MAX5929AEEG+ Maxim Integrated Products, MAX5929AEEG+ Datasheet - Page 16

• Manufacturer Part Number: MAX5929AEEG+
• Description: IC HOT SWAP CTLR QUAD 24QSOP
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5929AEEG+

• 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: 24-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

t
backplane and that the input voltages are
stable. MAX5927A/MAX5929A–MAX5929D include a
UVLO glitch filter, t
and transients. Bringing all input supplies below the
UVLO threshold for longer than t
and the startup period, t
example of automatic turn-on function.
The MAX5929A/MAX5929B always latch the external
MOSFETs off when an overcurrent fault is detected,
and the MAX5929C/MAX5929D are always in autoretry
mode. The MAX5927A can be configured to either latch
the external MOSFETs off or to autoretry (see Table 2).
Toggling ON_ below 0.875V for at least 100µs clears
the MAX5929A/MAX5929B or MAX5927A (LATCH =
unconnected) fault and reinitiates the startup period.
Similarly, the MAX5929C/MAX5929D or MAX5927A
(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 MAX5927A (see Table 3). Tables 4 and 5 con-
tain the MAX5927A/MAX5929A–MAX5929D truth tables.
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Table 2. Selecting Fault Management
Mode (MAX5927A)
Table 3. Selecting STAT_ Polarity
(MAX5927A)
16
D,UVLO
Low
Unconnected
Unconnected
Low
Latched and Autoretry Fault Management
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
LATCH
POL
ensures that the board is fully inserted into the
START
.
Fault condition latches MOSFETs off
Autoretry mode
D,GF
Asserts low
Asserts high (open drain)
, to reject all input voltage noise
Status Outputs (STAT_)
FAULT MANAGEMENT
START
D,GF
. See Figure 8 for an
STAT_
reinitiates t
START
D,UVLO
has
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.
Figure 8. Automatic Turn-On when Input Voltages are Above
their Respective Undervoltage Lockout Threshold (Provided
t
D
ON1
ON2
ON3
ON4
GND
,
UVLO
V
V
V
V
1
2
3
4
BACKPLANE
Requirement is Met)
DS(ON)
Applications Information
REMOVABLE CARD
causes output ripple if there is a
Component Selection
n-Channel MOSFETs
ON1
ON2
ON3
ON4
GND
MAX5929C
MAX5929D
MAX5927A
MAX5929A
MAX5929B
DS(ON)
)