SC1118

1A (Sink & Source) Low Dropout, Low Quiescent Current Voltage Regulator POWER MANAGEMENT Description The SC1118 family of low dropout regulators has the unique capability of maintaining output regulation while sourcing or sinking current. The 2.85V output voltage option is ideal for use as a Boulay termination of up to 27 SCSI data lines. The regulator maintains regulation while both sourcing and sinking current, enabling the use of active negation drivers for improved noise immunity on the data lines. Regulation of output voltage is maintained for TERMPWR voltages as low as 4.0V. When unloaded, quiescent supply current is a low 2mA, allowing continuous connection to the TERMPWR lines. An ultra low power shutdown mode is also available on the SO-8 version. In shutdown the output is high impedance and supply current drops to 100µA (typ.). Current limits in both sourcing and sinking modes, plus on-chip thermal shutdown make the circuit tolerant of output fault conditions. The SC1118 is available in the 3-lead SOT-223 and 8-lead SO-8 packages. SC1118 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Regulates while sourcing or sinking current Provides termination for up to 27 SCSI lines 2mA quiescent current Ultra low power shutdown mode Current limit and thermal shutdown protection Stable for any CLOAD ≥ 0.22µF Fast settling time SOT-223 and SO-8 surface mount packages Applications ‹ ‹ ‹ ‹ ‹ Active negation SCSI terminations Computers Disk drives CD-ROM drives Supply splitter Typical Application Ci...