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| LTC4055-1_15 Datasheet, PDF (22/24 Pages) Linear Technology – USB Power Controller and Li-Ion Charger | |||
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LTC4055/LTC4055-1
TYPICAL APPLICATIONS
USB Hosting Application: The LTC4055/LTC4055-1âs
IN1 and IN2 are Set Hi-Z by Pulling the SUSP Pin
Above 1.2V
In applications where the power is required to go back
out on to the USB VBUS the LTC4055/LTC4055-1 can be
conï¬gured to turn off its input power path, IN1 and IN2.
Forcing the SUSP input pin above 1.2V does this. Figure 6
shows the application circuit. The wall adapter or the battery
can still provide power to OUT, which in turn can provide
power to VBUS when commanded from the USB controller.
The ability to charge the battery is enabled when the wall
adapter is present.
5V (NOM)
FROM USB
CABLE VBUS
1μF
5V WALL
ADAPTER INPUT
USB
CONTROLLER
DC/DC
VOUT CONVERTER VIN
EN
R1
34.8k
R2
10k
IN1
IN2
WALL
SUSP
LTC4055
OUT
BAT
+
CHRG
ACPR
R3
100k
VNTC
NTC
HPWR
SHDN
TIMER PROG CLPROG GND
NTC
100k
CTIMER
0.1μF
RPROG RCLPROG
100k 105k
10μF
Li-Ion
CELL
500mA/100mA SELECT
SHUTDOWN
4055 F06
Figure 6. USB Hosting Application
TO LDOs,
REGs, ETC
4055fb
22
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