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LTC4055 Datasheet(PDF) 22 Page - Linear Technology

Part # LTC4055
Description  USB Power Controller and Li-Ion Linear Charger
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4055 Datasheet(HTML) 22 Page - Linear Technology

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LTC4055
4055p
TYPICAL APPLICATIO S
+
IN1
IN2
WALL
SUSP
VNTC
NTC
OUT
Li-Ion
CELL
500mA/100mA SELECT
SHUTDOWN
10
µF
1
µF
TIMER PROG
LTC4055
CLPROG
GND
4055 F06
TO LDOs,
REGs, ETC
BAT
CHRG
ACPR
HPWR
SHDN
CTIMER
0.1
µF
RPROG
105k
5V (NOM)
FROM USB
CABLE VBUS
5V WALL
ADAPTER INPUT
RCLPROG
105k
R1
34.8k
R2
10k
USB
CONTROLLER
R3
100k
NTC
100k
DC/DC
CONVERTER
EN
VIN
VOUT
Figure 6. USB Hosting Application
USB Hosting Application: The LTC4055’s 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 can be configured 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.



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