TL-SCSI285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999
D
D
D
D
D
D
D
D
D
PW PACKAGE
(TOP VIEW)
Fully Matches Parameters for SCSI
Alternative 2 Active Termination
Fixed 2.85-V Output
±1% Maximum Output Tolerance at
TJ = 25°C
0.7-V Maximum Dropout Voltage
620-mA Output Current
±2% Absolute Output Variation
Internal Overcurrent-Limiting Circuitry
Internal Thermal-Overload Protection
Internal Overvoltage Protection
HEAT
SINK
GND
INPUT
HEAT
SINK
description
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
HEAT
SINK
GND
OUTPUT
HEAT
SINK
HEAT SINK – These terminals have
an internal resistive connection to
ground and should be grounded or
electrically isolated.
The TL-SCSI285 is a low-dropout (0.7-V)
fixed-voltage regulator specifically designed for
small computer systems interface (SCSI)
alternative 2 active signal termination. The
TL-SCSI285 0.7-V maximum dropout ensures
compatibility with existing SCSI systems, while
providing a wide TERMPWR voltage range. At the
same time, the ±1% initial tolerance on its 2.85-V
output voltage ensures a tighter line-driver current
tolerance, thereby increasing the system noise
margin.
KC PACKAGE
(TOP VIEW)
OUTPUT
GND
INPUT
The GND terminal is in electrical
contact with the mounting base.
The fixed 2.85-V output voltage of the TL-SCSI285 supports the SCSI alternative 2 termination standard, while
reducing system power consumption. The 0.7-V maximum dropout voltage brings increased TERMPWR
isolation, making the device ideal for battery-powered systems. The TL-SCSI285, with internal current limiting,
overvoltage protection, ESD protection, and thermal protection, offers designers enhanced system protection
and reliability.
When configured as a SCSI active terminator, the TL-SCSI285 low-dropout regulator eliminates the 220-Ω and
the 330-Ω resistors required for each transmission line with a passive termination scheme, reducing significantly
the continuous system power drain. When placed in series with 110-Ω resistors, the device matches the
impedance level of the transmission cable and eliminates reflections.
The TL-SCSI285 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TJ
PLASTIC
POWER
(KC)
SURFACE
MOUNT
(PW)
0°C to 125°C
TL-SCSI285KC
TL-SCSI285PWR
CHIP
FORM
(Y)
TL-SCSI285Y
The PW package is only available taped and reeled. Chip forms are tested
at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
TL-SCSI285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999
absolute maximum ratings over operating virtual junction temperature range (unless otherwise
noted)†
Continuous input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 V
Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 150°C
Package thermal impedance, θJA (see Notes 1 and 2): KC package . . . . . . . . . . . . . . . . . . . . . . . . . . . 22°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: KC or PW package . . . . . . . . . . . . . 260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. Due to
variations in individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be
activated at power levels slightly above or below the rated dissipation.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
TL-SCSI285
Input voltage, VI
MIN
MAX
3.55
5.5
KC package
0
620
PW package
0
500
0
125
TJ = 25°C
TJ = 0°C to 125°C
Input voltage, VI
Output current,
current IO
Operating virtual junction temperature range, TJ
UNIT
V
V
mA
°C
electrical characteristics, VI = 4.5 V, IO = 500 mA, TJ = 25°C (unless otherwise noted)
Output voltage
Input regulation
Ripple rejection
IO = 20 mA to 500 mA,
IO = 500 mA to 620 mA,
VI = 3.55 V to 5.5 V,
VI = 3.65 V to 5.5 V,
VI = 3.55 V to 5.5 V
f = 120 Hz,
Vripple = 1 VO(PP)
TJ = 25°C
TJ = 0 to 125°C
MIN
TYP
MAX
2.82
2.85
2.88
2.79
2.91
5
Output regulation
IO = 20 mA to 620 mA
IO = 20 mA to 500 mA
Output noise voltage
f = 10 Hz to 100 kHz
Dropout voltage
IO = 500 mA
IO = 620 mA
Bias current
TL-SCSI285KC
TEST CONDITIONS‡
PARAMETER
15
–62
5
30
5
30
0.8
IO = 500 mA, equivalent 18 lines asserted (8-bit)
IO = 620 mA
mV
mV
µV
0.7
2
V
dB
500
IO = 0
IO = 27 mA, equivalent 1 line asserted
UNIT
V
5
3
6
26
49
mA
37
62
‡ Pulse-testing techniques are used to maintain the virtual junction temperature as close to the ambient temperature as possible. Thermal effects
must be taken into account separately. All characteristics are measured with a 0.1-µF capacitor across the input and a 22.0-µF tantalum capacitor
with equivalent series resistance of 1.5 Ω on the output.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TL-SCSI285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999
electrical characteristics, VI = 4.5 V, IO = 500 mA, TJ = 25°C (unless otherwise noted)
Output voltage
IO = 20 mA to 500 mA
mA,
VI = 3.55
3 55 V to 5.5
55V
Input regulation
VI = 3.55 V to 5.5 V
f = 120 Hz,
Vripple = 1 VO(PP)
Ripple rejection
Output regulation
Output noise voltage
TL-SCSI285PW
TEST CONDITIONS†
PARAMETER
TJ = 25°C
TJ = 0 to 125°C
MIN
TYP
MAX
2.82
2.85
2.88
2.79
2.91
5
15
–62
IO = 20 mA to 500 mA
f = 10 Hz to 100 kHz
5
IO = 500 mA
IO = 0
Bias current
IO = 27 mA, equivalent 1 line asserted
IO = 500 mA, equivalent 18 lines asserted (8-bit)
V
mV
dB
30
mV
µV
500
Dropout voltage
UNIT
0.7
2
V
5
3
6
26
49
mA
† Pulse-testing techniques are used to maintain the virtual junction temperature as close to the ambient temperature as possible. Thermal effects
must be taken into account separately. All characteristics are measured with a 0.1-µF capacitor across the input and a 22.0-µF tantalum capacitor
with equivalent series resistance of 1.5 Ω on the output.
electrical characteristics, VI = 4.5 V, IO = 500 mA, TJ = 25°C
TEST CONDITIONS†
PARAMETER
Output voltage
IO = 20 mA to 500 mA,
VI = 3.55 V to 5.5 V
VI = 3.55 V to 5.5 V
Input regulation
Ripple rejection
f = 120 Hz,
Vripple = 1 VO(PP)
Output regulation
IO = 20 mA to 620 mA
IO = 20 mA to 500 mA
Output noise voltage
f = 10 Hz to 100 kHz
Bias current
TL-SCSI285Y
MIN
TYP
2.85
UNIT
V
5
mV
–62
dB
5
5
500
IO = 0
IO = 27 mA, equivalent 1 line asserted
MAX
mV
µV
2
3
IO = 500 mA, equivalent 18 lines asserted (8-bit)
IO = 620 mA
26
mA
37
† Pulse-testing techniques are used to maintain the virtual junction temperature as close to the ambient temperature as possible. Thermal effects
must be taken into account separately. All characteristics are measured with a 0.1-µF capacitor across the input and a 22.0-µF tantalum capacitor
with equivalent series resistance of 1.5 Ω on the output.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
TL-SCSI285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999
APPLICATION INFORMATION
Connector
TERMPWR
1N5817
5-V
Logic
Supply
110 Ω
1%
TL-SCSI285
INPUT
OUTPUT
GND
DB(0)
DB(1)
0.1 µF
0.1 µF
Ceramic
+
22 µF
Tantalum
Figure 1. Typical Application Schematic
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
ATN
BSY
ACK
RST
MSG
SEL
C/D
REQ
I/O
TL-SCSI285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999
COMPENSATION CAPACITOR SELECTION INFORMATION
The TL-SCSI285 is a low-dropout regulator. This means that the capacitance loading is important to the
performance of the regulator because it is a vital part of the control loop. The capacitor value and the equivalent
series resistance (ESR) both affect the control loop and must be defined for the load range and the temperature
range. Figures 2 and 3 can be used to establish the capacitance value and ESR range for best regulator
performance.
ESR OF OUTPUT CAPACITOR
vs
LOAD CURRENT
3
2.6
2.4
0.04
Not Recommended
Potential Instability
0.03
2.2
2
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ
1.6
1.4
1.2
400 µF
0.02
200 µF
0.015
1
Min ESR
Boundary
0.8
0.6
0.4
100 µF
0.01
22 µF
0.005
0.2
0
0
0.1
0.2
0.4
0.3
0.5
10 µF
0
0
0.5
Load
Voltage
1
1.5
2
2.5
3
3.5
4
4.5
5
1/ESR
IL – Load Current – A
Applied Load
Current
1000 µF
Region of
Best Stability
0.025
Max ESR Boundary
1.8
ÇÇÇ
ÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇÇÇÇÇÇ
Not Recommended
Potential Instability
Recommended Min ESR
0.035
CL
ESR – Equivalent Series Resistance – Ω
ÇÇ
ÇÇ
CL = 22.0 µF
CI = 0.1 µF
TJ = 25°C
2.8
STABILITY
vs
ESR
Figure 3
∆ IL
∆ VL
Figure 2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
PACKAGE OPTION ADDENDUM
www.ti.com
23-Aug-2010
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
Samples
(Requires Login)
TL-SCSI285KC
OBSOLETE
TO-220
KC
3
TBD
Call TI
Call TI
Samples Not Available
TL-SCSI285KCE3
OBSOLETE
TO-220
KC
3
TBD
Call TI
Call TI
Samples Not Available
TL-SCSI285KCSE3
ACTIVE
TO-220
KCS
3
50
Pb-Free (RoHS)
CU SN
N / A for Pkg Type
Request Free Samples
TL-SCSI285PWR
ACTIVE
TSSOP
PW
20
2000
Green (RoHS
& no Sb/Br)
Call TI
Level-1-260C-UNLIM
Contact TI Distributor
or Sales Office
TL-SCSI285PWRE4
ACTIVE
TSSOP
PW
20
2000
Green (RoHS
& no Sb/Br)
Call TI
Level-1-260C-UNLIM
Contact TI Distributor
or Sales Office
TL-SCSI285PWRG4
ACTIVE
TSSOP
PW
20
2000
Green (RoHS
& no Sb/Br)
Call TI
Level-1-260C-UNLIM
Contact TI Distributor
or Sales Office
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
5-May-2011
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
TL-SCSI285PWR
Package Package Pins
Type Drawing
TSSOP
PW
20
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
2000
330.0
16.4
Pack Materials-Page 1
6.95
B0
(mm)
K0
(mm)
P1
(mm)
7.1
1.6
8.0
W
Pin1
(mm) Quadrant
16.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
5-May-2011
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TL-SCSI285PWR
TSSOP
PW
20
2000
346.0
346.0
33.0
Pack Materials-Page 2
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