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LTC4252-2CMS8PBF

Description
Negative Voltage Hot Swap Controllers
File Size367KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4252-2CMS8PBF Overview

Negative Voltage Hot Swap Controllers

LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
Negative Voltage
Hot Swap Controllers
FEATURES
DESCRIPTIO
Allows Safe Board Insertion and Removal from a
Live – 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
±1%
Undervoltage/Overvoltage Threshold Accuracy
(LTC4252A)
Adjustable Undervoltage/Overvoltage Protection
LTC4252-1/LTC4252A-1: Latch Off After Fault
LTC4252-2: Automatic Retry After Fault
Available in 8-Pin and 10-Pin MSOP Packages
The LTC
®
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 LTC4252’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 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 provides automatic retry
after a fault. The LTC4252A-1/LTC4252A-2 feature tight
±1%
undervoltage/overvoltage threshold accuracy. The
LTC4252 is available in either an 8-pin or 10-pin MSOP.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
Hot Board Insertion
Electronic Circuit Breaker
– 48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
High Availability Servers
ATCA
TYPICAL APPLICATIO
GND
– 48V/2.5A Hot Swap Controller
R
IN
3× 1.8k IN SERIES
1/4W EACH
C
IN
1µF
R1
402k
1%
V
IN
LTC4252-1
OV
UV
R2
32.4k
1%
C1
10nF
TIMER
C
T
0.33µF
SS
C
SS
68nF
V
EE
PWRGD
DRAIN
GATE
SENSE
R
C
10Ω
C
C
18nF
R
S
0.02Ω
PWRGD
10V/DIV
4252-1/2 TA01
+
C
L
100µF
LOAD
EN
GATE
5V/DIV
GND
(SHORT PIN)
R3
5.1k
*
R
D
1M
V
OUT
SENSE
2.5A/DIV
Q1
IRF530S
V
OUT
20V/DIV
–48V
* M0C207
U
Start-Up Behavior
1ms/DIV
4252-1/2 TA01a
U
U
425212fb
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