The package of AX3821 is SOT-23-6L; the pin assignment is given by:
Bootstrap. A 10nF capacitor is connected
between SW and BS pins to drive the
power switch’s gate above the supply
Ground Pin. Connect this pin to exposed
Feedback. An external resistor divider
FB from the output to GND, tapped to the FB
pin sets the output voltage.
Power Supply Input. Drive 4.5V to 13V
voltage to this pin to power on this chip.
VIN Connect a 10μF ceramic bypass
capacitor between VIN and GND to
Switch Output. Connect this pin to the
switch end of the inductor.
Enable Input. EN is a digital input that
turns the regulator on or off. Drive EN
EN high to turn on the regulator, drive it low
to turn it off. Pull up with 100kΩ resistor
for automatic startup.
A : Taping
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Rev.1.2 May.08, 2013