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LTC4252-1IMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
1
425212fe
For more information www.linear.com/LTC4252-1
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 LTC4252-1/LTC4252A-1 latch off after a circuit breaker
fault times out. The LTC4252-2/LTC4252A-2 provide au
-
tomatic retry after a fault. The LTC4252A-1/LTC4252A-2
feature tight ±1% under
voltage/over
voltage threshold
accuracy. The LTC4252 is available in either an 8-pin
or 10-pin MSOP, while the LTC4252A is available in the
10-pin MSOP.
–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 Accuracy
(LTC4252A)
■
Adjustable Undervoltage/Overvoltage Protection
■
LTC4252-1/LTC4252A-1: Latch Off After Fault
■
LTC4252-2/LTC4252A-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, 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.
425212 TA01
–48RTN
OV
UV
V
EE
V
IN
SENSESS
TIMER GATE
PWRGD
DRAIN
LTC4252-1
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
425212 TA01a
GATE
5V/DIV
SENSE
2.5A/DIV
PWRGD
10V/DIV
1ms/DIV
V
OUT
20V/DIV
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
2
425212fe
For more information www.linear.com/LTC4252-1
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
LTC4252-1CMS8#PBF LTC4252-1CMS8#TRPBF LTW M 8-Lead Plastic MSOP 0°C to 70°C
LTC4252-2CMS8#PBF LTC4252-2CMS8#TRPBF LTW P 8-Lead Plastic MSOP 0°C to 70°C
LTC4252-1IMS8#PBF LTC4252-1IMS8#TRPBF LTRQ 8-Lead Plastic MSOP –40°C to 85°C
LTC4252-2IMS8#PBF LTC4252-2IMS8#TRPBF LTRR 8-Lead Plastic MSOP –40°C to 85°C
LTC4252-1CMS#PBF LTC4252-1CMS#TRPBF LTW N 10-Lead Plastic MSOP 0°C to 70°C
LTC4252-2CMS#PBF LTC4252-2CMS#TRPBF LTW Q 10-Lead Plastic MSOP 0°C to 70°C
LTC4252A-1CMS#PBF LTC4252A-1CMS#TRPBF LTAFX 10-Lead Plastic MSOP 0°C to 70°C
LTC4252A-2CMS#PBF LTC4252A-2CMS#TRPBF LTAGE 10-Lead Plastic MSOP 0°C to 70°C
LTC4252-1IMS#PBF LTC4252-1IMS#TRPBF LTRS 10-Lead Plastic MSOP –40°C to 85°C
LTC4252-2IMS#PBF LTC4252-2IMS#TRPBF LT RT 10-Lead Plastic MSOP –40°C to 85°C
LTC4252A-1IMS#PBF LTC4252A-1IMS#TRPBF LTAFY 10-Lead Plastic MSOP –40°C to 85°C
LTC4252A-2IMS#PBF LTC4252A-2IMS#TRPBF LTAGF 10-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
LTC4252-1C/LTC4252-2C
LTC4252A-1C/LTC4252A-2C .................... 0°C to 70°C
LTC4252-1I/LTC4252-2I
LTC4252A-1I/LTC4252A-2I ................. –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................300°C
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
3
425212fe
For more information www.linear.com/LTC4252-1
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
LTC4252-1/-2 LTC4252A-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 LTC4252A 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 LTC4252A 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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36

LTC4252-1IMS8#PBF

Mfr. #:
Buy LTC4252-1IMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Negative 48V Hot Swap in MSOP
Lifecycle:
New from this manufacturer.
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