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Linear Technology Electronic Components Datasheet

LTC4222IG Datasheet

Dual Hot Swap Controller

No Preview Available !

FEATURES
n Allows Safe Insertion Into a Live Backplane
n 10-Bit ADC Monitors Currents and Voltages
n I2C/SMBus Interface
n Wide Operating Voltage Range: 2.9V to 29V
n dI/dt Controlled Soft-Start
n High Side Drive for External N-Channel MOSFETs
n No External Gate Capacitors Required
n Input Overvoltage/Undervoltage Protection
n Optional Latchoff or Auto-Retry After Faults
n Alert Host After Faults
n Inrush Current Limit with Foldback
n Available in 32-Pin (5mm × 5mm) QFN
and 36-Pin SSOP Packages
APPLICATIONS
n Live Board Insertion
n Electronic Circuit Breakers
n Computers, Servers
n Platform Management
LTC4222
Dual Hot Swap Controller
with I2C Compatible
Monitoring
DESCRIPTION
The LTC®4222 Hot Swap™ controller allows two power
paths to be safely inserted and removed from a live back-
plane. Using external N-channel pass transistors, board
supply voltages and inrush currents are ramped up at an
adjustable rate. An I2C interface and onboard ADC allows
for monitoring of current, voltage and fault status for
each channel.
The device features adjustable, analog, foldback current
limit circuits and a soft-start circuit that sets the dI/dt of
the inrush currents. An I2C interface may configure the
part to latch off or automatically restart after the LTC4222
detects a fault on either channel.
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
good, detect insertion of a load card and power-up either
automatically upon insertion or wait for an I2C command
to turn on.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners. Protected by U.S. Patents including 7330065.
TYPICAL APPLICATION
Advanced Mezzanine Card Application
6mΩ Si7336ADP
12V
12V
7.4A
34k
10.2k
0.1µF
1.02k
3.4k
ON
SDA
SCL
ALERT
NC
0.1µF
3.3V
0.1µF
3.4k
1.02k
6.55k
10Ω
UV1 VDD1
OV1
ON
SDA
SCL
ALERT
CONFIG
ADR0
ADR1
ADR2
INTVCC
GND
OV2
UV2 VDD2
SENSE1GATE1 SOURCE1
FB1
GPIO1
EN1
ADIN1
TIMER
LTC4222
SS
ADIN2
EN2
GPIO2
FB2
SENSE2GATE2 SOURCE2
10Ω 10nF
300mΩ Si1046R
3.57k 10k
12PGOOD
1µF
68nF
AUXPGOOD
3.57k 10k
4.99k
4222 TA01a
BACKPLANE PLUG-IN
CARD
3.3V
150mA
Start-Up Waveform with Sequencing
VIN1/2
10V/DIV
VOUT2
10V/DIV
CONTACT
BOUNCE
VOUT1
10V/DIV
GPIO
PGOOD
10V/DIV
50ms/DIV
4222 TA01b
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Linear Technology Electronic Components Datasheet

LTC4222IG Datasheet

Dual Hot Swap Controller

No Preview Available !

LTC4222
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltages (VDDn)............................... –0.3V to 35V
Supply Voltage (INTVCC)............................ –0.3V to 6.5V
Input Voltages
GATEn – SOURCEn (Note 3)..................... –0.3V to 5V
SENSE+n...........................VDDn – 6.5V to VDDn + 0.3V
SENSEn..............................–0.3V to SENSE+n + 0.3V
SOURCEn................................................... –5V to 35V
UVn......................................–0.3V to SENSE+n + 0.3V
ENn, FBn, ON, OVn................................. –0.3V to 12V
ADR0-2, TIMER, SS................ –0.3V to INTVCC + 0.3V
ADINn, CONFIG....................................... –0.3V to 12V
ALERT, SCL, SDA, SDAI, SDAO............. –0.3V to 6.5V
Output Voltages
GATEn, GPIOn......................................... –0.3V to 35V
Operating Temperature Range
LTC4222C................................................. 0°C to 70°C
LTC4222I.............................................. –40°C to 85°C
Storage Temperature Range.................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
SSOP................................................................. 300°C
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
SS 1
24 EN1
CONFIG 2
23 ADIN1
INTVCC 3
GND 4
ADR0 5
22 ON
21 ALERT
33
20 SCL
ADR1 6
19 SDA
ADR2 7
18 ADIN2
TIMER 8
17 EN2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33), PCB GND CONNECTION OPTIONAL
SENSE11
SENSE1+ 2
VDD1 3
UV1 4
OV1 5
SS 6
CONFIG 7
INTVCC 8
GND 9
ADR0 10
ADR1 11
ADR2 12
TIMER 13
OV2 14
UV2 15
VDD2 16
SENSE2+ 17
SENSE218
TOP VIEW
36 GATE1
25 SOURCE1
34 FB1
33 GPIO1
32 EN1
31 ADIN1
30 ON1
29 ON2
28 ALERT
27 SCL
26 SDAI
25 SDAO
24 ADIN2
23 EN2
22 GPIO2
21 FB2
20 SOURCE2
19 GATE2
G PACKAGE
36-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4222CG#PBF
LTC4222CG#TRPBF
LTC4222CG
36-Lead Plastic SSOP
0°C to 70°C
LTC4222IG#PBF
LTC4222IG#TRPBF
LTC4222IG
36-Lead Plastic SSOP
–40°C to 85°C
LTC4222CUH#PBF
LTC4222CUH#TRPBF
LTC4222
32-Lead (5mm × 5mm) Plastic QFN 0°C to 70°C
LTC4222IUH#PBF
LTC4222IUH#TRPBF
LTC4222
32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
4222fb
2


Part Number LTC4222IG
Description Dual Hot Swap Controller
Maker Linear
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LTC4222IG Datasheet PDF






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