LTC4410
USB Power Manager
in ThinSOT
U
FEATURES
DESCRIPTIO
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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 peripheral 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.
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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
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APPLICATIO S
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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.
Cellular Phones
PDAs
Digital Cameras
MP3 Players
Battery Backup Systems
The LTC4410 is available in the low profile (1mm) SOT-23
(ThinSOTTM) package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIO
USB Powered Battery Charger and Power Manager
100mA 500mA
4.35V TO 5.5V
FROM
USB
VIN
4.7µF
GND
LTC4410
CHP
OFF ON
4.7µF
200mA
USBP
IRLML6401
1Ω
3.4k
1%
SHDN
VCC
System Load Step Response
SYSTEM POWER
SUPPLY
VOUT
MODE
PROG
1M
BATTERY
CHARGER
CURRENT
BAT
LTC4053
LOAD
CURRENT
0mA
440mA
NTC
TIMER
GND
240mA
1-CELL
Li-Ion
0.1µF
0mA
4410 TA01
USB
LTC4410
MODE
MODE
500mA
1
100mA
0
SUSPEND
1
5µs/DIV
4410 TA02
LTC4053
SHDN
1
1
0
sn4410 4410fs
1
