ISL6299 Intersil Corporation, ISL6299 Datasheet - Page 7

• Manufacturer Part Number: ISL6299
• Description: Li-ion/Li-Polymer Battery Charger Accepting Two Power Sources
• Manufacturer: Intersil Corporation

Trickle Charge Current
When the battery voltage is below the minimum battery
voltage V
operates in a trickle/preconditioning mode, where the charge
current is typically 14% of the programmed charge current
for the cradle input. If power comes from the USB input, the
trickle mode current is approximately 53mA.
End-of-Charge Indication
The CHG pin internal open-drain MOSFET turns off when
the charge current falls below the I
programmable for the cradle input and fixed for the USB
input. Once the end-of charge-current is reached, the CHG
status will be latched. The latch can be reset at one of the
following conditions:
Regardless of the CHG pin status, however, the charger
does not turn off as long as an input power source is
attached.
1. The part is disabled and re-enabled
2. The selected input source has been removed and re-
3. The USBON turns LOW and turns back to HIGH for the
4. The BAT pin voltage falls below the CV mode threshold
applied
USB input
MIN
given in the electrical specification, the charger
7
MIN
threshold, which is
ISL6299
Power Presence Indication
When either the USB or the cradle input voltage is above the
POR threshold, the PPR pin internal open-drain MOSFET
turns on indicating the presence of input power.
Power-Good Range
Even if there is a power present, the charger will not deliver
any current to the output if the power-good conditions are
not met. The following two conditions together define the
power-good voltage range:
where the VOS is the offset voltage for the input and output
voltage comparator, discussed shortly. Both VPOR, VOS
have hysteresis, as given in the Electrical Specification table.
The charger will not charge the battery if the input voltage
does not meet the power-good conditions.
Thermal Foldback (Thermaguard™)
The thermal foldback function reduces the charge current
when the internal temperature reaches the thermal foldback
threshold, which is typically 100°C. This protects the charger
from excessive thermal stress at high input voltages.
1. VCDRL or VUSB > VPOR
2. VCDRL or VUSB - VBAT > VOS
March 17, 2005
FN9184.0