Datasheet

MAX5955/MAX5956
Low-Voltage, Dual Hot-Swap Controllers with
Independent On/Off Control
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN_
= +1V to +13.2V provided at least one supply is higher than +2.7V, V
ON1
= V
ON2
= +2.7V, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
IN1
= +5V, V
IN2
= +3.3V, and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
ON_
< 4.5V 0.03
V
ON_
> 4.5V 100ON_ Input Bias Current I
BON
V
IN1
= V
IN2
= +13.2V
V
ON_
= 4.5V 0.03 1
µA
ON_ Pulse-Width Low t
UNLATCH
To unlatch after a latched fault 100 µs
DIGITAL OUTPUT (PGOOD_)
Output Leakage Current V
PGOOD
_ = 13.2V 1 µA
Output Voltage Low V
OL
I
SINK
= 1mA 0.4 V
PGOOD_ Delay t
PGDLY
After t
START
, MON_ = V
IN_
0.75 ms
OUTPUT VOLTAGE MONITORS (MON1, MON2)
Overvoltage 657 687 707
MON_ Trip Threshold V
MON
Undervoltage 513 543 563
mV
MON_ Glitch Filter 20 µs
MON_ Input Bias Current V
MON_
= 600mV 0.03 µA
UNDERVOLTAGE LOCKOUT (UVLO)
Startup is initiated when this threshold is
reached by V
IN1
or V
IN2
, V
ON
_ > 0.875V
2.10 2.4 2.67 V
UVLO Threshold V
UVLO
Hysteresis 100 mV
UVLO Glitch Filter Reset Time
V
IN_
toggled below UVLO to unlatch after a
fault
100 µs
UVLO to Startup Delay t
D
,
UVLO
V
IN_
step from 0 to 2.8V 20 37.5 66 ms
SHUTDOWN LATCH/RESTART
Autoretry Delay t
RETRY
Delay time to restart after fault shutdown 64 x t
START
ms
Note 1: All devices are 100% tested at T
A
= +25°C and T
A
= +85°C. Limits at T
A
= 0°C and -40°C are guaranteed by design.
Note 2: The MAX5955/MAX5956 slow-comparator threshold is adjustable. V
SC,TH
= R
LIM
 0.25µA + 25mV (see the Typical
Operating Characteristics
).
Note 3: The current-limit slow-comparator response time is weighted against the amount of overcurrent; the higher the overcurrent
condition, the faster the response time (see the
Typical Operating Characteristics) .
Note 4: The startup period (t
START
) is the time during which the slow comparator is ignored and the device acts as a current-limiter
by regulating the sense current with the fast comparator (see the
Startup Period section).
Note 5: The current available at GATE is a function of V
GATE
(see the Typical Operating Characteristics ).