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LP2986 데이터시트(PDF) 15 Page - Texas Instruments

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부품명 LP2986
상세설명  Micropower, 200 mA Ultra Low-Dropout Fixed or Adjustable Voltage Regulator
PDF  26 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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LP2986 데이터시트(HTML) 15 Page - Texas Instruments

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VIN
VOUT
PNP
GND
SCHOTTKY DIODE
LP2986
VIN
VOUT
PNP
GND
LP2986
LP2986
www.ti.com
SNVS137H – MARCH 1999 – REVISED APRIL 2013
REVERSE INPUT-OUTPUT VOLTAGE
The PNP power transistor used as the pass element in the LP2986 has an inherent diode connected between
the regulator output and input.
During normal operation (where the input voltage is higher than the output) this diode is reverse-biased.
However, if the output voltage is pulled above the input, or the input voltage is pulled below the output, this diode
will turn ON and current will flow into the regulator output pin.
In such cases, a parasitic SCR can latch which will allow a high current to flow into VIN (and out the ground pin),
which can damage the part.
In any application where the output voltage may be higher than the input, an external Schottky diode must be
connected from VIN to VOUT (cathode on VIN, anode on VOUT), to limit the reverse voltage across the LP2986 to
0.3V (see the Absolute Maximum Ratings section.
Copyright © 1999–2013, Texas Instruments Incorporated
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