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LTC4253CGN#PBF

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LTC4253/LTC4253A
1
425353aff
For more information www.linear.com/4253
–48V/2.5A Hot Swap Controller
Start-Up Behavior
TYPICAL APPLICATION
FEATURES DESCRIPTION
–48V Hot Swap Controllers
with Sequencer
The LT C
®
4253/LTC4253A negative voltage Hot Swap™
controllers allow 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 condi-
tions. The LTC4253/LTC4253A latch off after a circuit fault.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4253/LTC4253A’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 can be 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.
Three power good outputs are sequenced by an adjustable
timer and two ENABLE inputs to enable external power
modules at start-up or disable them if the circuit breaker
trips. The LTC4253A features tight ±1% undervoltage/
overvoltage threshold accuracy. The LTC4253/LTC4253A
are available in a 16-pin SSOP.
APPLICATIONS
n
Allows Safe Board Insertion and Removal from a
Live –48V Backplane
n
Floating Topology Permits Very High Voltage
Operation
n
Adjustable Analog Current Limit with Breaker Timer
Ideal for Two Battery Feeds
n
Fast Response Time Limits Peak Fault Current
n
Adjustable Undervoltage/Overvoltage Protection
with ±1% Threshold Accuracy (LTC4253A)
n
Three Sequenced Power Good Outputs
n
Adjustable Soft-Start Current Limit
n
Adjustable Timer with Drain Voltage Accelerated
Response
n
Latchoff After Fault
n
Available in a 16-Pin SSOP Package
n
–48V Distributed Power Systems
n
Negative Power Supply Control
n
Central Office Switching
n
High Availability Servers
n
Disk Arrays
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.
5.6k 5.6k 5.6k
†
PWRGD1
V
IN
EN2
EN3
V
IN
V
EE
LTC4253
LOAD1
PWRGD2
PWRGD3
OV
DRAIN
SS
GATE
SQTIMER
SENSETIMER
EN
LOAD2
EN
LOAD3
EN
2.5k
15k(1/4W)/6
UV
RESET
4253 TA01
10Ω
1M
0.02Ω
IRF530S
*DIODES, INC.
†
MOC207
††
RECOMMENDED FOR HARSH ENVIRONMENTS.
18nF
0.33µF
0.1µF
68nF
10nF
+
100µF
B3100*
402k
1%
–48V A
–48V B
–48V RTN
–48V RTN
B3100*
†
†
32.4k
1%
1µF
D
IN
††
DDZ13B*
GATE
10V
SS
1V
SENSE
50mV
V
OUT
50V
1ms/DIV
4253 TA01b
LTC4253/LTC4253A
2
425353aff
For more information www.linear.com/4253
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Current into V
IN
(100µs Pulse) .............................100mA
Current into DRAIN (100µs Pulse)
.........................20mA
V
IN
, DRAIN Minimum Voltage ................................–0.3V
Input/Output (Except SENSE
and DRAIN) Voltage
................................... –0.3V to 16V
SENSE Voltage
........................................... –0.6V to 16V
Current Out of SENSE (20µs Pulse)
.................. –200mA
Maximum Junction Temperature
.......................... 125°C
Operating Temperature Range
LTC4253C
................................................ 0°C to 70°C
LTC4253I
.............................................–40°C to 85°C
LTC4253AC (OBSOLETE)
......................... 0°C to 70°C
LTC4253AI (OBSOLETE)
......................–40°C to 85°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
(Note 1), All voltages referred to V
EE
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
16
15
14
13
12
11
10
9
EN2
PWRGD2
PWRGD1
V
IN
RESET
SS
SENSE
V
EE
PWRGD3
EN3
SQTIMER
TIMER
UV
OV
DRAIN
GATE
T
JMAX
= 125°C, θ
JA
= 130°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4253CGN#PBF LTC4253CGN#TRPBF 4253 16-Lead Plastic SSOP 0°C to 70°C
LTC4253IGN#PBF LTC4253IGN#TRPBF 4253I 16-Lead Plastic SSOP –40°C to 85°C
OBSOLETE PACKAGE
LTC4253ACGN#PBF LTC4253ACGN#TRPBF 4253A 16-Lead Plastic SSOP 0°C to 70°C
LTC4253AIGN#PBF LTC4253AIGN#TRPBF 4253AI 16-Lead Plastic SSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
LTC4253/LTC4253A
3
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For more information www.linear.com/4253
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
LTC4253 LTC4253A
UNITSMIN TYP MAX MIN TYP MAX
V
Z
V
IN
– V
EE
Zener Voltage I
IN
= 2mA
●
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 1.1 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
●
0.5 1 1.5 0.25 0.5 0.75 V
V
IH
TTL Input High Voltage
●
2 2 V
V
IL
TTL Input Low Voltage
●
0.8 0.8 V
V
HYST
TTL Input Buffer Hysteresis 600 600 mV
I
RESET
RESET Input Current V
EE
≤ V
RESET
≤ V
IN
●
±0.1 ±10 ±0.1 ±10 µA
I
EN
EN2, EN3 Input Current V
EN
= 4V V
EN
= 0V
●
●
60 120
±0.1
180
±10
60 120
±0.1
180
±10
µA
µA
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 Current Limit 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 2.2 2.4 1.25 1.4 1.55 V
I
SS
SS Pin Current UV = OV = 4V, V
SENSE
= V
EE,
V
SS
= 0V (Sourcing)
●
12 22 32 16 28 40 µA
UV = OV = 0V, V
SENSE
= V
EE,
V
SS
= 1V (Sinking)
28 28 mA
R
SS
SS Output Impedance 100 50 kΩ
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)
●
30 50 70 30 50 70 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
GATEL
Gate Low Threshold Before Gate Ramp Up 0.5 0.5 V
V
GATEH
Gate High Threshold V
GATEH
= V
IN
– V
GATE
, for PWRGD1,
PWRGD2, PWRGD3 Status
2.8 2.8 V
V
UVHI
UV Pin Threshold HIGH UV Low to High
●
3.075 3.225 3.375 V
V
UVLO
UV Pin Threshold LOW UV High to Low
●
2.775 2.925 3.075 V
V
UV
UV Pin Threshold UV Low to High
●
3.05 3.08 3.11 V
V
UVHST
UV Pin Hysteresis
●
230 300 350
292
324
356
mV
mV
V
OVHI
OV Pin Threshold HIGH OV Low to High
●
5.85 6.15 6.45 V
V
OVLO
OV Pin Threshold LOW OV High to Low
●
5.55 5.85 6.15 V
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LTC4253CGN#PBF

Mfr. #:
Buy LTC4253CGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers -48V Hot Swap Cntr w/ Sequencer
Lifecycle:
New from this manufacturer.
Delivery:
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