LTC1422 Linear Technology, LTC1422 Datasheet - Page 6

• Manufacturer Part Number: LTC1422
• Description: Hot Swap Controller
• Manufacturer: Linear Technology

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. The slope of the voltage rise or fall at the
GATE is set by an external capacitor connected between
GATE and GND, and the 10 A charge pump output cur-
rent. When the circuit breaker trips, the undervoltage
lockout circuit monitoring V
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
+
–
+
–
COMP 1
COMP 4
W
CC
trips, or the ON pin is pulled
2.47V
UVL
V
CC
CC
8
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
REFERENCE
GLITCH
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