POWER MANAGEMENT

1

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SC1118

1A (Sink & Source) Low Dropout, Low

Quiescent Current Voltage Regulator

Revision: June 10, 2004

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.

Active negation SCSI terminations

Computers

Disk drives

CD-ROM drives

Supply splitter

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 C

Fast settling time

SOT-223 and SO-8 surface mount packages

VOUT

VIN

C2

1uF

C1

1uF

U1 SC1118ST-x.x

1

2, TAB

3

IN

GND

OUT

1

R

I

2

R

1

R

1

V

V

FB

FB

OUT

•

+











 +

•

=

Description

Features

Applications

Typical Application Circuits

VOUT

VIN

C2

1uF

C1

1uF

U1 SC1118S-x.x

1, 4

2

8

3, 6, 7

5

IN

OUT

EN

GND

NC

VIN

VOUT

U1

SC1118S

1, 4

5

8

3, 6, 7

2

IN

OUT

FB

EN

GND

R1

R2

C1

1uF

C2

1uF