LM317AT

Semiconductors - ICs

> Power Management ICs - PMIC

> Voltage Regulators

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Series Information for LM317AT - Texas Instruments

Features

  • feature
    1% Output Voltage Tolerance
  • feature
    1.5-A Output Current
  • feature
    80-dB Ripple Rejection
  • feature
    Adjustable Output Down to 1.25 V
  • feature
    Current Limit Constant with Temperature
  • feature
    Short-Circuit Protected Output
  • feature
    Typical 0.005%/V Line Regulation
  • feature
    u221240u00b0C to 125u00b0C Operating Temperature Range

Description

V REG ADJ +1.2/37V TO-220-3 317
The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. The LM317A device is available in an SOT-223 package, which makes it ideal for space-constrained applications that require high-performance regulation. The device is exceptionally easy to use and requires only two external resistors to set the output voltage. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators. The LM317A offers full overload protection such as current limit, thermal-overload protection, and safearea protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Typically, 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 that are difficult to achieve with standard 3-terminal regulators. Because the LM317A regulator is floating and detects 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. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also 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 1.25 V where most loads draw little current. For applications requiring greater output current, see data sheets for LM150 series (3A), SNVS772, and LM138 series (5A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

Specifications

Output Type:
Adjustable
Input Voltage Min:
4.2V
Input Voltage Max:
40V
Fixed Output Voltage Nom.:
-
Adjustable Output Voltage Min:
1.2V
Adjustable Output Voltage Max:
37V
Output Current:
1.5A
Linear Regulator Case Style:
TO-220
No. of Pins:
3Pins
Operating Temperature Min:
-40°C
Operating Temperature Max:
125°C
Product Range:
-
Automotive Qualification Standard:
-
MSL:
-
SVHC:
No SVHC (27-Jun-2018)
Accuracy %:
1%
Base Number:
317
Device Marking:
LM317AT
IC Generic Number:
317
No. of Outputs:
1Outputs
Operating Temperature Range:
-40°C to +125°C
Operating Voltage Tolerance +:
1%
Output Current Max:
1.5A
Output Voltage Adjustable Range:
1.2V to 37V
Output Voltage Max:
37V
Output Voltage Min:
1.2V
Primary Input Voltage:
40V
Supply Voltage Min:
3V
Voltage Regulator Type:
Positive Adjustable

Alternate Descriptions

Avnet Europe

LDO Regulator Pos 1.2V to 37V 1.5A 3-Pin(3+Tab) TO-220 Rail

Avnet Europe product