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LM1086ISX-3.3/NOPB View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
LM1086ISX-3.3/NOPB 1.5-A Low Dropout Positive Regulators TI
Texas Instruments TI
LM1086ISX-3.3/NOPB Datasheet PDF : 30 Pages
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7 Detailed Description
7.1 Overview
A basic functional diagram for the LM1086-ADJ (excluding protection circuitry) is shown in Figure 13. The
topology is basically that of the LM317 except for the pass transistor. Instead of a Darlingtion NPN with its two
diode voltage drop, the LM1086 uses a single NPN. This results in a lower dropout voltage. The structure of the
pass transistor is also known as a quasi LDO. The advantage of a quasi LDO over a PNP LDO is its inherently
lower quiescent current. The LM1086 is specified to provide a minimum dropout voltage of 1.5V over
temperature, at full load.
Figure 13. Basic Functional Block Diagram
7.2 Functional Block Diagram
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