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STW4102IQT Folha de dados(PDF) 14 Page - STMicroelectronics

Nome de Peças STW4102IQT
Descrição Electrónicos  Dual USB/wall adapter Li-ion battery charger with gas gauge
PDF  34 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW4102IQT Folha de dados(HTML) 14 Page - STMicroelectronics

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Application schematics
STw4102
14/34
5
Application schematics
5.1
Charge from USB or wall adapter
The MAIN input is used with either a wall adapter or a USB charger. The charge current can
be programmed to 100 mA or 500 mA max for use with a USB 2.0 port, or programmed to
the value set by the Rset resistor for use with a wall adapter or a dedicated USB charger.
The USBPWR input is used only for charging from a USB port (100 mA or 500 mA max).
Figure 16.
Charge using internal power devices
Table 8.
External component list
Name
Typ. value
Tolerance
Comments
Rset
12k to 120k
1%
Main charge current setting
Rcg
30m
Ω
1%
Gas gauge sense resistor
C1
1µF
Internal supply decoupling capacitor
C2
1µF
Internal voltage reference decoupling capacitor
C3
0.1 to 22µF
When the battery is removed, a capacitor of at least
15µF is required for low ripple on the battery line.
C4
0.1 to 1µF
MAIN input decoupling capacitor
C5
0.1 to 1µF
USBPWR input decoupling capacitor
Indicator LED
to power
battery voltage
IO voltage
32kHz
Rset
C1
Rcg
STw4102
Reset
StandBy
C2
VOUT
SENSE
BATT
BATTSENSE
ISET
CVIS
C32KHZ
STDBY
ICG+
ICG-
GND
RESETN
SDA
SCL
VIO
LDOFB
LDODRV
CVREF
EOCHG
PWRDETECTN
MAIN
USBPWR
DRIVER
C3
management
from wall adapter
or USB port/charger
from USB port only
C5
C4
TEST



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