HomedatasheetLM317H

LM317H Datasheet

Linear Regulators - Standard
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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 ICs. 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 LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see LM137 series data sheet. LM317H 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 LM317H Applications • Automotive and Transportation• Communications and Telecom• Computers and Peripherals• Consumer Electronics• Energy and Lighting• Industrial• Medical• Security• Space, Avionics and Defense• Video and Imaging
Features

Parameters

[{"Name":"Polarity","Value":"Positive"},{"Name":"Output Voltage","Value":"1.2 V to 37 V"},{"Name":"Output Current","Value":"0.5 A"},{"Name":"Load Regulation","Value":".005"},{"Name":"Input Voltage MAX","Value":"40 V"},{"Name":"Line Regulation","Value":"0.04 % / V"},{"Name":"Maximum Operating Temperature","Value":"+ 125 C"},{"Name":"Mounting Style","Value":"Through Hole"},{"Name":"Package / Case","Value":"TO-39"},{"Name":"Input Voltage MIN","Value":"4.2 V"}]

Manufacturer information

DIODES INCORPORATED

Diodes Incorporated is a leading global manufacturer and supplier of high-quality, application-specific, standard products within the broad discrete, logic and analog semiconductor markets. Diodes Incorporated primarily serves the computing, consumer, communications, industrial and automotive segments. Diodes’ diverse product portfolio includes parts for LCD/LED TVs and displays, desktop, notebook and tablet computing, smartphones and hand-held devices, set-top boxes, power supplies and USB protection as well as many other application areas.

Diodes Incorporated offers a wide array of products including diodes, rectifiers, transistors, MOSFETs, gate drivers, protection devices, function-specific arrays, amplifiers and comparators, Hall-effect sensors and temperature sensors, power management devices including LED drivers, AC-DC converters and controllers, DC-DC switching regulators, linear voltage regulators, current monitors, and voltage reference and shunt regulators, along with special function devices including USB power switches, load switch devices, voltage supervisors and motor controllers.


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