Input-Output (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. Because the

MAX603/MAX604 use a P-channel MOSFET pass tran-

plied by the load current (see

Electrical Characteristics).

Quickly stepping up the input voltage from the dropout

voltage can result in overshoot. This occurs when the

pass transistor is fully on at dropout and the IC is not

given time to respond to the supply voltage change.

Prevent this by slowing the input voltage rise time.

5V/3.3V or Adjustable, Low-Dropout,

10

______________________________________________________________________________________

___________________Chip Topography

IN

0.100"

(2.54mm)

0.104"

(2.64mm)

OFF

GND

SET

OUT

TRANSISTOR COUNT: 111

NO DIRECT SUBSTRATE CONNECTION. THE N-SUBSTRATE

IS INTERNALLY SWITCHED BETWEEN THE MORE POSITIVE

OF IN OR OUT.