ST1PS02 datasheet(4/23 Pages) STMICROELECTRONICS

4 / 23 page

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 C1 must be chosen with low ESR

to reduce the input voltage ripple.

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 C2 must be connected close to the pin or through a short trace and should have low ESR to reduce the

output voltage ripple.

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

floating.

D0, D1, D2

Output voltage selection pins. See the Table 2 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.

AUX

Load switch selection pins. Vout2 output is activated when this pin is at high level. Held to ground if auxiliary

output (Vout2) is not used or if it should be disabled.

Vout2

Auxiliary output. It provides the same regulated voltage level as main output (VOUT) less drop on the load switch

circuitry. 10 µF output capacitor COUT2 must be connected close to the pin or through a short trace and should

have low ESR to reduce the output voltage ripple. This output is controlled from a soft-start circuit, if unused can

be left open.

Current limit threshold input. Held to ground if not used and default current limitation is the proper value. For

smaller current values a pull-down resistor must be used.

ST1PS02

Functional pin description

DS13206 - Rev 1

page 4/23

ST1PS02 Datasheet(PDF) 4 Page - STMicroelectronics