UCD74106RGMR

UCD74106 is a complete power system capable of driving a buck power supply. A single monolithic solution fully integrates high-side MOSFETs, low-side MOSFETs, drivers, current sense circuits, and necessary protection features to help achieve minimum size and maximum efficiency. The driver circuit provides high charge and discharge currents for the high-side NMOS switch and low-side NMOS synchronous rectifier in a synchronous buck circuit. The MOSFET gates are driven to 6.25V by an internally regulated VGG supply. The internal VGG regulator can be disabled to allow the user to provide an independent gate drive voltage. This high flexibility supports a wide power conversion input voltage range of 2.2V to 18V. Internal UVLO logic ensures VGG is valid before allowing the device to operate. The drive logic block supports one of two operating modes. In synchronous mode, the logic block uses a PWM signal to control the high-side and low-side gate drive signals. Dead time is optimized to prevent cross-conduction. The Synchronous Rectifier Enable (SRE) pin controls whether the low-side MOSFET turns on when the PWM signal is low. On-board current sense amplifiers monitor the current to safeguard the power stage from sudden high current loads. In the event of an over-current fault, the output power stage is turned off and the Fault Flag (FLT) is asserted to alert the controller. Output current is measured and monitored by a precision integrated current sense element. This method provides an accuracy of ±5%. The amplified signal is available for use by the controller on the IMON pin. The IMON pin has a positive offset so that both positive (sourcing) and negative (sinking) current can be sensed. If the die temperature exceeds 150°C, the temperature sensor initiates a thermal shutdown that halts output switching and sets the FLT flag. Normal operation resumes when the die temperature falls below the thermal hysteresis band and the Fault Flag is re-set by the controller.

Applications

• Digitally controlled synchronous buck power stage for single-phase and multiphase applications
• Compact, high-efficiency regulator for desktop, server, telecom, and notebook applications
• Synchronous buck power stage

Key features

• Fully integrated power switch with single-phase and multi-phase synchronous buck converter drivers
• Fully compatible with TI Fusion digital power controllers (UCD91xx and UCD92xx series)
• Compatible with analog domain controllers
• Wide input voltage range: 4.5V to 18V, supports external bias supply, operating input voltage as low as 2.2V
• Output current up to 6A
• Operating switching frequency 2MHz
• Current limit with current limit flag
• VIN provides onboard regulated 6V driver supply
• Thermal protection and monitoring