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LTC4251B-1_15

Description
Negative Voltage Hot Swap Controllers in SOT-23
File Size209KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4251B-1_15 Overview

Negative Voltage Hot Swap Controllers in SOT-23

LTC4251B/LTC4251B-1/
LTC4251B-2
Negative Voltage
Hot Swap Controllers in SOT-23
FEATURES
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DESCRIPTION
The LTC
®
4251B/LTC4251B-1/LTC4251B-2 negative voltage
Hot Swap™ controllers allow a board to be safely inserted
and removed from a live backplane. Output current is con-
trolled 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 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 LTC4251B UV/OV thresholds are designed to match
the standard telecom operating range of – 43V to –75V. The
LTC4251B-1 UV/OV thresholds extend the operating range
to encompass –36V to –72V. The LTC4251B-2 implements
a UV threshold of –43V only. The LTC4251B improves the
ruggedness of the LTC4251 shunt regulator.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
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
Improved Ruggedness Shunt Regulator
Programmable Timer
Programmable Undervoltage/Overvoltage Protection
Low Profile 6-Lead SOT-23 (ThinSOT™) Package
APPLICATIONS
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Hot Board Insertion
Electronic Circuit Breaker
–48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
Programmable Current Limiting Circuit
High Availability Servers
Disk Arrays
TYPICAL APPLICATION
–48V, 2.5A Hot Swap Controller
–48RTN
–48RTN
(SHORT PIN)
R1
402k
1%
C1
10nF
R2
32.4k
1%
R
IN
*
10k
500mW
D
IN†
DDZ13B**
V
IN
UV/OV
GATE
3
R
C
10Ω
C
C
18nF
4
*TWO 0.25W RESISTORS IN SERIES FOR
R
IN
ON THE PCB ARE RECOMMENDED.
**DIODES, INC.
†RECOMMENDED FOR HARSH ENVIRONMENTS
4251b12f
Start-Up Behavior
+
LOAD
V
OUT
Q1
IRF530S
SENSE
2.5A/DIV
C
L
100μF
C
IN
1μF
GATE
5V/DIV
LTC4251B
TIMER SENSE
V
EE
C
T
150nF
1
R
S
0.02Ω
2
4251b12 TA01a
V
OUT
20V/DIV
–48V
1ms/DIV
4251b12 TA01b
1

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LTC4251B-1_15 LTC4251B-2_15 LTC4251B_15
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