ADP2121

Rev. B | Page 5 of 20

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

MODE VIN

SW

FB

GND

TOP VIEW

(BALL SIDE DOWN)

(BUMPS ON OPPOSITE SIDE)

Not to Scale

1

A

B

C

2

BALL A1

INDICATOR

EN

Pin No.

Mnemonic

Description

A1

MODE

Mode Select. This pin toggles between auto mode (PFM and PWM switching) and PWM mode. Set MODE low to

allow the part to operate in auto mode. Pull MODE high to force the part to operate in PWM mode. The voltage

applied to MODE should never be higher than the voltage applied to VIN. Do not leave this pin floating.

B1

SW

Switch Node.

C1

FB

Feedback Divider Input. Connect the output capacitor from FB to GND as close as possible to the ADP2121 to set

the output voltage ripple and to complete the control loop.

A2

VIN

Power Supply Input. Connect the input capacitor from VIN to GND as close as possible to the ADP2121.

B2

EN

Enable. Pull this pin high to enable the part. Set this pin low to disable the part. Do not leave this pin floating.

C2

GND

Ground Pin.