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參數(shù)資料
| 型號： | LTC4253IGN#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 1/34頁 |
| 文件大小： | 369K |
| 代理商： | LTC4253IGN#TRPBF |
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LTC4253/LTC4253A
1
425353afd
–48V/2.5A Hot Swap Controller
Start-Up Behavior
Typical applicaTion
FeaTures
DescripTion
–48V Hot Swap Controllers
with Sequencer
The LTC4253/LTC4253A negative voltage Hot Swap
controllersallowaboardtobesafelyinsertedandremoved
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/LTC4253A’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
MOSFETwithinitssafeoperatingarea(SOA).Anadjustable
soft-startcircuitcontrolsMOSFETinrushcurrentatstart-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 ±1% 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 ±1% 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
PWRGD1
VIN
EN2 EN3
VIN
VEE
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
0.33F
0.1F
68nF
10nF
+
100F
B3100*
402k
1%
–48V A
–48V B
–48V RTN
B3100*
32.4k
1%
1F
DIN
DDZ13B*
GATE
10V
SS
1V
SENSE
50mV
VOUT
50V
1ms/DIV
4253 TA01b
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