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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 VI - VO40V
Operating Junction Temperature Range 0℃
℃℃
℃ to +125℃
℃℃
℃
Continuous total dissipa tion 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, IO10 1500 mA
OPERATING VIRTUAL JUNCTION TEMPERATURE,TJ
070 ℃
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
TJ=MIN to MAX 0.01 0.04
Input Regulation*2 VI-VO=3V to 40V *3 IO=10mA to 1.5A 0.02 0.07 %/V
VO=10V, f=120HZ 65
Ripple Rejection VO=10V, f=120HZ
10-µF capacitor between ADJ and ground 66 80 dB
VO≤5V 5 25 mV
IO=10mA TO 1.5A,
TJ=25℃*3,VO>5V 0.1 0.5 %
VO≥5V 20 70 mV
Output Regulation IO=10mA to 1.5A VO>5V 0.3 1.5 %
Output Voltage Change With Temperature TJ=MIN to MAX 1 %
Output Voltage long-term Drift*4 After 1000h at TJ = MAX and VI-VO=40V 0.3 1 %
Output Noise Voltage f=10Hz to 10kHz, TJ=25℃0.003 %
Minimum Output Current to Maintain
Regulation VI-VO=40V 3.5 10 mA
VI-VO≤15V 1.5 2.2
Peak Output Current VI-VO≤40V, TJ=25 0.15 0.4 A
Adjustment-terminal Current 50 100 µA
Change in adjustment-terminal Current VI-VO=2.5V to 40V,
IO=10mA to 1.5A 0.2 5.0 µA
Reference Voltage(Output to ADJ) VI-VO=3V to 40V, IO=10mA to 1.5A,
P≤15W 1.20 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 th e output.
*2 Input regulation is expressed here as the percentage ch ange in output voltage per 1-V chan ge at the input
*3 P ulse t esti ng techniques are used to mainta in the junction temperature as close to the am bient temp er atur e as possible.
Therma l effects must be taken into ac count separately.
*4 Since long-term drift cannot be measured on the individual devices prior to shipment. This specification is not intend ed to be a guarant ee or warran t y. It
is an engineering est imat e of the aver age dr ift t o 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. VREF equals the difference between the output and adjustment terminal voltages.
OUT
ADJ
REG
IN
R1
240
R2
C2=1 F
C1=0.1 F
VI
V0
VO = VREF { 1+ }
R2
R1
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
POSITIVE ADJUSTABLE REGULATOR
Chip Size: 2.45X1.85mm
PAD LOCATION LM317
COORDINATES µm
PAD N PAD NAM E XY
1 ADJ 2120 410
2 OUTPUT 1730 1490
3 INPUT 1120 950
4 OUTPUT 90 100
330
330330
330
240
240240
240
260
260260
260
240
240240
240
280
280280
280
240
240240
240
265
265265
265
230
230230
230
1
2
3
4
3-TERMINAL ADJUSTABLE REGULATORS
LM317
