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Linear & low-dropout (LDO) regulators

UA78

ACTIVE

1.5-A, 38-V, linear voltage regulator

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Data sheet

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UA78

ACTIVE
Data sheet Order now

Product details

Output options Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 38 Vin (min) (V) 7 Vout (max) (V) 24 Vout (min) (V) 5 Fixed output options (V) 5, 8, 10, 12, 15, 24 Rating Catalog Noise (µVrms) 52 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 4.3 Thermal resistance θJA (°C/W) 22 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3.75 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
Output options Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 38 Vin (min) (V) 7 Vout (max) (V) 24 Vout (min) (V) 5 Fixed output options (V) 5, 8, 10, 12, 15, 24 Rating Catalog Noise (µVrms) 52 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 4.3 Thermal resistance θJA (°C/W) 22 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3.75 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
TO-220 (KCS) 3 46.228 mm² 10.16 x 4.55 TO-220 (KCT) 3 45.212 mm² 10.16 x 4.45 TO-263 (KTT) 3 154.8384 mm² 10.16 x 15.24
  • 3-Terminal Regulators
  • Available in fixed 5-V/8-V/10-V/12-V/
    15-V/24-V options
  • Output Current up to 1.5 A
  • Internal Thermal-Overload Protection
  • High Power-Dissipation Capability
  • Internal Short-Circuit Current Limiting
  • Output Transistor Safe-Area Compensation
  • Output Capacitor Not Needed for Stability
  • 3-Terminal Regulators
  • Available in fixed 5-V/8-V/10-V/12-V/
    15-V/24-V options
  • Output Current up to 1.5 A
  • Internal Thermal-Overload Protection
  • High Power-Dissipation Capability
  • Internal Short-Circuit Current Limiting
  • Output Transistor Safe-Area Compensation
  • Output Capacitor Not Needed for Stability

This series of fixed-voltage integrated-circuit voltage regulators is designed for a wide range of applications. These applications include on-card regulation for elimination of noise and distribution problems associated with single-point regulation. Each of these regulators can deliver up to 1.5 A of output current. The internal current-limiting and thermal-shutdown features of these regulators essentially make them immune to overload. In addition to use as fixed-voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents, and also can be used as the power-pass element in precision regulators.

This series of fixed-voltage integrated-circuit voltage regulators is designed for a wide range of applications. These applications include on-card regulation for elimination of noise and distribution problems associated with single-point regulation. Each of these regulators can deliver up to 1.5 A of output current. The internal current-limiting and thermal-shutdown features of these regulators essentially make them immune to overload. In addition to use as fixed-voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents, and also can be used as the power-pass element in precision regulators.
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Technical documentation

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Type Title Date
* Data sheet µA78xx Fixed Positive Voltage Regulators datasheet (Rev. P) PDF | HTML 13 Jan 2015
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note Hybrid Battery Charger with Load Control for Telecom Equipments (Rev. A) 09 May 2018
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Application note A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes 15 Jun 2015
Application note Linear power for automated industrial systems 09 Jan 2015
Analog Design Journal Techniques for accurate PSRR measurements 28 Oct 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Analog Design Journal How to pick a linear regulator for noise-sensitive applications 22 Jan 2013
Application note ANY-OUT™ LDO Controlled by I2C™ IO Expander Device (Rev. A) 20 Sep 2012
Application note Linear and Switching Voltage Regulator Fundamental Part 1 21 Mar 2007
Analog Design Journal A 3-A, 1.2-Vout linear regulator with 80% efficiency and Plost < 1W 10 Oct 2006

Design & development

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Package Pins CAD symbols, footprints & 3D models
TO-220 (KCS) 3 Ultra Librarian
TO-220 (KCT) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian
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