Thermal Shutdown

• Leadless 32-Pin WQFNPackage

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The LM25119 device is a dual synchronous buck controller intendedfor step-down regulator applications from a high voltage or widely varying input supply. Thecontrol method is based upon current mode control using an emulated current ramp. Current modecontrol provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loopcompensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-widthmodulation circuit, allowing reliable control of very small duty cycles necessary in high inputvoltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. TheLM25119 device drives external high-side and low-side N-channel MOS powerswitches with adaptive dead-time control. A user-selectable diode emulation mode enablesdiscontinuous mode operation for improved efficiency at light load conditions. A high voltage biasregulator with automatic switch-over to external bias further improves efficiency. Additionalfeatures include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup modecurrent limit and adjustable line undervoltage lockout. The device is available in a power enhancedleadless 32-pin WQFN package featuring an exposed die attach pad to aid thermaldissipation.