UR5516A

DESCRIPTION

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

tracks the voltage at V REF 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.

 FEATURES

* Provide bi-direction current

- Sourcing or sinking current up to 3A

* 1.25V/0.9V output for DDR I/II applications

* Fast transient response

* High output accuracy

- ±20mv over load, V OUT  offset and temperature

* Adjustable output voltage by external resistors

* Current-limit protection

* On-chip thermal shutdown

* Shutdown for standby or suspend mode

规格书UR5516A