TPS2553DRVR

The purpose of the TPS2552/53 and TPS2552-1/53-1 power-distribution switches is to provide current-limited, power-distribution capabilities using N-channel MOSFETs for applications where short circuits or heavy capacitive loads may be encountered. These devices allow the user to program the current-limit threshold between 75 mA and 1.3 A via an external resistor. Additionally, they offer features such as overtemperature protection and reverse-voltage protection. The devices incorporate internal charge pump and gate drive circuitry necessary to drive the N-channel MOSFET, meeting the requirements of self-powered hubs and bus-powered hubs. The power-distribution switches are adjustable, have a ±6% current-limit accuracy at 1.3 A, and meet USB current-limiting requirements. They are suitable for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. The devices also offer constant-current and latch-off versions, with fast overcurrent response and reverse input-output voltage protection. The power-distribution switches have an operating range of 2.5 V to 6.5 V and a maximum standby supply current of 1 µA. The devices are designed to resume normal operation once the overload condition is removed, with latch-off devices remaining off until the surrounding system toggles the enable or cycles power to the device. The low on-resistance of the N-channel MOSFET allows small surface-mount packages to pass large currents, making it essential to estimate power dissipation and junction temperature for proper design. [2, 3]

The FAULT logic output in the TPS2552/devices is asserted (active low) during an overcurrent, overtemperature, or reverse-voltage condition. It remains asserted until the fault condition is removed, and the device resumes normal operation. The FAULT signal is de-asserted once device power is cycled or the enable is toggled, and the device resumes normal operation. The TPS2552/devices are designed to eliminate false FAULT reporting by using an internal delay "deglitch" circuit for overcurrent and reverse-voltage conditions until the fault is removed. Additionally, the FAULT logic output is asserted immediately during an overtemperature shutdown condition. [2, 2, 2, 2, 2]

The current-limit threshold in the TPS2552/devices can be adjusted between 75mA and 1.3A via an external resistor [2]. This allows for precision current limiting when heavy capacitive loads or short circuits are encountered [2]. The programmable current-limit threshold offers an accuracy as tight as +/-6% at higher current-limit settings [2].