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LTC4251-2IS6#TRM

Description
IC ctrlr hotswp neg volt sot23-6
CategoryPower/power management    The power supply circuit   
File Size266KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC4251-2IS6#TRM Overview

IC ctrlr hotswp neg volt sot23-6

LTC4251-2IS6#TRM Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSOT
package instructionVSSOP, TSOP6,.11,37
Contacts6
Manufacturer packaging codeS6
Reach Compliance Codenot_compliant
ECCN codeEAR99
Adjustable thresholdYES
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PDSO-G6
JESD-609 codee0
length2.9 mm
Humidity sensitivity level1
Number of channels1
Number of functions1
Number of terminals6
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeVSSOP
Encapsulate equivalent codeTSOP6,.11,37
Package shapeRECTANGULAR
Package formSMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1 mm
Maximum supply current (Isup)2 mA
Maximum supply voltage (Vsup)14.5 V
Minimum supply voltage (Vsup)11.5 V
Nominal supply voltage (Vsup)13 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.95 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width1.625 mm
LTC4251/LTC4251-1/
LTC4251-2
Negative Voltage
Hot Swap Controllers in SOT-23
FEATURES
n
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DESCRIPTION
The
LTC
®
4251/LTC4251-1/LTC4251-2
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 LTC4251 UV/OV thresholds are designed to match the
standard telecom operating range of – 43V to –75V. The
LTC4251-1 UV/OV thresholds extend the operating range
to encompass –36V to –72V. The LTC4251-2 implements
a UV threshold of –43V only.
All parts are available in the 6-Pin SOT-23 package.
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.
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n
n
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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 Timer
Programmable Undervoltage/Overvoltage Protection
Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
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n
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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%
–48V
*TWO 0.25W RESISTORS IN SERIES FOR
R
IN
ON THE PCB ARE RECOMMENDED.
**DIODES, INC.
†RECOMMENDED FOR HARSH ENVIRONMENTS
R
IN
*
10k
500mW
D
IN†
DDZ13B**
V
IN
UV/OV
GATE
3
R
C
10
C
C
18nF
LTC4251
TIMER SENSE
V
EE
C
T
150nF
1
R
S
0.02
2
425112 TA01
Start-Up Behavior
C
L
100µF
C
IN
1µF
+
LOAD
V
OUT
Q1
IRF530S
GATE
5V/DIV
SENSE
2.5A/DIV
V
OUT
20V/DIV
4
1ms/DIV
425112 TA02
425112fd
For more information
www.linear.com/4251
1
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