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Linear Technology Electronic Components Datasheet

LTC4214-2CMS Datasheet

Negative Low Voltage Hot Swap Controllers

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FEATURES
s Allows Safe Board Insertion and Removal from a
Live Backplane
s Controls Supplies from 0V to –16V
s Adjustable Analog Current Limit With Circuit
Breaker Timer
s Fast Response Time Limits Peak Fault Current
s Adjustable Soft-Start Current Limit
s Adjustable Timer with Drain Voltage Accelerated
Response
s Adjustable Undervoltage/Overvoltage Protection
s LTC4214-1: Latch Off After Fault
s LTC4214-2: Automatic Retry After Fault
s Available in the 10-Pin MSOP Package
U
APPLICATIO S
s Hot Board Insertion
s Electronic Circuit Breaker
s Negative Power Supply Control
s Central Office Switching
s High Availability Servers
s Disk Arrays
s Optical Networking/Switching
s ECL
LTC4214-1/LTC4214-2
Negative Low Voltage
Hot Swap Controllers
DESCRIPTIO
The LTC®4214 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 LTC4214 controls negative
supplies ranging from near zero to –16V. A multifunction
timer delays initial start-up and controls the circuit breaker’s
response time. This response time is accelerated by
sensing excessive MOSFET drain voltage, keeping the
MOSFET within its safe operating area (SOA). An adjust-
able soft-start circuit controls MOSFET inrush current at
start-up. A power good status output can enable a power
module at start-up or disable it if the circuit breaker trips.
The LTC4214-1 latches off after a circuit breaker fault times
out. The LTC4214-2 provides automatic retry after a fault.
The LTC4214 is available in the 10-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
3.3V
GND
10
100nF
GND
(SHORT PIN)
34k
1%
32.4k
1%
–5.2V
– 5.2V/5A ECL Supply Hot Swap Controller
2k
SMAJ7A
5.6nF
1nF PUSH
RESET
470
1
VIN
LTC4214-1 2
PWRGD
9, 8 UV/OV
7
DRAIN
10
6
TIMER GATE
3
SS
4
SENSE
VEE
5
3.3nF
0.1µF
22
EN
BSS138
CLOAD +
100µF
GND
–5.2V
ECL
75k
IRF7413
10
10nF
0.01
4214 TA01
GATE
5V/DIV
SENSE
20mV/DIV
VOUT
5V/DIV
PWRGD
5V/DIV
Start-Up Behavior
4214 TA02
421412f
1


Linear Technology Electronic Components Datasheet

LTC4214-2CMS Datasheet

Negative Low Voltage Hot Swap Controllers

No Preview Available !

wwwL.DTataCShe4et42U.c1om4-1/LTC4214-2
ABSOLUTE AXI U RATI GS
All Voltages Referred to VEE (Note 1)
VIN ............................................................ – 0.3V to 17V
Input/Output Pins
(Except SENSE and DRAIN) Voltage ..........– 0.3V to 17V
SENSE Pin Voltage ................................... – 0.6V to 17V
Current Out of SENSE Pin (20µs Pulse) ........... – 200mA
DRAIN Pin Minimum Voltage .............................. – 0.3V
Current into DRAIN Pin (100µs Pulse) ................... 5mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
LTC4214-1C/LTC4214-2C ....................... 0°C to 70°C
LTC4214-1I/LTC4214-2I ................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
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
LTC4214-1CMS
LTC4214-2CMS
LTC4214-1IMS
LTC4214-2IMS
MS PART MARKING
LTABH
LTABK
LTABJ
LTABL
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, UV = OV = 2.5V unless otherwise noted. (Note 2)
SYMBOL
VIN
IIN
VLKO
VLKH
VCB
VACL
VFCL
VSS
RSS
ISS
PARAMETER
Supply Voltage
VIN Supply Current
VIN Undervoltage Lockout
VIN Undervoltage Lockout Hysteresis
Circuit Breaker Current Limit Voltage
Analog Current Limit Voltage
Fast Current Limit Voltage
SS Voltage
SS Output Impedance
SS Pin Current
VOS
Analog Current Limit Offset Voltage
VACL+VOS Ratio (VACL + VOS) to SS Voltage
VSS
IGATE
GATE Pin Output Current
VGATE
VGATEH
VGATEL
VUVHI
VUVHST
VOVHI
VOVHST
External MOSFET Gate Drive
Gate High Threshold
Gate Low Threshold
UV Pin Threshold
UV Pin Hysteresis
OV Pin Threshold
OV Pin Hysteresis
CONDITIONS
MIN TYP MAX UNITS
q6
16
V
UV = OV = 2.5V
q
0.8
2
mA
Coming Out of UVLO (Rising VIN)
q
5.1
5.6
V
0.3
V
VCB = (VSENSE – VEE)
VACL = (VSENSE – VEE), SS = Open
VFCL = (VSENSE – VEE)
After End of SS Timing Cycle
q 44
50
56
mV
q 60
70
80
mV
q 150
200
300
mV
1.6
V
73
k
UV = OV = 2.5V, VSENSE = VEE, VSS = 0V (Sourcing)
– 22
µA
UV = OV = 0V, VSENSE = VEE, VSS = 1V (Sinking)
14
mA
10
mV
0.05
V/V
VSENSE = VEE, VGATE = 0V (Sourcing)
VSENSE – VEE = 0.15V, VGATE = 3V (Sinking)
VSENSE – VEE = 0.3V, VGATE = 1V (Sinking)
VGATE – VEE
VGATEH = VIN – VGATE for PWRGD Status
(Before Gate Ramp-Up)
UV Rising
OV Rising
q –30 –50 –70
µA
17
mA
190
mA
q 10
11
12
V
2.8
V
0.5
V
q 2.137 2.25 2.363
V
q 0.22 0.25 0.28
V
q 2.85
3
3.15
V
q 0.12 0.15 0.18
V
421412f
2


Part Number LTC4214-2CMS
Description Negative Low Voltage Hot Swap Controllers
Maker Linear
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