Burr Brown REG1118-2.85, REG1118-2.85-2K5 Datasheet

REG1118

FEATURES

● SOURCES 800mA, SINKS 400mA

● 2.85V OUTPUT FOR SCSI ACTIVE

NEGATION TERMINATION

● 1.3V max DROPOUT VOLTAGE AT

I

O

= 800mA

● INTERNAL CURRENT LIMIT

● THERMAL OVERLOAD PROTECTION

● SOT-223 SURFACE MOUNT PACKAGE

800mA Low Dropout Positive Regulator

with Current Source and Sink Capability

®

©

1996 Burr-Brown Corporation PDS-1352B Printed in U.S.A. January, 1997

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

APPLICATIONS

● SCSI-2 AND SCSI-3 DEVICES

● FAST-20 SCSI

● ACTIVE NEGATION SCSI TERMINATORS

● SUPPLY SPLITTER GROUND GENERATION

DESCRIPTION

The REG1118-2.85 is a three-terminal voltage regula­tors 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.

Laser trimming assures excellent output voltage accu­racy. An NPN output stage allows output stage drive
current to contribute to the source load current for
maximum efficiency.

REG1118 is packaged in a SOT-223 surface-mount
package, suitable for reflow soldering techniques.

REG1118

REG1118

GND

V

IN

V

OUT

4.7µF10µF

TERMPWR

110Ω

110Ω

User Supplied

Resistor Network

REG1118-2.85 Used to Make Active Negation SCSI Terminator

Signal Line N

Signal Line 1

Signal Line 2

Signal Line 3

Up To

27 Lines

110Ω

110Ω

®

REG1118

2

SPECIFICATIONS

At TA = 0°C to 70°C, TERMPWR = +5V, unless otherwise noted.

REG1118-2.85
PARAMETER CONDITIONS MIN TYP MAX UNITS
OUTPUT VOLTAGE

No Load, T

A

= 25°C 2.82 2.85 2.88 V

All Operating Conditions

(1)

2.79 2.85 2.91 V

LINE REGULATION

(2)

IO = 0, V

IN

= 4.75V to 6V 0.3 4 mV

LOAD REGULATION

(2)

IO = 0 to 800mA 2 25 mV

I

O

= –400 to 0mA 25 60 mV

DROPOUT VOLTAGE

(3)

TA = 25°C

I

O

= 100mA 0.8 1.1 V

I

O

= 800mA 1.1 1.3 V

CURRENT LIMIT T

A

= 25°C

Positive (I

SC

+)

(4)

800 1450 mA

Negative (I

SC

–) V

OUT

= 3.7V –750 –400 mA

QUIESCENT CURRENT I

O

= 0 3 7 mA

RIPPLE REJECTION T

A

= 25°C

f = 120Hz, V

IN

– V

OUT

= 2V, V

RIPPLE

= 0.5Vp-p 56 dB

LONG-TERM STABILITY

T

A

= +125°C, 1000Hr 0.2 %

THERMAL SHUTDOWN

Junction Temperature Shutdown 150 °C
Junction Temperature Reset 140 °C

THERMAL RESISTANCE

Specified Junction Temperature Range 0 70 °C
Operating Junction Temperature Range 0 125 °C
Storage Range –55 125 °C
Thermal Resistance

θ

JC

(Junction-to-Case at Tab) 15 °C/W

NOTES: (1) All operating conditions include the combined effects of load current, input voltage, and temperature over each parameter’s full specified range.
(2) Load and line regulation are tested at a constant junction temperature by low duty cycle testing. (3) Dropout voltage is defined as the minimum input-to-output
voltage that produces a 1% decrease in output voltage. (4) V

OUT

to ground through 1Ω.

ABSOLUTE MAXIMUM RATINGS

Input Voltage..........................................................................................7V

Output Voltage ........................................................... –0.2V to (V+) +0.5V

Short-Circuit Duration ..................................................................Indefinite

Operating Junction Temperature Range............................. 0°C to +125°C

Storage Temperature Range ..........................................–55°C to +125°C

Lead Temperature (soldering, 10s)

(1)

............................................. +300°C

NOTE: (1) See “Soldering Methods.”

Front View SOT-223

CONNECTION DIAGRAM

Tab is connected

to Ground

V

IN

GroundV

OUT

Plastic SOT-223

PRODUCT

(1)

PART MARKING PACKAGE

REG1118-2.85 BB11182 SOT-223

NOTE: (1) Available in Tape and Reel, add –TR to Model Number.

ORDERING INFORMATION

PACKAGE INFORMATION

PACKAGE DRAWING

PRODUCT PACKAGE NUMBER

(1)

REG1118-2.85 SOT-223 311

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.