LTC4410 Datasheet, PDF (1/8 Pages) Linear Technology – USB Power Manager in ThinSOT

LTC4410
USB Power Manager
in ThinSOT
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}
U
APPLICATIO S
■ _{Cellular Phones}
■ _PDAs
■ _{Digital Cameras}
■ _{MP3 Players}
■ _{Battery Backup Systems}
DESCRIPTIO
The LTC^®4410 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^TM) package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
USB Powered Battery Charger and Power Manager
100mA 500mA
4.35V TO 5.5V
FROM
USB
4.7µF
MODE
V_OUT
LTC4410
V_IN
GND CHP USBP
1Ω
3.4k
1%
4.7µF
SYSTEM POWER
SUPPLY
IRLML6401
1M
OFF ON
0.1µF
SHDN
PROG
BAT
V_CC
LTC4053
NTC
TIMER
GND
USB
MODE
500mA
100mA
SUSPEND
LTC4410
MODE
1
0
1
LTC4053
SHDN
1
1
0
1-CELL
Li-Ion
4410 TA01
200mA
LOAD
CURRENT
0mA
440mA
BATTERY
CHARGER
CURRENT
240mA
0mA
System Load Step Response
5µs/DIV
4410 TA02
sn4410 4410fs
1