ltc1422cs8-trpbf Linear Technology Corporation, ltc1422cs8-trpbf Datasheet - Page 6

• Manufacturer Part Number: ltc1422cs8-trpbf
• Description: Hot Swap Controller
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
LTC1422
PIN
GATE (Pin 6): The high side gate drive for the external
N-Channel. An internal charge pump guarantees at least
10V of gate drive when V
rise or fall at the GATE is set by an external capacitor
connected between GATE and GND, and the 10 A charge
pump output current. When the circuit breaker trips, the
undervoltage lockout circuit monitoring V
ON pin is pulled low for more than 40 s, the GATE pin is
immediately pulled to GND.
SENSE (Pin 7) : Circuit Breaker Set Pin. With a sense
resistor placed in the supply path between V
6
TIMER
U
ON
FUNCTIONS
2
3
U
Q1
REF
REF
2 A
U
+
–
+
–
CC
COMP 1
COMP 4
W
is 5V. The slope of the voltage
2.47V
UVL
V
CC
CC
CC
8
trips, or the
and SENSE,
LOGIC
+
COMP 3
FILTER
10 s
SENSE
–
+
–
7
50mV
the circuit breaker will trip when the voltage across the
resistor exceeds 50mV for more than 10 s. If the circuit
breaker trip current is set to twice the normal operating
current, only 25mV is dropped across the sense resistor
during normal operation. To disable the circuit breaker,
V
V
to 13.2V for normal operation. I
undervoltage lockout circuit disables the chip until the
voltage at V
CC
CC
and SENSE can be shorted together.
(Pin 8): The positive supply input, ranging from 2.7V
Q3
CC
20 s GLITCH
REFERENCE
1.232V
FILTER
is greater than 2.47V.
CHARGE
PUMP
GATE
6
COMP 2
CC
+
–
is typically 0.6mA. An
Q2
12 A
REF
1422 BD
5
1
4
FB
RESET
GND
1422fb