UCC39161

The UCC39161 low-current hot-swap power manager provides complete power management, hot-swap capability, and circuit-breaker functions with minimal external components. For most applications, the only external component required to operate the device, other then supply bypassing, is a timing capacitor that sets the fault time.

The maximum current level is internally programmed for 0.8 A. While the output current is below 0.8 A, the internal power MOSFET is switched on at a nominal 220 m. When the output current exceeds 0.8 A, the MOSFET transitions from a switch to a constant current source and the fault timer starts charging CT. Once the fault time is reached, the current shuts off for a time, which equates to a 3% duty cycle. The UCC39161 also provides unidirectional current flow, emulating a diode in series with the power MOSFET. The UCC39161 can be put into sleep mode by grounding the SHTDWN pin. In sleep mode, the UCC39161 draws under 5 A of supply current.

Other features of UCC39161 include thermal shutdown and a low thermal-resistance small-outline power package.