MAX5931AEEP+ Maxim Integrated Products, MAX5931AEEP+ Datasheet - Page 16

• 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

Select the external MOSFETs according to the applica-
tion’s current levels. Table 6 lists recommended com-
ponents. The MOSFET’s on-resistance (R
should be chosen low enough to have a minimum volt-
age drop at full load to limit the MOSFET power dissi-
pation. High R
pulsating load. Determine the device power rating to
accommodate a short-circuit condition on the board at
startup and when the device is in autoretry mode (see
the MOSFET Thermal Considerations section).
Using these devices in latched mode allows the use of
MOSFETs with lower power ratings. A MOSFET typical-
ly withstands single-shot pulses with higher dissipation
than the specified package rating. Table 7 lists some
recommended MOSFET manufacturers.
The slow-comparator threshold voltage is adjustable
from 25mV to 100mV. Select a sense resistor that caus-
es a drop equal to the slow-comparator threshold volt-
age at a current level above the maximum normal
operating current. Typically, set the overload current at
1.2 to 1.5 times the full load current. The fast-compara-
tor threshold is two times the slow-comparator thresh-
old in normal operating mode. Choose the sense-
resistor power rating to be greater than or equal to 2 x
(I
ed sense-resistor manufacturers.
Low-Voltage, Triple, Hot-Swap Controllers/
Power Sequencers/Voltage Trackers
Table 2. Selecting Fault-Management
Mode (MAX5930A)
Table 3. Selecting STAT_ Polarity
(MAX5930A)
16
Unconnected
Low
Low
Unconnected
OVERLOAD
______________________________________________________________________________________
LATCH
POL
) x V
DS(ON)
Applications Information
SC,TH
Fault condition latches MOSFETs off
Autoretry mode
Asserts low
Asserts high (open-drain)
causes output ripple if there is a
. Table 7 lists some recommend-
FAULT MANAGEMENT
Component Selection
n-Channel MOSFETs
STAT_
Sense Resistor
DS(ON)
)
The slow-comparator threshold voltage is adjustable
from 25mV to 100mV, allowing designers to fine-tune
the current-limit threshold for use with standard-value
sense resistors. Low slow-comparator thresholds allow
for increased efficiency by reducing the power dissi-
pated by the sense resistor. Furthermore, the low 25mV
slow-comparator threshold is beneficial when operating
with supply rails down to 1V because it allows a small
percentage of the overall output voltage to be used for
current sensing. The VariableSpeed/BiLevel fault pro-
tection feature offers inherent system immunity against
load transients and noise. This allows the slow-com-
parator threshold to be set close to the maximum nor-
mal operating level without experiencing nuisance
faults. To adjust the slow-comparator threshold, calcu-
late R
where V
voltage. Shorting LIM_ to GND sets V
not leave LIM_ unconnected.
Figure 8. Automatic Turn-On When Input Voltages are Above
their Respective Undervoltage Lockout Threshold (Provided
t
D,UVLO
GND
ON1
ON2
ON3
V
V
V
1
2
3
BACKPLANE
Slow-Comparator Threshold, R
LIM_
Requirement is Met)
TH
as follows:
is the desired slow-comparator threshold
REMOVABLE CARD
R
LIM
_
=
V
TH
7 5
.
−
μ
25
A
mV
ON1
ON2
ON3
LIM_
TH
GND
MAX5930A
MAX5931A
MAX5931B
(MAX5930A)
to 25mV. Do