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Linear Technology Electronic Components Datasheet

LTC4261IGN Datasheet

Negative Voltage Hot Swap Controllers

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LTC4261/LTC4261-2
Negative Voltage
Hot Swap Controllers with
ADC and I2C Monitoring
FEATURES
DESCRIPTION
n Allows Safe Insertion into Live –48V Backplanes
n 10-Bit ADC Monitors Current and Voltages
n I2C/SMBus Interface or Single-Wire Broadcast Mode
n Floating Topology Allows Very High Voltage
Operation
n Independently Adjustable Inrush and Overcurrent
Limits
n Controlled Soft-Start Inrush
n Adjustable UV/OV Thresholds and Hysteresis
n Sequenced Power Good Outputs with Delays
n Adjustable Power Good Input Timeout
n Programmable Latchoff or Auto-Retry After Faults
n Alerts Host After Faults
n Available in 28-Lead Narrow SSOP and 24-Lead
(4mm × 5mm) QFN Packages
APPLICATIONS
n AdvancedTCA Systems
n Telecom Infrastructure
n –48V Distributed Power Systems
n Power Monitors
The LTC®4261/LTC4261-2 negative voltage Hot SwapTM
controllers allow a board to be safely inserted and removed
from a live backplane. Using an external N-channel pass
transistor, the board supply voltage can be ramped at an
adjustable rate. The devices feature independently adjust-
able inrush current and overcurrent limits to minimize
stresses on the pass transistor during start-up, input
step and output short conditions. The LTC4261 defaults
to latch-off while the LTC4261-2 defaults to auto-retry on
overcurrent faults.
An I2C interface and onboard 10-bit ADC allow monitoring
of board current, voltage and fault status. A single-wire
broadcast mode is available to simplify the interface by
eliminating two optoisolators.
The controllers have additional features to interrupt the
host when a fault has occurred, notify when output power
is good, detect insertion of a board and turn off the pass
transistor if an external supply monitor fails to indicate
power good within a timeout period.
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 7382167, 8194379, 8230151.
TYPICAL APPLICATION
–48V/200W Hot Swap Controller with I2C and ADC
–48V RTN
453k
1%
4 × 1k IN SERIES
1/4W EACH
UV = 38.5V
UV RELEASE
AT 43V
OV = 72.3V
OV RELEASE
AT 71V
16.9k
1%
11.8k
1%
1µF
–48V INPUT
UVL
UVH
ADIN2
OV
INTVCC
ON
SS
VIN
PGI
ALERT
SDAO
LTC4261CGN
SDAI
SCL
ADIN
PGIO
TMR EN VEE SENSE GATE DRAIN RAMP PG
220nF
47nF
10Ω
1M 1k
VIN+ +
LOAD
ON
VIN–
0.1µF 47nF
0.008Ω
1%
10nF
100V
5% VOUT
Q1
IRF1310NS
42612 TA01
–48V INPUT
50V/DIV
330µF
100V
VOUT
50V/DIV
SENSE
0.5A/DIV
PG
50V/DIV
For more information www.linear.com/LTC4261
Start-Up Behavior
10ms/DIV
42612 TA01b
42612fd
1


Linear Technology Electronic Components Datasheet

LTC4261IGN Datasheet

Negative Voltage Hot Swap Controllers

No Preview Available !

LTC4261/LTC4261-2
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
VIN (Note 3)........................................... –0.3V to 10.65V
Drain (Note 4)........................................... –0.3V to 3.5V
PGI, ON, ALERT, SDAO, SDAI, SCL, ADIN, ADIN2,
OV, SENSE, ADR1, ADR0, FLTIN, TMR,
SS, RAMP Voltages....................–0.3V to INTVCC + 0.3V
UVL, UVH, EN............................................. –0.3V to 10V
GATE Voltage................................... –0.3V to VIN + 0.3V
PG, PGIO Voltages..................................... –0.3V to 80V
Supply Voltage (INTVCC)........................... –0.3V to 5.5V
Operating Ambient Temperature Range
LTC4261C................................................. 0°C to 70°C
LTC4261I..............................................–40°C to 85°C
Storage Temperature Range
SSOP.................................................. –65°C to 150°C
QFN..................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP Only......................................................... 300°C
PIN CONFIGURATION
TOP VIEW
PGI 1
ON 2
ALERT 3
SDAO 4
SDAI 5
SCL 6
INTVCC 7
UVL 8
UVH 9
ADIN2 10
OV 11
NC 12
VEE 13
SENSE 14
28 PGIO
27 PG
26 EN
25 ADR1
24 ADR0
23 ADIN
22 FLTIN
21 VIN
20 TMR
19 SS
18 RAMP
17 NC
16 DRAIN
15 GATE
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 85°C/W
TOP VIEW
SDAO 1
SDAI 2
SCL 3
INTVCC 4
UVL 5
UVH 6
OV 7
24 23 22 21 20
19 EN
18 ADR1
17 ADR0
25
16 ADIN
15 VIN
14 TMR
13 SS
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 45°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4261CGN#PBF
LTC4261CGN#TRPBF
LTC4261CGN
28-Lead Plastic SSOP
0°C to 70°C
LTC4261IGN#PBF
LTC4261IGN#TRPBF
LTC4261IGN
28-Lead Plastic SSOP
–40°C to 85°C
LTC4261CGN-2#PBF
LTC4261CGN-2#TRPBF LTC4261IGN-2
28-Lead Plastic SSOP
0°C to 70°C
LTC4261IGN-2#PBF
LTC4261IGN-2#TRPBF LTC4261IGN-2
28-Lead Plastic SSOP
–40°C to 85°C
LTC4261CUFD#PBF
LTC4261CUFD#TRPBF 4261
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4261IUFD#PBF
LTC4261IUFD#TRPBF 4261
24-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4261CUFD-2#PBF
LTC4261CUFD-2#TRPBF 42612
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4261IUFD-2#PBF
LTC4261IUFD-2#TRPBF 42612
24-Lead (4mm × 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/
42612fd
2
For more information www.linear.com/LTC4261


Part Number LTC4261IGN
Description Negative Voltage Hot Swap Controllers
Maker Linear
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LTC4261IGN Datasheet PDF






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