TEXAS INSTRUMENTS LM317 Technical data

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LM317
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
D
Output V oltage Range Adjustable From
D
Output Current Greater Than 1.5 A
D
Internal Short-Circuit Current Limiting
D
Thermal Overload Protection
D
Output Safe-Area Compensation
D
Package Options Include Plastic Small-Outline Transistor SOT-223 (DCY), Flange Mounted (KTE) and Heat-Sink Mounted (KC) Packages
description
The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of
1.2 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators. The LM317 is packaged in the KC (TO-220AB) and KTE packages, which are easy to handle and use.
In addition to having higher performance than fixed regulators, this device includes on-chip current limiting, thermal overload protection, and safe-operating-area protection. All overload protection remains fully functional, even if the ADJUST terminal is disconnected.
KC PACKAGE
(TOP VIEW)
INPUT OUTPUT ADJUST
The OUTPUT terminal is in electrical contact with the mounting base.
TO-220AB
I
O
A
KTE PACKAGE
(TOP VIEW)
INPUT OUTPUT ADJUST
The OUTPUT terminal is in electrical contact with the mounting base.
I
O
A
The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317 can function as a precision current regulator. An optional output capacitor can be added to improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators.
The LM317 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
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 Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
DCY PACKAGE
(TOP VIEW)
INPUT
OUTPUT
ADJUST
Copyright 2001, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1
LM317 3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
AVAILABLE OPTIONS
† ‡
schematic diagram
T
J
0°C to 125°C LM317DCY LM317KC LM317KTER The DCY package also is available taped and reeled, e.g., LM317DCYR.
The KTE package has the same footprint as TO-263 and can be mounted on a TO-263 land pattern. The KTE package is only available taped and reeled.
HEAT-SINK
(DCY)
MOUNTED, TO-220
PACKAGED DEVICES
HEAT-SINK
MOUNTED, POWER FLEX
(KC)
PLASTIC FLANGE
(KTE)
INPUT
OUTPUT ADJUST
absolute maximum ratings over virtual junction temperature range (unless otherwise noted)
Input-to-output differential voltage, V Package thermal impedance, θ
– VO 40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(see Notes 1 and 2): DCY package 49°C/W. . . . . . . . . . . . . . . . . . . . . . . . .
JA
§
(see Notes 1 and 3): KC package 25°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Notes 1 and 2): KTE package 23°C/W. . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
§
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), θJA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-5.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
MIN MAX UNIT
VI – VOInput-to-output voltage differential 3 37 V I
O
T
J
Output current 1.5 A Operating virtual junction temperature 0 125 °C
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
LM317
I
(line)
V
V
3 V to 40 V
%/V
ADJ
µ ,
g
I
10 mA to 1500 mA
T
0°C to 125°C
Peak output current
A
Ripple rejection
V
10 V
f
120 HZ
dB
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
electrical characteristics over recommended ranges of operating virtual junction temperature (unless otherwise noted)
PARAMETER
nput voltage
Output voltage (load) regulation
Thermal regulation 20-ms pulse, TJ = 25°C 0.03 0.07 %VO/W ADJUST terminal current 50 100 µA Change in
ADJUST terminal current Reference voltage (V
(OUTPUT to ADJUST) Output-voltage
temperature stability Minimum load current
to maintain regulation
p
Output noise voltage (RMS) f = 10 HZ to 10 kHZ, TJ = 25°C 0.003 %V
pp
Long-term stability TJ = 25°C 0.3 1 %/1k Hrs
Unless otherwise noted, the following test conditions apply: |VI – VO| = 5 V and I used to maintain the junction temperature as close to the ambient temperature as possible.
Input regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
§
C
is connected between the ADJUST terminal and GND.
ADJ
NOTE 4: Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
regulation
)
ref
=
I
O
=
O
VI – VO = 2.5 V to 40 V, PD 20 W , IO = 10 mA to 1500 mA 0.2 5 µA
VI – VO = 3 V to 40 V, PD 20 W , IO = 10 mA to 1500 mA 1.2 1.25 1.3 V
TJ = 0°C to 125°C 0.7 %V
VI – VO = 40 V 3.5 10 mA VI – VO 15 V, PD < P
VI – VO 40 V, PD < P
,
=
O
TEST CONDITIONS
C
= 10 µF§,
TJ = 25°C
=
J
MAX
(see Note 1), TJ = 25°C 0.15 0.4
MAX
=
TJ = 25°C 0.01 0.04 TJ = 0°C to 125°C 0.02 0.07 VO 5 V 25 mV VO 5 V 0.1 0.5 %V VO 5 V 20 70 mV VO 5 V 0.3 1.5 %V
(see Note 1) 1.5 2.2
= 0 µF = 10 µF
§
§
C
ADJ
C
ADJ
= 1.5 A, TJ = 0°C to 125°C. Pulse testing techniques are
OMAX
MIN TYP MAX UNIT
57
62 64
O
O
O
O
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3
LM317 3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
V
I
INPUT
LM317
OUTPUT
V
O
ADJUST
V
= 1.25 V
I
Cin (Note A)
0.1 µF
NOTES: A. Cin is not required if the regulator is close enough to the power-supply filter.
V
out
Since I
B. CO improves transient response, but is not needed for stability.
is calculated as:
V
+
V
out
ref
is typically 50 µA, it is negligible in most applications.
Adj
R2
ǒ
1
)
R1
Ǔ
)
(I
R2)
Adj
Adj
ref
R2
Figure 1. Adjustable Voltage Regulator
LM317
+35 V
INPUT
OUTPUT
ADJUST
R1 120
R1 240
V
O
CO (Note B)
1.0 µF
V
is calculated as:
out
V
out
Since I
Adj
4
C1
0.1 µF
R2)R3
ǒ
+
V
1
)
ref
is typically 50 µA, it is negligible in most applications.
R1
Ǔ
)
I
(R2)R3) – 10 V
Adj
Figure 2. 0-V to 30-V Regulator Circuit
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
–10 V
R3 680
R2 3 k
LM317
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
LM317
C3 1 µF
V
O
V
I
INPUT
C1
0.1 µF
OUTPUT
ADJUST
R1 240
D1 1N4002 (see Note A)
R2 5 k
NOTE A: D1 discharges C2 if the output is shorted to ground.
Figure 3. Adjustable Regulator Circuit With Improved Ripple Rejection
LM317
V
I
OUTPUTINPUT
ADJUST
Figure 4. Precision Current-Limiter Circuit
ADJUST
V
I
INPUT
C1
0.1 µF
OUTPUT
LM317
C2 10 µF
R1 240
C2 1 µF
R1
INPUT
R2
720
LM317
OUTPUT
ADJUST
I
limit
Output
Adjust
1.2
+
R1
V
O
R3 120
R4 1 k
Figure 5. Tracking Preregulator Circuit
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
5
LM317 3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
V
Figure 6. 1.2-V to 20-V Regulator Circuit With Minimum Program Current
INPUT
I
LM317
OUTPUT
ADJUST
V
R1
1.2 k
R2 20 k
O
LM317
V
Minimum load current from each output is 10 mA. All output voltages are within 200 mV of each other.
INPUT OUTPUT
I
ADJUST
V
R1 120
V
O
I
R2 1 k
LM317
INPUT OUTPUT
ADJUST
V
V
O
Figure 7. Adjusting Multiple On-Card Regulators With a Single Control
R
S
LM317
V
INPUT
I
OUTPUT
ADJUST
0.2
(see Note A)
R1 240
R2
2.4 k
INPUT OUTPUT
I
LM317
ADJUST
V
O
NOTE A: RS controls the output impedance of the charger.
R2
Z
OUT
The use of RS allows for low charging rates with a fully charged battery.
ǒ
+
R
S
Ǔ
1
)
R1
Figure 8. Battery-Charger Circuit
6
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
LM317
LM317
V
INPUT
I
OUTPUT
ADJUST
24
Figure 9. 50-mA Constant-Current Battery-Charger Circuit
LM317
V
INPUT
I
2.7 k
OUTPUT
ADJUST
R2
R1 240
2N2905
VO = 15 V
D1 1N4002
R3
50 k
C1 25 µF
Figure 10. Slow Turn-On 15-V Regulator Circuit
12 V
I(PP)
LM317
V
V
INPUT
I
INPUT
I
OUTPUT
ADJUST
ADJUST
OUTPUT
LM317
480
120
Figure 11. AC Voltage-Regulator Circuit
120
480
6 V
O(PP)
2 W (TYP)
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
7
LM317 3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
V
I+
NOTE A: R3 sets the peak current (0.6 A for a 1- resistor).
Figure 12. Current-Limited 6-V Charger Circuit
INPUT
V
I–
ADJUST
LM317
OUTPUT
R1 240
R2
1.1 k
R3 (see Note A)
LM317
V
I
INPUT
INPUT
INPUT
2N2905
OUTPUT
ADJUST
LM317
OUTPUT
ADJUST
LM317
OUTPUT
ADJUST
100
200 pF
TL080
_
+
0.2
0.2
4.5 V to 25 V
0.2
5 k
5 k
150
1.5 k
Figure 13. Adjustable 4-A Regulator Circuit
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
TIP73
LM317
2N2905
V
I
22
10 µF
NOTES: A. The minimum load current is 30 mA.
B. This optional capacitor improves ripple rejection.
5 k
Figure 14. High-Current Adjustable Regulator Circuit
INPUT
LM317
OUTPUT
ADJUST
120
10 µF (see Note B)
500
1N4002
See Note A
V
47 µF
O
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
9
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