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UR5516A - 3A BUS TERMINATION REGULATOR

Description

The UTC UR5516A is designed to provide a regulated voltage with bi-directional output current for DDR-SDRAM termination.

Features

  • S.
  • Provide bi-direction current - Sourcing or sinking current up to 3A.
  • 1.25V/0.9V output for DDR I/II.

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Full PDF Text Transcription

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UNISONIC TECHNOLOGIES CO., LTD UR5516A LINEAR INTEGRATED CIRCUIT 3A BUS TERMINATION REGULATOR  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 VREF pin. A resistor divider connected to VIN, GND and VREF pins is used to provide a half voltage of VIN to VREF pin. In addition, an external ceramic capacitor and an open-drain transistor connected to VREF pin provides soft-start and shutdown control respectively. Pulling and holding the VREF to GND shuts off the output.
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