®
REG1118
REG1118
800mA Low Dropout Positive Regulator
with Current Source and Sink Capability
DESCRIPTION
FEATURES
The REG1118-2.85 is a three-terminal voltage regula-
tors capable of sourcing up to 800mA and sinking up
to 400mA. The sinking capability is important in SCSI
applications where active negation line drivers are
used. The REG1118-2.85 is useful for making a
27-line Boulay terminator capable of interfacing with
active negation drivers required in FAST-20 SCSI
applications. The regulator has active current limits
for both sink and source currents as well as internal
thermal limiting.
● SOURCES 800mA, SINKS 400mA
● 2.85V OUTPUT FOR SCSI ACTIVE
NEGATION TERMINATION
● 1.3V max DROPOUT VOLTAGE AT
IO = 800mA
● INTERNAL CURRENT LIMIT
● THERMAL OVERLOAD PROTECTION
● SOT-223 SURFACE MOUNT PACKAGE
Laser trimming assures excellent output voltage accu-
racy. An NPN output stage allows output stage drive
current to contribute to the source load current for
maximum efficiency.
APPLICATIONS
● SCSI-2 AND SCSI-3 DEVICES
● FAST-20 SCSI
REG1118 is packaged in a SOT-223 surface-mount
package, suitable for reflow soldering techniques.
● ACTIVE NEGATION SCSI TERMINATORS
● SUPPLY SPLITTER GROUND GENERATION
110Ω
Signal Line 1
110Ω
Signal Line 2
TERMPWR
110Ω
Up To
REG1118
Signal Line 3
Signal Line N
27 Lines
VIN
VOUT
GND
10µF
4.7µF
110Ω
User Supplied
Resistor Network
REG1118-2.85 Used to Make Active Negation SCSI Terminator
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Internet:http://www.burr-brown.com/•FAXLine:(800)548-6133(US/CanadaOnly)•Cable:BBRCORP•Telex:066-6491•FAX:(520)889-1510•ImmediateProductInfo:(800)548-6132
©1996 Burr-Brown Corporation
PDS-1352B
Printed in U.S.A. January, 1997
SBVS005