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LTC4007-1 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4007-1
Description  4A, High Efficiency, Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4007-1 Datasheet(HTML) 7 Page - Linear Technology

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LTC4007-1
40071f
PI FU CTIO S
PROG (Pin 9): Current Programming/Monitoring Input/
Output. An external resistor to GND programs the peak
charging current in conjunction with the current sensing
resistor. The voltage at this pin provides a linear indication
of charging current. Peak current is equivalent to 1.19V.
Zero current is approximately 0.3V. A capacitor from
PROG to ground is required to filter higher frequency
components. The maximum resistance to ground is 100k.
Values higher than 100k can cause the charger to shut
down.
ICL (Pin 10): Input Current Limit Indicator. Active low
digital output. Internal 10
µA pull-up to 3.5V. Pulled low if
the charger current is being reduced by the input current
limiting function. The pin is capable of sinking at least
100
µA. If VLOGIC is greater than 3.3V, add an external
pull-up.
CSP (Pin 11): Current Amplifier CA1 Input. The CSP and
BAT pins measure the voltage across the sense resistor,
RSENSE, to provide the instantaneous current signals re-
quired for both peak and average current mode operation.
BAT (Pin 12): 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 13):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 14): 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 15): 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 16): 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 17): Drives the top external P-channel MOSFET
of the battery charger buck converter.
PGND (Pin 18): High Current Ground Return for the BGATE
Driver.
NC (Pin 19): No Connect.
BGATE (Pin 20): Drives the bottom external N-channel
MOSFET of the battery charger buck converter.
INFET (Pin 21): Drives the Gate of the External Input PFET.
SHDN (Pin 22): 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.
DCIN (Pin 23): External DC Power Source Input. Bypass
this pin with at least 0.01
µF. See Applications Information.
CHG (Pin 24): Charge Status Output. When the battery is
being charged, the CHG pin is pulled low by an internal
N-channel MOSFET. Internal 10
µA pull-up to 3.5V. If
VLOGIC is greater than 3.3V, add an external pull-up. The
timer function can be defeated by forcing this pin below 1V
(or connecting it to GND).
Exposed Pad (Pin 25): The exposed pad, GND and PGND
should be connected together with a low ohmic connec-
tion.


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