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PDF MAX5906 Data sheet ( Hoja de datos )
| Número de pieza | MAX5906 | |
| Descripción | Low-Voltage / Dual Hot-Swap Controllers/Power Sequencers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX5906 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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19-2238; Rev 3; 9/05
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
General Description
Features
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.
Applications
PCI-Express® Applications
Basestation Line Cards
♦ Safe Hot-Swap for +1V to +13.2V Power
Supplies
Requires One Input ≥ 2.7V
♦ Low 25mV Default Current-Limit Threshold
♦ Inrush Current Regulated at Startup
♦ Circuit Breaker Function
♦ Adjustable Circuit Breaker/Current-Limit
Threshold
♦ VariableSpeed/BiLevel Circuit-Breaker Response
♦ Autoretry or Latched Fault Management
♦ On/Off Sequence Programming
♦ Status Output Indicates Fault/Safe Condition
♦ Output Undervoltage and Overvoltage Monitoring
and/or Protection
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX5904ESA*
MAX5904USA
-40°C to +85°C
0°C to +85°C
8 SO
8 SO
S8-4
S8-4
MAX5905ESA*
MAX5905USA
MAX5906EEE*
-40°C to +85°C
0°C to +85°C
-40°C to +85°C
8 SO
8 SO
16 QSOP
S8-4
S8-4
E16-1
MAX5906UEE
MAX5907EEE*
0°C to +85°C
-40°C to +85°C
16 QSOP
16 QSOP
E16-1
E16-1
MAX5907UEE
MAX5908EEE*
0°C to +85°C
-40°C to +85°C
16 QSOP
16 QSOP
E16-1
E16-1
MAX5908UEE
0°C to +85°C 16 QSOP
E16-1
MAX5909EEE* -40°C to +85°C 16 QSOP
E16-1
MAX5909UEE
0°C to +85°C 16 QSOP
E16-1
*Contact factory for availability.
Pin Configurations
TOP VIEW
Network Switches or Routers
IN1 1
8 IN2
Solid-State Circuit Breaker
Power-Supply Sequencing
SENSE1 2
GATE1 3
MAX5904
MAX5905
7 SENSE2
6 GATE2
Hot Plug-In Daughter Cards
GND 4
5 ON
RAID
VariableSpeed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
NARROW SO
Pin Configurations continued at end of data sheet.
PCI-Express is a registered trademark of PCI-SIG Corp.
Selector Guide and Typical Operating Circuits appear at end
of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
ELECTRICAL CHARACTERISTICS (continued)
(VIN_ = +1V to +13.2V provided at least one supply is higher than +2.7V, VON = +2.7V, TA = -40°C to +85°C, unless otherwise noted.
Typical values are at VIN1 = +5V, VIN2 = +3.3V, and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
VON < 4.5V
ON Input Bias Current
ON Pulse-Width Low
IBON
tUNLATCH
VIN1 = VIN2 = +13.2V VON > 4.5V
VON = 4V
To unlatch after a latched fault
DIGITAL OUTPUT (PGOOD)
Output Leakage Current
VPGOOD = 13.2V
Output-Voltage Low
PGOOD Delay
VOL
tPGDLY
ISINK = 1mA
After tSTART, MON_ = VIN_
OUTPUT VOLTAGE MONITORS (MON1, MON2)
MON_ Trip Threshold
Overvoltage
VMON_
Undervoltage
MON_ Glitch Filter
MON_ Input Bias Current
UNDERVOLTAGE LOCKOUT (UVLO)
VMON_ = 600mV
UVLO Threshold
VUVLO
Startup is initiated when this threshold is reached
by VIN1 or VIN2, VON > 0.8V, VIN_ increasing
Hysteresis
UVLO Glitch Filter Reset Time
VIN_ = 0V, to unlatch after a fault
UVLO to Startup Delay
SHUTDOWN RESTART
tD,UVLO VIN_ step from 0 to 2.8V
MIN
100
655
513
2.1
100
18
TYP
0.03
100
0.03
0.75
687
543
20
0.03
2.4
100
37.5
MAX UNITS
µA
1
µs
1 µA
0.4 V
ms
710
mV
567
µs
µA
2.67 V
mV
µs
64 ms
Autoretry Delay
tRETRY
Delay time to restart after a fault shutdown
MAX5904/MAX5906/MAX5908
64 x tSTART
ms
UNCOMMITTED COMPARATOR
INC+ Trip Threshold Voltage
Propagation Delay
OUTC Voltage Low
INC+ Bias Current
OUTC Leakage Current
VC,TH
VOL
IOUTC
Low to high
Hysteresis
10mV overdrive
ISINK = 1mA
VINC+ = 5V
VOUTC = 13.2V
1.206
1.25
10
50
0.02
0.02
1.290
0.4
1
1
V
mV
µs
V
µA
µA
Note 1: Limits are 100% tested at TA = +25°C and +85°C. Limits at 0°C and -40° are guaranteed by characterization and are not produc-
tion tested.
Note 2: VIN rising slew rate must be less than 0.2V/µs.
Note 3: The MAX5906–MAX5909 slow-comparator threshold is adjustable. VSC,TH = RLIM x 0.25µA + 25mV (see the Typical
Operating Characteristics).
Note 4: The current-limit slow-comparator response time is weighted against the amount of overcurrent; the higher the overcurrent
condition, the faster the response time. See the Typical Operating Characteristics.
Note 5: The startup period (tSTART) is the time during which the slow comparator is ignored and the device acts as a current limiter
by regulating the sense current with the fast comparator. See the Startup Period section.
_______________________________________________________________________________________ 5
5 Page 
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
ON
PGOOD
tSTART + tPGDLY
4.8V TO 5.8V
VGATE
VOUT
VSU,TH
RSENSE
VTH
ILOAD
tON
Figure 2. Startup Waveforms
CBOARD = LARGE
CBOARD = 0
VGATE
VOUT
Slow-Comparator Startup Period
The slow comparator is disabled during the startup
period while the external MOSFETs are turning on.
Disabling the slow comparator allows the device to
ignore the higher-than-normal inrush current charging
the board capacitors when a card is first plugged into a
live backplane.
Slow-Comparator Normal Operation
After the startup period is complete the slow compara-
tor is enabled and the device enters normal operation.
The comparator threshold voltage (VSC,TH) is fixed at
25mV for the MAX5904/MAX5905 and is adjustable
from 25mV to 100mV for the MAX5906–MAX5909. The
slow-comparator response time decreases to a mini-
mum of 110µs with a large overdrive voltage (Figure 9).
Response time is 3ms for a 1mV overdrive. The variable
speed response time allows the MAX5904–MAX5909 to
ignore low-amplitude momentary glitches, thus increas-
ing system noise immunity. After an extended overcur-
rent condition, a fault is generated, PGOOD is pulled
low, and the MOSFET gates are discharged with a
strong 3mA pulldown current.
Fast-Comparator Startup Period
During the startup period the fast comparator regulates
the gate voltage to ensure that the voltage across the
sense resistor does not exceed VSU,TH. The startup
fast-comparator threshold voltage (VSU,TH) is scaled to
two times the slow-comparator threshold (VSC,TH).
Fast-Comparator Normal Operation
In normal operation, if the load current reaches the fast-
comparator threshold, a fault is generated, PGOOD is
pulled low, and the MOSFET gates are discharged with
a strong 3mA pulldown current. This happens in the
event of a serious current overload or a dead short. The
fast-comparator threshold voltage (VFC,TH) is scaled to
four times the slow-comparator threshold (VSC,TH). This
comparator has a fast response time of 260ns (Figure 9).
Undervoltage Lockout (UVLO)
The undervoltage lockout prevents the MAX5904–
MAX5909 from turning on the external MOSFETs until
one input voltage exceeds the UVLO threshold (2.4V)
for tD,UVLO. The MAX5904–MAX5909 use power from
the higher input voltage rail for the charge pumps. This
allows for more efficient charge-pump operation. The
UVLO protects the external MOSFETs from an insuffi-
cient gate drive voltage. tD,UVLO ensures that the board
is fully inserted into the backplane and that the input
voltages are stable. Any input voltage transient on both
supplies below the UVLO threshold will reinitiate the
tD,UVLO and the startup period.
Latched and Autoretry Fault Management
The MAX5905/MAX5907/MAX5909 latch the external
MOSFETs off when a fault is detected. Toggling ON
below 0.4V or one of the supply voltages below the
UVLO threshold for at least 100µs clears the fault latch
and reinitiates the startup period. Similarly, the
MAX5904/MAX5906/MAX5908 turn the external
MOSFETs off when a fault is detected then automatical-
ly restart after the autoretry delay that is internally set to
64 times tSTART. During the autoretry delay, toggling
ON below 0.4V does not clear the fault. The autoretry
can be overridden causing the startup period to begin
immediately by toggling one of the supply voltages
below the UVLO threshold.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX5906.PDF ] | |
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