AP72250

Document number: DS44135 Rev. 1 - 2

3 of 26

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January 2022

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AP72250

Pin Descriptions

Pin Name

Pin Number

Function

VOUT

A1, A2

Output Voltage Power Rail. Connect VOUT to the output load as shown in Figure 1.

GND

A3

Analog Ground used by the control circuitry.

FB

A4

Feedback sensing terminal for the output voltage. Connect this pin to the resistive divider of the output.

See Setting the Output Voltage section for more details.

SW

B1, B2

Power Switching Output. SW is the switching node that converts power to the output. Connect the inductor

from SW to VIN.

MODE

B3

Mode Select. MODE is used to select the operation mode of the device. Connect MODE to GND to set the

device to operate in PFM Mode. Leave MODE floating to set the device to operate in USM. Connect MODE to

VCC to set the device to operate in Forced PWM.

PG

B4

Power-Good. Open drain power-good output that is pulled to GND when the output voltage is out of its

regulation limits or during soft-

start. There is an internal 5MΩ pull-up resistor connected to PG.

PGND

C1, C2

Power Ground.

VIN

C3

Power Input. VIN supplies power to the IC as well as the step-up converter power MOSFETs. Bypass VIN to

GND with a suitably large capacitor to eliminate noise due to the switching of the IC. Drive VIN with a 0.6V

(1.0V for startup) to 5.5V power source. See Input Capacitor section for more details.

EN

C4

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator and

low to turn it off. Connect to VIN or leave floating for automatic startup.