LM117QML

ACTIVE

Military Grade 1.5A Adjustable Output Linear Regulator / LDO

Product details

Output options Adjustable Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 4.2 Vout (max) (V) 37 Vout (min) (V) 1.25 Fixed output options (V) 0 Noise (µVrms) 75 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 39 Rating Military Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 4 PSRR at 100 KHz (dB) 40 Dropout voltage (Vdo) (typ) (mV) 1200 Operating temperature range (°C) -55 to 125
Output options Adjustable Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 4.2 Vout (max) (V) 37 Vout (min) (V) 1.25 Fixed output options (V) 0 Noise (µVrms) 75 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 39 Rating Military Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 4 PSRR at 100 KHz (dB) 40 Dropout voltage (Vdo) (typ) (mV) 1200 Operating temperature range (°C) -55 to 125
CFP (NAC) 16 62.9285 mm² 9.91 x 6.35 DIESALE (Y) See data sheet LCCC (NAJ) 20 79.0321 mm² 8.89 x 8.89 TO-CAN (K) 2 989.0252 mm² 38.938 x 25.4 TO-CAN (NDT) 3 91.6742 mm² 10.03 x 9.14
  • Available with Radiation Ensured
    • High Dose Rate 100 krad(Si)
    • ELDRS Free 100 krad(Si)
  • Specified max. 0.3% Load Regulation (LM117)
  • Specified 0.5A or 1.5A Output Current
  • Adjustable Output Down to 1.2V
  • Current Limit Constant with Temperature
  • 80 dB Ripple Rejection
  • Output is Short-Circuit Protected

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  • Available with Radiation Ensured
    • High Dose Rate 100 krad(Si)
    • ELDRS Free 100 krad(Si)
  • Specified max. 0.3% Load Regulation (LM117)
  • Specified 0.5A or 1.5A Output Current
  • Adjustable Output Down to 1.2V
  • Current Limit Constant with Temperature
  • 80 dB Ripple Rejection
  • Output is Short-Circuit Protected

All trademarks are the property of their respective owners.

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying either 0.5A or 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.

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 the negative complement, see LM137 series data sheet.

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying either 0.5A or 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.

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 the negative complement, see LM137 series data sheet.

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Technical documentation

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Type Title Date
* Data sheet LM117QML 3-Terminal Adjustable Regulator datasheet (Rev. D) 16 Apr 2013
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) 06 May 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 06 May 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
More literature Die D/S LM117H MDE 3-Terminal Adj Regulator 13 Sep 2012
More literature Die D/S LM117KG MD8 3-Terminal Adj Regulator 13 Sep 2012
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999

Design & development

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Package Pins Download
CFP (NAC) 16 View options
DIESALE (Y)
LCCC (NAJ) 20 View options
TO-CAN (K) 2 View options
TO-CAN (NDT) 3 View options

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