UR5516A

Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.􀀁 Absolute maximum ratings are stress ratings only and functional device operation is not implied.

The UTC UR5516A is designed to provide a regulated voltage with bi-directional output current for DDR-SDRAM termination. Current-limit work to limit the short-circuit current, on-chip thermal shutdown provides protection against any combination of overload that would create excessive junction temperature.

The output voltage of UR5516A tracks the voltage at VREF pin. A resistor divider connected to V_IN, GND and V_REF pins is used to provide a half voltage of V_IN to V_REF pin. In addition, an external ceramic capacitor and an open-drain transistor connected to V_REF pin provides soft-start and shutdown control respectively. Pulling and holding the V_REF to GND shuts off the output. The output of UTC UR5516A will be high impedance after being shut down by V_REF or thermal shutdown function.