MAX5931AEEP+ Maxim Integrated Products, MAX5931AEEP+ Datasheet - Page 15

• Manufacturer Part Number: MAX5931AEEP+
• Description: IC HOT-SWAP CTRLR TRPL 20-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5931AEEP+

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 1 V ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP (0.154", 3.91mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In normal operation, if the load current reaches the fast-
comparator threshold, a fault is generated, STAT_ is
deasserted, and the MOSFET gates are discharged
with a strong 50mA pulldown current. This happens in
the event of a serious current overload or a dead short.
The fast-comparator threshold voltage (V
scaled to two times the slow-comparator threshold
(V
200ns (Figure 7).
The UVLO prevents the MAX5930A/MAX5931A/
MAX5931B from turning on the external MOSFETs until
one input voltage exceeds the UVLO threshold (2.45V)
for t
power from the highest input voltage rail for the charge
pumps. This allows for more efficient charge-pump oper-
ation. The highest V
The UVLO protects the external MOSFETs from an insuffi-
cient gate-drive voltage. t
is fully inserted into the backplane and that the input volt-
ages are stable. The MAX5930A/MAX5931A/MAX5931B
include a UVLO glitch filter (t
age noise and transients. Bringing all input supplies
Figure 6. Independent-Mode Startup Waveforms
SC,TH
V
ON_
STAT_
V
I
OUT_
LOAD_
GATE_
V
R
D,UVLO
FC,TH
SENSE_
). This comparator has a fast response time of
. The MAX5930A/MAX5931A/MAX5931B use
Low-Voltage, Triple, Hot-Swap Controllers/
Undervoltage Lockout (UVLO)
Fast-Comparator Normal Operation
______________________________________________________________________________________
IN_
t
ON
is provided as an output at BIAS.
V
TH
D,UVLO
t
START
D,GF
Power Sequencers/Voltage Trackers
) to reject all input volt-
ensures that the board
V
DRIVE
C
C
BOARD_
BOARD_
= LARGE
= 0
FC,TH
V
V
GATE_
OUT_
) is
below the UVLO threshold for longer than t
t
an example of automatic turn-on function.
The MAX5930A can be configured to latch the external
MOSFETs off or to autoretry (see Table 2). Toggling
ON_ below 0.875V for at least 100µs clears the
MAX5930A/MAX5931A/MAX5931B (LATCH = uncon-
nected) fault and reinitiates the startup period.
Similarly, the MAX5930A/MAX5931A/MAX5931B
(LATCH = GND) turn the external MOSFETs off when
an overcurrent fault is detected, then automatically
restart after the autoretry delay that is internally set to
64 times t
The status (STAT_) outputs are open-drain outputs that
assert when hot swap is successful and t
elapsed. STAT_ deasserts if ON_ is low or if the chan-
nel is turned off for any fault condition.
The polarity of the STAT_ outputs is selected using POL
for the MAX5930A (see Table 3). Tables 4 and 5 con-
tain the MAX5930A/MAX5931A/MAX5931B truth tables.
Figure 7. VariableSpeed/BiLevel Response
D,UVLO
Latched and Autoretry Fault Management
130μs
200ns
3ms
and the startup period, t
START
V
SC,TH
.
SENSE VOLTAGE (V
COMPARATOR
SLOW
Status Outputs (STAT_)
IN
- V
SENSE
START
(2 x V
)
V
FC,TH
SC,TH
. See Figure 8 for
)
COMPARATOR
D,GF
FAST
START
reinitiates
has
15