U T C LM317L LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R101-008,A
LOW CURRENT 1.25V TO 37V
ADJUSTABLE VOLTAGE
REGULATOR
DESCRIPTION
The UTC LM317L is a monolithic integrated
circuit, designed for use as positive adjustable voltage
regulator. It is designed to supply until 100mA of load
current with an output voltage adjustable over a 1.25V
to 37V range.
FEATURES
*Output voltage range: 1.25V to 37V
*Output current in excess of 100mA
*Line regulation typ. 0.01%
*Load regulation typ. 0.1%
*Thermal overload protection
*Short circuit protection
*Output transistor safe area compensation
*Floating operation for high voltage applications
TO-92
1
SOP-8
PIN CONFIGURATIONS
1
2
3
4
8
7
6
5
NC
V
OUT
V
OUT
V
IN
UTC
LM317L
ADJ
V
OUT
V
OUT
NC
3
ADJUST
OUT
IN
2
1
TO-92 Plastic Package
Bottom View
SOP-8 PACKAGE
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VALUE
UNIT
Input-Output Differential Voltage
Vi-Vo
40
V
Power Dissipation
Pd
Internally Limited
Operating Junction Temperature Range
Topr
0~125
C
Storage Temperature Range
Tstr
-55 ~ 150
C
U T C LM317L LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R101-008,A
SCHEMATIC DIAGRAM
TEST CIRCUIT
R1
R2
R3
R4
R5
R6
Q4
Q3
Q5
Q8
R7
Q6
R8
Q9
Q7
R9
R10 R11 R12
Q11 Q12
R13
Q13
Q14
Q15
Q17
Q16
R15
Q10
Q19
Q18
Q20
Q21
R16
C3
R20
R21
R17
R19
R18
Q25
R25
Q26
R26
D2
R23
D3
R24
OUTPUT
R14
R22
INPUT
Q1
D1
Q2
ADJUST
Q22
C1
C2
LM317L
Vi
Vo
3
2
1
Vref
R1
R2
Iadj
Cin
0.1
F
Cout
1
F
U T C LM317L LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R101-008,A
ELECTRICAL CHARACTERISTICS
(Vi-Vo=5V, Io=40mA, 0<=Tj<=125
C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Line Regulation
Vo
Vi-Vo=3~40V
I
L
<20mA
Tj=25
C
0.01
0. 04
%/V
0.02
0.07
%/V
Load Regulation
Vo
Vo<=5V
Io=5~100mA
Tj=25
C
5
25
mV
20
70
mV
Vo>=5V
Io=5~100mA
Tj=25
C
0.1
0.5
%
0.3
1.5
%
Adjustment Pin Current
I
ADJ
50
100
A
Adjustment Pin Current
I
ADJ
Vi-Vo=3~40V
Io=5~100mA, Pd< 625 mW
0.2
5
A
Reference Voltage
V
REF
Vi-Vo=3~40V
Io=5~100 mA , Pd< 625 mW
1.2
1.25
1.3
V
Output Voltage Temperature Stability
Vo/Vo
0.7
%
Minimum Load Current
Io(min)
Vi-Vo=40V
3.5
5
mA
Maximum Output Current
Io(max)
Vi-Vo=3~13V
Vi-Vo=40V
100
200
50
mA
Output Noise Voltage
(Percentance of Vo)
eN
B=10Hz~10KHz
Tj=25
C
0.003
%
Supply Voltage Rejection(*)
SVR
Tj=25
C
f=120Hz
C
ADJ
=0
65
dB
C
ADJ
=10
F
66
80
dB
(*) CADJ is connected between Adjust pin and Ground.
100
200
300
I
0
(mA)
0
10
20
30
VI
N
-V
OUT
(V)
Tj=25
X
C
CURRENT LIMIT
I
0
(mA)
0
10
20
30
VI
N
-V
OUT
(V)
Tj=25
X
C
MINIMUM OPERATING CURRENT
0.5
1.0
1.5
2.0
2.5
3.0
U T C LM317L LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R101-008,A
APPLICATION INFORMATION
The UTC LM317L provides an internal reference voltage of 1.25V between the output and adjustments terminals.
This is used to set a constant current flow across an external resistor divider, giving an output voltage VO of:
VO=V
REF
(1+R2/R1) + I
ADJ
R2
The device is designed to minimize the term I
ADJ
(100
A max) and to maintain it very constant with line and load
changes. Usually, the error term IADJ. R2 can be neglected. To obtain the previous requirement, all the regulator
quiescent current is returned to the output terminal, imposing a minimum load current condition. If the load is
insufficient, the output voltage will rise. The UTC LM317L is a floating regulator, input-output differential voltage,
supplies of very high voltage with respect to ground can be regulated as long as the maximum input-output differential
is not exceeded. Furthermore, programmable regulators are easily obtainable and, by connecting a fixed resistor
between the adjustment and output, the device can be used as a precision current regulator.
LM317L
Vi
Vo
3
2
1
Vref
R1
R2
Iadj
I1
BASIC ADJUSTABLE REGULATOR
U T C LM317L LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R101-008,A
Io=
Vref
R1
+ I
ADJ
1.25V
R1
LM317L
Vi
3
2
1
R1
240
DIGITAL INPUTS(R2 sets maximun Vo)
Vo
R2
DIGITALLY SELECTED OUTPUTS
LM317L
Vi
Vo
3
2
1
R1
Io
I
ADJ
CURRENT REGULATOR
LM317L
Vi
0.1
F
25
F
Vo=15V
3
2
1
R3
R2
R1
C1
C2
2.7K
240
2N2907
50K
D1
1N4001
SLOW TURN-ON 15V REGULATOR
LM317L
Vi
0.1
F
Vo=5V
3
2
1
R2
R1
TTL
INPUT
C1
720
240
7V to
35V
0.1
F
C2
2N2219
5V ELECTRONIC SHUT-DOWN REGULATOR
LM317L
Vi
0.1
F
1
F
Vo
3
2
1
R1
R2
ADJ
D1
1N4001
1N4001
D2
C3
C1
5K
10
F
C2
240
VOLTAGE REGULATOR WITH PROTECTION DIODES
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