TL317_15 Datasheet, PDF (1/22 Pages) Texas Instruments – 3-TERMINAL ADJUSTABLE REGULATOR

TL317
www.ti.com
SLVS004H – APRIL 1979 – REVISED OCTOBER 2011
3-TERMINAL ADJUSTABLE REGULATOR
Check for Samples: TL317
FEATURES
1
• Output Voltage Range Adjustable From
1.25 V to 32 V When Used With an External
Resistor Divider
• Output Current Capability of 100 mA
• Input Regulation Typically 0.01% Per
Input-Voltage Change
• Output Regulation Typically 0.5%
• Ripple Rejection Typically 80 dB
DESCRIPTION
The TL317 is an adjustable three-terminal
positive-voltage regulator capable of supplying 100
mA over an output-voltage range of 1.25 V to 32 V. It
is exceptionally easy to use and requires only two
external resistors to set the output voltage.
In addition to higher performance than fixed
regulators, this regulator offers full overload
protection available only in integrated circuits.
Included on the chip are current-limiting and
thermal-overload protection. All overload-protection
circuitry remains fully functional, even when
ADJUSTMENT is disconnected. Normally, no
capacitors are needed unless the device is situated
far from the input filter capacitors, in which case an
input bypass is needed. An optional output capacitor
can be added to improve transient response.
ADJUSTMENT can be bypassed to achieve very high
ripple rejection, which is difficult to achieve with
standard three-terminal regulators.
D PACKAGE
(TOP VIEW)
INPUT 1
OUTPUT 2
OUTPUT 3
ADJUSTMENT 4
8 NC
7 OUTPUT
6 OUTPUT
5 NC
NC No internal connection
OUTPUT terminals are all internally connected.
PW PACKAGE
(TOP VIEW)
INPUT 1
NC 2
NC 3
ADJUSTMENT 4
8 NC
7 NC
6 OUTPUT
5 NC
NC No internal connection
PS PACKAGE
(TOP VIEW)
INPUT 1
NC 2
NC 3
NC 4
8 OUTPUT
7 NC
6 ADJUSTMENT
5 NC
NC No internal connection
LP PACKAGE
(TOP VIEW)
INPUT
OUTPUT
ADJUSTMENT
In addition to replacing fixed regulators, the TL317 regulator is useful in a wide variety of other applications.
Since the regulator is floating and sees only the input-to-output differential voltage, supplies of several hundred
volts can be regulated as long as the maximum input-to-output differential is not exceeded. Its primary
application is that of a programmable output regulator, but by connecting a fixed resistor between ADJUSTMENT
and OUTPUT, this device can be used as a precision current regulator. Supplies with electronic shutdown can be
achieved by clamping ADJUSTMENT to ground, programming the output to 1.2 V, where most loads draw little
current.
1
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1979–2011, Texas Instruments Incorporated