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LM1117-Q1

ACTIVE

Automotive 1A 18V low-dropout (LDO) linear regulator with high power-supply rejection ratio

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Data sheet

LM1117-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Vin (max) (V) 18 Vin (min) (V) 2.5 Iout (max) (A) 1 Output options Fixed Output Vout (max) (V) 12 Vout (min) (V) 1.2 Fixed output options (V) 1.2, 3.3, 5, 12 Noise (µVrms) 60 PSRR at 100 KHz (dB) 53 Iq (typ) (mA) 0.065 Features Foldback Overcurrent protection Thermal resistance θJA (°C/W) 67.2, 95 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 1 Dropout voltage (Vdo) (typ) (mV) 900 Operating temperature range (°C) -40 to 125
Rating Automotive Vin (max) (V) 18 Vin (min) (V) 2.5 Iout (max) (A) 1 Output options Fixed Output Vout (max) (V) 12 Vout (min) (V) 1.2 Fixed output options (V) 1.2, 3.3, 5, 12 Noise (µVrms) 60 PSRR at 100 KHz (dB) 53 Iq (typ) (mA) 0.065 Features Foldback Overcurrent protection Thermal resistance θJA (°C/W) 67.2, 95 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 1 Dropout voltage (Vdo) (typ) (mV) 900 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7 TO-252 (KVU) 3 66.726 mm² 6.6 x 10.11
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
    • Junction temperature: –40°C to +150°C, TJ
  • Input voltage range VIN:
    • Absolute maximum: 20V
    • Operating range: 2.5V to 18V
  • Output voltage range VOUT:
    • 1.2V, 3.3V, 5V, 12V fixed
    • 0.8V to 13.0V (fixed, 100mV steps) available upon request
  • Output current: Up to 1A
  • Low quiescent current IQ: 65µA (typical)
  • ±1% output accuracy
  • High PSRR:
    • 60dB at 1kHz
    • 40dB at 1MHz
  • Internal soft-start time: 500µs (typical)
  • Foldback current limiting and thermal protection
  • Stable with 1µF ceramic output capacitors
  • Packages:
    • SOT-223 (DCY), RθJA= 95.4°C/W
    • TO-252 (KVU), RθJA= 67.2°C/W
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
    • Junction temperature: –40°C to +150°C, TJ
  • Input voltage range VIN:
    • Absolute maximum: 20V
    • Operating range: 2.5V to 18V
  • Output voltage range VOUT:
    • 1.2V, 3.3V, 5V, 12V fixed
    • 0.8V to 13.0V (fixed, 100mV steps) available upon request
  • Output current: Up to 1A
  • Low quiescent current IQ: 65µA (typical)
  • ±1% output accuracy
  • High PSRR:
    • 60dB at 1kHz
    • 40dB at 1MHz
  • Internal soft-start time: 500µs (typical)
  • Foldback current limiting and thermal protection
  • Stable with 1µF ceramic output capacitors
  • Packages:
    • SOT-223 (DCY), RθJA= 95.4°C/W
    • TO-252 (KVU), RθJA= 67.2°C/W

The LM1117-Q1 is an AEC-Q100 qualified linear voltage regulator for automotive applications. The device provides improved performance compared to traditional x1117 regulators, with tighter output accuracy and low quiescent current (IQ) to minimize standby power consumption.

The LM1117-Q1 input voltage range is from 2.5V to 18V (20V absolute maximum). The device is available in 1.2V, 3.3V, 5V, and 12V fixed output voltages.

The wide bandwidth PSRR performance of the LM1117-Q1 is typically greater than 60dB at 1kHz and 40dB at 1MHz, which attenuates the switching frequency of an upstream DC/DC converter.

Additionally, the LM1117-Q1 has an internal soft-start feature to reduce inrush current during start-up, which helps save space and cost in a design by minimizing the need for input capacitance. The LM1117-Q1 features a foldback current limit that reduces the power dissipation of the device during high-load current faults or shorting events.

The LM1117-Q1 is an AEC-Q100 qualified linear voltage regulator for automotive applications. The device provides improved performance compared to traditional x1117 regulators, with tighter output accuracy and low quiescent current (IQ) to minimize standby power consumption.

The LM1117-Q1 input voltage range is from 2.5V to 18V (20V absolute maximum). The device is available in 1.2V, 3.3V, 5V, and 12V fixed output voltages.

The wide bandwidth PSRR performance of the LM1117-Q1 is typically greater than 60dB at 1kHz and 40dB at 1MHz, which attenuates the switching frequency of an upstream DC/DC converter.

Additionally, the LM1117-Q1 has an internal soft-start feature to reduce inrush current during start-up, which helps save space and cost in a design by minimizing the need for input capacitance. The LM1117-Q1 features a foldback current limit that reduces the power dissipation of the device during high-load current faults or shorting events.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM1117-Q1 18V, 1A, Automotive, Fixed-Output Linear Voltage Regulator datasheet (Rev. B) PDF | HTML 16 Apr 2026
Application note An empirical analysis of the impact of board layout on LDO thermal performance (Rev. A) PDF | HTML 23 Sep 2025
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
E-book LDO Basics (Rev. A) 08 Apr 2019
Technical article LDO basics: dropout PDF | HTML 16 Mar 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

MLTLDO2EVM-037 — Universal LDO linear voltage regulator evaluation module for DCY, DDA and KVU packages

The MLTLDO2EVM-037 multipackage low-dropout (LDO) evaluation module (EVM) allows design engineers to evaluate the operation and performance of several common packages of linear regulators for possible use in their own circuit application. This EVM configuration contains a DDA, 3-pin and 5-pin KVU, (...)

User guide: PDF
Not available on TI.com
Evaluation board

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The TLV1117LV33EVM-714 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TLV1117LVxx device, which is a 1-A, positive fixed-voltage low-dropout (LDO) linear regulator.
User guide: PDF
Not available on TI.com
Simulation model

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LM1117 5P0 Unencrypted PSpice Transient Model

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Package Pins CAD symbols, footprints & 3D models
SOT-223 (DCY) 4 Ultra Librarian
TO-252 (KVU) 3 Ultra Librarian
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