3

Functional pin description

GND

Device ground pin.

VIN

Supply voltage. This pin supplies power to the internal analog and digital circuitries when voltage is higher than

VUVLO. Bypass this pin to GND with a 10 μF ceramic capacitor. Input capacitor CIN must be chosen with low ESR

to reduce the input voltage ripple.

SW

Inductor connection to internal PMOS and NMOS switches.

VOUT

Output voltage sense input. It provides the feedback voltage level to the regulation circuitry. 10 µF output

capacitor COUT must be connected close to the pin or through a short trace and should have low ESR to reduce

the output voltage ripple.

EN

Enable pin. A logic low level on this pin disables the device. High level enables the device. Do not leave this pin

floating.

D0, D2

Output voltage selection pins. See the Section 5 for VOUT selection. Do not leave these pins floating. These pins

can be dynamically changed during operation.

PGOOD

Power Good open drain output. If used it requires a pull-up resistor to hold a high level signal. High impedance

indicates that VOUT is above proper good threshold.

ST1PS01

Functional pin description

DS12799 - Rev 5

page 4/20