PM8805 datasheet(9/45 Pages) STMICROELECTRONICS

9 / 45 page

DS12813 Rev 1

9/45

PM8805

Pin description and connection diagram

34, 35

GND45

System low potential; it is the return of the second active bridge and

it is connected to the Source of the IN45 low-side MOSFET. It must

be connected to the system AGND, together with the other bridges'

grounds.

42, 43

GND78

System low potential; it is the return of the second active bridge and

it is connected to the Source of the IN78 low-side MOSFET. It must

be connected to the system AGND, together with the other bridges'

grounds.

EP1

Exposed pad

Connect the pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to the IN78 signal. Internally the

pad is connected with the drains of the lower side MOSFETs used in

the 2nd bridge.

EP2

Exposed pad

Connect the pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to the IN45 signal. Internally the

pad is connected with the drains of the lower side MOSFETs used in

the 2nd bridge.

EP3

Exposed pad

Connect the pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to the IN36 signal. Internally the

pad is connected with the drains of the lower side MOSFETs used in

the 1st bridge.

EP4

Exposed pad

Connect the pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to the IN12 signal. Internally the

pad is connected with the drains of the lower side MOSFETs used in

the 1st bridge.

EP5

Main exposed pad

Connect this pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to VOB. Internally this pad is

connected with the drain of the upper side MOSFETs used in the

bridges.

EP6

Exposed pad

Connect the pad to a PCB copper plane to improve heat dissipation;

it must be electrically connected to the VOB signal. Internally the

pad is connected with EP5, the drain of the high-side MOSFET used

in the hot swap section.

Table 2. Pin description (continued)

Pin#

Name

Function

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