D
D
E
E
S
S
C
C
R
R
I
I
P
P
T
T
I
I
O
O
N
N
The
LM317 are adjustable 3-terminal positive-voltage regulators capable of supplying 1.5A over
a differential voltage range of 3V to 40V. They are exceptionally easy to use and require only two
external resistors to set the output voltage. Both input and output regulation is better than
standard fixed regulators.
In addition to higher performance than fixed regulators, these regulators offer full overload
protection available only in integrated circuits. Included on the chip are current limit, thermal
overload protection, and safe-area protection. All overload protection circuit remains fully
functional even if the adjustment terminal 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.
The primary applications of each of these regulators is that of a programmable output regulator,
but by connecting a fixed resistor between adjustment terminal and the output terminal, each
device can be used as a precision current regulator. Even though the regulator is floating and
sees only the input-to-output differential voltage, use of these devices to regulate output voltages
that would cause the maximum-rated differential voltage to be exceeded if the output became
shorted is not recommended
FEATURES
!
Output Voltage Range Adjustable from 1.2 V to 37V
!
Output Current Capability of 1.5A Max
!
Input Regulation Typically 0.01% Per Input-Volt
Change
!
Output Regulation Typically 0.1%
!
Peak Output Current Constant over Temperature
Range of Regulator
!
Popular 3-Lead TO-220 AB Package
!
Ripple Rejection Typically 80 dB
ABSOLUTE MAXIMUM RATINGS
Input-Output Voltage Differential V
I
- V
O
40V
Operating Junction Temperature Range
0
to +125
Continuous total dissipation at 25
free-air temperature
2000mW
Continuous total dissipation at (or below ) 25
case temperature
15W
Storage Temperature
65
to +150
Lead Temperature1.6 mm from case for 10 seconds
260
RECOMMENDED OPERATING CONDITIONS
MIN MAX UNIT
OUTPUT CURRENT, I
O
10
1500
mA
OPERATING VIRTUAL JUNCTION TEMPERATURE,T
J
0
70
Wing Shing Computer Components Co., (H.K.)Ltd.
Tel:(852)2341 9276 Fax:(852)2797 8153
Homepage:
http://www.wingshing.com
E-mail: wsccltd@hkstar.com
3-TERMINAL ADJUSTABLE REGULATORS
TO-220 PACKAGE
INPUT
OUTPUT
ADJUSTMENT
A
D
I
LM317
LM317T
A
O
I
TO-92
LM317LZ
INPUT
OUTPUT
ADJ
ELECTRICAL CHARACTERISTICS
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
T
J
=MIN to MAX
0.01
0.04
Input Regulation*2
V
I
-V
O
=3V to 40V *3
I
O
=10mA to 1.5A
0.02
0.07
%/V
V
O
=10V, f=120HZ
65
Ripple Rejection
V
O
=10V, f=120HZ
10-F capacitor between ADJ and ground
66
80
dB
V
O
5V
5
25
mV
I
O
=10mA TO 1.5A,
T
J
=25*3,
V
O
>5V
0.1
0.5
%
V
O
5V
20
70
mV
Output Regulation
I
O
=10mA to 1.5A
V
O
>5V
0.3
1.5
%
Output Voltage Change With Temperature
T
J
=MIN to MAX
1
%
Output Voltage long-term Drift*4
After 1000h at T
J
= MAX and VI-VO=40V
0.3
1
%
Output Noise Voltage
f=10Hz to 10kHz, T
J
=25
0.003
%
Minimum Output Current to Maintain
Regulation
V
I
-V
O
=40V
3.5
10
mA
V
I
-V
O
15V
1.5
2.2
Peak Output Current
V
I
-V
O
40V, T
J
=25
0.15
0.4
A
Adjustment-terminal Current
50
100
A
Change in adjustment-terminal Current
V
I
-V
O
=2.5V to 40V,
I
O
=10mA to 1.5A
0.2
5.0
A
Reference Voltage(Output to ADJ)
V
I-
V
O
=3V to 4
0V, IO=10mA to 1.5A,
P15W
1.20
1.25
1.30
V
*1
All characteristics are measured with a 0.1-F capacitor across the input and a 1-F 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
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. V
REF
equals the difference between the output and adjustment terminal voltages.
OUT
ADJ
REG
IN
R
1
240
R
2
C
2
=1 F
C
1
=0.1 F
V
I
V
0
V
O
= V
REF
{ 1+ }
R
2
R
1
3-TERMINAL ADJUSTABLE REGULATORS
See Note 1
See Note 2
See Note 3
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.
*3
Output voltage is calculated from
LM317
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