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LTC4261/LTC4261-2
1
42612fc
Negative Voltage
Hot Swap Controllers with
ADC and I
2
C Monitoring
The LTC
?/DIV>
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 LTC4261 defaults
to latch-off while the LTC4261-2 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
RAMP
DRAIN
GATE
LTC4261CGN
V
IN
V
EE
EN
TMR
SS
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%
47nF
0.1礔
1礔
220nF
47nF
0.008
1%
10
V
OUT
Q1
IRF1310NS
1k
330礔
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.
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