MAX5955AEEE Maxim Integrated Products, MAX5955AEEE Datasheet

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MAX5955AEEE

Manufacturer Part Number
MAX5955AEEE
Description
Hot Swap & Power Distribution
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX5955AEEE

Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX5955AEEE
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX5955AEEE+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
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.
Base Station Line Cards
Network Switches,
Routers, Hubs
Solid-State Circuit
Breakers
RAID
19-3813; Rev 0; 9/05
Variable Speed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
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.
Controllers with Independent On/Off Control
________________________________________________________________ Maxim Integrated Products
General Description
Power-Supply Sequencing
Hot Plug-In Daughter
Cards
Portable Computer Device
Bays (Docking Stations)
Applications
Low-Voltage, Dual Hot-Swap
♦ Safe Hot Swap for +1V to +13.2V Power Supplies
♦ Independent On/Off Control for Each Channel
♦ Internal Charge Pumps Generate n-Channel
♦ Inrush Current Regulated at Startup
♦ Circuit-Breaker Function
♦ Adjustable Circuit Breaker/Current-Limit
♦ VariableSpeed/BiLevel Circuit Breaker Response
♦ Autoretry or Latched Fault Management
♦ Status Outputs Indicate Fault/Safe Condition
♦ Output Undervoltage and Overvoltage Monitoring
+Denotes lead-free package.
Ordering Information continued at end of data sheet.
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
MAX5955AEEE
MAX5955AEEE+
MAX5955AUEE
MAX5955AUEE+
MAX5955BEEE
MAX5955BEEE+
MAX5955BUEE
MAX5955BUEE+
with V
MOSFET Gate Drives
Threshold from 25mV to 100mV
or Protection
TOP VIEW
PART
IN1
PGOOD1
or V
SENSE1
GATE1
MON1
LIM1
GND
TIM
IN1
IN2
1
2
3
4
5
6
7
8
≥ 2.7V
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
MAX5955
MAX5956
QSOP
Pin Configuration
16
15
14
13
12
11
10
9
PGOOD2
ON2
IN2
SENSE2
GATE2
ON1
LIM2
MON2
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
Features
1

Related parts for MAX5955AEEE

MAX5955AEEE Summary of contents

Page 1

... Threshold from 25mV to 100mV ♦ VariableSpeed/BiLevel Circuit Breaker Response ♦ Autoretry or Latched Fault Management ♦ Status Outputs Indicate Fault/Safe Condition ♦ Output Undervoltage and Overvoltage Monitoring or Protection PART MAX5955AEEE MAX5955AEEE+ MAX5955AUEE MAX5955AUEE+ MAX5955BEEE MAX5955BEEE+ MAX5955BUEE MAX5955BUEE+ +Denotes lead-free package. Ordering Information continued at end of data sheet. ...

Page 2

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control ABSOLUTE MAXIMUM RATINGS IN_ to GND...........................................................................+14V GATE_ to GND ...........................................-0. ON_, PGOOD_, TIM to GND.......................-0.3V to the higher 0.3V) and (V IN1 SENSE_, MON_, LIM_ to GND ...

Page 3

Low-Voltage, Dual Hot-Swap Controllers with ELECTRICAL CHARACTERISTICS (continued +1V to +13.2V provided at least one supply is higher than +2.7V, V IN_ noted. Typical values are +5V, V IN1 PARAMETER SYMBOL ON_ Input Bias Current ...

Page 4

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control (Typical Operating Circuits Fairchild FDB7090L, V otherwise noted. Channels 1 and 2 are identical in performance. Where characteristics are interchangeable, channels 1 and 2 are referred to as ...

Page 5

Low-Voltage, Dual Hot-Swap Controllers with (Typical Operating Circuits Fairchild FDB7090L, V otherwise noted. Channels 1 and 2 are identical in performance. Where characteristics are interchangeable, channels 1 and 2 are referred and Y.) ...

Page 6

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control PIN NAME Channel 1 Status Output (Open Drain, see the Absolute Maximum Ratings). PGOOD1 asserts high when hot 1 PGOOD1 swap is successful and channel 1 is within regulation. PGOOD1 asserts low ...

Page 7

Low-Voltage, Dual Hot-Swap Controllers with Figure 1. Functional Diagram _______________________________________________________________________________________ Independent On/Off Control 7 ...

Page 8

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control R sets the duration of the startup period from 0.45s TIM to 50ms (see the Setting the Startup Period, RTIM sec- tion). The default startup period is fixed at 9ms when TIM ...

Page 9

Low-Voltage, Dual Hot-Swap Controllers with 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 (V from 25mV to 100mV. The slow-comparator response time decreases ...

Page 10

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control Table 1. Status Output Truth Table OVERCURRENT OVERCURRENT PART FAULT (V ) FAULT (V OUT1 Yes MAX5955 X UV/OV X Protection X Yes MAX5956 X UV/OV X Monitor X Applications Information Component ...

Page 11

Low-Voltage, Dual Hot-Swap Controllers with Table 3. Component Manufacturers COMPONENT Dale-Vishay Sense Resistors IRC Fairchild MOSFETs International Rectifier Motorola Setting the Startup Period, R The startup period ( adjustable from 0.45ms to START 50ms. The adjustable startup period ...

Page 12

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control C = 6µF and the load does not draw any current BOARD during the startup period. With no gate capacitor the inrush current, charge, and discharge times are: µ ...

Page 13

... SENSE_ GATE_ MAX5955 MAX5956 ON_ * * * * REQUIRED COMPONENTS. SEE THE ON_ COMPARATORS SECTION. Figure 5. Using the MAX5955/MAX5956 on a Backplane PART MAX5955AEEE MAX5955AUEE MAX5955BEEE MAX5955BUEE MAX5956AEEE MAX5956AUEE MAX5956BEEE MAX5956BUEE ______________________________________________________________________________________ Independent On/Off Control When the output is short circuited, the voltage drop across the external MOSFET becomes large. Hence, the power dissipation across the switch increases, as does the die temperature ...

Page 14

Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off Control V IN1 0.1µF * ON1 * ON2 PGOOD1 PGOOD2 GND V IN2 0.1µF * REQUIRED COMPONENTS. SEE THE ON_ COMPARATORS SECTION. Ordering Information (continued) PART TEMP RANGE MAX5956AEEE -40°C to +85°C MAX5956AEEE+ ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2005 Maxim Integrated Products ...

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