LTC4253/LTC4253A
1
425353aff
For more information www.linear.com/4253
48V/2.5A Hot Swap Controller
Start-Up Behavior
TYPICAL APPLICATION
FEATURES
DESCRIPTION
48V Hot Swap Controllers
with Sequencer
The LTC
?/DIV>
4253/LTC4253A negative voltage Hot Swap"
controllers allow 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 condi-
tions. The LTC4253/LTC4253A latch off after a circuit fault.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4253/LTC4253As 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 can be 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.
Three power good outputs are sequenced by an adjustable
timer and two ENABLE inputs to enable external power
modules at start-up or disable them if the circuit breaker
trips. The LTC4253A features tight ?% undervoltage/
overvoltage threshold accuracy. The LTC4253/LTC4253A
are available in a 16-pin SSOP .
APPLICATIONS
n
Allows Safe Board Insertion and Removal from a
Live 48V Backplane
n
Floating Topology Permits Very High Voltage
Operation
n
Adjustable Analog Current Limit with Breaker Timer
Ideal for Two Battery Feeds
n
Fast Response Time Limits Peak Fault Current
n
Adjustable Undervoltage/Overvoltage Protection
with ?% Threshold Accuracy (LTC4253A)
n
Three Sequenced Power Good Outputs
n
Adjustable Soft-Start Current Limit
n
Adjustable Timer with Drain Voltage Accelerated
Response
n
Latchoff After Fault
n
Available in a 16-Pin SSOP Package
n
48V Distributed Power Systems
n
Negative Power Supply Control
n
Central Office Switching
n
High Availability Servers
n
Disk Arrays
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.
5.6k
5.6k
5.6k
PWRGD1
V
IN
EN2 EN3
V
IN
V
EE
LTC4253
LOAD1
PWRGD2
PWRGD3
OV
DRAIN
SS
GATE
SQTIMER
SENSE
TIMER
EN
LOAD2
EN
LOAD3
EN
2.5k
15k(1/4W)/6
UV
RESET
4253 TA01
10
1M
0.02
IRF530S
*DIODES, INC.
MOC207
RECOMMENDED FOR HARSH ENVIRONMENTS.
18nF
0.33礔
0.1礔
68nF
10nF
+
100礔
B3100*
402k
1%
48V A
48V B
48V RTN
48V RTN
B3100*
32.4k
1%
1礔
D
IN
DDZ13B*
GATE
10V
SS
1V
SENSE
50mV
V
OUT
50V
1ms/DIV
4253 TA01b
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