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LTC4252A-1CMS

Description
Negative Voltage Hot Swap Controllers
CategoryPower/power management    The power supply circuit   
File Size367KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC4252A-1CMS Overview

Negative Voltage Hot Swap Controllers

LTC4252A-1CMS Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeMSOP
package instructionTSSOP, TSSOP10,.19,20
Contacts10
Manufacturer packaging codeMS
Reach Compliance Codenot_compliant
ECCN codeEAR99
Adjustable thresholdYES
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeS-PDSO-G10
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of channels2
Number of functions1
Number of terminals10
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP10,.19,20
Package shapeSQUARE
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.1 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 levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
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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