LTC4089-1
USB Power Manager with
High Voltage Switching Charger
Features Description Seamless Transition Between Power Sources: Li-Ion
Battery, USB, and 6V to 36V External Supply
nn High Efficiency 1.2A Charger from 6V to 36V Input
nn Load Dependent Charging from USB Input
Guarantees Current Compliance
nn 215mО© Internal Ideal Diode plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When External Supply/USB Not Present
nn Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate without Risk of Overheating
nn Selectable 100% or 20% Current Limit (e.g.,
500mA/100mA) from USB Input
nn Preset 4.1V Charge Voltage with 0.8% Accuracy
nn C/10 Charge Current Detection Output
nn NTC Thermistor Input for Temperature Qualified
Charging
nn Tiny (6mm Г— 3mm Г— 0.75mm) 22-Pin DFN Package The LTCВ®4089-1 is a USB power manager plus high voltage Li-Ion battery charger. This device controls the total
current used by the USB peripheral for operation and
battery charging. Battery charge current is automatically
reduced such that the sum of the load current and the …