LM317LZ-AP STMicroelectronics, LM317LZ-AP Datasheet - Page 9
![IC REG VOLT 1.2-37V LO CURR TO92](/photos/5/48/54888/497-to-92-3_series_sml.jpg)
LM317LZ-AP
Manufacturer Part Number
LM317LZ-AP
Description
IC REG VOLT 1.2-37V LO CURR TO92
Manufacturer
STMicroelectronics
Datasheet
1.LM317LZ-AP.pdf
(18 pages)
Specifications of LM317LZ-AP
Regulator Topology
Positive Adjustable
Voltage - Output
1.2 ~ 37 V
Number Of Regulators
1
Current - Output
100mA
Current - Limit (min)
100mA
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-92-3 (Standard Body), TO-226
Polarity
Positive
Number Of Outputs
1
Output Type
Adjustable
Output Voltage
1.2 V to 37 V
Output Current
500 mA
Line Regulation
0.04 % / V
Load Regulation
0.5 %
Input Voltage Max
5 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Reference Voltage
1.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Input
-
Voltage - Dropout (typical)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-4266-2
497-4266-3
497-4266-3
497-4266-3
497-4266-3
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LM217L/LM317L
Application information
6
Application information
The 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 (see
Figure
4.), giving an output voltage V
of:
O
V
= V
(1 + R
/R
) + I
R
O
REF
2
1
ADJ
2
The device was designed to minimize the term I
(100µA max) and to maintain it very
ADJ
constant with line and load changes. Usually, the error term I
× R
can be neglected. To
ADJ
2
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.
Since the LM317L is a floating regulator and "sees" only the input-to-output differential
voltage, supplies of very high voltage with respect to ground can be regulated as long as the
maximum input-to-output differential is not exceeded. Furthermore, programmable regulator
are easily obtainable and, by connecting a fixed resistor between the adjustment and output,
the device can be used as a precision current regulator. In order to optimize the load
regulation, the current set resistor R
(see
Figure
4.) should be tied as close as possible to
1
the regulator, while the ground terminal of R
should be near the ground of the load to
2
provide remote ground sensing.
9/18