U T C LM317L LINEAR INTEGRATED CIRCUIT
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
PIN CONFIGURATIONS
3
21
ADJUST
TO-92 Plastic Package
Bottom View
OUT
IN
1
VIN
2
VOUT
VOUT
ADJ
LM317L
3
4
SOP-8 PACKAGE
UTC
SOP-8
1
TO-92
8
NC
VOUT
7
VOUT
6
5
NC
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
UTC UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R101-008,A
U T C LM317L LINEAR INTEGRATED CIRCUIT
SCHEMATIC DIAGRAM
INPUT
R16
Q22
D2
R19
Q25
R17
R21
C3
R20
R18
R22
Q26
R23
D3
R24
R25
R26
OUTPUT
ADJUST
R1 R2 R3 R4 R5
Q1
Q2
R6 Q4
D1
Q3
Q8
R7Q6R8
Q9
Q7
Q5
R10 R11 R12
R9
Q10
Q11 Q12
Q13
R13
Q15
Q14
C1
Q18
Q16
Q17
C2
Q20
Q19
Q21
R15
R14
TEST CIRCUIT
Vi Vo
3 2
LM317L
R1
Cout
1µF
Cin
0.1µF
1
Vref
Iadj
R2
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R101-008,A
U T C LM317L LINEAR INTEGRATED CIRCUIT
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
IL<20mA
Load Regulation ∆Vo Vo<=5V
Adjustment Pin Current IADJ 50 100 µA
Adjustment Pin Current ∆IADJ Vi-Vo=3~40V
Reference Voltage VREF Vi-Vo=3~40V
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
Output Noise Voltage
(Percentance of Vo)
Supply Voltage Rejection(*) SVR Tj=25°C
(*) CADJ is connected between Adjust pin and Ground.
eN B=10Hz~10KHz
Io=5~100mA
Vo>=5V
Io=5~100mA
Io=5~100mA, Pd< 625 mW
Io=5~100 mA , Pd< 625 mW
Vi-Vo=40V
f=120Hz
Tj=25°C
Tj=25°C 5 25 mV
Tj=25°C 0.1 0.5 %
Tj=25°C
CADJ=0 65 dB
CADJ=10µF 66 80 dB
0.01 0. 04 %/V
0.02 0.07 %/V
20 70 mV
0.3 1.5 %
0.2 5 µA
1.2 1.25 1.3 V
100 200
50
0.003 %
mA
I0
(mA)
300
200
100
0 10 20 30 VIN-VOUT(V)
CURRENT LIMIT
Tj=25¢XC
MINIMUM OPERATING CURRENT
I0
(mA)
3.0
2.5
2.0
1.5
1.0
0.5
0 10 20 30 VIN-VOUT(V)
Tj=25¢XC
UTC UNISONIC TECHNOLOGIES CO., LTD. 3
QW-R101-008,A
U T C LM317L LINEAR INTEGRATED CIRCUIT
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=VREF (1+R2/R1) + IADJ R2
The device is designed to minimize the term IADJ (100µA 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.
BASIC ADJUSTABLE REGULATOR
Vi Vo
3 2
LM317L
1
Vref
Iadj
R1
I1
R2
UTC UNISONIC TECHNOLOGIES CO., LTD. 4
QW-R101-008,A
U T C LM317L LINEAR INTEGRATED CIRCUIT
VOLTAGE REGULATOR WITH PROTECTION DIODES
1N4001
D1
Vi
3 2
LM317L
1
C1
0.1µF
5K
Ω
SLOW TURN-ON 15V REGULATOR
Vi
3
C2
0.1µF
2.7K
LM317L
1
R2
Ω
2
2N2907
R1
240
Ω
R3
50K
Ω
5V ELECTRONIC SHUT-DOWN REGULATOR
Vi
7V to
35V
3
C1
0.1µF
LM317L
1
2
R1
240
Ω
ADJ
R2
Vo=15V
D1
1N4001
C1
25µF
C2
0.1µF
1N4001
Vo=5V
Vo
240
Ω
R1
D2
C3
C2
10µF
1µF
CURRENT REGULATOR
Vi
3 2
LM317L
1
Io=
Vref
R1
+ I
ADJ
≅
1.25V
R1
DIGITALLY SELECTED OUTPUTS
Vi 3 2
LM317L
1
Vo
R1 Io
I
ADJ
R1
240
Vo
Ω
R2
720Ω
2N2219
TTL
INPUT
R2
DIGITAL INPUTS(R2 sets maximun Vo)
UTC UNISONIC TECHNOLOGIES CO., LTD. 5
QW-R101-008,A
Loading...