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MAX5955AEEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15
General Description
The MAX5955 and MAX5956 are +1V to +13.2V dual
hot-swap controllers with independent on/off control for
complete protection of dual-supply systems. They allow
the safe insertion and removal of circuit cards into live
backplanes. The MAX5955 and MAX5956 operate
down to 1V provided one of the inputs is above 2.7V.
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 MAX5955 and MAX5956 hot-swap controllers pre-
vent 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™ protection
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
MAX5955B and MAX5956B must be unlatched after a
fault, and the MAX5955A and MAX5956A automatically
restart after a fault.
The MAX5955 and MAX5956 integrate an on-board
charge pump to drive the gates of low-cost, external n-
channel MOSFETs. The devices offer integrated fea-
tures like startup current regulation and current glitch
protection to eliminate external timing resistors and
capacitors. These devices provide open-drain status
outputs, an adjustable startup timer, and adjustable
current limits. The MAX5955 provides output undervolt-
age/overvoltage protection for each channel, while the
MAX5956 provides undervoltage/overvoltage monitor-
ing for each channel.
The MAX5955 and MAX5956 are available in a space-
saving 16-pin QSOP package.
Applications
Features
o Safe Hot Swap for +1V to +13.2V Power Supplies
with V
IN1
or V
IN2
≥ 2.7V
o Independent On/Off Control for Each Channel
o Internal Charge Pumps Generate n-Channel
MOSFET Gate Drives
o Inrush Current Regulated at Startup
o Circuit-Breaker Function
o Adjustable Circuit Breaker/Current-Limit
Threshold from 25mV to 100mV
o VariableSpeed/BiLevel Circuit Breaker Response
o Autoretry or Latched Fault Management
o Status Outputs Indicate Fault/Safe Condition
o Output Undervoltage and Overvoltage Monitoring
or Protection
MAX5955/MAX5956
Low-Voltage, Dual Hot-Swap
Controllers with Independent On/Off Control
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PGOOD1 PGOOD2
ON2
IN2
SENSE2
GATE2
ON1
LIM2
MON2
TOP VIEW
MAX5955
MAX5956
QSOP
TIM
IN1
GND
SENSE1
GATE1
LIM1
MON1
Pin Configuration
19-3813; Rev 0; 9/05
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX5955AEEE -40°C to +85°C 16 QSOP
MAX5955AEEE+ -40°C to +85°C 16 QSOP
MAX5955AUEE 0°C to +85°C 16 QSOP
MAX5955AUEE+ 0°C to +85°C 16 QSOP
MAX5955BEEE -40°C to +85°C 16 QSOP
MAX5955BEEE+ -40°C to +85°C 16 QSOP
MAX5955BUEE 0°C to +85°C 16 QSOP
MAX5955BUEE+ 0°C to +85°C 16 QSOP
Variable Speed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
+
Denotes lead-free package.
Ordering Information continued at end of data sheet.
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Base Station Line Cards
Network Switches,
Routers, Hubs
Solid-State Circuit
Breakers
RAID
Power-Supply Sequencing
Hot Plug-In Daughter
Cards
Portable Computer Device
Bays (Docking Stations)
MAX5955/MAX5956
Low-Voltage, Dual Hot-Swap Controllers with
Independent On/Off Control
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN_
= +1V to +13.2V provided at least one supply is higher than +2.7V, V
ON1
= V
ON2
= +2.7V, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
IN1
= +5V, V
IN2
= +3.3V, and T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN_ to GND...........................................................................+14V
GATE_ to GND ...........................................-0.3V to (V
IN_
+ 6.2V)
ON_, PGOOD_, TIM to GND.......................-0.3V to the higher of
(V
IN1
+ 0.3V) and (V
IN2
+ 0.3V)
SENSE_, MON_, LIM_ to GND ...................-0.3V to (V
IN_
+ 0.3V)
Current into Any Pin .........................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Range
MAX59_ _ _U_ _...................................................0°C to +85°C
MAX59_ _ _E_ _ ................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLIES
IN_ Input Voltage Range V
IN
Other V
IN
≥ +2.7V 1.0 13.2 V
Supply Current I
IN
I
IN1
+ I
IN2
, V
IN1
= +5V, V
IN2
= +3.3V 1.2 2.3 mA
CURRENT CONTROL
T
A
= +25°C 22.5 25 27.5
LIM = GND
T
A
= -40°C to +85°C 20.5 27.5
Slow-Comparator Threshold
(V
IN
_ - V
SENSE
_) (Note 2)
V
SC,TH
R
LIM
= 300kΩ 80 100 130
mV
1mV overdrive 3 ms
Slow-Comparator Response Time
(Note 3)
t
SCD
10mV overdrive 110 µs
V
SU,TH
During startup 2 x V
SC
,
TH
Fast-Comparator Threshold
(V
IN
_ - V
SENSE
_)
V
FC,TH
V
IN
_ - V
SENSE
_; normal operation 4 x V
SC
,
TH
mV
Fast-Comparator Response Time
(V
IN
_ - V
SENSE
_)
t
FCD
10mV overdrive, from overload condition 260 ns
SENSE Input Bias Current I
B SENSE
V
SENSE
_ = V
IN
_ 0.03 1 µA
MOSFET DRIVER
R
TI M
= 100kΩ 6 10.8 16
R
TIM
= 4kΩ (minimum value) 0.31 0.45 0.58
Startup Period (Note 4) t
START
TIM floating 4 9 17
ms
C har g i ng , V
GATE
_ = + 5V , V
IN
_ = + 10V ( N ote 5) 65 100 130 µA
Average Gate Current I
GATE
Discharging, triggered by a fault or when
V
ON_
< 0.875V
3mA
V
IN
_ = 3V to 13.2V 4.8 5.4 6.0
Gate-Drive Voltage V
DRIVE
V
GATE_
- V
IN
_,
I
GATE_
< 1µA
V
IN
_ = 2.7V to 3.0V 4.1 5.0 6.0
V
ON_ COMPARATOR
Low to high 0.85 0.875 0.90 V
ON_ Threshold V
ON_
,
TH
Hysteresis 25 mV
ON_ Propagation Delay 10mV overdrive 50 µs
MAX5955/MAX5956
Low-Voltage, Dual Hot-Swap Controllers with
Independent On/Off Control
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN_
= +1V to +13.2V provided at least one supply is higher than +2.7V, V
ON1
= V
ON2
= +2.7V, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
IN1
= +5V, V
IN2
= +3.3V, and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
ON_
< 4.5V 0.03
V
ON_
> 4.5V 100ON_ Input Bias Current I
BON
V
IN1
= V
IN2
= +13.2V
V
ON_
= 4.5V 0.03 1
µA
ON_ Pulse-Width Low t
UNLATCH
To unlatch after a latched fault 100 µs
DIGITAL OUTPUT (PGOOD_)
Output Leakage Current V
PGOOD
_ = 13.2V 1 µA
Output Voltage Low V
OL
I
SINK
= 1mA 0.4 V
PGOOD_ Delay t
PGDLY
After t
START
, MON_ = V
IN_
0.75 ms
OUTPUT VOLTAGE MONITORS (MON1, MON2)
Overvoltage 657 687 707
MON_ Trip Threshold V
MON
Undervoltage 513 543 563
mV
MON_ Glitch Filter 20 µs
MON_ Input Bias Current V
MON_
= 600mV 0.03 µA
UNDERVOLTAGE LOCKOUT (UVLO)
Startup is initiated when this threshold is
reached by V
IN1
or V
IN2
, V
ON
_ > 0.875V
2.10 2.4 2.67 V
UVLO Threshold V
UVLO
Hysteresis 100 mV
UVLO Glitch Filter Reset Time
V
IN_
toggled below UVLO to unlatch after a
fault
100 µs
UVLO to Startup Delay t
D
,
UVLO
V
IN_
step from 0 to 2.8V 20 37.5 66 ms
SHUTDOWN LATCH/RESTART
Autoretry Delay t
RETRY
Delay time to restart after fault shutdown 64 x t
START
ms
Note 1: All devices are 100% tested at T
A
= +25°C and T
A
= +85°C. Limits at T
A
= 0°C and -40°C are guaranteed by design.
Note 2: The MAX5955/MAX5956 slow-comparator threshold is adjustable. V
SC,TH
= R
LIM
0.25µA + 25mV (see the
Typical
Operating Characteristics
).
Note 3: 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 4: The startup period (t
START
) 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).
Note 5: The current available at GATE is a function of V
GATE
(see the
Typical Operating Characteristics
).
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX5955AEEE+T

Mfr. #:
Buy MAX5955AEEE+T
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers Dual Hot-Swap Controller
Lifecycle:
New from this manufacturer.
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