DESCRIPTION
The LTC4410 enables simultaneous battery charging and
operation of portable USB 1.0 and 2.0 compliant devices
while they are connected to a USB port. As the USB periph-
eral load increases, the LTC4410 proportionally reduces
the battery charge current to keep the total current less
than 500mA or 100mA, depending on the state of the MODE
pin.
The LTC4410 includes a USB present output that drives an
external P-channel MOSFET to disconnect the battery from
the USB peripheral when the USB power is valid. This
allows device operation when connected to the USB port,
even when the battery is deeply discharged.
Other features include reverse current blocking, thermal
shutdown and low quiescent current (80μA in 500mA
MODE) that is compliant with USB Suspend Mode.
The LTC4410 is available in the low profile (1mm) SOT-23
(ThinSOT) package.
FEATURES
Manages Total Power Between a USB Peripheral
and Battery Charger
Minimal Voltage Drop (100mV at 500mA)
Ultralow Battery Drain: 1μA
Reverse Current Blocking Diode Not Required
Undervoltage Lockout
Very Few External Components
Compatible with Several LTC Linear Battery Chargers
Overtemperature Protected
Dual Battery Charge Priority Management
Low Profile (1mm) SOT-23 Package
APPLICATIONS
Cellular Phones
PDAs
Digital Cameras
MP3 Players
Battery Backup Systems
TYPICAL APPLICATION
USB Powered Battery Charger and Power Manager
System Load Step Response
S8 PACKAGE
USB Power Management and Wall Adapter Power
Priority Dual Battery Charging with Wall Adapter
