Features: · OUTPUT VOLTAGERANGE : 1.2 TO 37V
· OUTPUT CURRENT IN EXCESSOF 1.5A
· 0.1% LINE AND LOAD REGULATION
· FLOATINGOPERATION FOR HIGH VOLTAGES
· COMPLETE SERIES OF PROTECTIONS :
CURRENT LIMITING, THERMAL
SHUTDOWN AND SOA CONTROLPinout
Specifications
| Output Current |
1500, 500 mA |
| Output Voltage |
Undefined Volt |
| Input Min Voltage |
4.2 Volt |
| Input Max Voltage |
40 Volt |
| Adjustable Output |
Yes |
| On/Off Pin |
No |
| Error Flag |
No |
| Temperature Min |
-55 deg C |
| Temperature Max |
125, 150 deg C |
| RegType |
Linear Regulator |
| View Using Catalog |
| Symbol |
Parameter |
Value |
Unit |
| Vi-o |
Input-output Differential Voltage |
40 |
V |
| IO |
Output Current |
Internally limited |
|
| Top |
Operating Junction Temperature for: LM117
LM217
LM317 |
-55 to 150
-25 to 150
0 to 125 |
|
| Ptot |
Power Dissipation |
Internally limited |
|
| Tstg |
Storage Temperature |
65 to + 150 |
|
DescriptionThe 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 LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see LM137 series data sheet.
Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-181: Application Note 181 3-Terminal Regulator Is Adjustable |
165 Kbytes |
1-May-04 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-242: Application Note 242 Applying a New Precision Op Amp |
383 Kbytes |
4-Oct-04 |
Download |
| AN-241: Application Note 241 Working with High Impedance Op Amps |
130 Kbytes |
4-Oct-04 |
Download |
| AN-97: Application Note 97 Versatile Timer Operates from Microseconds to Hours |
457 Kbytes |
24-Feb-99 |
Download |
| AN-79: Application Note 79 IC Preamplifier Challenges Choppers on Drift |
380 Kbytes |
1-Oct-02 |
Download |
| AN-182: Application Note 182 Improving Power Supply Reliability with IC Power Regulators |
27 Kbytes |
3-Oct-02 |
Download |
| AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise |
399 Kbytes |
1-Oct-02 |
Download |
| AN-298: Application Note 298 Isolation Techniques for Signal Conditioning |
379 Kbytes |
2-Oct-02 |
Download |
| AN-173: Application Note 173 IC Zener Eases Reference Design |
54 Kbytes |
1-Oct-02 |
Download |
| AN-240: Application Note 240 Wide-Range Current-to-Frequency Converters |
126 Kbytes |
3-Oct-02 |
Download |
| AN-178: Application Note 178 Applications for an Adjustable IC Power Regulator |
40 Kbytes |
3-Oct-02 |
Download |
| AN-260: Application Note 260 A 20-Bit (1 ppm) Linear Slope-Integrating A/D Converter |
148 Kbytes |
3-Oct-02 |
Download |
| AN-56: 1.2 Volt Reference |
116 Kbytes |
4-Nov-95 |
Download |
AN-56 (Chinese): 1.2 Volt Reference
|
291 Kbytes |
|
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-A: The Monolithic Operational Amplifier: A Tutorial Study |
342 Kbytes |
4-Nov-95 |
Download |
| AN-41: Application Note 41 Precision IC Comparator Runs from +5V Logic Supply |
150 Kbytes |
2-Oct-02 |
Download |
| AN-110: Application Note 110 Fast IC Power Transistor with Thermal Protection |
333 Kbytes |
3-Oct-02 |
Download |
| AN-271: Application Note 271 Applying the New CMOS MICRO-DAC |
230 Kbytes |
4-Oct-04 |
Download |
AN-271 (Japanese): Application Note 271 Applying the New CMOS MICRO-DAC
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
342 Kbytes |
|
|
| AN-46: The Phase Locked Loop IC as a Communication System Building Block |
277 Kbytes |
4-Nov-95 |
Download |
| AN-299: Application Note 299 Audio Applications of Linear Integrated Circuits |
232 Kbytes |
24-Feb-99 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
LM117 Data Sheet
