LTC4213 Datasheet, PDF (1/20 Pages) Linear Technology – No RSENSE™ Electronic Circuit Breaker

FEATURES
■ _{Fast 1µs Response Circuit Breaker}
■ _{3 Selectable Circuit Breaker Thresholds}
■ _{No Sense Resistor Required}
■ _{Dual Level Overcurrent Fault Protection}
■ _{Controls Load Voltages from 0V to 6V}
■ _{High Side Drive for External N-Channel FET}
■ _{Undervoltage Lockout}
■ _{READY Pin Signals When Circuit Breaker Armed}
■ _{Small Plastic (3mm x 2mm) DFN Package}
U
APPLICATIO S
■ _{Electronic Circuit Breaker}
■ _{High-Side Switch}
■ _{Hot Board Insertion}
TYPICAL APPLICATIO
1.25V Electronic Circuit Breaker
V_IN
1.25V
SI4864DY
V_OUT
1.25V
3.5A
V_BIAS
2.3V TO 6V
OFF ON
SENSEP GATE SENSEN
V_CC
LTC4213
V_BIAS
10k
ON
GND I_SEL ^READY
4213 TA01
LTC4213
No R_SENSE™
Electronic Circuit Breaker
DESCRIPTIO
The LTC^®4213 is an Electronic Circuit Breaker. An over-
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
from V_CC = 2.3V to 6V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R_SENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Severe Overload Response
I_OUT
(50A/DIV)
V_OUT
(1V/DIV)
V_GATE
(5V/DIV)
V_IN
(1V/DIV)
2µs/DIV
4213 TA01b
4213f
1