LTC4412HV Linear Technology, LTC4412HV Datasheet - Page 5

• Manufacturer Part Number: LTC4412HV
• Description: Low Loss PowerPath Controller in ThinSOT
• Manufacturer: Linear Technology

BLOCK DIAGRA
PI FU CTIO S
V
to the internal circuitry and is one of two voltage sense
inputs to the internal analog controller (The other input to
the controller is the SENSE pin). This input is usually
supplied power from a battery or other power source
which supplies current to the load. This pin can be by-
passed to ground with a capacitor in the range of 0.1 F to
10 F if needed to suppress load transients.
GND (Pin 2): Ground. Provides a power return for all the
internal circuits.
CTL (Pin 3): Digital Control Input. A logical high input (V
on this pin forces the gate to source voltage of the primary
P-channel MOSFET power switch to a small voltage (V
This will turn the MOSFET off and no current will flow from
the primary power input at V
so that the drain to source diode does not forward bias. A
high input also forces the STAT pin to sink 10 A of current
(I
channel power switch, then a second active source of
power, such as an AC wall adaptor, will be connected to the
load (see Applications Information). An internal current
sink will pull the CTL pin voltage to ground (logical low) if
the pin is open.
IN
S(SNK)
U
(Pin 1): Primary Input Supply Voltage. Supplies power
). If the STAT pin is used to control an auxiliary P-
U
PRIMARY
SUPPLY
ON/OFF
+
–
U
3
W
CTL
IN
if the MOSFET is configured
VOLTAGE/CURRENT
POWER
3.5 A
REFERENCE
SELECTOR
POWER
0.5V
SOURCE
+
–
AUXILIARY
C1
SUPPLY
+
–
ANALOG CONTROLLER
GOFF
–
1
V
IH
IN
A1
).
2
)
GND
+
6
SENSE
STAT (Pin 4): Open-Drain Output Status Pin. When the
SENSE pin is pulled above the V
power source by about 20mV or more, the reverse turn-off
threshold (V
from an open state to a 10 A current sink (I
STAT pin current sink can be used, along with an external
resistor, to turn on an auxiliary P-channel power switch
and/or signal the presence of an auxiliary power source to
a microcontroller.
GATE (Pin 5): Primary P-Channel MOSFET Power Switch
Gate Drive Pin. This pin is directed by the power controller
to maintain a forward regulation voltage (V
between the V
source is not present. When an auxiliary power source is
connected, the GATE pin will pull up to the SENSE pin
voltage, turning off the primary P-channel power switch.
SENSE (Pin 6): Power Sense Input Pin. Supplies power to
the internal circuitry and is a voltage sense input to the
internal analog controller (The other input to the controller
is the V
an auxiliary source such as an AC adapter or back-up
battery which also supplies current to the load.
*DRAIN-SOURCE DIODE OF MOSFET
ON/OFF
IN
VOLTAGE CLAMP
pin). This input is usually supplied power from
LINEAR GATE
DRIVER AND
RTO
IN
10 A
) is reached. The STAT pin will then go
and SENSE pins when an auxiliary power
GATE
STAT
5
4
4412HV BD
V
CC
STATUS
OUTPUT
www.DataSheet4U.com
LTC4412HV
IN
pin with an auxiliary
+
–
OUTPUT
TO LOAD
FR
S(SNK)
sn4412hv 4412hvfs
) of 20mV
). The
5