參數(shù)資料
型號(hào)： LTC4008
廠商： Linear Technology Corporation
英文描述： 4A, High Efficiency, Standalone Li Battery Charger
中文描述： 第4A，高效，獨(dú)立鋰電池充電器
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 241K
代理商： LTC4008
6
LTC4007
4007i
PIU
BAT (Pin 15):
Battery Sense Input and the Negative
Reference for the Current Sense Resistor. A precision
internal resistor divider sets the final float potential on this
pin. The resistor divider is disconnected during shutdown.
CHEM (Pin 16):
Select 4.1V or 4.2V cell chemistry by
connecting the pin to GND or open, respectively. Internal
14
μ
A pull-up to 5.3V. Can also be driven with open-
collector/drain logic levels.
FLAG (Pin 17):
Active low open-drain output that indi-
cates when charging current has declined to 10% of
maximum programmed current. A pull-up resistor is
required if this function is used. The pin is capable of
sinking at least 100
μ
A.
CLP (Pin 18):
Positive input to the supply current limiting
amplifier, CL1. The threshold is set at 100mV above the
voltage at the CLN pin. When used to limit supply current,
a filter is needed to filter out the switching noise. If no
current limit function is desired, connect this pin to CLN.
CLN (Pin 19):
Negative Reference for the Input Current
Limit Amplifier, CL1. This pin also serves as the power
supply for the IC. A 10
μ
F to 22
μ
F bypass capacitor should
be connected as close as possible to this pin.
TGATE (Pin 20):
Drives the top external P-channel MOSFET
of the battery charger buck converter.
PGND (Pin 21):
High Current Ground Return for the BGATE
Driver.
BGATE (Pin 22):
Drives the bottom external N-channel
MOSFET of the battery charger buck converter.
INFET (Pin 23):
Drives the Gate of the External Input PFET.
SHDN (Pin 24):
Charger is shut down and timer is reset
when this pin is HIGH. Internal 10
μ
A pull-up to 3.5V. This
pin can also be used to reset the charger by applying a
positive pulse that is a minimum of 0.1
μ
s long.
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