LTC4213

1

4213f

APPLICATIO S

TYPICAL APPLICATIO

DESCRIPTIO

FEATURES

The LTC

current circuit breaker senses the voltage across the drain

and source terminals of an external N-channel MOSFET

with no need for a sense resistor. The advantages are a

lower cost and reduced voltage and power loss in the

switch path. An internal high-side driver controls the

external MOSFET gate.

Two integrated comparators provide dual level over-

current protection over the bias supply to ground common

mode range. The slow comparator has 16µs response

while the fast comparator trips in 1µs. The circuit breaker

has three selectable trip thresholds: 25mV, 50mV and

100mV. An ON pin controls the ON/OFF and resets circuit

breaker faults. READY signals the MOSFET is conducting

and the circuit breaker is armed. The LTC4213 operates

Electronic Circuit Breaker

1.25V Electronic Circuit Breaker

OFF ON

LTC4213

ON

READY

10k

GND

GATE

SI4864DY

1.25V

3.5A

1.25V

2.3V TO 6V

SENSEN

SENSEP

4213 TA01

, LTC and LT are registered trademarks of Linear Technology Corporation.

property of their respective owners.

Severe Overload Response

2µs/DIV

4213 TA01b

(50A/DIV)

(5V/DIV)

(1V/DIV)

(1V/DIV)