DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl9520 ISL9520 FN8348
Rev 1.00
March 6, 2013 Narrow VDC Regulator/Charger with SMBus Interface
The ISL9520 is a highly integrated Narrow VDC system voltage
regulator and battery charger controller. Operating parameters
are programmable over the System Management Bus (SMBus).
The ISL9520 is designed for applications where the system
power source is either the battery pack or the output of the
regulator/charger. This makes the max voltage to the system
equal to the max battery voltage instead of the max adapter
voltage. The ISL9520 also includes a patented system to control
trickle charging deeply discharged batteries while maintaining
system voltage at a user defined minimum. High efficiency is
achieved with a DC/DC synchronous-rectifier buck converter,
equipped with diode emulation and variable switching
frequency for enhanced light load efficiency and AC-adapter
boosting prevention. The ISL9520 can charge two, three, or
four series connected Lithium-ion cells, at up to 8A charge
current. Default settings for 2-, 3-or 4-cell operation at
power-up are selected by an external pin. Integrated MOSFET
drivers and bootstrap diode result in fewer components and
smaller implementation area. Low offset current-sense …
