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LTC4252-1IMS8 Datasheet

  • LTC4252-1IMS8

  • Negative Voltage Hot Swap Controllers

  • 32頁

  • LINER

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LTC4252-1/LTC4252-2
Negative Voltage
Hot Swap Controllers
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Allows Safe Board Insertion and Removal from a
Live 鈥?48V Backplane
Floating Topology Permits Very High Voltage
Operation
Programmable Analog Current Limit With Circuit
Breaker Timer
Fast Response Time Limits Peak Fault Current
Programmable Soft-Start Current Limit
Programmable Timer with Drain Voltage
Accelerated Response
Programmable Undervoltage/Overvoltage Protection
LTC4252-1: Latch Off After Fault
LTC4252-2: Automatic Retry After Fault
The LTC
廬
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.
Programmable undervoltage and overvoltage detectors
disconnect the load whenever the input supply exceeds
the desired operating range. The LTC4252鈥檚 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鈥檚 response time. The
circuit breaker鈥檚 response time is accelerated by sensing
excessive MOSFET drain voltage, keeping the MOSFET
within its safe operating area (SOA). A programmable
soft-start circuit controls MOSFET inrush current at start-
up. A power good status output can enable a power
module at start-up or disable it if the circuit breaker trips.
The LTC4252-1 latches off after a circuit breaker fault times
out. The LTC4252-2 provides automatic retry after a fault.
The LTC4252 is available in either an 8-pin or 10-pin MSOP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
Hot Board Insertion
Electronic Circuit Breaker
鈥?48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
Programmable Current Limiting Circuit
High Availability Servers
Disk Arrays
TYPICAL APPLICATIO
GND
鈥?48V/2.5A Hot Swap Controller
R
IN
3脳 1.8k IN SERIES
1/4W EACH
C
IN
1碌F
+
C
L
100碌F
LOAD
EN
GATE
5V/DIV
GND
(SHORT PIN)
1
R1
402k
1%
V
IN
LTC4252-1
8
9
R2
32.4k
1%
C1
10nF
10
OV
UV
TIMER
V
EE
5
PWRGD
DRAIN
GATE
SENSE
2
7
6
4
R3
5.1k
*
R
D
1M
V
OUT
SENSE
2.5A/DIV
3
C
T
SS
0.33碌F
C
SS
68nF
Q1
IRF530S
R
C
10鈩?/div>
C
C
18nF
R
S
0.02鈩?/div>
V
OUT
20V/DIV
鈥?8V
* M0C207
4252-1/2 TA01
PWRGD
10V/DIV
1ms/DIV
4252-1/2 TA01a
U
Start-Up Behavior
425212f
U
U
1

LTC4252-1IMS8 產(chǎn)品屬性

  • 50

  • 集成電路 (IC)

  • PMIC - 熱交換

  • -

  • 熱交換控制器

  • 通用

  • 無

  • -

  • -

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-TSSOP, 8-MSOP (0.118", 3.00mm 寬)

  • 8-MSOP

  • 管件

  • LTC42521IMS8

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