MAX5924DEUB+ Maxim Integrated Products, MAX5924DEUB+ Datasheet - Page 11

• Manufacturer Part Number: MAX5924DEUB+
• Description: IC HOT-SWAP CTRLR N-CH 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5924DEUB+

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 1 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5924/MAX5925/MAX5926 are hot-swap con-
troller ICs designed for applications where a line card is
inserted into a live backplane. Normally, when a line card
is plugged into a live backplane, the card’s discharged
filter capacitors provide a low impedance that can
momentarily cause the main power supply to collapse.
The MAX5924/MAX5925/MAX5926 are designed to
reside either in the backplane or in the removable card
to provide inrush current limiting and short-circuit pro-
tection. This is achieved using an external n-channel
MOSFET and an optional external current-sense resistor.
Several critical parameters can be configured:
See the Selector Guide for a device-specific list of fac-
tory-preset features and parameters.
It is important that both V
rate of 100mV/ms during the critical time when power
voltages are below those values required for proper
logic control of internal circuitry. This applies for 0.5V ≤
V
true when LATCH is tied high.
The MAX5924/MAX5925/MAX5926 control an external
MOSFET placed in the positive power-supply pathway.
When power is first applied, the MAX5924/MAX5925/
MAX5926 hold the MOSFET off indefinitely if the supply
voltage is below the undervoltage lockout level or if the
device is disabled (see the EN (MAX5924/MAX5925),
EN1/EN2 (MAX5926) section). If neither of these condi-
tions exist, the device enters a UVLO startup delay
period for ≈200ms. Next, the MAX5924/MAX5925/
MAX5926 detect whether an external sense resistor is
present; and then autoconfigure accordingly (see
Figure 4).
• If no sense resistor is present, bilevel fault protection
CC
• Slew rate (inrush current)
• Circuit-breaker threshold
• Turn-on voltage
• Fault-management mode (MAX5926)
• Circuit-breaker temperature coefficient (MAX5926)
is disabled and load-probing circuitry is enabled
(see the Load Probing section).
If load probing is not successful, the fault is man-
aged according to the selected fault management
mode (see the Latched and Auto-Retry Fault
Management section).
If load probing (see the Load Probing section) is suc-
cessful, slew-rate limiting is employed to gradually
turn on the MOSFET.
≤ 2.5V and 0.5V ≤ V
1V to 13.2V, n-Channel Hot-Swap Controllers
______________________________________________________________________________________
Detailed Description
CC
S
≤ 0.8V. This is particularly
and V
S
rise at a minimum
Startup Mode
Require No Sense Resistor
• If the device detects an external R
During the startup phase, the voltage at the load, V
rises at a rate determined by the selected slew rate (see
the Slew Rate section). The inrush current, I
the load is limited to a level proportional to the load
capacitance, C
where SR is the slew rate in V/ms and C
itance in µF.
For operation with and without R
V
assert. When V
MAX5925/MAX5926 enable standard bilevel fault pro-
tection with normal I
section).
Figure 4. Startup Flow Chart
OUT
breaker threshold is set at 2xI
tor is disabled, the startup phase begins without
delay for load probing, and slew-rate limiting is
employed to gradually turn on the MOSFET.
YES
NO
NO
exceeds V
V
CC
SLEW-RATE-LIMITED
UVLO 200ms DELAY
V
RISES ABOVE V
DISABLE SLOW
I
ENABLE TRUE?
COMPARATOR
GS
CB,SU
YES
V
PRESENT?
GS
STARTUP
≥ V
R
SENSE
≥ V
L
= 2 x I
THPGOOD
GATE
, and the slew rate:
CB,EN
I
CB
INRUSH
CB,EN
UVLO
CB
- V
PGOOD
YES
(see the Bilevel Fault Protection
NO
OUT
, PGOOD and/or PGOOD
=
C
= V
DISABLE FAULT PROTECTION,
1000
L
BEGIN NORMAL OPERATION
ENABLE STANDARD BILEVEL
FAULT MANAGEMENT
×
ENABLE LOAD PROBE
CB
SUCCESSFUL?
FAULT PROTECTION
SENSE
CB,EN
SR
LOAD PROBE
, the slow compara-
YES
L
, the MAX5924/
, once V
SENSE
is load capac-
INRUSH
NO
, circuit-
GATE
OUT
, to
11
,
-