LTC1473

DCIN, BAT1, BAT2 Supply Voltage ................. 0.3 to 32V
SENSE+, SENSE , V + ................................ 0.3 to 32V
GA1, GB1, GA2, GB2 ..................................... 0.3 to 42V
SAB1, SAB2 ................................................. 0.3 to 32V
SW, VGG ...................................................... 0.3 to 42V
IN1, IN2, DIODE...........................................0.3V to 7.5V
Junction Temperature (Note 2) ............................. 125°C
Operating Temperature Range
Commercial ................................................. 0°C to 70°C
Industrial ............................................... 40°C to 85°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C


Description

The LTC®1473 provides a power management solution for single and dual battery notebook computers and other portable equipment. 

The LTC1473 drives two sets of backto- back N-channel MOSFET switches to route power to the input of the main system switching regulator. An internal boost regulator provides the voltage to fully enhance the logic level N-channel MOSFET switches. 

The LTC1473 senses current to limit surge currents both into and out of the batteries and the system supply capacitor during switch-over transitions or during fault conditions. A user-programmable timer monitors the time the MOSFET switches are in current limit and latches them off when the programmed time is exceeded. A unique "2-diode mode" logic ensures system start-up regardless of which input receives power first.