© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

BATTERY

CHARGE CONTROLLER

SC1766

Janaury 30, 1998

OUTLINE DRAWING SO-8

OUTLINE DRAWING SO-14

1. A stable constant charge current is crucial for reli-

able precision -

∆V detection by the SC1766 since fluc-

tuation of the charge current can cause fluctuation of

the battery terminal voltage due to battery internal se-

ries resistance, which will likely result in erroneous -

∆V

detection by a properly functioning SC1766.

2. To prevent damage to the SC1766 from over-

voltage, make sure that none of the SC1766 pins see

any voltage beyond the supply voltage, which needs to

be between +9V and +18V.

CHARGER CIRCUIT DESIGN TIPS

3. If the battery charge current is high, e.g. over 1.5A,

quality of circuit board layout and wiring connection

points become increasingly important in the charger

circuit reliability.

4. Since the SC1766 is a CMOS device, care must be

taken in handling to avoid possible damage from elec-

trostatic discharge.