Datasheet

PM8903A Pin description and connection diagrams
Doc ID 024147 Rev 1 5/33
2 Pin description and connection diagrams
Figure 3. Pin connection (top view)
2.1 Pin description
1
2
3
4
5678
16 15 14 13
12
11
10
9
EN
SYNCH
PGOOD
BOOT
PHASE PHASE PHASE
PSKIP / MS
PGND PGND VIN VIN
VCC
GND
FB
COMP
Table 2. Pin description
Pin # Name Function
1EN
Enable. Internally pulled up by 5 µA to V
CC
.
Force low to disable the device, set free or pull up above turn-on threshold to
enable the converter operations.
2 SYNCH
Synchronization pin.
According to PSKIP status, the IC sends the synchronization signal out of this
pin when master, while accepting a synchronization signal when slave.
Connect to the same SYNCH pin of a similar part when synchronizing ICs.
In case of single IC operation, leave floating.
3 PGOOD
Open drain output set free after SS has finished and pulled low when V
OUT
is
out of the PGOOD window or any protection is triggered.
Pull up to a voltage lower than V
CC
, if not used it can be left floating.
4BOOT
Bootstrap pin.
It provides power supply for the floating high-side driver. Connect with 0.1 µF
to PHASE. See
Figure 1 .
5 to 7 PHASE
Output inductor connection.
The pins are connected to the embedded MOSFETs (high-side source and
low-side drain). Connect directly to output inductor. See
Figure 1 .
8 PSKIP / MS
Pulse-skip and master/slave definition.
Connect with a resistor to GND or leave it floating to define:
Pulse-skip feature status;
Master/slave for synchronization;
Switching frequency.
See
Section 5.8 on page 17 .