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Linear Technology Electronic Components Datasheet

LTC4253B Datasheet

-48V Hot Swap Controller

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LTC4253B
–48V Hot Swap Controller
with Sequencer
Features
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 Three Sequenced Power Good Outputs
n Improved Ruggedness Shunt Regulator
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
Applications
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.
Description
The LTC®4253B negative voltage Hot Swap™ 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 cur-
rent under worst-case catastrophic fault conditions. The
LTC4253B latches off after a circuit fault.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4253B’s supply input is
shunt-regulated, allowing safe operation with very high
supply voltages. A multifunction timer delays initial start-up
and controls the circuit breaker’s response time. The circuit
breaker’s 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 LTC4253B improves the ruggedness of the
LTC4253 shunt regulator.
Typical Application
– 48V/2.5A Hot Swap Controller
– 48V RTN
– 48V RTN
402k
1%
2.5k
1µF 15k(1/4W)/6 VIN
10nF
DIN††
DDZ13B*
EN2 EN3 VIN
LTC4253B
RESET
5.6k
5.6k
32.4k
1%
– 48V A B3100*
B3100*
– 48V B
68nF
0.1µF
0.33µF
UV
OV
PWRGD1
PWRGD2
SS PWRGD3
SQTIMER
DRAIN
GATE
TIMER
SENSE
VEE
††
1M
IRF530S
10Ω
18nF
0.02Ω
+
100µF
5.6k
LOAD1
EN
LOAD2
EN
LOAD3
EN
4253b TA01
*DIODES, INC.
MOC207
††RECOMMENDED FOR HARSH ENVIRONMENTS.
GATE
10V
SS
1V
SENSE
50mV
VOUT
50V
Start-Up Behavior
1ms/DIV
4253b TA01b
4253bf
1


Linear Technology Electronic Components Datasheet

LTC4253B Datasheet

-48V Hot Swap Controller

No Preview Available !

LTC4253B
Absolute Maximum Ratings
(Note 1), All voltages referred to VEE
Current into VIN (100µs Pulse)..............................100mA
Current into DRAIN (100µs Pulse)..........................20mA
VIN, DRAIN Minimum Voltage.................................–0.3V
Input/Output (Except SENSE
and DRAIN) Voltage.................................... –0.3V to 16V
SENSE Voltage............................................ –0.6V to 16V
Current Out of SENSE (20µs Pulse)................... –200mA
Maximum Junction Temperature........................... 125°C
Operating Temperature Range
LTC4253BC............................................... 0°C to 70°C
LTC4253BI............................................–40°C to 85°C
Storage Temperature Range............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
EN2
PWRGD2
PWRGD1
VIN
RESET
SS
SENSE
VEE
1
2
3
4
5
6
7
8
16 PWRGD3
15 EN3
14 SQTIMER
13 TIMER
12 UV
11 OV
10 DRAIN
9 GATE
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4253BCGN#PBF
LTC4253BCGN#TRPBF 4253B
16-Lead Plastic SSOP
0°C to 70°C
LTC4253BIGN#PBF
LTC4253BIGN#TRPBF 4253B
16-Lead Plastic SSOP
–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/
4253bf
2


Part Number LTC4253B
Description -48V Hot Swap Controller
Maker Linear
Total Page 30 Pages
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