LM317A National Semiconductor, LM317A Datasheet
LM317A
Manufacturer Part Number
LM317A
Description
3-Terminal Adjustable Regulator
Manufacturer
National Semiconductor
Datasheet
1.LM317A.pdf
(26 pages)
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© 1999 National Semiconductor Corporation
LM117/LM317A/LM317
3-Terminal Adjustable Regulator
General Description
The LM117 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 1.5A over a
1.2V to 37V output range. They are exceptionally easy to
use and require only two external resistors to set the output
voltage. Further, both line and load regulation are better than
standard fixed regulators. Also, the LM117 is packaged in
standard transistor packages which are easily mounted and
handled.
In addition to higher performance than fixed regulators, the
LM117 series offers full overload protection available only in
IC’s. Included on the chip are current limit, thermal overload
protection and safe area protection. All overload protection
circuitry remains fully functional even if the adjustment termi-
nal is disconnected.
Normally, no capacitors are needed unless the device is situ-
ated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output
capacitor can be added to improve transient response. The
adjustment terminal can be bypassed to achieve very high
ripple rejection ratios which are difficult to achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 is useful in a
wide variety of other applications. Since the regulator is
“floating” and sees only the input-to-output differential volt-
Typical Applications
Full output current not available at high input-output voltages
of 1 µF to 1000 µF of aluminum or tantalum electrolytic are commonly
used to provide improved output impedance and rejection of transients.
*
†
Needed if device is more than 6 inches from filter capacitors.
Optional — improves transient response. Output capacitors in the range
1.2V–25V Adjustable Regulator
DS009063
DS009063-1
age, supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not ex-
ceeded, i.e., avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching
regulator, a programmable output regulator, or by connecting
a fixed resistor between the adjustment pin and output, the
LM117 can be used as a precision current regulator. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
For applications requiring greater output current, see LM150
series (3A) and LM138 series (5A) data sheets. For the
negative complement, see LM137 series data sheet.
Features
n Guaranteed 1% output voltage tolerance (LM317A)
n Guaranteed max. 0.01%/V line regulation (LM317A)
n Guaranteed max. 0.3% load regulation (LM117)
n Guaranteed 1.5A output current
n Adjustable output down to 1.2V
n Current limit constant with temperature
n P
n 80 dB ripple rejection
n Output is short-circuit protected
LM117 Series Packages
SOT-223 vs D-Pak (TO-252)
Packages
Part Number
+
Suffix
Product Enhancement tested
EMP
MDT
K
H
E
S
T
Package
SOT-223
TO-220
TO-263
TO-252
TO-39
TO-3
LCC
Scale 1:1
Current
Design
Load
0.5A
1.5A
0.5A
1.5A
0.5A
1.5A
1A
DS009063-54
www.national.com
August 1999
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