Datasheet

Data Sheet ADP2109
Rev. B | Page 5 of 16
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VIN GND
SW
EN FB
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
07964-003
1
A
B
C
2
BALL A1
INDICATOR
Figure 2. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
A1 VIN Power Source Input. VIN is the source of the PFET high-side switch. Bypass VIN to GND with a 2.2 μF or greater
capacitor as close to the ADP2109 as possible.
A2
GND
Ground. Connect all the input and output capacitors to GND.
B SW Switch Node Output. SW is the drain of the PFET switch and NFET synchronous rectifier.
C1 EN Enable Input. Drive EN high to turn on the ADP2109. Drive EN low to turn it off and reduce the input current to 0.1 μA.
C2 FB Feedback Input of the Error Amplifier. Connect FB to the output of the switching regulator.