What is LM5119PSQX/NOPB Dual Synchronous Buck Controller?

LM5119PSQX/NOPB Pinout

LM5119PSQX/NOPB  Symbol

LM5119PSQX/NOPB Footprint

LM5119PSQX/NOPB 3D Model

The LM5119PSQX/NOPB is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz.

The LM5119 device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line under-voltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach to a pad to aid thermal dissipation.

• Emulated Peak Current Mode Control

• Wide Operating Range (5.5 V to 65 VI)

• Easily Configurable for Dual Outputs or Interleaved Single Output

• Robust 3.3-A Peak Gate Drive

• Switching Frequency Programmable to 750 kHz

• Optional Diode Emulation Mode

• Programmable Output from 0.8 V

• Precision 1. 5% Voltage Reference

• Programmable Current Limit

• Hiccup Mode Overload Protection

• Programmable Soft Start

• Programmable Line Undervoltage Lockout

• Automatic Switch-Over to External Bias Supply

• Channel2 Enable Logic Input

• Thermal Shutdown

• Leadless 32-Pin WQFN Package

The following figure shows the functional block diagram of LM5119PSQX/NOPB

LM5119PSQX/NOPB Functional Block Diagram

• Industrial DC-DC Motor Drivers

• Telecom: Servers and Routers

The figure below shows 10-V 4-A, 5-V 8-A Dual Output Application of LM5119PSQX/NOPB

10-V 4-A, 5-V 8-A Dual Output Application

LM5119PSQX/NOPB Package