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Parameters

Output options Fixed Output Iout (Max) (A) 1 Vin (Max) (V) 35 Vin (Min) (V) 7.1 Vout (Max) (V) 5 Vout (Min) (V) 5 Fixed output options (V) 5 Noise (uVrms) 40 Iq (Typ) (mA) 5.2 Thermal resistance θJA (°C/W) 35 Load capacitance (Min) (µF) 0 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 64 Dropout voltage (Vdo) (Typ) (mV) 3000 Operating temperature range (C) -55 to 150 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

TO-CAN (NDS) 2 969 mm² 38.94 x 24.89 TO-CAN (NDT) 3 92 mm² 10.03 x 9.14 open-in-new Find other Linear regulators (LDO)

Features

  • Specified to be compatible, worst case, with TTL and DTL
  • Output current in excess of 1A
  • Internal thermal overload protection
  • No external components required

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Description

The LM109 series are complete 5V regulators fabricated on a single silicon chip. They are designed for local regulation on digital logic cards, eliminating the distribution problems association with single-point regulation. The devices are available in two standard transistor packages. In the solid-kovar TO-5 header, it can deliver output currents in excess of 200 mA, if adequate heat sinking is provided. With the TO-3 power package, the available output current is greater than 1A.

The regulators are essentially blowout proof. Current limiting is included to limit the peak output current to a safe value. In addition, thermal shutdown is provided to keep the IC from overheating. If internal dissipation becomes too great, the regulator will shut down to prevent excessive heating.

Considerable effort was expended to make these devices easy to use and to minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response somewhat. Input bypassing is needed, however, if the regulator is located very far from the filter capacitor of the power supply. Stability is also achieved by methods that provide very good rejection of load or line transients as are usually seen with TTL logic.

Although designed primarily as a fixed-voltage regulator, the output of the LM109 series can be set to voltages above 5V, as shown. It is also possible to use the circuits as the control element in precision regulators, taking advantage of the good current-handling capability and the thermal overload protection.


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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 15
Type Title Date
* Datasheet LM109/LM309 5-Volt Regulator datasheet (Rev. A) May 03, 2004
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 06, 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application note AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) May 06, 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Application note Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise (Rev. B) May 05, 2013
Application note Packaging Limits Range of Linear Regulators May 08, 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application note High Stability Regulators Oct. 03, 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999

Design & development

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CAD/CAE symbols

Package Pins Download
TO (NDT) 3 View options
TO-3 (NDS) 2 View options

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