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LTC4261CGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LTC4261/LTC4261-2
1
42612fd
For more information www.linear.com/LTC4261
Negative Voltage
Hot Swap Controllers with
ADC and I
2
C Monitoring
The LT C
®
4261/LTC4261-2 negative voltage Hot Swap
TM
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 L
TC4261 defaults
to latch-off while the L
TC4261-2 defaults to auto-retry on
overcurrent faults.
An I
2
C 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.
n
AdvancedTCA Systems
n
Telecom Infrastructure
n
–48V Distributed Power Systems
n
Power Monitors
n
Allows Safe Insertion into Live –48V Backplanes
n
10-Bit ADC Monitors Current and Voltages
n
I
2
C/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
–48V/200W Hot Swap Controller with I
2
C and ADC
+
PGI
ALERT
SDAO
SDAI
SCL
ADIN
PGIO
PG
UVL
UVH
ADIN2
OV
INTV
CC
ON
RAMPDRAINGATE
LTC4261CGN
V
IN
V
EE
ENTMRSS SENSE
1M
4 × 1k IN SERIES
1/4W EACH
453k
1%
–48V RTN
–48V INPUT
UV = 38.5V
UV RELEASE
AT 43V
OV RELEASE
AT 71V
OV = 72.3V
16.9k
1%
11.8k
1%
10nF
100V
5%
47nF0.1µF
1µF
220nF
47nF
0.008Ω
1%
10Ω
V
OUT
Q1
IRF1310NS
1k
330µF
100V
LOAD
ON
42612 TA01
V
IN
+
V
IN
–
Start-Up Behavior
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
–48V INPUT
50V/DIV
V
OUT
50V/DIV
SENSE
0.5A/DIV
PG
50V/DIV
10ms/DIV
42612 TA01b
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.
LTC4261/LTC4261-2
2
42612fd
For more information www.linear.com/LTC4261
V
IN
(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 INTV
CC
+ 0.3V
UVL, UVH, EN ............................................ –0.3V to 10V
GATE Voltage .................................. –0.3V to V
IN
+ 0.3V
PG, PGIO Voltages .................................... –0.3V to 80V
Supply Voltage (INTV
CC
) .......................... –0.3V to 5.5V
(Notes 1, 2)
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
ABSOLUTE MAXIMUM RATINGS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PGI
ON
ALERT
SDAO
SDAI
SCL
INTV
CC
UVL
UVH
ADIN2
OV
NC
V
EE
SENSE
PGIO
PG
EN
ADR1
ADR0
ADIN
FLTIN
V
IN
TMR
SS
RAMP
NC
DRAIN
GATE
T
JMAX
= 125°C, θ
JA
= 85°C/W
8 9
TOP VIEW
25
UFD PACKAGE
24-LEAD (4mm
×
5mm) PLASTIC QFN
10 11 12
24 23 22 21 20
6
5
4
3
2
1
SDAO
SDAI
SCL
INTV
CC
UVL
UVH
OV
EN
ADR1
ADR0
ADIN
V
IN
TMR
SS
ALERT
ON
PGI
PGIO
PG
V
EE
SENSE
GATE
DRAIN
RAMP
7
14
15
16
17
18
19
13
T
JMAX
= 125°C, θ
JA
= 45°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
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/
LTC4261/LTC4261-2
3
42612fd
For more information www.linear.com/LTC4261
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at I
IN
= 5mA, T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
General
V
Z
Shunt Regulator Voltage at V
IN
I
IN
= 5mA
l
10.65 11.2 11.8 V
DV
Z
Shunt Regulator Load Regulation I
IN
= 5mA to 25mA
l
370 600 mV
I
IN
V
IN
Supply Current V
IN
= V
Z
– 0.3V
l
2 5 mA
V
IN(UVLO)
V
IN
Undervoltage Lockout Threshold V
IN
Rising
l
8.5 9 9.5 V
DV
IN(UVLO)
V
IN
Undervoltage Lockout Hysteresis
l
0.3 0.7 1 V
INTV
CC
Internal Regulator Voltage I
LOAD
= 1mA to 20mA, I
IN
= 25mA
l
4.75 5 5.25 V
Gate Drive
V
GATEH
GATE Pin Output High Voltage V
IN
= 10.65V
l
10 10.25 10.5 V
I
GATE(UP)
GATE Pin Pull-Up Current V
GATE
= 4V
l
–7.5 –11.5 –15.5 µA
I
GATE(OFF)
GATE Turn-Off Current V
SENSE
= 400mV, V
GATE
= 4V
l
45 90 120 mA
Gate Off, V
GATE
= 4V
l
60 110 140 mA
t
PHL(SENSE)
SENSE High to Current Limit V
SENSE
= 100mV, GATE Open
l
0.5 1.5 µs
Propagation Delay
V
SENSE
= 300mV, GATE Open
l
0.2 0.5 µs
t
PHL(GATE)
GATE Off Propagation Delay Input High (OV, EN, PGI), Input Low (ON, UVL),
GATE Open
l
0.2 0.5 µs
t
PHLCB
Circuit Breaker Gate Off Delay V
GATE
< 2V, GATE Open
l
440 530 620 µs
I
RAMP
RAMP Pin Current V
SS
= 2.56V
l
–18 –20 –22 µA
V
SS
SS Pin Clamp Voltage
l
2.43 2.56 2.69 V
I
SS(UP)
SS Pin Pull-Up Current V
SS
= 0V
l
–7 –10 –13 µA
I
SS(DN)
SS Pin Pull-Down Current V
SS
= 2.56V
l
6 12 20 mA
Input Pins
V
UVH(TH)
UVH Threshold Voltage V
UVH
Rising LTC4261C
LTC4261I
l
l
2.534
2.522
2.56
2.56
2.586
2.598
V
V
UVL(TH)
UVL Threshold Voltage V
UVL
Falling LTC4261C
LTC4261I
l
l
2.263
2.254
2.291
2.291
2.319
2.328
V
DV
UV(HYST)
Built-In UV Hysteresis UVH and UVL Tied Together
l
256 269 282 mV
dV
UV
UVH, UVL Minimum Hysteresis 15 mV
V
UVLR(TH)
UVL Reset Threshold Voltage V
UVL
Falling
l
1.12 1.21 1.30 V
DV
UVLR(HYST)
UVL Reset Hysteresis 60 mV
V
OV(TH)
OV Pin Threshold Voltage V
OV
Rising LTC4261C
LTC4261I
l
l
1.744
1.735
1.770
1.770
1.796
1.805
V
DV
OV(HYST)
OV Pin Hysteresis
l
18 37.5 62 mV
DV
SENSE
Current Limit Sense Voltage Threshold V
SENSE
– V
EE
l
45 50 55 mV
V
INPUT(TH)
ON, EN, PGI, FLTIN Threshold Voltage ON, EN, PGI, FLTIN Falling or Rising
l
0.8 1.4 2 V
DV
INPUT(HYST)
ON, EN, PGI, FLTIN Hysteresis 170 mV
V
PGIO(TH)
PGIO Pin Input Threshold Voltage V
PGIO
Rising
l
1.10 1.25 1.40 V
DV
PGIO(HYST)
PGIO Pin Input Hysteresis 100 mV
I
INPUT
ON, EN, UVH, UVL, OV, SENSE, PGI,
FLTIN Input Current
ON, EN, UVH, UVL, OV, SENSE, PGI, FLTIN = 3V
l
0 ±2 µA
ELECTRICAL CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

LTC4261CGN#PBF

Mfr. #:
Buy LTC4261CGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Neg V Hot Swap Cntrs w/ ADC & I2C Mon in
Lifecycle:
New from this manufacturer.
Delivery:
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