
MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
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Chip Information
TRANSISTOR COUNT: 2324
PROCESS: BiCMOS
SENSE GATE1
OR_ADJ ONQ1GND
MAX5943 EQUIVALENT CIRCUIT
LATCHILIM
FAULT
ON
GATE2 OUT
Q1 Q2
LOAD DISCONNECT
SWITCH
VERY-LOW-DROP
ORing DIODE
CURRENT-LIMIT/CIRCUIT-BREAKER
AND INRUSH CONTROL
IN
TO
FireWire
PORT
FireWire
PORT
SUPPLY
MAX5943A
TIM
R3
+ V
IS
-
R
SENSE
R1
R2
Typical Operating Circuit
PART
CURRENT
LIMITER/
CIRCUIT
BREAKER
DEFAULT
TIMEOUT
(ms)
PROGRAMMABLE
Current limit
Circuit breaker
Circuit breaker
Circuit breaker
Circuit breaker
30mΩ
SI7958DP SI7958DP
SENSE GATE1
OR_ADJ ONQ1GNDLATCHILIM
FAULT
ON
GATE2 OUT
Q1 Q2
IN
+
-
V
IN
= 12V
TO
FireWire
PORT
FireWire
PORT
SUPPLY
MAX5943A
TIM
4kΩ
10kΩ1kΩ
7.15kΩ
Typical Application Circuit
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