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LM1085IT-12/NOPB Datenblatt(PDF) 9 Page - Texas Instruments

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Teilenummer LM1085IT-12/NOPB
Bauteilbeschribung  3-A Low Dropout Positive Regulators
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LM1085
www.ti.com
SNVS038H – JULY 1999 – REVISED JANUARY 2015
7 Detailed Description
7.1 Overview
A basic functional diagram for the LM1085-ADJ (excluding protection circuitry) is shown in Figure 10. The
topology is basically that of the LM317 except for the pass transistor. Instead of a Darlington NPN with its two
diode voltage drop, the LM1085 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 LM1085 is ensured to provide a minimum dropout voltage of 1.5V over temperature,
at full load.
Figure 10. Basic Functional Diagram for the LM1085, Excluding Protection Circuitry
7.2 Functional Block Diagram
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