MAX5927 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers

19-2945; Rev 0; 8/03
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
General Description
The MAX5927/MAX5929 +1V to +13.2V quad hot-swap
controllers provide complete protection for multisupply
systems. They allow the safe insertion and removal of cir-
cuit cards into live backplanes. These devices hot swap
multiple supplies ranging from +1V to +13.2V, provided
one supply is at or above +2.7V and only one supply is
above +11.0V. The input voltage rails (channels) can be
configured to sequentially turn-on/off, track each other,
or have completely independent operation.
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 collapse
the backplane power supply leading to a system reset.
The MAX5927/MAX5929 hot-swap controllers prevent
such problems by gradually ramping up the output volt-
age 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 complete, on-chip com-
parators provide VariableSpeed/BiLevel™ protection
against short-circuit and overcurrent faults, and provide
immunity against system noise and load transients. The
load is disconnected in the event of a fault condition. The
MAX5929A automatically restarts after a fault condition,
while the MAX5929L must be unlatched. The MAX5927
fault management mode is selectable.
The MAX5927/MAX5929 offer a variety of options to
reduce external component count and design time. All
devices integrate an on-board charge pump to drive
the gates of low-cost external N-channel MOSFETs, an
adjustable startup timer, and an adjustable current limit.
The devices offer integrated features like startup cur-
rent regulation and current glitch protection to eliminate
external timing resistors and capacitors. The
MAX5929_L provides an open-drain active-low status
output for each channel, the MAX5929_H provides an
open-drain active-high status output for each channel,
and the MAX5927 status output polarity is selectable.
The MAX5927 is available in a 32-pin thin QFN package
and the MAX5929 is available in a 24-pin QSOP pack-
age. All devices are specified over the extended tem-
perature range, -40°C to +85°C.
Applications
PCI Express Hot Plug
Hot Plug-In Daughter Cards
RAID
Power-Supply
Sequencing/Tracking
Basestation Line Cards
Portable Computer Device
Bays (Docking Stations)
Network Switches, Routers,
Hubs
VariableSpeed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
Features
o Safe Hot Swap for +1V to +13.2V Power Supplies
with Any Input Voltage (V_{IN_} ≥ 2.7V and Only One
V_{IN_} > 11.0V)
o Adjustable Circuit Breaker/Current-Limit
Threshold from 25mV to 100mV
o Configurable Tracking, Sequencing, or
Independent Operation Modes
o VariableSpeed/BiLevel Circuit-Breaker Response
o Internal Charge Pumps Generate N-Channel
MOSFET Gate Drives
o Inrush Current Regulated at Startup
o Autoretry or Latched Fault Management
o Programmable Undervoltage Lockout
o Status Outputs Indicate Fault/Safe Condition
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5927ETJ
-40°C to +85°C
32 Thin QFN-EP**
MAX5929LHEEG*
MAX5929LLEEG*
-40°C to +85°C
-40°C to +85°C
24 QSOP
24 QSOP
MAX5929AHEEG*
MAX5929ALEEG*
-40°C to +85°C
-40°C to +85°C
24 QSOP
24 QSOP
*Future product—contact factory for availability.
**EP = Exposed paddle.
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Pin Configurations
TOP VIEW
IN1 1
SENSE1 2
GATE1 3
LIM4 4
IN4 5
SENSE4 6
GATE4 7
STAT1 8
MAX5927
24 IN2
23 SENSE2
22 GATE2
21 LIM3
20 N.C.
19 IN3
18 SENSE3
17 GATE3
THIN QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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