AT1309
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Power dissipation consideration
The AT1309 maximum power dissipation depends on the thermal resistance of the IC
package and circuit board, the temperature difference between the die junction and
ambient air, and the rate of any airflow. The power dissipation in the device depends
on the operating conditions of the regulator. In continuous condition, the step-up
converter power dissipated internally across the internal N-MOS can be approximated
by :
IO ×V
Vin
Vin × D
12 fOSC × L
1
P
= [(
O )2 +
(
)2 ]× RDS(ON ) × D
boost
where
IO : It is the load current.
fOSC : It is a switching frequency.
7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/2/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
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AIMTRON [ AIMTRON TECHNOLOGY ]
