LM317
3-TERMINAL ADJUSTABLE REGULATORS
ELECTRICAL CHARACTERISTICS
Uniess otherwise noted ,these specifications apply for the following test conditions: Vi-Vo=5V and Io=0.5A. For conditions
shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PARAMETER
TEST CONDITIONS
Input Regulation*2
Ripple Rejection
Output Regulation
Output Voltage Change With Temperature
Output Voltage long-term Drift*4
Output Noise Voltage
VI-VO=3V to 40V *3
TJ=MIN to MAX
IO=10mA to 1.5A
VO=10V, f=120HZ
VO=10V, f=120HZ
10-µF capacitor between ADJ and ground
IO=10mA TO 1.5A,
TJ=25℃*3,
IO=10mA to 1.5A *3
VO≤5V
VO>5V
VO≥5V
VO>5V
TJ=MIN to MAX
After 1000h at TJ = MAX and VI-VO=40V
f=10Hz to 10kHz, TJ=25℃
Minimum Output
Regulation
Current
to
Maintain VI-VO=40V
Peak Output Current
VI-VO≤15V
VI-VO≤40V, TJ=25
Adjustment-terminal Current
Change in adjustment-terminal Current
Reference Voltage(Output to ADJ)
VI-VO=2.5V to 40V,
IO=10mA to 1.5A
VI-VO=3V to 40V, IO=10mA to 1.5A,
P≤15W
MIN
66
1.5
0.15
1.20
TYP MAX UNIT
0.01
0.02
0.04
0.07
%/V
65
80
dB
5 25 mV
0.1 0.5 %
20 70 mV
0.3 1.5 %
1
%
0.3 1 %
0.003
%
3.5 10 mA
2.2
0.4
A
50 100 µA
0.2 5.0 µA
1.25 1.30 V
*1 All characteristics are measured with a 0.1-µF capacitor across the input and a 1-µF capacitor across the output.
*2 Input regulation is expressed here as the percentage change in output voltage per 1-V change at the input
*3 Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible.
Thermal effects must be taken into account separately.
*4 Since long-term drift cannot be measured on the individual devices prior to shipment. This specification is not intended to be a guarantee or warranty. It
is an engineering estimate of the average drift to be expected from lot to lot.
TYPICAL APPLICATION DATA
REG
VI
IN
OUT
ADJ
R1
240
V0
See Note 3
C1=0.1 F
See Note 1
C2=1 F
R2
See Note 2
Output voltage is calculated from
VO = VREF { 1+
R2
R1
}
1. Use of an input bypass capacitor is recommended if regulator is far from filter capacitors.
2. Use of an output capacitor improves transient response but is optional.
3. VREF equals the difference between the output and adjustment terminal voltages.