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Swap Controller. LTC4282 Datasheet

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Swap Controller. LTC4282 Datasheet






LTC4282 Controller. Datasheet pdf. Equivalent




LTC4282 Controller. Datasheet pdf. Equivalent





Part

LTC4282

Description

High Current Hot Swap Controller



Feature


LTC4282 High Current Hot Swap Controlle r with I2C Compatible Monitoring FEATU RES n Allows Safe Board Insertion Into Live Backplane n 12-/16-Bit ADC with ± 0.7% Total Unadjusted Error n Monitors Current, Voltage, Power and Energy n Co ntrols Two Parallel N-Channel MOSFETs f or SOA Sharing in High Current Applicat ions n Internal EEPROM for Nonvolatile Configuration n Wid.
Manufacture

Analog Devices

Datasheet
Download LTC4282 Datasheet


Analog Devices LTC4282

LTC4282; e Operating Voltage Range: 2.9V to 33V n I2C/SMBus Digital Interface (Coexists with PMBus Devices) n 12V Gate Drive fo r Lower MOSFET RDS(ON) n Programmable C urrent Limit with 2% Accuracy n MOSFET Power Limiting with Current Foldback n Continuously Monitors MOSFET Health n S tores Minimum and Maximum Measurements n Alerts When Alarm Thresholds Exceeded n Input Overvolta.


Analog Devices LTC4282

ge and Undervoltage Protection n Interna l ±5% or External Timebases n 32-Pin 5 mm × 5mm QFN Package n AEC-Q100 Qualif ied for Automotive Applications APPLICA TIONS n Enterprise Servers and Data Sto rage Systems n Network Routers and Swit ches n Base Stations n Platform Managem ent DESCRIPTION The LTC®4282 hot swap controller allows a board to be safely inserted and removed.


Analog Devices LTC4282

from a live backplane. Using one or mor e external N-channel pass transistors, board supply voltage and inrush current are ramped up at an adjustable rate. A n I2C interface and onboard ADC allows for monitoring of board current, voltag e, power, energy and fault status. The device features analog foldback current limiting and supply monitoring for app lications from 2.9.

Part

LTC4282

Description

High Current Hot Swap Controller



Feature


LTC4282 High Current Hot Swap Controlle r with I2C Compatible Monitoring FEATU RES n Allows Safe Board Insertion Into Live Backplane n 12-/16-Bit ADC with ± 0.7% Total Unadjusted Error n Monitors Current, Voltage, Power and Energy n Co ntrols Two Parallel N-Channel MOSFETs f or SOA Sharing in High Current Applicat ions n Internal EEPROM for Nonvolatile Configuration n Wid.
Manufacture

Analog Devices

Datasheet
Download LTC4282 Datasheet




 LTC4282
LTC4282
High Current Hot Swap
Controller with I2C Compatible Monitoring
FEATURES
n Allows Safe Board Insertion Into Live Backplane
n 12-/16-Bit ADC with ±0.7% Total Unadjusted Error
n Monitors Current, Voltage, Power and Energy
n Controls Two Parallel N-Channel MOSFETs for SOA
Sharing in High Current Applications
n Internal EEPROM for Nonvolatile Configuration
n Wide Operating Voltage Range: 2.9V to 33V
n I2C/SMBus Digital Interface (Coexists with PMBus
Devices)
n 12V Gate Drive for Lower MOSFET RDS(ON)
n Programmable Current Limit with 2% Accuracy
n MOSFET Power Limiting with Current Foldback
n Continuously Monitors MOSFET Health
n Stores Minimum and Maximum Measurements
n Alerts When Alarm Thresholds Exceeded
n Input Overvoltage and Undervoltage Protection
n Internal ±5% or External Timebases
n 32-Pin 5mm × 5mm QFN Package
n AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
n Enterprise Servers and Data Storage Systems
n Network Routers and Switches
n Base Stations
n Platform Management
DESCRIPTION
The LTC®4282 hot swap controller allows a board to be
safely inserted and removed from a live backplane. Using
one or more external N-channel pass transistors, board
supply voltage and inrush current are ramped up at an
adjustable rate. An I2C interface and onboard ADC allows
for monitoring of board current, voltage, power, energy
and fault status.
The device features analog foldback current limiting and
supply monitoring for applications from 2.9V to 33V.
Dual 12V gate drive allows high power applications to
either share safe operating area across parallel MOSFETs
or support a 2-stage start-up that first charges the load
capacitance followed by enabling a low on-resistance path
to the load.
The LTC4282 is well suited to high power applications
because the precise monitoring capability and accurate
current limiting reduce the extremes in which both loads
and power supplies must safely operate. Non-volatile con-
figuration allows for flexibility in the autonomous genera-
tion of alerts and response to faults.
All registered trademarks and trademarks are the property of their respective owners. Patents
pending.
TYPICAL APPLICATION
12V, 100A Plug-In Board Application
0.25mΩ
VOUT
12V
0.25mΩ
10Ω
+
12V
100A
SDA
SCL
ALERT
12V
GND
BACKPLANE PLUG-IN
BOARD
SMCJ15CA
×2
1Ω 1Ω
1Ω 1Ω
10Ω
NC
NC
NC
100k
VDD SENSE2+ ADC+ SENSE1+ SENSE1ADCSENSE2GATE1 GATE2
UV
OV
SDAI
SDAO
SCL
ALERT
ADR0
ADR1
ADR2
ON
INTVCC
SOURCE
LTC4282
FB
GPIO1
TIMER
GPIO2
GPIO3
WP CLKIN CLKOUT GND
4282 TA01
4.7µF
10nF
NC
NC
POWER
GOOD
GP
GP
Document Feedback
For more information www.analog.com
Start-Up Waveforms
VDD
10V/DIV
CONTACT BOUNCE
∆VGATE
10V/DIV
VSOURCE
10V/DIV
GPIO1(PG)
10V/DIV
50ms DE-BOUNCE
20ms/DIV
4282 TA01b
Rev. B
1




 LTC4282
LTC4282
TABLE OF CONTENTS
Features...................................................... 1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 3
Order Information........................................... 3
Electrical Characteristics.................................. 3
Pin Configuration........................................... 3
Electrical Characteristics.................................. 4
Timing Diagram............................................. 6
Typical Performance Characteristics.................... 7
Pin Functions................................................ 9
Functional Diagram....................................... 11
Operation................................................... 12
Applications Information................................. 13
Turn-On Sequence .................................................. 13
Turn-Off Sequence................................................... 14
Current Limit Adjustment......................................... 15
Constant Current Start-Up Using GATE R-C
Networks................................................................. 15
Current Limit Stability.............................................. 15
Parasitic MOSFET Oscillations................................. 15
Overcurrent Fault..................................................... 16
Advantages of Dual Gate Drivers............................. 16
Overvoltage Fault..................................................... 17
Undervoltage Fault...................................................20
ON/OFF Control........................................................20
FET Bad Fault........................................................... 21
FET Short Fault........................................................22
Power Bad Fault.......................................................22
Fault Alerts..............................................................22
Resetting Faults in FAULT_LOG...............................23
Reboot..................................................................... 23
Data Converters.......................................................23
CLKIN, CLKOUT: Crystal Oscillator/External Clock...25
Configuring the GPIO Pins.......................................25
Supply Transients....................................................26
Design Example.......................................................26
Layout Considerations............................................. 28
Digital Interface.......................................................29
START and STOP Conditions...................................29
I2C Device Addressing.............................................29
Acknowledge........................................................... 29
Write Protocol.........................................................29
Read Protocol..........................................................29
Data Synchronization............................................... 31
Alert Response Protocol.......................................... 31
EEPROM.................................................................. 31
Register Set................................................ 33
Detailed I2C Command Register Descriptions........ 34
Typical Applications....................................... 46
Package Description...................................... 48
Revision History........................................... 49
Typical Application........................................ 50
Related Parts............................................... 50
Rev. B
2
For more information www.analog.com




 LTC4282
LTC4282
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage VDD..................................... –0.3V to 45V
Input Voltages
GATEn – SOURCE (Note 3)..................... –0.3V to 10V
SENSEn+, ADC+,
SENSE1.............................. VDD – 4.5V to VDD + 0.3V
SENSE2, ADC........................... –0.3V to VDD + 0.3V
SOURCE.................................................. –0.3V to 45V
ADR0-2, TIMER......................–0.3V to INTVCC + 0.3V
CLKIN.................................................... –0.3V to 5.5V
UV, OV, FB, WP, ON, GPIO1-3,
SCL, SDAI............................................... –0.3V to 45V
Output Voltages
INTVCC................................................... –0.3V to 5.5V
GATE1,2, GPIO1-3, ALERT, SDAO............ –0.3V to 45V
CLKOUT..................................–0.3V to INTVCC + 0.3V
Output Current INTVCC (VDD > 4V).........................25mA
Operating Ambient Temperature Range
LTC4282C................................................. 0°C to 70°C
LTC4282I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
ON 1
24 GATE2
OV 2
23 GATE1
GND 3
WP 4
INTVCC 5
TIMER 6
CLKOUT 7
22 SOURCE
21 FB
33
20 GND
19 GPIO1
18 GPIO2
CLKIN 8
17 GPIO3
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 44°C/W
EXPOSED PAD (PIN 33) PCB GND
ELECTRICAL CONNECTION OPTIONAL
ORDER INFORMATION
TUBE
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4282CUH#PBF
LTC4282CUH#TRPBF 4282
32-Lead (5mm × 5mm) Plastic QFN
0°C to 70°C
LTC4282IUH#PBF
LTC4282IUH#TRPBF
4282
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
AUTOMOTIVE PRODUCTS**
LTC4282IUH#WPBF
LTC4282IUH#WTRPBF 4282
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDD = 12V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Supplies
VDD
IDD
VDD(UVL)
VDD(HYST)
Input Supply Range
Input Supply Current
Input Supply Undervoltage Lockout
Input Supply Undervoltage Lockout Hysteresis
VDD Rising
l 2.9
33
l
3.5
8
l 2.65 2.7 2.75
l 15
40
75
UNITS
V
mA
V
mV
Rev. B
For more information www.analog.com
3



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