Datasheet

Data Sheet ADP2138/ADP2139
Rev. C | Page 5 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
0
9496-002
VIN EN
SW
GND VOUT
1
2
3
4
5
6
MODE
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 2. Pin Configuration (Top View)
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 VIN
Power Source Input. VIN is the source of the PFET high-side switch. Bypass VIN to GND with a 4.7 μF or greater
capacitor as close to the ADP2138/ADP2139 as possible.
2 SW
Switch Node Output. SW is the drain of the P-channel MOSFET switch and N-channel synchronous rectifier.
Connect the output LC filter between SW and the output voltage.
3 GND Ground. Connect the input and output capacitors to GND.
4 EN Buck Activation. To turn on the buck, set EN to high. To turn off the buck, set EN to low.
5 MODE
Mode Input. Drive the MODE pin high for the operating mode to force continuous PWM switching. Drive the MODE
pin low to allow automatic PWM/PSM operating mode.
6 VOUT Output Voltage Sensing Input.