MAX5904 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers

19-2238; Rev 2; 11/03
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
General Description
The MAX5904–MAX5909 dual hot-swap controllers
provide complete protection for dual-supply systems.
These devices hot swap two supplies ranging from +1V
to +13.2V, provided one supply is at or above 2.7V,
allowing the safe insertion and removal of circuit cards
into live backplanes.
The discharged filter capacitors of the circuit card pro-
vide low impedance to the live backplane. High inrush
currents from the backplane to the circuit card can burn
up connectors and components, or momentarily col-
lapse the backplane power supply leading to a system
reset. The MAX5904 family of hot-swap controllers pre-
vents such problems by gradually ramping up the output
voltage and regulating the current to a preset limit when
the board is plugged in, allowing the system to stabilize
safely. After the startup cycle is completed, two on-chip
comparators provide VariableSpeed/BiLevel™ protec-
tion against short-circuit and overcurrent faults, as well
as immunity against system noise and load transients. In
the event of a fault condition, the load is disconnected.
The MAX5905/MAX5907/MAX5909 must be unlatched
after a fault, and the MAX5904/MAX5906/MAX5908 auto-
matically restart after a fault.
The MAX5904 family offers a variety of options to reduce
component count and design time. All devices integrate
an on-board charge pump to drive the gates of low-cost,
external N-channel MOSFETs. The devices offer integrat-
ed features like startup current regulation and current
glitch protection to eliminate external timing resistors and
capacitors. The MAX5906–MAX5909 provide an open-
drain status output, an adjustable startup timer, an
adjustable current limit, an uncommitted comparator,
and output undervoltage/overvoltage monitoring.
The MAX5904/MAX5905 are available in 8-pin SO pack-
ages. The MAX5906–MAX5909 are available in space-
saving 16-pin QSOP packages.
Features
o Safe Hot Swap for +1V to +13.2V Power
Supplies
Requires One Input ≥ 2.7V
o Low 25mV Default Current-Limit Threshold
o Inrush Current Regulated at Startup
o Circuit Breaker Function
o Adjustable Circuit Breaker/Current-Limit
Threshold
o VariableSpeed/BiLevel Circuit-Breaker Response
o Auto-Retry or Latched Fault Management
o On/Off Sequence Programming
o Status Output Indicates Fault/Safe Condition
o Output Undervoltage and Overvoltage Monitoring
and/or Protection
Ordering Information
PART
TEMP RANGE
MAX5904ESA*
-40°C to +85°C
MAX5904USA
0°C to +85°C
MAX5905ESA*
-40°C to +85°C
MAX5905USA
0°C to +85°C
MAX5906EEE*
-40°C to +85°C
MAX5906UEE
0°C to +85°C
MAX5907EEE*
-40°C to +85°C
MAX5907UEE
0°C to +85°C
MAX5908EEE*
-40°C to +85°C
MAX5908UEE
0°C to +85°C
MAX5909EEE*
-40°C to +85°C
MAX5909UEE
0°C to +85°C
*Contact factory for availability.
PIN-PACKAGE
8 SO
8 SO
8 SO
8 SO
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
Applications
Pin Configurations
PCI-Express Applications
Basestation Line Cards
Network Switches or Routers
Solid-State Circuit Breaker
Power-Supply Sequencing
Hot Plug-In Daughter Cards
RAID
VariableSpeed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
TOP VIEW
IN1 1
SENSE1 2
GATE1 3
GND 4
MAX5904
MAX5905
8 IN2
7 SENSE2
6 GATE2
5 ON
NARROW SO
Pin Configurations continued at end of data sheet.
Selector Guide and Typical Operating Circuits appear at end
of data sheet.
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