LTC4085
USB Power Manager with
Ideal Diode Controller and
Li-Ion Charger
DESCRIPTION FEATURES The LTCВ®4085 is a USB power manager and Li-Ion battery
charger designed for portable battery-powered applications. The part controls the total current used by the USB
peripheral for operation and battery charging. The total
input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100mA or 500mA).
Battery charge current is automatically reduced such that
the sum of the load current and charge current does not
exceed the programmed input current limit. Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
215mО© Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPathв„ў
When Wall Adapter/USB Input Not Present
Load Dependent Charging Guarantees Accurate USB
Input Current Compliance
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate Without
Risk of Overheating*
Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
Battery Charge Current Independently Programmable …