PM8903 datasheet(5/34 Pages) STMICROELECTRONICS

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PM8903

Pin description and connection diagrams

Doc ID 022748 Rev 1

5/34

Pin description and connection diagrams

Figure 3.

Pin connection (top view)

2.1

Pin description

567

SYNCH

PGOOD

BOOT

VCC

GND

COMP

Table 2.

Pin description

Pin#

Name

Function

1EN

Enable. Internally pulled up by 5

μA to VCC.

Force low to disable the device, set free or pull up above turn-on threshold to

enable the converter operations.

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.

PGOOD

Open drain output set free after SS has finished and pulled low when VOUT is

out of the PGOOD window or any protection is triggered.

Pull up to a voltage lower than VCC, 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.

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