Part # LM117JAN datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM117JAN 3-Terminal Adjustable Regulator

Part Details:

LM1 March 2006 17JAN LM117JAN 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 adjustable 3-terminal positive voltage regulator long as the maximum input to output differential is not ex- is capable of supplying either 0.5A or 1.5A over a 1.2V to ceeded, i.e., avoid short-circuiting the output. 37V output range. It is exceptionally easy to use and re- Also, it makes an especially simple adjustable switching quires only two external resistors to set the output voltage. Adjustable regulator, a programmable output regulator, or by connecting Further, both line and load regulation are better than stan- a fixed resistor between the adjustment pin and output, the dard 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 Guaranteed 0.5A or 1.5A output current which case an input bypass is needed. An optional output n Adjustable output down to 1.2V capacitor can be added to improve transient response. The n Current limit constant with temperature adjustment terminal can be bypassed to achieve very high n 80 dB ripple rejection ripple rejection ratios which are difficult to achieve with stan- n Output is short-circuit protected dard 3-terminal regulators. Besides replacing fixed regulators, the LM117 is useful in awide variety of other applications. Since the regulator is Ordering Information NS Part Number JAN Part Number NS Package Number Package Description JL117BXA JM38510/11703BXA H03A 3LD T0­39 Metal Can JL117SXA

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LM117JAN.pdf Datasheet