LM117 (正在供货)


具有短路保护功能的扩展级温度可调节线性稳压器 - LM117


  • LM2941  -  Lower Dropout Voltage, +/- Transient Protection


The LM117 and LM317-N series of adjustable 3-pin positive voltage regulators are capable of supplying in excess of 1.5 A over a 1.25-V to 37-V output range and a wide temperature 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.

The LM117 and LM317-N offer full overload protection such as current limit, thermal overload protection and safe area 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 regulator is 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. That is, avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N 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 (3 A), SNVS772, and LM138 series (5 A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.


  • Typ. 0.1% Load Regulation
  • Typ. 0.01%/V Line Regulation
  • 1.5-A Output Current
  • Adjustable Output Down to 1.25 V
  • Current Limit Constant With Temperature
  • 80-dB Ripple Rejection
  • Short-Circuit Protected Output
  • −55°C to 150°C Operating Temperature
    Range (LM117)


参数 与其它产品相比 单通道 LDO

Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
Noise (uVrms)
PSRR @ 100KHz (dB)
Output Capacitor Type
Operating Temperature Range (C)
LM117 LM317-N LM317A LM317HV LM317L-N
1.5    1.5    1.5    1.5    0.1   
Adjustable Output    Adjustable Output    Adjustable Output    Adjustable Output    Adjustable Output   
4.2    4.2    4.2    4.2    4.2   
40    40    40    60    40   
1.25    1.2    1.2    1.25    1.2   
37    37    37    57    38   
5    3.5    0.05    0.05    0.05   
1200    2250    2250    2250    1800   
4    5    5    5    3   
75    35    38    1710    38   
40    40    40    40    63   
Non-Ceramic    Non-Ceramic    Non-Ceramic    N/A    N/A   
-55 to 125
-55 to 150   
0 to 125    -40 to 125    0 to 125    -40 to 125   
3TO-220    3TO-92