All trademarks are the property of their respective owners.
DescriptionThe LM5119PSQ/NOPB 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. TheLM5119PSQ/NOPB device drives external high-side and low-side NMOS power switches withadaptive dead-time control. A user-selectable diode emulation mode enables discontinuous modeoperation for improved efficiency at light load conditions. A high voltage bias regulator withautomatic switch-over to external bias further improves efficiency. Additional features includethermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit andadjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pinWQFN package featuring an exposed die attach pad to aid thermal dissipation.
Feature
- Emulated Peak Current Mode Control
- Wide Operating Range (5.5 V to 65V)
- Easily Configurable for Dual Outputs or Interleaved Single Output
- Robust 3.3-A Peak Gate Drive
- Switching FrequencyProgrammable to 750 kHz
- Optional Diode EmulationMode
- Programmable Output from 0.8 V
- Precision 1.5% VoltageReference
- Programmable Current Limit
- Hiccup Mode OverloadProtection
- Programmable Soft-Start
- Programmable LineUndervoltage Lockout
- Automatic Switch-Over to External BiasSupply
- Channel2 Enable Logic Input
- ThermalShutdown
- Leadless 32-Pin WQFN Package
All trademarks are the property of their respective owners.
DescriptionThe LM5119 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. TheLM5119 device drives external high-side and low-side NMOS power switches withadaptive dead-time control. A user-selectable diode emulation mode enables discontinuous modeoperation for improved efficiency at light load conditions. A high voltage bias regulator withautomatic switch-over to external bias further improves efficiency. Additional features includethermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit andadjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pinWQFN package featuring an exposed die attach pad to aid thermal dissipation.
