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LTC4252BCMS-2#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
1
4252b12f
TYPICAL APPLICATION
FEATURES DESCRIPTION
Negative Voltage
Hot Swap Controllers
The LT C
®
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 LTC4252-2 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.
–48V/2.5A Hot Swap Controller
Start-Up Behavior
APPLICATIONS
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
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
L, LT , LT C , LT M, 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.
4252B12 TA01
–48RTN
OV
UV
V
EE
V
IN
SENSESS
TIMER GATE
PWRGD
DRAIN
LTC4252B-1
R1
402k
1%
R2
32.4k
1%
C
T
0.33µF
D
IN
†
DDZ13B
**
C
SS
68nF
C
C
18nF
–48V
R
S
0.02Ω
Q1
IRF530S
V
OUT
R
C
10Ω
R3
5.1k
R
IN
3× 1.8k IN SERIES
1/4W EACH
C1
10nF
C
IN
1µF
C
L
100µF
–48RTN
(SHORT PIN)
+
R
D
1M
LOAD
EN
*
* M0C207
**DIODES, INC
†
RECOMMENDED FOR HARSH ENVIRONMENTS
4252B12 TA01a
GATE
5V/DIV
SENSE
2.5A/DIV
PWRGD
10V/DIV
1ms/DIV
V
OUT
20V/DIV
LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
2
4252b12f
ABSOLUTE MAXIMUM RATINGS
Current into V
IN
(100µs Pulse) .............................100mA
V
IN
, 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
All Voltages Referred to V
EE
(Note 1)
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
V
IN
SS
SENSE
V
EE
TIMER
UV/OV
DRAIN
GATE
T
JMAX
= 125°C, θ
JA
= 160°C/W
1
2
3
4
5
V
IN
PWRGD
SS
SENSE
V
EE
10
9
8
7
6
TIMER
UV
OV
DRAIN
GATE
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 160°C/W
PIN CONFIGURATION
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 LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
Consult LT C 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/
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
LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
3
4252b12f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS
LTC4252B-1/-2 LTC4252C-1/-2
UNITSMIN TYP MAX MIN TYP MAX
V
Z
V
IN
– V
EE
Zener Voltage I
IN
= 2mA
l
11.5 13 14.5 11.5 13 14.5 V
r
Z
V
IN
– V
EE
Zener Dynamic Impedance I
IN
= 2mA to 30mA 5 5 Ω
I
IN
V
IN
Supply Current UV = OV = 4V, V
IN
= (V
Z
– 0.3V)
●
0.8 2 0.9 2 mA
V
LKO
V
IN
Undervoltage Lockout Coming Out of UVLO (Rising V
IN
)
●
9.2 11.5 9 10 V
V
LKH
V
IN
Undervoltage Lockout Hysteresis 1 0.5 V
V
CB
Circuit Breaker Current Limit Voltage V
CB
= (V
SENSE
– V
EE
)
●
40 50 60 45 50 55 mV
V
ACL
Analog Current Limit Voltage V
ACL
= (V
SENSE
– V
EE
),
SS = Open or 2.2V
●
80 100 120 mV
V
ACL
/
V
CB
Analog Current Limit Voltage/
Circuit Breaker Voltage
V
ACL
= (V
SENSE
– V
EE
),
SS = Open or 1.4V
●
1.05 1.20 1.38 V/V
V
FCL
Fast Current Limit Voltage V
FCL
= (V
SENSE
– V
EE
)
●
150 200 300 150 200 300 mV
V
SS
SS Voltage After End of SS Timing Cycle 2.2 1.4 V
R
SS
SS Output Impedance 100 50 kΩ
I
SS
SS Pin Current UV = OV = 4V, V
SENSE
= V
EE
,
V
SS
= 0V (Sourcing)
22 28 µA
UV = OV = 0V, V
SENSE
= V
EE
,
V
SS
= 2V (Sinking)
28 28 mA
V
OS
Analog Current Limit Offset Voltage 10 10 mV
V
ACL
+V
OS
/
V
SS
Ratio (V
ACL
+ V
OS
) to SS Voltage 0.05 0.05 V/V
I
GATE
GATE Pin Output Current UV = OV = 4V, V
SENSE
= V
EE
,
V
GATE
= 0V (Sourcing)
●
40 58 80 40 58 80 µA
UV = OV = 4V, V
SENSE
– V
EE
= 0.15V,
V
GATE
= 3V (Sinking)
17 17 mA
UV = OV = 4V, V
SENSE
– V
EE
= 0.3V,
V
GATE
= 1V (Sinking)
190 190 mA
V
GATE
External MOSFET Gate Drive V
GATE
– V
EE
, I
IN
= 2mA
●
10 12 V
Z
10 12 V
Z
V
V
GATEH
Gate High Threshold V
GATEH
= V
IN
– V
GATE
, I
IN
= 2mA,
for PWRGD Status (MS Only
)
2.8 2.8 V
V
GATEL
Gate Low Threshold (Before Gate Ramp-Up) 0.5 0.5 V
V
UVHI
UV Pin Threshold HIGH
●
3.075 3.225 3.375 V
V
UVLO
UV Pin Threshold LOW
●
2.775 2.925 3.075 V
V
UV
UV Pin Threshold Low-to-High Transition
●
3.05 3.08 3.11 V
V
UVHST
UV Pin Hysteresis (● for LTC4252C Only)
●
300 292 324 356 mV
V
OVHI
OV Pin Threshold HIGH
●
5.85 6.15 6.45 V
V
OVLO
OV Pin Threshold LOW
●
5.25 5.55 5.85 V
V
OV
OV Pin Threshold Low-to-High Transition
●
5.04 5.09 5.14 V
V
OVHST
OV Pin Hysteresis (● for LTC4252C Only)
●
600 82 102 122 mV
I
SENSE
SENSE Pin Input Current UV = OV = 4V, V
SENSE
= 50mV
●
–15 –30 –15 –30 µA
I
INP
UV, OV Pin Input Current UV = OV = 4V
●
±0.1 ±1 ±0.1 ±1 µA
V
TMRH
TIMER Pin Voltage High Threshold 4 4 V
V
TMRL
TIMER Pin Voltage Low Threshold 1 1 V
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LTC4252BCMS-2#TRPBF

Mfr. #:
Buy LTC4252BCMS-2#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Neg V Hot Swap Cntrs
Lifecycle:
New from this manufacturer.
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