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PDF LM117 Data sheet ( Hoja de datos )

Número de pieza LM117
Descripción 3-Terminal Adjustable Regulator
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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April 2007
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 volt-
age. 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 sit-
uated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output ca-
pacitor 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 “float-
ing” 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, i.e.,
avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching reg-
ulator, 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. Supplies
with electronic shutdown can be achieved by clamping the
adjustment terminal to ground which programs the output 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 neg-
ative complement, see LM137 series data sheet.
Features
Guaranteed 1% output voltage tolerance (LM317A)
Guaranteed max. 0.01%/V line regulation (LM317A)
Guaranteed max. 0.3% load regulation (LM117)
Guaranteed 1.5A output current
Adjustable output down to 1.2V
Current limit constant with temperature
P+ Product Enhancement tested
80 dB ripple rejection
Output is short-circuit protected
Typical Applications
1.2V–25V Adjustable Regulator
LM117/LM317A/LM317 Package Options
Part
Number
Suffix
Package
Output
Current
LM117, LM317
K
TO-3
1.5A
LM317
T TO-220 1.5A
LM317
S TO-263 1.5A
LM317A, LM317
EMP SOT-223 1.0A
LM117, LM317A, LM317 H
TO-39 0.5A
LM117
E
LCC
0.5A
LM317A, LM317
MDT TO-252 0.5A
906301
Full output current not available at high input-output voltages
*Needed if device is more than 6 inches from filter capacitors.
†Optional—improves transient response. Output capacitors in the range
of 1μF to 1000μF of aluminum or tantalum electrolytic are commonly used
to provide improved output impedance and rejection of transients.
SOT-223 vs. TO-252 (D-Pak)
Packages
Scale 1:1
906354
© 2007 National Semiconductor Corporation 9063
www.national.com

1 page




LM117 pdf
LM317A and LM317 Electrical Characteristics (Note 3)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.
Parameter
Conditions
LM317A
LM317
Min Typ Max Min Typ Max Units
1.238 1.250 1.262 - 1.25 -
V
Reference Voltage
Line Regulation
3V (VIN − VOUT) 40V,
10 mA IOUT IMAX
3V (VIN − VOUT) 40V (Note 4)
1.225 1.250 1.270 1.20 1.25 1.30 V
0.005 0.01
0.01 0.02
0.01
0.02
0.04
0.07
%/V
Load Regulation
10 mA IOUT IMAX (Note 4)
0.1 0.5
0.3 1
0.1 0.5
0.3 1.5
%
Thermal Regulation
20 ms Pulse
0.04 0.07
0.04 0.07 %/W
Adjustment Pin Current
50 100
50 100 μA
Adjustment Pin Current Change
Temperature Stability
Minimum Load Current
Current Limit
10 mA IOUT IMAX
3V (VIN − VOUT) 40V
TMIN TJ TMAX
(VIN − VOUT) = 40V
(VIN − VOUT) 15V
K, T, S Packages
EMP Package
H, MDT Packages
(VIN − VOUT) = 40V
K, T, S Packages
EMP Package
H, MDT Packages
0.2 5
1
3.5 10
0.2 5 μA
1%
3.5 10 mA
- - - 1.5 2.2 3.4
1.5 2.2 3.4 1.5 2.2 3.4 A
0.5 0.8 1.8 0.5 0.8 1.8
-
0.112
0.075
-
0.30
0.20
0.15
0.112
0.075
0.40
0.30
0.20
A
RMS Output Noise, % of VOUT
10 Hz f 10 kHz
0.003
0.003
%
Ripple Rejection Ratio
Long-Term Stability
Thermal Resistance, θJC
Junction-to-Case
VOUT = 10V, f = 120 Hz, CADJ = 0 μF
VOUT = 10V, f = 120 Hz, CADJ = 10 μF
TJ = 125°C, 1000 hrs
K (TO-3) Package
T (TO-220) Package
S (TO-263) Package
EMP (SOT-223) Package
H (TO-39) Package
MDT (TO-252) Package
65
66 80
0.3
-
-
-
23.5
21
12
1
65 dB
66 80
dB
0.3 1
%
2
4
4 °C/W
23.5
21
12
Thermal Resistance, θJA
Junction-to-Ambient
(No Heat Sink)
K (TO-3) Package
T (TO-220) Package
S (TO-263) Package (Note 6)
EMP (SOT-223) Package (Note 6)
H (TO-39) Package
MDT (TO-252) Package (Note 6)
-
-
-
140
186
103
39
50
50
140
°C/W
186
103
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
The guaranteed specifications apply only for the test conditions listed.
Note 2: Refer to RETS117H drawing for the LM117H, or the RETS117K for the LM117K military specifications.
Note 3: IMAX = 1.5A for the K (TO-3), T (TO-220), and S (TO-263) packages. IMAX = 1.0A for the EMP (SOT-223) package. IMAX = 0.5A for the H (TO-39), MDT
(TO-252), and E (LCC) packages. Device power dissipation (PD) is limited by ambient temperature (TA), device maximum junction temperature (TJ), and package
thermal resistance (θJA). The maximum allowable power dissipation at any temperature is : PD(MAX) = ((TJ(MAX) - TA)/θJA). All Min. and Max. limits are guaranteed
to National's Average Outgoing Quality Level (AOQL).
Note 4: Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects
are covered under the specifications for thermal regulation.
Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 6: When surface mount packages are used (TO-263, SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by increasing the PC
board copper area that is thermally connected to the package. See the Applications Hints section for heatsink techniques.
5 www.national.com

5 Page





LM117 arduino
Layout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TABLE 1. θJA Different Heatsink Area
Copper Area
Top Side (in2)*
Bottom Side (in2)
0.0123
0.066
0.3
0.53
0.76
1.0
0.066
0.066
0.066
0.066
0.066
0.066
0.175
0.284
0.392
0.5
0
0
0
0
0
0
0.2
0.4
0.6
0.8
1.0
0.066
0.175
0.284
0.392
0.5
Note: * Tab of device attached to topside of copper.
Thermal Resistance
(θJA°C/W) TO-252
103
87
60
54
52
47
84
70
63
57
57
89
72
61
55
53
906361
FIGURE 9. θJA vs 2oz Copper Area for TO-252
11 www.national.com

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