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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20
19
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15
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13
12
11

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

TL2217-285

FIXED-VOLTAGE REGULATORS

FOR SCSI ACTIVE TERMINATION

SLVS066F – NOVEMBER 1991 – REVISED JULY 1999

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating conditions, V

I

= 4.5 V , IO = 500 mA, TJ = 25°C

(unless otherwise noted)

TL2217-285

PARAMETER

TEST CONDITIONS

†

MIN TYP MAX

UNIT

p

TJ = 25°C 2.81 2.85 2.89

Output voltage

I

O

= 20 mA to

500 mA

,

V

I

= 3.85 V to 5.5

V

TJ = 0°C to 125°C 2.765 2.935

V

Input voltage regulation VI = 3.85 V to 5.5 V 5 15 mV
Ripple rejection f = 120Hz, V

ripple

= 1 V

PP

–62 dB
Output voltage regulation IO = 20 mA to 500 mA 5 30 mV
Output noise voltage f = 10 Hz to 100 kHz 500 µV
Dropout voltage 1 V

IO = 0 2 5

Bias current

IO = 27 mA, equivalent 1 line asserted 3 6

mA

IO = 500 mA, equivalent 18 lines asserted (8 bit) 26 49

†

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-µF tantalum capacitor
with equivalent series resistance of 1.5 Ω on the output.

electrical characteristics over recommended operating conditions, V

I

= 4.5 V , I

O

= 500 mA, TJ = 25°C

(unless otherwise noted)

TL2217-285Y

PARAMETER

TEST CONDITIONS

†

MIN TYP MAX

UNIT

Output voltage IO = 20 mA to 500 mA, VI = 3.85 V to 5.5 V 2.81 2.85 2.89 V
Input voltage regulation VI = 3.85 V to 5.5 V 5 15 mV
Ripple rejection f = 120 Hz, V

ripple

= 1 V

PP

–62 dB
Output voltage regulation IO = 20 mA to 500 mA 5 30 mV
Output noise voltage f = 10 Hz to 100 kHz 500 µV
Dropout voltage IO = 500 mA 1 V

IO = 0 2 5

Bias current

IO = 27 mA, equivalent 1 line asserted 3 6

mA

IO = 500 mA, equivalent 18 lines asserted (8 bit) 26 49

†

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-µF tantalum capacitor
with equivalent series resistance of 1.5 Ω on the output.

TL2217-285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION

SLVS066F – NOVEMBER 1991 – REVISED JULY 1999

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

COMPENSATION-CAPACITOR SELECTION INFORMATION

The TL2217-285 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. Figure 3 and
Figure 4 can be used to establish the capacitance value and ESR range for best regulator performance.

Figure 1

2.4

2.2
2

1.8

0 0.1 0.2 0.3

ESR – Equivalent Series Resistance –

2.6

2.8

3

0.4 0.5

Not Recommended
Potential Instability

1.2
1

0.8

0.6

1.4

1.6

0.4

0.2
0

ESR (OUTPUT CAPACITOR)

vs

LOAD CURRENT

Ω

IL – Load Current – A

Applied Load

Current

Load

Voltage

∆ I

L

∆ V

L

Max ESR Boundary

Min ESR
Boundary

CL = 22 µF
CI = 0.1 µF
TJ = 25°C

Figure 2

0.02

0.015

0.005

0

0 0.5 1 1.5 2 2.5 3

0.025

0.035

3.5 4 4.5 5

0.01

0.03

0.04

STABILITY

vs

ESR

Not Recommended
Potential Instability
Recommended Min ESR

22 µF

100 µF

200 µF

400 µF

1000 µF

Region of

Best Stability

1/ESR

L

C

10 µF

TL2217-285

FIXED-VOLTAGE REGULATORS

FOR SCSI ACTIVE TERMINATION

SLVS066F – NOVEMBER 1991 – REVISED JULY 1999

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

TERMPWR

Connector

1N5817

5-V

Logic

Supply

TL2217-285

OUTPUTINPUT

GND

110 Ω (each resistor)

1%

0.1 µF

+

22 µF
Tantalum

0.1 µF
Ceramic

VO = 2.85 V

DB(0)
DB(1)

ATN
BSY

RST
MSG

ACK

SEL
C/D

I/O

REQ

Figure 3. Typical Application Schematic

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pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

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Copyright  1999, Texas Instruments Incorporated