R16AN0002EU0300 Rev.3.00
Page 3
Jan 6, 2022
ISL9241 Operation Modes Application Note
1.1.1
NVDC Turbo Mode
When the system power exceeds the power that can be provided by the adapter, the ISL9241 regulates the
adapter current at the Adapter Current Limit value. The remaining power to the system is provided from the
battery, so the adapter and the battery provide the system power together. This is called NVDC Turbo mode.
1.2
Bypass Mode with Battery Charging
When the adapter voltage is higher than the battery voltage, the ISL9241 can be operated in Bypass mode. In
Bypass mode, the adapter is connected directly to the system and the system power is provided directly from the
adapter. The charging and discharging power goes through the power stage and inductor.
When the available adapter power is higher than the power consumed by the system, the remaining power is used
to charge the battery. When the battery is not charging, the converter is not switching. When charging starts, the
converter starts switching in the forward direction, delivering power from the adapter to charge the battery.
Figure 2. Bypass Mode with Battery Charging
Input Power
System Power
Battery
Charge Power
Switch is OFF, but diode path
supports power from the
battery (VADP > VBAT to use
Bypass mode)
