LTC4213

1

Rev. A

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Electronic Circuit Breaker

The LTC®4213 is an electronic circuit breaker. An overcur-

rent 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 overcurrent

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 from

1.25V Electronic Circuit Breaker

APPLICATIONS

n

Fast 1µs Response Circuit Breaker

n

3 Selectable Circuit Breaker Thresholds

n

No Sense Resistor Required

n

Dual Level Overcurrent Fault Protection

n

Controls Load Voltages from 0V to 6V

n

High-Side Drive for External N-Channel MOSFET

n

Undervoltage Lockout

n

READY Pin Signals When Circuit Breaker Armed

n

Small Plastic (3mm × 2mm) DFN and TSOT-23

(ThinSOT™) Packages

n

Electronic Circuit Breaker

n

High-Side Switch

n

Hot Board Insertion

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Severe Overload Response

OFF ON

LTC4213

ON

READY

10k

GND

GATE

SI4864DY

1.25V

3.5A

1.25V

2.3V TO 6V

SENSEN

SENSEP

4213 TA01a

2s/DIV

4213 TA01b

(50A/DIV)

(5V/DIV)

(1V/DIV)

(1V/DIV)