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TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Output Voltage Range Adjustable From
1.2 V to 32 V When Used With an External
Resistor Divider
D
Output Current Capability of 100 mA
D
Input Regulation Typically 0.01% Per
Input-Voltage Change
D
Output Regulation Typically 0.5%
D
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 1.2 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.
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.
The TL317C is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
T
J
SMALL
OUTLINE
(D)
PLASTIC
(LP)
CHIP
FORM
(Y)
0°C to 125°C TL317CD TL317CLP TL317Y
The D and LP packages are available taped and reeled. Add
the suffix R to device type (e.g., TL317CDR). Chip forms are
tested at 25°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.
1
2
3
4
8
7
6
5
INPUT
OUTPUT
OUTPUT
ADJUSTMENT
NC
OUTPUT
OUTPUT
NC
D PACKAGE
(TOP VIEW)
LP PACKAGE
(TOP VIEW)
NC – No internal connection
OUTPUT terminals are all internally connected.
INPUT
OUTPUT
ADJUSTMENT
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TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematic
11.5 kΩ
124 Ω
200 kΩ
195
Ω
5.3 kΩ 5.7 kΩ 70 Ω 5.1 kΩ
pF
30
pF
30
2.1 k
Ω
2.12 kΩ
10.8 kΩ
40 Ω
ADJUSTMENT
OUTPUT
670 Ω
1.4 Ω
360
Ω
INPUT
310 Ω 5.6 kΩ251 Ω190 Ω310 Ω
NOTE A: All component values shown are nominal.
absolute maximum ratings over operating temperature range (unless otherwise noted)
†
Input-to-output differential voltage, V
l
– VO 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air, TA, case, or virtual-junction temperature range, TJ: TL317C 0°C to 150°C. . . . . . . . . . . .
Package thermal impedance, θJA (see Notes 1 and 2): D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
LP package 156°C/W. . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 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.
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-to-output voltage differential, VI – V
O
35 V
Output current, I
O
2.5 100 mA
Operating virtual-junction temperature, T
J
TL317C 0 125 °C
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TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating virtual-junction temperature range (unless
otherwise noted)
TL317C
PARAMETER
TEST CONDITIONS
†
MIN TYP MAX
UNIT
p
TJ = 25°C 0.01 0.02
Input voltage regulation (see Note 3)
V
I
–
V
O
=
5 V to 35 V
IO = 2.5 mA to 100 mA 0.02 0.05
%V
VO = 10 V, f = 120 Hz 65
Ripple regulation
VO = 10 V,
10-µF capacitor between ADJUSTMENT and ground
66 80
dB
VI = 5 V to 35 V,
VO ≤ 5 V 25 mV
Output voltage regulation
I
O
= 2.5 mA to
100 mA
,
TJ = 25°C
VO ≥ 5 V 5 mV/V
Out ut voltage regulation
V
= 5 V to 35 V,
VO ≤ 5 V 50 mV
I
,
IO = 2.5 mA to 100 mA
VO ≥ 5 V 10 mV/V
Output voltage change with temperature TJ = 0°C to 125°C 10 mV/V
Output voltage long-term drift After 1000 hours at TJ = 125°C and VI – VO = 35 V 3 10 mV/V
Output noise voltage f = 10 Hz to 10 kHz, TJ = 25°C 30 µV/V
Minimum output current to maintain regulation VI – VO = 35 V 1.5 2.5 mA
Peak output current VI – VO ≤ 35 V 100 200 mA
ADJUSTMENT current 50 100 µA
Change in ADJUSTMENT current VI – VO = 2.5 V to 35 V, IO = 2.5 mA to 100 mA 0.2 5 µA
Reference voltage (output to ADJUSTMENT)
VI – VO = 5 V to 35 V,
P ≤ rated dissipation
IO = 2.5 mA to 100 mA,
1.2 1.25 1.3 V
†
Unless otherwise noted, these specifications apply for the following test conditions: VI – VO = 5 V and IO = 40 mA. Pulse-testing techniques must
be used that maintain the junction temperature as close to the ambient temperature as possible. All characteristics are measured with a 0.1-µF
capacitor across the input and a 1-µF capacitor across the output.
NOTE 3: Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
electrical characteristics over recommended operating conditions, TJ = 25°C (unless otherwise
noted)
TL317Y
PARAMETER
TEST CONDITIONS
†
MIN TYP MAX
UNIT
Input voltage regulation (see Note 3) VI – VO = 5 V to 35 V 0.01 %V
VO = 10 V, f = 120 Hz 65
Ripple regulation
VO = 10 V,
10-µF capacitor between ADJUSTMENT and ground
80
dB
p
VO ≤ 5 V 25 mV
Output voltage regulation
I
O
=
2.5 mA to 100 mA
VO ≥ 5 V 5 mV/V
Output noise voltage f = 10 Hz to 10 kHz 30 µV/V
Minimum output current to maintain regulation VI – VO = 35 V 1.5 mA
Peak output current VI – VO ≤ 35 V 200 mA
ADJUSTMENT current 50 µA
Change in ADJUSTMENT current VI – VO = 2.5 V to 35 V, IO = 2.5 mA to 100 mA 0.2 µA
Reference voltage (output to ADJUSTMENT)
VI – VO = 5 V to 35 V,
P ≤ rated dissipation
IO = 2.5 mA to 100 mA,
1.25 V
†
Unless otherwise noted, these specifications apply for the following test conditions: VI – VO = 5 V and IO = 40 mA. Pulse-testing techniques must
be used that maintain the junction temperature as close to the ambient temperature as possible. All characteristics are measured with a 0.1-µF
capacitor across the input and a 1-µF capacitor across the output.
NOTE 3: Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
Page 4
TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 1. Adjustable Voltage Regulator
C1 = 0.1 µF
(see Note A)
V
I
470 Ω
R1
R2
C2 = 1 µF
(see Note C)
V
O
(see Note B)
Adjustment
OutputInput
TL317
NOTES: A. Use of an input bypass capacitor is recommended if
regulator is far from the filter capacitors.
B. Output voltage is calculated from the equation:
where: V
ref
equals the difference between OUTPUT and
ADJUSTMENT voltages (≈1.25 V).
C. Use of an output capacitor improves transient response
but is optional.
V
O
+
V
ref
ǒ
1
)
R2
R1
Ǔ
Figure 2. 0-V to 30-V Regulator Circuit
V
O
(see Note A)
R2 = 3 kΩ
1N4002
R3 =
820 Ω
–10 V
C1 = 0.1 µF
35 V
Adjustment
OutputInput
TL317
NOTE A: Output voltage is calculated from the equation:
where: V
ref
equals the difference between OUTPUT
and ADJUSTMENT voltages (≈1.25 V).
R1 = 120 Ω
V
O
+
V
ref
ǒ
1
)
R2)R3
R1
Ǔ
*
10 V
Figure 3. Regulator Circuit
With Improved Ripple Rejection
R1 =
470 Ω
D1
†
1N4002
C3 = 1 µF
C2 = 10 µF
R2 =
10 kΩ
V
I
+
+
–
–
Adjustment
OutputInput
TL317
†
D1 discharges C2 if output is shorted to ground.
NOTE A: Use of an output capacitor improves transient response but is
optional.
V
O
(see Note A)
C1 =
0.1 µF
Figure 4. Precision Current-Limiter Circuit
V
I
R1
Adjustment
OutputInput
TL317
I
limit
+
1.25
R1
Page 5
TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 5. Tracking Preregulator Circuit
R3 =
240 Ω
V
I
C1 = 0.1 µF
C2 = 1 µF
Output
Adjust
V
O
R2 = 1.5 kΩ
R1 = 470 Ω
TL317
R4 =
2 kΩ
Adjustment
OutputInput
TL317
Adjustment
OutputInput
Figure 6. Slow Turnon 15-V Regulator Circuit
R1 =
470 Ω
R2 = 5.1 kΩ
C1 = 25 µF
2N2905
R3 = 50 kΩ
1N4002
VO = 15 V
V
I
TL317
Adjustment
OutputInput
Figure 7. 50-mA Constant-Current
Battery Charger Circuit
V
I
24 Ω
TL317
Adjustment
OutputInput
Figure 8. Current-Limited 6-V Charger
1.1 kΩ
240 Ω
V–
V
I
TL317
Adjustment
OutputInput
I
CHG
R
+
V
BE
I
CHG
V
BE
Page 6
TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
500 Ω
V
O
47 µF
1N4002
120 Ω
10 µF
‡
10 µF
5 kΩ
22 Ω
5 kΩ
2N2905
TIP73
V
I
R
L
†
TL317
Adjustment
OutputInput
†
Minimum load current is 30 mA.
‡
Optional capacitor improves ripple rejection
Figure 9. High-Current Adjustable Regulator
Page 7
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Copyright 1999, Texas Instruments Incorporated
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