Texas Instruments TL2217-285PWR, TL2217-285PWLE, TL2217-285KC Datasheet
TL2217-285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS066F – NOVEMBER 1991 – REVISED JULY 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Fully Matches Parameters for SCSI
Alternative 2 Active Termination
D
Fixed 2.85-V Output
D
±1.5% Maximum Output Tolerance
at TJ = 25°C
D
1-V Maximum Dropout Voltage
D
500-mA Output Current
D
±3% Absolute Output Variation
D
Internal Overcurrent-Limiting Circuitry
D
Internal Thermal-Overload Protection
D
Internal Overvoltage Protection
description
The TL2217-285 is a low-dropout (1 V) fixedvoltage regulator specifically designed for small
computer systems interface (SCSI) alternative 2
active signal termination. The TL2217-285 1-V
maximum dropout ensures compatibility with
existing SCSI systems, while providing a wide
TERMPWR voltage range. At the same time, the
±1.5% initial tolerance on its 2.85-V output voltage
ensures a tighter line-driver current tolerance,
thereby increasing system noise margin.
The fixed 2.85-V output voltage of TL2217-285
supports the SCSI alternative 2 termination
standard, while reducing system power
consumption. The 1-V maximum dropout voltage
brings increased TERMPWR isolation, making
the device ideal for battery-powered systems. The
TL2217-285, 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 TL2217-285 low-dropout regulator eliminates the 220-Ω and
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 TL2217-285 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
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.
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.
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GND
OUTPUT
HEAT
SINK
HEAT
SINK
HEAT SINK – These pins have an internal
resistive connection to ground and should
be grounded or electrically isolated.
OUTPUT
GND
INPUT
GND
KTP PACKAGE
†
(TOP VIEW)
GND
†
The GND terminal is in electrical contact with
the mounting base.
GND
INPUT
HEAT
SINK
HEAT
SINK
OUTPUT
GND
INPUT
PW PACKAGE
(TOP VIEW)
KC PACKAGE
†
(TOP VIEW)
TL2217-285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS066F – NOVEMBER 1991 – REVISED JULY 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICES
T
J
PLASTIC
POWER
(KC)
PLASTIC FLANGE
MOUNT
(KTP)
SURFACE
MOUNT
(PW)
CHIP
FORM
(Y)
0°C to 125°C TL2217-285KC TL22I7-285KTP TL22I7-285PWR TL2217-285Y
The KTP and PW packages are only available taped and reeled. Add the suffix R to the device type
(e.g., TL2217–285KTPR). Chip forms are tested at 25°C.
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. . . . . . . . . . . . . . . . . . . . . . . . . . .
KTP package 28°C/W. . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–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),
θ
JA
, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) – TA)/
θ
JA
. 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
MIN MAX UNIT
Input voltage, V
I
3.85 5.5 V
Output current, I
O
0 500 mA
Operating virtual junction temperature range, T
J
TL2217–285 0 125 °C
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