Part # LM117QML datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM117QML 3-Terminal Adjustable Regulator


Part Details:

LM1 June 2006 17QML LM117QML 3-T 3-Terminal Adjustable Regulator erminal General Description "floating" and sees only the input-to-output differential volt-age, supplies of several hundred volts can be regulated as The LM117 series of adjustable 3-terminal positive voltage long as the maximum input to output differential is not ex- regulators is capable of supplying either 0.5A or 1.5A over a ceeded, i.e., avoid short-circuiting the output. 1.2V to 37V output range. They are exceptionally easy to Also, it makes an especially simple adjustable switching use and require only two external resistors to set the output regulator, a programmable output regulator, or by connecting Adjustable voltage. Further, both line and load regulation are better than a fixed resistor between the adjustment pin and output, the standard fixed regulators. LM117 can be used as a precision current regulator. Sup- In addition to higher performance than fixed regulators, the plies with electronic shutdown can be achieved by clamping LM117 series offers full overload protection available only in the adjustment terminal to ground which programs the out- IC s. Included on the chip are current limit, thermal overload put to 1.2V where most loads draw little current. protection and safe area protection. All overload protection For the negative complement, see LM137 series data sheet. circuitry remains fully functional even if the adjustment ter-minal is disconnected. Regulator Features Normally, no capacitors are needed unless the device issituated more than 6 inches from the input filter capacitors in n Available with Radiation Guarantee which case an input bypass is needed. An optional output n Guaranteed max. 0.3% load regulation (LM117) capacitor can be added to improve transient response. The n Guaranteed 0.5A or 1.5A output current adjustment terminal can be bypassed to achieve very high n Adjustable output down to 1.2V ripple rejection ratios which are difficult to achieve with stan- n Current limit constant with temperature dard 3-terminal regulators. n 80 dB ripple rejection Besides replacing fixed regulators, the LM117 is useful in a n Output is short-circuit protected wide variety of other applications. Since the regulator is Ordering Information NS Part Number JAN Part Number NS Package Number Package Description LM117E/883 E20A


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LM117QML.pdf Datasheet