Datasheet
MAX4271/MAX4272/MAX4273
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +2.7V to +13.2V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= +5V and T
A
= +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Slow Turn-Off Time
t
SLOW
,
OFF
Time from trigger to V
GATE
< 0.1V
(triggered by either the ON input or the
slow comparator), C
GATE
= 1000pF to
GND
60 µs
Fast Turn-Off Time
t
FAST
,
OFF
Time from current overload to V
GATE
< 0.1V
(triggered by the fast comparator, during
normal operation), C
GATE
= 1000pF to GND
15 μs
Maximum Gate Protection
Voltage
Voltage at which internal zener clamp
circuitry is triggered, measured with
respect to V
IN
(MAX4271/MAX4272),
measured with respect to V
LLMON
(MAX4273)
6.7 7.5 V
V
IN
≥ 5V
5
Minimum Gate Drive Voltage
Measured with
respect to V
IN,
I
GATE
= 8.5µA
V
IN
≥ 2.7V 2.7
V
During fast discharge, due to a fast
comparator fault in normal operation
0.4 1
2.75
mA
During startup (current regulation provided
by fast comparator)
25 70 195
Gate Discharge Current
I
GATE
,
DIS
During normal discharge, due to a slow
comparator fault in normal mode, or by ON
going low
75 200 550
μA
LLMON Overvoltage Threshold
Startup is initiated only after V
LLMON
is less
than this voltage (MAX4273)
0.1 V
GATE Overvoltage Threshold
Startup is initiated only after V
GATE
is less
than this voltage
0.1 0.6 V
LLMON Impedance Im p ed ance to GN D , after a faul t ( M AX 4273) 1 kΩ
REFERENCE (MAX4273)
Output Voltage V
REF
No load, V
IN
= 5V
1.164
1.2
1.236
V
Line Regulation
Δ
V
REF
,
LINE
2.7V ≤ V
IN
≤ 13.2V, no load 1 8 mV
Load Regulation
ΔV
REF,
LOAD
I
REF
= 0 to 100μA, V
IN
= 5V 0.6 3 mV
ON AND RESET COMPARATORS
Threshold Voltage V
IN
= 5V, rising threshold at ON or INC
0.575
0.6
0.625
V
Hysteresis V
HYST
3mV
Power-Supply Rejection Ratio PSRR 2.7V ≤ V
IN
≤ 13.2V ±1
mV/V
10mV overdrive, ON going positive or
negative, INC going negative
10 μs
Propagation Delay
t
D
,
COMP
INC going positive 100 150 200 ms