8.1 Overview

The TPS2553-Q1 device is a current-limited, N-channel MOSFET, power-distribution switch for use in applications where short circuits or heavy capacitive loads will be encountered. The device may provide up to 1.5 A of continuous load current. This device allows the user to program the current-limit threshold between 75 mA and 1.7 A (typical) via an external resistor. Additional device shutdown features include overtemperature protection and reverse-voltage protection. The device incorporates an internal charge pump and gate drive circuitry necessary to drive the N-channel MOSFET. The charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage to limit large current and voltage surges and provides built-in soft-start functionality. The TPS2553-Q1 device enters constant-current mode when the load exceeds the current-limit threshold.