LTC4055EUF-1-TRPBF 데이터 시트보기 (PDF) - Linear Technology

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LTC4055EUF-1-TRPBF

USB Power Controller and Li-Ion Charger

Linear Technology 

LTC4055/LTC4055-1

TYPICAL APPLICATIONS

USB Hosting Application: The LTC4055/LTC4055-1’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/LTC4055-1 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.

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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