The UCC3837 linear voltage regulator controller includes all the features required for an extremely low-dropout linear voltage regulator using an external n-channel MOSFETs as pass transistors. The 8-pin controller IC features duty ratio current-limiting technology to provide peak transient load capacity while limiting the average power consumption of the pass transistor under fault conditions.
Application information
The UCC2837DTR can operate from input voltages as low as 3V and can provide high current levels, providing an effective linear solution for custom processor voltages, bus termination voltages, and other logic-level voltages below 3V.
Load current, timing capacitance voltage and output voltage under fault condition.
The on-board charge pump produces a grid drive voltage capable of driving an external N-MOSFET, which is optimal for low voltage and high efficiency. The IC's wide versatility allows users to optimize current limit and output voltage Settings for applications that are beyond or between the standard 3-terminal linear voltage regulator range.
Block diagram
Features
• An onboard charge pump drives an external N-MOSFET
• Lower the input power to 3V
• Duty cycle mode overcurrent protection
• Very low drop voltage
• Low external parts count
• The output power is reduced to 1.5V
Connection diagram
