The TPS2330 and TPS2331 are single-channel hot-swap controllers that use an external n-channel mosfet as a high-side switch in power applications. The features of these devices, such as overcurrent protection (OCP), inrush current control, output power status reporting, and the ability to distinguish load transients from failures, are key requirements for hot swap applications.
Functional block diagram
The TPS2330/31 device contains undervoltage Lock (UVLO) and Power Good (PG) reports to ensure that the device is turned off at startup and to confirm the status of the output voltage rail during operation. An internal charge pump, capable of driving multiple MosFeTs, provides enough gate drive voltage to fully enhance the n-channel mosFeTs. The charge pump controls the mosfet's rise time and fall time (dV/dt), reducing power transients during power rise/fall.
Typical application diagram
The circuit breaker function combines the ability to sense overcurrent conditions with the timer function. This allows designs such as DSPS, which may have very high peak currents during power state transitions, to ignore transients within programmable cycles.
The following figure shows a typical dual-hot swap application. Pull-up resistors for PWRGD and FAULT should be relatively large (e.g. 100 kΩ) to reduce power loss unless a large load is required to drive
