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LTC4007 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC4007
Description  4A, High Efficiency, Standalone Li Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4007 Datasheet(HTML) 6 Page - Linear Technology

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6
LTC4007
4007i
PI FU CTIO S
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
µA 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
µA.
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
µF to 22µF 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
µA 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
µs long.


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