900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC4252B-1 Datasheet

Negative Voltage Hot Swap Controllers

No Preview Available !

LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
Negative Voltage
Hot Swap Controllers
FEATURES
DESCRIPTION
n Allows Safe Board Insertion and Removal from a
Live – 48V Backplane
n Floating Topology Permits Very High Voltage Operation
n Current Limit With Circuit Breaker Timer
n Fast Response Time Limits Peak Fault Current
n Programmable Soft-Start Current Limit
n Programmable Timer with Drain Voltage
Accelerated Response
n ±1% Undervoltage/Overvoltage Threshold (LTC4252C)
n Improved Ruggedness Shunt Regulator
Adjustable Undervoltage/Overvoltage Protection
LTC4252B-1/LTC4252C-1: Latch Off After Fault
LTC4252B-2/LTC4252C-2: Automatic Retry After Fault
Available in 8-Pin and 10-Pin MSOP Packages
APPLICATIONS
n Hot Board Insertion
n Electronic Circuit Breaker
n – 48V Distributed Power Systems
n Negative Power Supply Control
n Central Office Switching
n High Availability Servers
n ATCA
The LTC®4252 negative voltage Hot SwapTM 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 LTC4252-2 provides automatic retry after a fault. The
LTC4252C-1/LTC4252C-2 feature tight ±1% undervoltage/
overvoltage threshold accuracy. The LTC4252 is available
in either an 8-pin or 10-pin MSOP.
The LTC4252B and LTC4252C improve the ruggedness
of the shunt regulator in the LTC4252 and LTC4252A.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
–48V/2.5A Hot Swap Controller
–48RTN
–48RTN
(SHORT PIN) R1
402k
1%
R2
32.4k
1%
C1
10nF
DDIDNZ13B**
CT
0.33µF
RIN
3× 1.8k IN SERIES
1/4W EACH
+ CL
100µF
VIN
LTC4252B-1
OV PWRGD
UV DRAIN
TIMER
GATE
SS VEE SENSE
CSS
68nF
CIN R3
1µF 5.1k
*
LOAD
EN
VOUT
RD 1M
Q1
IRF530S
RC
10Ω
CC
18nF
RS
0.02Ω
– 48V
* M0C207
**DIODES, INC
RECOMMENDED FOR HARSH ENVIRONMENTS
4252B12 TA01
GATE
5V/DIV
SENSE
2.5A/DIV
VOUT
20V/DIV
PWRGD
10V/DIV
Start-Up Behavior
1ms/DIV
4252B12 TA01a
4252b12f
1


Linear Technology Electronic Components Datasheet

LTC4252B-1 Datasheet

Negative Voltage Hot Swap Controllers

No Preview Available !

LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
ABSOLUTE MAXIMUM RATINGS
All Voltages Referred to VEE (Note 1)
Current into VIN (100µs Pulse)..............................100mA
VIN, DRAIN Pin Minimum Voltage......................... – 0.3V
Input/Output Pins
(Except SENSE and DRAIN) Voltage........... –0.3V to 16V
SENSE Pin Voltage..................................... –0.6V to 16V
Current Out of SENSE Pin (20µs Pulse) ........... –200mA
Current into DRAIN Pin (100µs Pulse)....................20mA
Maximum Junction Temperature........................... 125°C
Operating Temperature Range
LTC4252BC-1/LTC4252BC-2
LTC4252CC-1/LTC4252CC-2..................... 0°C to 70°C
LTC4252BI-1/LTC4252BI-2
LTC4252CI-1/LTC4252CI-2.................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
TOP VIEW
VIN 1
SS 2
SENSE 3
VEE 4
8 TIMER
7 UV/OV
6 DRAIN
5 GATE
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
TOP VIEW
VIN 1
PWRGD 2
SS 3
SENSE 4
VEE 5
10 TIMER
9 UV
8 OV
7 DRAIN
6 GATE
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4252BCMS8-1#PBF LTC4252BCMS8-1#TRPBF LTGDX
8-Lead Plastic MSOP
0°C to 70°C
LTC4252BCMS8-2#PBF LTC4252BCMS8-2#TRPBF LTGDZ
8-Lead Plastic MSOP
0°C to 70°C
LTC4252BIMS8-1#PBF LTC4252BIMS8-1#TRPBF LTGDX
8-Lead Plastic MSOP
–40°C to 85°C
LTC4252BIMS8-2#PBF LTC4252BIMS8-2#TRPBF LTGDZ
8-Lead Plastic MSOP
–40°C to 85°C
LTC4252BCMS-1#PBF LTC4252BCMS-1#TRPBF LTGDY
10-Lead Plastic MSOP
0°C to 70°C
LTC4252BCMS-2#PBF LTC4252BCMS-2#TRPBF LTGFB
10-Lead Plastic MSOP
0°C to 70°C
LTC4252BIMS-1#PBF
LTC4252BIMS-1#TRPBF LTGDY
10-Lead Plastic MSOP
–40°C to 85°C
LTC4252BIMS-2#PBF
LTC4252BIMS-2#TRPBF LTGFB
10-Lead Plastic MSOP
–40°C to 85°C
LTC4252CCMS-1#PBF LTC4252CCMS-1#TRPBF LTGFC
10-Lead Plastic MSOP
0°C to 70°C
LTC4252CCMS-2#PBF LTC4252CCMS-2#TRPBF LTGFD
10-Lead Plastic MSOP
0°C to 70°C
LTC4252CIMS-1#PBF
LTC4252CIMS-1#TRPBF LTGFC
10-Lead Plastic MSOP
–40°C to 85°C
LTC4252CIMS-2#PBF
LTC4252CIMS-2#TRPBF LTGFD
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
4252b12f
2


Part Number LTC4252B-1
Description Negative Voltage Hot Swap Controllers
Maker Linear
Total Page 30 Pages
PDF Download

LTC4252B-1 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 LTC4252B-1 Negative Voltage Hot Swap Controllers
Linear
2 LTC4252B-2 Negative Voltage Hot Swap Controllers
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy