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MAX5943AEEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
_______________________________________________________________________________________ 7
MAX5943A SHORT-CIRCUIT EVENT
(V
IN
= 37V)
MAX5943 toc17
I
IN
10A/div
V
OUT
50V/div
V
GATE2
50V/div
V
IN
50V/div
100ns/div
ILIM = GND
V
FAULT
50V/div
MAX5943A SHORT-CIRCUIT RESPONSE
(V
IN
= 8V)
MAX5943 toc18
I
IN
1A/div
V
OUT
10V/div
V
GATE2
10V/div
V
IN
10V/div
400μs/div
TIM = IN
V
FAULT
10V/div
MAX5943A SHORT-CIRCUIT RESPONSE
(V
IN
= 8V)
MAX5943 toc19
I
IN
10A/div
V
OUT
10V/div
V
GATE2
10V/div
V
IN
10V/div
100ns/div
V
FAULT
10V/div
MAX5943E SHORT-CIRCUIT RESPONSE
(V
IN
= 24V)
MAX5943 toc20
I
IN
166A/div
V
OUT
50V/div
V
GATE2
50V/div
V
IN
50V/div
200μs/div
V
FAULT
50V/div
MAX5943E SHORT-CIRCUIT RESPONSE
(V
IN
= 8V)
MAX5943 toc21
I
IN
60A/div
V
OUT
10V/div
V
GATE2
10V/div
V
IN
10V/div
100μs/div
V
FAULT
10V/div
TIM = IN
ORing SWITCHOVER WAVEFORM
MAX5943 toc22
I
IN1
500mA/div
V
OUT
1V/div
200μs/div
I
IN2
500mA/div
V
IN1
= 12V V
ON2
RISING = 12V
V
IN2
= 128V C
OUT
= 0
Typical Operating Characteristics (continued)
(V
IN
= +12V, T
A
= +25°C, unless otherwise noted.)
MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
8 _______________________________________________________________________________________
ORing SWITCHOVER WAVEFORM
(V
IN2
RISING ABOVE V
IN1
)
MAX5943 toc23
I
IN1
500mA/div
V
OUT
1V/div
10μs/div
I
IN2
500mA/div
V
IN1
= 12V V
ON2
RISING = 12V
V
IN2
= 13V C
OUT
= 0
ORing SWITCHOVER WAVEFORM
(V
IN2
FALLING BELOW V
IN1
)
MAX5943 toc24
I
IN1
500mA/div
V
OUT
1V/div
20μs/div
I
IN2
500mA/div
V
IN1
= 12V V
ON2
FALLING = 12V
V
IN2
= 13V C
OUT
= 0
MAX5943A HOT PLUG-IN LOAD CAPACITANCE
INTO ACTIVE PORT (NO FAULT)
MAX5943 toc25
I
IN
2A/div
V
FAULT
10V/div
400μs/div
V
OUT
10V/div
C
LOAD
= 220μF
TIM = IN
V
GATE2
10V/div
MAX5943A HOT PLUG-IN LOAD CAPACITANCE
INTO ACTIVE PORT (CURRENT-LIMIT TIMEOUT)
MAX5943 toc26
I
IN
1A/div
V
FAULT
10V/div
400μs/div
V
OUT
10V/div
C
LOAD
= 470μF
TIM = IN
V
GATE2
10V/div
Typical Operating Characteristics (continued)
(V
IN
= +12V, T
A
= +25°C, unless otherwise noted.)
MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
_______________________________________________________________________________________ 9
Pin Description
PIN NAME FUNCTION
1ON
On/Off-Control Input. ON sets the undervoltage lockout threshold and resets the part after a fault latch.
Drive ON high to enable the device. Drive ON low to disable the device. Connect ON to IN for the default
undervoltage lockout threshold. Connect a resistor-divider from IN to ON and GND to program the desired
undervoltage lockout threshold.
2 FAULT
Current-Fault, Active-Low, Open-Drain Output. FAULT asserts and latches low after a current-limit/circuit-
breaker fault has exceeded the current-limit/circuit-breaker timeout period (see the
FAULT
section).
3 TIM
Current-Limit/Circuit-Breaker Timeout Adjustment Input. Connect TIM to IN for the default timeout period or
connect a resistor from TIM to GND to program the current-limit/circuit-breaker timeout period.
4 ILIM
Current-Limit/Circuit-Breaker Threshold Input. Leave ILIM open for a 40mV circuit-breaker threshold,
connect to GND for a 50mV circuit-breaker threshold, or connect to IN for a 60mV circuit-breaker threshold
(see the Current Limiting section).
5 LATCH
Latch or Autoretry Fault Management Selection Input. Connect LATCH to IN to select latch-off mode
after a current-limit/circuit-breaker timeout. Connect LATCH to GND for autorestart mode after a current-
limit/circuit-breaker timeout.
6 OR_ADJ
ORing Switch Turn-On Current Threshold Adjustment Input. Select one of three ORing switch turn-on
threshold settings: connect OR_ADJ to GND, connect OR_ADJ to IN, or leave OR_ADJ floating (see the
Power-Supply ORing section).
7, 10, 13 N.C. No Connection. Not internally connected.
8 ONQ1
ORing Switch Manual Turn-On Input. Drive ONQ1 low to enable power-supply ORing. Drive ONQ1 high
to set GATE1 high to allow reverse current flow. ONQ1 is disabled when V
IN
is below the UVLO threshold,
V
ON
is below the V
ON_REF
threshold, and after a current/circuit-breaker fault.
9 GND Ground
11 OUT Output Voltage Sense. Connect to the output.
12 GATE2
Current-Limiter Switch Gate Drive Output. Connect GATE2 to the gate of the 2nd n-channel MOSFET.
GATE2 is a charge pump with a 45µA pullup current to 5.5V (typ) above OUT when active (see the Typical
Operating Circuit).
14 GATE1
ORing Switch Gate-Drive Output. Connect GATE1 to the gate of the 1st n-channel MOSFET. GATE1 is a
charge pump with a 45µA pullup current to 5.5V (typ) above SENSE when active (see the Typical
Operating Circuit).
15 SENSE
Current-Sense Negative Input. Connect a current-sense resistor, R
SENSE,
from IN to SENSE (see the
Typical Operating Circuit).
16 IN
Input Power and Current-Sense Positive Input. Connect IN to the positive terminal of the current-sense
resistor and to the power source (see the Typical Operating Circuit).
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX5943AEEE+

Mfr. #:
Buy MAX5943AEEE+
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers FireWire Current Limiter
Lifecycle:
New from this manufacturer.
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