BD8629FS_09 datasheet(7/12 Pages) ROHM

Part #	BD8629FS

Description	FET Controller Type 3ch System Power Supply ICs

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Manufacturer	ROHM [Rohm]

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Technical Note

7/11

BD8629FS

www.rohm.com

2009.05 - Rev.A

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Operation description

Enable control

The device can be controlled ON/OFF by EN terminal (13 pin) voltage.

An internal circuit starts when VEN reaches 1.4V.

VEN

0

EN terminal voltage

VSS

0

SS terminal voltage

VSSCLM

VSSTH

Output setting voltage

VO

0

tSS

VENTH

PDET

VPDET

0

Fig. 3 ON/OFF transition wave form in EN controlling

Soft start time set function

As for BD8629FS, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS

and SGND terminal.

Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.

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