USB Power Controller and Li-Ion Linear Charger
LTC4055/LTC4055-1
USB Power Controller and Li-Ion Charger
FEATURES
DESCRIPTION
n Charges Single-Cell Li-Ion Batterie...
Description
LTC4055/LTC4055-1
USB Power Controller and Li-Ion Charger
FEATURES
DESCRIPTION
n Charges Single-Cell Li-Ion Batteries Directly from USB Port
n Load Dependent Charging Guarantees USB Input Current Compliance
n Automatic Battery Switchover When Input Supply is Removed
n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating*
n Selectable 500mA/100mA Current Limit n Low Loss Full PowerPath™ Control with Ideal Diode
Operation (Reverse Current Blocking) n Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4055-1) n 4.1V Float Voltage (LTC4055-1) Improves Battery Life
and High Temperature Safety Margin n USB-Compliant Suspend Mode n Programmable Charge Current and Termination Timer n Soft-Start Limits Inrush Current n NTC Thermistor Input for Temperature Qualified
Charging n Tiny (4mm × 4mm × 0.75mm) QFN Package
APPLICATIONS
n Portable USB Devices: Cameras, MP3 Players, PDAs
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patent, including 6522118.
The LTC®4055/LTC4055-1 are USB power manager and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts manage and limit the total current used by the USB peripheral for operation and battery charging. Depending on the state of the current select pin (H...
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