MAX5929AEEG+ Maxim Integrated Products, MAX5929AEEG+ Datasheet - Page 13

• 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

Figure 4. Power-Sequencing Fault Turn-Off
The MAX5927A/MAX5929A–MAX5929D turn off all
channels if any of the above conditions are not met.
After a fault-latched shutdown, cycle any of the ON_
inputs to unlatch and restart all channels, depending
on the corresponding V
Connect MODE to GND to enter independent mode.
While in independent mode, the MAX5927A/
MAX5929A–MAX5929D provide complete independent
control for each channel. To turn on a given channel:
• At least one V
• The corresponding V
• The corresponding V
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
*THE OUT_ DISCHARGE RATE IS A RESULT OF NATURAL DECAY
ON1 = ON2 = ON3 = ON4
OVERCURRENT
FAULT
CONDITION
OUT1
OUT2
OUT3
OUT4
OF THE LOAD RESISTANCE AND CAPACITANCE.
UVLO to startup delay (37.5ms).
(0.95V).
(0.875V).
IN_
must exceed V
ON_
IN_
ON_
state.
must exceed V
must exceed V
UVLO
Independent Mode
*
*
*
*
(2.45V) for the
Controllers/Power Sequencers
Low-Voltage, Quad, Hot-Swap
PWRRDY
ON,TH
The MAX5927A/MAX5929A–MAX5929D turn off the cor-
responding channel if any of the above conditions are
not met. During a fault condition on a given channel only,
the affected channel is disabled. After a fault-latched
shutdown, recycle the corresponding ON_ inputs to
unlatch and restart only the corresponding channel.
R
(R
the Startup Period, R
period is fixed at 9ms when TIM is floating. The startup
period begins after the turn-on conditions are met as
described in the Mode section, and the device is not
latched or in its autoretry delay (see the Latched and
Autoretry Fault Management section).
The MAX5927A/MAX5929A–MAX5929D limit the load
current if an overcurrent fault occurs during startup
instead of completely turning off the external MOSFETs.
The slow comparator is disabled during the startup
period and the load current can be limited in two ways:
1) Slowly enhancing the MOSFETs by limiting the
2) Limiting the voltage across the external current-
During the startup period, the gate-drive current is limit-
ed to 100µA and decreases with the increase of the
gate voltage (see the Typical Operating Characteristics ).
This allows the controller to slowly enhance the
MOSFETs. If the fast comparator detects an overcur-
rent, the MAX5927A/MAX5929A–MAX5929D regulate
the gate voltage to ensure that the voltage across the
sense resistor does not exceed V
regulates the inrush current during startup.
Figure 6 shows the startup waveforms. STAT_ is assert-
ed immediately after the startup period if no fault condi-
tion is present.
VariableSpeed/BiLevel fault protection incorporates
comparators with different thresholds and response
times to monitor the load current (Figure 7). During the
startup period, protection is provided by limiting the
load current. Protection is provided in normal operation
(after the startup period has expired) by discharging
the MOSFET gates with a 3mA/50mA pulldown current
in response to a fault condition. After a fault, STAT_ is
deasserted, the MAX5929A/MAX5929B stays latched
off and the MAX5929C/MAX5929D automatically
restart. Use the MAX5927A LATCH input to control
whether the STAT_ outputs latch off or autoretry after a
fault condition (see the Latched and Autoretry Fault
Management section).
TIM
TIM
MOSFET gate-charging current.
sense resistor.
VariableSpeed/BiLevel Fault Protection
sets the duration of the startup period from 0.4ms
= 4kΩ) to 50ms (R
TIM
TIM
section). The default startup
= 500kΩ) (see the Setting
SU,TH
Startup Period
. This effectively
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