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LM317AT

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Description

3-Terminal Adjustable Regulator

Not found, similar datasheet recommended

ECAD Module
Series: -
Brand: Ns/st
DateCode: 18+
Package / Case: TO-220
Packaging: Tube
Part Status: Not For New Designs
Output Configuration: Positive
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): 40V
Voltage - Output (Min/Fixed): 1.25V
Voltage - Output (Max): 37V
Voltage Dropout (Max): -
Current - Output: 1.5A
Current - Quiescent (Iq): 10mA
PSRR: 80dB ~ 65dB (120Hz)
Control Features: -
Protection Features: Over Temperature, Short Circuit
Operating Temperature: -40°C ~ 125°C
Mounting Type: Through Hole
Supplier Device Package: TO-220-3

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ECAD Module

Product Attributes

Description: The LM317AT is a three-terminal adjustable voltage regulator with a wide input voltage range of 3V to 40V. It is capable of supplying up to 1.5A of output current. Features: Wide input voltage range: 3V to 40V Output voltage range: 1.2V to 37V Output current up to 1.5A Internal thermal overload protection Internal short-circuit current limiting Output voltage trimming Applications: Battery-powered systems Automotive systems Portable equipment Power supplies Voltage regulation (For reference only)

General Description

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range.They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also,the LM117 is packaged in standard transistor packages which are easily mounted and handled.

In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's.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 more than 6 inches 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 adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output,the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. For applications requiring greater output current, see LM150series (3A) and LM138 series (5A) data sheets. For thenegative complement, see LM137 series data sheet.

Features

● Guaranteed 1% output voltage tolerance (LM317A)

● Guaranteed max.0.01%/V line regulation (LM317A)

● Guaranteed max.0.3% load regulation (LM117)

● Guaranteed 1.5A output current

● Adjustable output down to 1.2V

● Current limit constant with temperature

● P+ Product Enhancement tested

● 80 dB ripple rejection

● Output is short-circuit protected

Preview of the first 3 pages of the data sheet

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Product Reviews

Submit

10000 buyer reviews from United States

Elif Cakmak

LM317AT

Turkey istanbul

Length of registration:5 years

Very satisfied with

Reply0

04/22/2018

David Thomas

LM317AT/NOPB

United States

Length of registration:7 years

The LM317AT/NOPB is a great integrated circuit for voltage regulation. It is easy to use and provides reliable performance. The adjustable output voltage range is wide and the current limit is adjustable. The thermal shutdown feature is also a great feature that helps protect the circuit from overheating. Overall, the LM317AT/NOPB is a great integrated circuit for voltage regulation.

Reply0

03/17/2023

See all reviews >>

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Alternate Names

LM317AT

LM317AT has several brands around the world that may have alternate names for LM317AT due to regional differences or acquisition. LM317AT may also be known as the following names: