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LP2981A-29DBVT Datasheet(PDF) 7 Page - Texas Instruments

Part # LP2981A-29DBVT
Description  100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LP2981A-29DBVT Datasheet(HTML) 7 Page - Texas Instruments

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Reverse Input-Output Voltage
VOUT
VIN
VOUT
VIN
Schottky
LP2981
LP2981-29
,, LP2981-50,, LP2981A-29,, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
SLVS768 – MARCH 2007
APPLICATION INFORMATION (continued)
An inherent diode is present across the PNP pass element of the LP2981.
With the anode connected to the output, this diode is reverse biased during normal operation, since the input
voltage is higher than the output. However, if the output is pulled one VBE higher than the input, or if the input is
abruptly stepped below the output, this diode is forward biased and can cause a parasitic silicon-controlled
rectifier (SCR) to latch, resulting in current flowing from the output to the input (values in excess of 100 mA can
cause damage). Thus, to prevent possible damage to the regulator in any application where the output may be
pulled above the input, an external Schottky diode must be connected between the output and input. With the
anode on output, this Schottky limits the reverse voltage across the output and input pins to
∼0.3 V, preventing
the regulator's internal diode from forward biasing.
7
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