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REG1117A
  • REG1117A
  • REG1117A

REG1117A

ACTIVE

1-A, 15-V, linear voltage regulator from -40°C to +125°C

Texas Instruments REG1117A Product Info

1 April 2026 4

Parameters

Rating

Catalog

Vin (max) (V)

15

Vin (min) (V)

3.7

Iout (max) (A)

1

Output options

Adjustable Output, Fixed Output

Vout (max) (V)

13.8

Vout (min) (V)

1.25

Fixed output options (V)

1.8, 2.5, 5

Noise (µVrms)

38

PSRR at 100 KHz (dB)

29

Iq (typ) (mA)

4

Thermal resistance θJA (°C/W)

65

Load capacitance (min) (µF)

10

Regulated outputs (#)

1

Accuracy (%)

2

Dropout voltage (Vdo) (typ) (mV)

1200

Operating temperature range (°C)

-40 to 125

Package

SOT-223 (DCY)-4-45.5 mm² 6.5 x 7

Features

  • FIXED AND ADJUSTABLE VERSIONS
  • 2.85V MODEL FOR SCSI-2 ACTIVE TERMINATION
  • OUTPUT CURRENT:
         REG1117: 800mA max
         REG1117A: 1A max
  • OUTPUT TOLERANCE: ±1% max
  • DROPOUT VOLTAGE:
         REG1117: 1.2V max at IO = 800mA
         REG1117A: 1.3V max at IO = 1A
  • INTERNAL CURRENT LIMIT
  • THERMAL OVERLOAD PROTECTION
  • SOT-223 AND DDPAK SURFACE-MOUNT PACKAGES
  • APPLICATIONS
    • SCSI-2 ACTIVE TERMINATION
    • HAND-HELD DATA COLLECTION DEVICES
    • HIGH EFFICIENCY LINEAR REGULATORS
    • BATTERY POWERED INSTRUMENTATION
    • BATTERY MANAGEMENT CIRCUITS FOR NOTEBOOK AND PALMTOP PCs
    • CORE VOLTAGE SUPPLY: FPGA, PLD, DSP, CPU

All trademarks are the property of their respective owners.

  • FIXED AND ADJUSTABLE VERSIONS
  • 2.85V MODEL FOR SCSI-2 ACTIVE TERMINATION
  • OUTPUT CURRENT:
         REG1117: 800mA max
         REG1117A: 1A max
  • OUTPUT TOLERANCE: ±1% max
  • DROPOUT VOLTAGE:
         REG1117: 1.2V max at IO = 800mA
         REG1117A: 1.3V max at IO = 1A
  • INTERNAL CURRENT LIMIT
  • THERMAL OVERLOAD PROTECTION
  • SOT-223 AND DDPAK SURFACE-MOUNT PACKAGES
  • APPLICATIONS
    • SCSI-2 ACTIVE TERMINATION
    • HAND-HELD DATA COLLECTION DEVICES
    • HIGH EFFICIENCY LINEAR REGULATORS
    • BATTERY POWERED INSTRUMENTATION
    • BATTERY MANAGEMENT CIRCUITS FOR NOTEBOOK AND PALMTOP PCs
    • CORE VOLTAGE SUPPLY: FPGA, PLD, DSP, CPU

All trademarks are the property of their respective owners.

Description

The REG1117 is a family of easy-to-use three-terminal voltage regulators. The family includes a variety of fixed-and adjustable-voltage versions, two currents (800mA and 1A) and two package types (SOT-223 and DDPAK). See the chart below for available options.

Output voltage of the adjustable versions is set with two external resistors. The REG1117 low dropout voltage allows its use with as little as 1V input-output voltage differential.

Laser trimming assures excellent output voltage accuracy without adjustment. An NPN output stage allows output stage drive to contribute to the load current for maximum efficiency.

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