EC49513A/L
300mA Linear Regulator with Enable
And Fast Discharge Function
Dropout Voltage
A regulator’s minimum input output voltage differential, or dropout voltage, determines the lowest usable
supply voltage. In battery powered systems, this will determine the useful end of life battery voltage. The
EC49513A/L uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source
on-resistance (RDS (ON)) multiplied by the load current.
VDROPOUT = VIN −VOUT = RDS (ON ) xIout
E-CMOS Corp. (www.ecmos.com.tw)
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2010/10/29