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LTC4412HV Datasheet(PDF) 11 Page - Linear Technology

Part No. LTC4412HV
Description  36V, Low Loss PowerPath Controller in ThinSOT
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC4412HV Datasheet(HTML) 11 Page - Linear Technology

 
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11
LTC4412HV
sn4412hv 4412hvfs
Multiple Battery Charging
Figure 6 illustrates an application circuit for automatic
dual battery charging from a single charger. Whichever
battery has the lower voltage will receive the charging
current until both battery voltages are equal, then both will
be charged. When both are charged simultaneously, the
higher capacity battery will get proportionally higher cur-
rent from the charger. For Li-Ion batteries, both batteries
will achieve the float voltage minus the forward regulation
voltage of 20mV. This concept can apply to more than two
batteries. The STAT pins provide information as to which
batteries are being charged. For intelligent control, the
CTL pin input can be used with a microcontroller and
back-to-back MOSFETs as shown in Figure 4. This allows
complete control for disconnection of the charger from
either battery.
TYPICAL APPLICATIO S
VIN
GND
CTL
SENSE
GATE
STAT
1
2
3
6
5
4
LTC4412HV
P-CHANNEL
MOSFET
SUPPLY
INPUT
LOGIC
INPUT
COUT
*
TO LOAD
4412HV F07
*DRAIN-SOURCE DIODE OF MOSFET
0.1
µF
Figure 7. Logic Controlled High Side Power Switch
High Side Power Switch
Figure 7 illustrates an application circuit for a logic con-
trolled high side power switch. When the CTL pin is a
logical low, the LTC4412HV will turn on the MOSFET.
Because the SENSE pin is grounded, the LTC4412HV will
apply maximum clamped gate drive voltage to the MOSFET.
When the CTL pin is a logical high, the LTC4412HV will
turn off the MOSFET by pulling its gate voltage up to the
supply input voltage and thus deny power to the load. The
MOSFET is connected with its source connected to the
power source. This disables the drain-source diode from
supplying voltage to the load when the MOSFET is off. Note
that if the load is powered from another source, then the
drain-source diode can forward bias and deliver current to
the power supply connected to the VIN pin.
VIN
GND
CTL
SENSE
GATE
STAT
1
2
3
6
5
4
LTC4412HV
TO LOAD OR
PowerPath
CONTROLLER
TO LOAD OR
PowerPath
CONTROLLER
STATUS IS HIGH
WHEN BAT1 IS
CHARGING
STATUS IS HIGH
WHEN BAT2 IS
CHARGING
470k
4412HV F06
VCC
*
*
BAT1
BATTERY
CHARGER
INPUT
470k
VCC
BAT2
VIN
GND
CTL
SENSE
GATE
STAT
1
2
3
6
5
4
LTC4412HV
*DRAIN-SOURCE DIODE OF MOSFET
0.1
µF
Figure 6. Automatic Dual Battery Charging
from Single Charging Source
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.


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