Rainbow Electronics MAX5943 User Manual
Page 2
MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 7.5V to 37V, GND = 0V, and T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= 12V, T
A
= +25°C.)
(Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages referenced to GND, unless otherwise noted.)
IN ............................................................................-0.3V to +80V
OUT ........................................................................-0.3V to +80V
SENSE to IN..............................................................-1V to +0.3V
GATE1 to SENSE......................................................-0.3V to +8V
GATE2 to OUT (internally clamped).........................-0.3V to +8V
FAULT.....................................................................-0.3V to +85V
ON, TIM, ILIM, LATCH, OR_ADJ, ONQ1 ..........-0.3V to (IN + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
ESD Rating (Human Body Model)......................................2000V
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLIES
Supply Voltage Range
V
IN
7.5
37
V
Supply Current
I
IN
V
ON
= 3V, no load
1.3
2.3
mA
Shutdown Current
I
SD
V
ON
= 0.4V
5
10
µA
IN Default Undervoltage Lockout
V
UVLO
V
IN
rising, ON = IN
6.2
6.5
6.8
V
IN Default Undervoltage Lockout
Hysteresis
0.35
V
ON Undervoltage Lockout
Threshold
V
ON_REF
V
ON
rising
1.20
1.24
1.275
V
ON Undervoltage Lockout
Threshold Hysteresis
70
mV
ON Input Bias Current
I
ON
1
µA
GATE2
(current-limit/circuit-breaker control)
GATE2 Pullup Current
I
G2U
(Note 2)
36
45
54
µA
7.5V ≤ V
IN
≤ 8V
4.25
5.5
6.5
GATE2 High Voltage
V
G2
V
GATE2
- V
OUT
8V ≤ V
IN
≤ 37V
4.5
5.5
6.5
V
ILIM = GND
47.5
50
52.5
ILIM = floating
37
39
41
Current-Limit/Circuit-Breaker
Threshold Voltage
V
TH
V
IN
- V
SENSE
ILIM = IN
55
58.5
61
mV
ILIM = GND
70
75
80
ILIM = floating
54
59
64
Fast Pulldown Current-Limit
Threshold Voltage (MAX5943A)
V
THF
V
IN
- V
SENSE
(Note 3)
ILIM = IN
83
88
93
mV
GATE2 Pulldown Current
(MAX5943A)
I
G2D
V
TH
< (V
IN
- V
SENSE)
< V
THF
,
t < t
ILIM
335
435
535
µA
GATE2 Fast Pulldown Current
(MAX5943A)
I
G2DF
(V
IN
- V
SENSE)
> V
THF
, V
GATE2
= V
OUT
+
4.5V
80
125
200
mA
GATE2 Peak Pulldown Current
(MAX5943A)
I
G2DP
(V
IN
- V
SENSE
) = 1V
1.0
A