MAX5943 Maxim Integrated Products, MAX5943 Datasheet - Page 19

• Manufacturer Part Number: MAX5943
• Description: FireWire Current Limiter and Low-Drop ORing Switch Controller
• Manufacturer: Maxim Integrated Products

FireWire
PORT
SUPPLY
CURRENT-LIMIT/CIRCUIT-BREAKER
AND INRUSH CONTROL
R2
R1
VERY-LOW-DROP
ORing DIODE
R3
FAULT
ON
TIM
Typical Operating Circuit
ILIM
MAX5943 EQUIVALENT CIRCUIT
IN
______________________________________________________________________________________
+
R
SENSE
V
FireWire Current Limiter and Low-Drop
LATCH
IS
-
SENSE GATE1
MAX5943A
GND
OR_ADJ
Q1
GATE2
LOAD DISCONNECT
SWITCH
ONQ1
Q2
OUT
TO
FireWire
PORT
ORing Switch Controller
TRANSISTOR COUNT: 2324
PROCESS: BiCMOS
MAX5943A
MAX5943B Circuit breaker
MAX5943C Circuit breaker
MAX5943D Circuit breaker
MAX5943E Circuit breaker
FireWire
PORT
SUPPLY
V
7.15kΩ
PART
IN
+
-
1kΩ
= 12V
10kΩ
Typical Application Circuit
Current limit
BREAKER
CURRENT
LIMITER/
4kΩ
CIRCUIT
FAULT
ON
TIM
ILIM
IN
30mΩ
LATCH
DEFAULT
TIMEOUT
SENSE GATE1
Chip Information
MAX5943A
(ms)
0.5
GND
2
1
2
4
SI7958DP
Selector Guide
www.DataSheet4U.com
OR_ADJ
Q1
PROGRAMMABLE
1.04ms to 11.05ms
TIMEOUT RANGE
SI7958DP
130µs to 1.38ms
260µs to 2.76ms
32.5µs to 345µs
GATE2
65µs to 690µs
ONQ1
Q2
OUT
TO
FireWire
PORT
19