ltc4414ems8-trpbf Linear Technology Corporation, ltc4414ems8-trpbf Datasheet - Page 5

• Manufacturer Part Number: ltc4414ems8-trpbf
• Description: 36v, Low Loss Powerpath Controller For Large Pfets
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
PI FU CTIO S
STAT (Pin 1): Open-Drain Output Status Pin. When the
SENSE pin is pulled above the V
power source by V
threshold (V
from an open state to a current sink (I
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.
CTL (Pin 2): 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 Open-Drain STAT pin ON. If the
STAT pin is used to control an auxiliary P-channel power
switch, then a second active source of power, such as an
AC wall adaptor, will be connected to the load (see Appli-
cations Information). An internal current sink will pull the
CTL pin voltage to ground (logical low) if the pin is open.
GND (Pin 3): Ground. Provides a power return for all the
internal circuits.
U
U
RTO
PRIMARY
SUPPLY
) is reached. The STAT pin will then go
ON/OFF
+
–
U
RTO
2
or more, the reverse turn-off
W
CTL
IN
if the MOSFET is configured
VOLTAGE/CURRENT
POWER
3.5µA
REFERENCE
SELECTOR
IN
POWER
0.5V
S(SNK)
pin with an auxiliary
SOURCE
+
–
AUXILIARY
C1
SUPPLY
). The STAT pin
+
–
ANALOG CONTROLLER
GOFF
–
7
V
IH
IN
A1
).
3
)
*
GND
+
6
SENSE
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.
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 0.1µF to
10µF if needed to suppress load transients.
GATE (Pin 8): 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.
*DRAIN-SOURCE DIODE OF MOSFET
IN
(Pin 7): Primary Input Supply Voltage. Supplies power
ON/OFF
IN
VOLTAGE CLAMP
pin). This input is usually supplied power from
LINEAR GATE
DRIVER AND
IN
and SENSE pins when an auxiliary power
GATE
STAT
8
1
4414 BD
V
CC
STATUS
OUTPUT
+
–
OUTPUT
TO LOAD
LTC4414
FR
) of 20mV
4414fc
5