Replacement of
LM317
MIK317
1.5 A Positive Adjustable
Voltage Regulator
January 1995 - revised September 2002
Description
The MIK317 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 are 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 circuitry 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 to ground is not recommended.
Features
ћ Output Voltage Range Adjustable from 1.2 V to 37 V
ћ Output Current Capability of 1.5 A Max
ћ Input Regulation Typically 0.01 % Per Input - Volt Change
ћ Output Regulation Typically 0.1 %
ћ Peak Output Current Constant Over Temperature Range
of Regulator
ћ Popular 3-Lead TO-220 Package
ћ Ripple Rejection Typically 80 dB
Package Information
The output terminal is in electrical
contact with the mounting base
Typical application data
MIK317
1
2
3
IN
OUT
ADJ
V
V
I
0
C1 = 0.1 F
(see Note A)
C2 = 1 F
(see Note B)
R1
240
R2
(see Note C)
Note A: Use of an input bypass capacitor is recommended if regulator is far from filter capacitors.
Note B: Use of an output capacitor improves transient response but is optional.
Note C: Output voltage is calculated from the equation:
+
=
1
2
0
1
R
R
V
ref
V
V
ref
equals the difference between the output and adjustment terminal voltages
Absolute Maximum Ratings
OVER OPERATING TEMPERATURE RANGE (UNLESS OTHERWISE NOTED)
Parameter Maximum
Units
Input-to-output differential voltage, V
I
- Vo
40
V
Continuous total dissipation at 25 њC free-air temperature
2
W
Continuous total dissipation at (or below) 25
њC case temperature
15 W
Operating free-air, case, or virtual junction temperature range
0 to 125
њC
Storage temperature range
-65 to 150
њC
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds
260
њC
Recommended Operating Conditions
MIK317 Units
Parameter
min max
Output current, I
0
10
1500
mA
Operating virtual junction temperature, T
J
0
125
њC
Page 1 of 2
Replacement of
LM317
MIK317
1.5 A Positive Adjustable
Voltage Regulator
January 1995 - revised September 2002
Electrical Characteristics
Electrical Characteristics over recommended ranges of operating virtual junction temperature (unless otherwise noted) (Note 1)
MIK317 Units
Parameter Test
Conditions*
Min Typ Max
TJ = MIN to MAX
0.01 0.04 %/ V
Input regulation (Note 2)
V
I
-V
0
=3 V to 40 V,
(Note 3)
l
0
= 10 mA to 1.5 A
0.02 0.07
Vo=10 V, f=120 Hz
65
dB
Ripple rejection
Vo=10 V, f=120 Hz
10-F capacitor between ADJ and ground
66 80
Vo
PDF 
ZIP