LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
1
425212fe
For more information www.linear.com/LTC4252-1
Typical applicaTion
FeaTures
DescripTion
Negative Voltage
Hot Swap Controllers
The LTC
?/DIV>
4252 negative voltage Hot Swap
TM
controller
allows a board to be safely inserted and removed from a
live backplane. Output current is controlled by three stages
of current limiting: a timed circuit breaker, active current
limiting and a fast feedforward path that limits peak current
under worst-case catastrophic fault conditions.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4252s supply input is
shunt regulated, allowing safe operation with very high
supply voltages. A multifunction timer delays initial start-
up and controls the circuit breakers response time. The
circuit breakers response time is accelerated by sensing
excessive MOSFET drain voltage, keeping the MOSFET
within its safe operating area (SOA). An adjustable soft-
start circuit controls MOSFET inrush current at start-up.
The LTC4252-1/LTC4252A-1 latch off after a circuit breaker
fault times out. The LTC4252-2/LTC4252A-2 provide au-
tomatic retry after a fault. The LTC4252A-1/LTC4252A-2
feature tight ?% undervoltage/overvoltage threshold
accuracy. The LTC4252 is available in either an 8-pin
or 10-pin MSOP , while the LTC4252A is available in the
10-pin MSOP .
48V/2.5A Hot Swap Controller
Start-Up Behavior
applicaTions
n
Allows Safe Board Insertion and Removal from a
Live 48V Backplane
n
Floating Topology Permits Very High Voltage Operation
n
Current Limit With Circuit Breaker Timer
n
Fast Response Time Limits Peak Fault Current
n
Programmable Soft-Start Current Limit
n
Programmable Timer with Drain Voltage
Accelerated Response
n
?/SPAN>1% Undervoltage/Overvoltage Threshold Accuracy
(LTC4252A)
?/DIV>
Adjustable Undervoltage/Overvoltage Protection
?/DIV>
LTC4252-1/LTC4252A-1: Latch Off After Fault
?/DIV>
LTC4252-2/LTC4252A-2: Automatic Retry After Fault
?/DIV>
Available in 8-Pin and 10-Pin MSOP Packages
n
Hot Board Insertion
n
Electronic Circuit Breaker
n
48V Distributed Power Systems
n
Negative Power Supply Control
n
Central Office Switching
n
High Availability Servers
n
ATCA
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.
425212 TA01
48RTN
OV
UV
V
EE
V
IN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252-1
R1
402k
1%
R2
32.4k
1%
C
T
0.33礔
D
IN
DDZ13B
**
C
SS
68nF
C
C
18nF
48V
R
S
0.02
Q1
IRF530S
V
OUT
R
C
10
R3
5.1k
R
IN
3?1.8k IN SERIES
1/4W EACH
C1
10nF
C
IN
1礔
C
L
100礔
48RTN
(SHORT PIN)
+
R
D
1M
LOAD
EN
*
* M0C207
**DIODES, INC
RECOMMENDED FOR HARSH ENVIRONMENTS
425212 TA01a
GATE
5V/DIV
SENSE
2.5A/DIV
PWRGD
10V/DIV
1ms/DIV
V
OUT
20V/DIV
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