LTC1422CS8 datasheet(6/16 Pages) LINER

6 / 16 page

LTC1422

PIN FUNCTIONS

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

µA charge pump output cur-

rent. When the circuit breaker trips, the undervoltage

lockout circuit monitoring VCC trips, or the ON pin is pulled

low for more than 40

µs, 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 VCCand SENSE,

the circuit breaker will trip when the voltage across the

resistor exceeds 50mV for more than 10

µs. 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,

VCC and SENSE can be shorted together.

VCC (Pin 8): The positive supply input, ranging from 2.7V

to 13.2V for normal operation. ICC is typically 0.6mA. An

undervoltage lockout circuit disables the chip until the

voltage at VCC is greater than 2.47V.

1.232V

REFERENCE

GLITCH

FILTER

µs

FILTER

2.47V

UVL

50mV

REF

RESET

GND

COMP 3

VCC

SENSE

GATE

–

COMP 1

REF

COMP 2

µA

–

COMP 4

REF

TIMER

1422 BD

LOGIC

CHARGE

PUMP

BLOCK DIAGRA

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