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LP2981-30DBVTE4 Datasheet(PDF) 8 Page - Texas Instruments |
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LP2981-30DBVTE4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page Reverse Input-Output Voltage VOUT VIN VOUT VIN Schottky LP2981 LP2981 SLVS521F – JULY 2004 – REVISED AUGUST 2008 ......................................................................................................................................................... www.ti.com 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. 8 Submit Documentation Feedback Copyright © 2004–2008, Texas Instruments Incorporated |
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