Datasheet
LM317
www.ti.com
SLVS044V –SEPTEMBER 1997–REVISED FEBRUARY 2013
Recommended Operating Conditions
MIN MAX UNIT
V
I
– V
O
Input-to-output differential voltage 3 40 V
I
O
Output current 1.5 A
T
J
Operating virtual junction temperature 0 125 °C
Electrical Characteristics
over recommended ranges of operating virtual junction temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS
(1)
MIN TYP MAX UNIT
T
J
= 25°C 0.01 0.04
Line regulation
(2)
V
I
– V
O
= 3 V to 40 V %/V
T
J
= 0°C to 125°C 0.02 0.07
V
O
≤ 5 V 25 mV
C
ADJ
= 10 μF,
(3)
T
J
= 25°C
V
O
≥ 5 V 0.1 0.5 %V
O
Load regulation I
O
= 10 mA to 1500 mA
V
O
≤ 5 V 20 70 mV
T
J
= 0°C to 125°C
V
O
≥ 5 V 0.3 1.5 %V
O
Thermal regulation 20-ms pulse, T
J
= 25°C 0.03 0.07 %V
O
/W
ADJUST terminal current 50 100 μA
Change in
V
I
– V
O
= 2.5 V to 40 V, P
D
≤ 20 W, I
O
= 10 mA to 1500 mA 0.2 5 μA
ADJUST terminal current
Reference voltage V
I
– V
O
= 3 V to 40 V, P
D
≤ 20 W, I
O
= 10 mA to 1500 mA 1.2 1.25 1.3 V
Output-voltage
T
J
= 0°C to 125°C 0.7 %V
O
temperature stability
Minimum load current
V
I
– V
O
= 40 V 3.5 10 mA
to maintain regulation
V
I
– V
O
≤ 15 V, P
D
< P
MAX
(4)
1.5 2.2
Maximum output current A
V
I
– V
O
≤ 40 V, P
D
< P
MAX
(4)
, T
J
= 25°C 0.15 0.4
RMS output noise voltage
f = 10 Hz to 10 kHz, T
J
= 25°C 0.003 %V
O
(% of V
O
)
C
ADJ
= 0 μF
(3)
57
Ripple rejection V
O
= 10 V, f = 120 Hz dB
C
ADJ
= 10 μF
(3)
62 64
Long-term stability T
J
= 25°C 0.3 1 %/1k hr
(1) Unless otherwise noted, the following test conditions apply: |V
I
– V
O
| = 5 V and I
OMAX
= 1.5 A, T
J
= 0°C to 125°C. Pulse testing
techniques are used to maintain the junction temperature as close to the ambient temperature as possible.
(2) Line regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
(3) C
ADJ
is connected between the ADJUST terminal and GND.
(4) Maximum power dissipation is a function of T
J
(max), θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient
temperature is P
D
= (T
J
(max) – T
A
)/θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
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