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LTC4212IMS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LTC4212
4212f
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
■
Allows Safe Board Insertion and Removal
from a Live Backplane
■
Controls Supply Voltages from 2.5V to 16.5V
■
Adjustable Soft-Start with Inrush Current
Limiting
■
Fast Turn-Off Time
■
No External Gate Capacitor is Required
■
Power Good Input with Adjustable Timer and
Glitch Filter
■
Power-Up Timeout Circuit Interfaces with External
Supply Monitors
■
Dual Level Overcurrent Fault Protection
■
Automatic Retry or Latched Mode Operation
■
High Side Drive for an External N-Channel FET
■
MS10 Package
The LTC
®
4212 is a Hot Swap
TM
controller that allows a
board to be safely inserted and removed from a live
backplane. An internal high side switch driver controls the
gate of an external N-channel MOSFET for supply voltages
ranging from 2.5V to 16.5V. The LTC4212 provides soft-
start and inrush current limiting during the start-up
period.
It features a power-up timeout circuit that discon-
nects the system supply when the onboard supplies do not
enter into regulation within an adjustable timeout period.
The controller interfaces with external supply monitor ICs
or directly with the PGOOD pin of a DC/DC converter. After
normal power-up, a programmable power good glitch
filter can be enabled to filter out short term dips in the
supplies.
Two current limit comparators provide dual level
overcurrent circuit breaker protection. The slow com-
parator trips at V
CC
– 50mV and activates in 18µs. The fast
comparator trips at V
CC
– 150mV and typically responds
in 500ns.
The LTC4212 can be configured for both latchoff and
autoretry applications and is available in a 10-pin MSOP
package.
■
Electronic Circuit Breaker
■
Hot Board Insertion and Removal
■
Self-Isolating Hot Swap Boards
Hot Swap Controller with
Power-Up Timeout
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
+
V
CC
SENSE
LTC4212
10µF
+
10µF
5V
2.5V
1.5A
3.3V
1.5A
4212 TA01a
GATE
PGT
PGFTIMER
0.01µF
PGI
ON
V
CC
5V
GND
Z1 = SMAJ10A (TVS)
20k
10k
10Ω
0.007Ω
EDGE
CONNECTOR
(MALE)
Si4410DY
Z1
10k
10k
2.1k
10k
FAULT
GND
FAULT
+
10µF
LT1963-2.5
4.7nF 270pF
100nF
BACKPLANE
CONNECTOR
(FEMALE)
+
10µF
+
10µF
LT1963-3.3
LTC1727-2.5
GND
V
CCA
V
CC3
COMP2.5 V
CC25
COMP3
COMP A
Power-Up Waveforms
ON
5V/DIV
TIMER
1V/DIV
PGT
1V/DIV
PGI
5V/DIV
Hot Swap Controller with Power Good Function
5ms/DIV
2
LTC4212
4212f
Supply Voltage (V
CC
) ............................................... 17V
Input Voltages
ON, PGI ................................................ –0.3V to 17V
SENSE .................................... –0.3V to (V
CC
+ 0.3V)
TIMER, PGT, PGF ....................................–0.3V to 2V
Output Voltages
GATE ............................... Internally Limited (Note 3)
FAULT .................................................. –0.3V to 17V
Operating Temperature Range
LTC4212C .............................................. 0°C to 70°C
LTC4212I........................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
ORDER PART
NUMBER
LTC4212CMS
LTC4212IMS
MS PART
MARKING
LTC5
LTC6
T
JMAX
= 125°C, θ
JA
= 200°C/W
1
2
3
4
5
ON
TIMER
PGT
PGF
GND
10
9
8
7
6
FAULT
V
CC
SENSE
GATE
PGI
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Supply Voltage Range ● 2.5 16.5 V
I
CC
V
CC
Supply Current ON = High, TIMER = Low ● 1 1.5 mA
V
LKO
Internal V
CC
Undervoltage Lockout V
CC
Low-to-High Transition ● 2.13 2.34 2.47 V
V
LKOHST
V
CC
Undervoltage Lockout Hysteresis 110 mV
I
INON
ON Input Current V
ON
= V
CC
or GND ±1 ±10 µA
I
LEAK
FAULT Leakage Current V
FAULT
= 15V, Pull-Down Device Off ● ±0.1 ±2.5 µA
I
INPGI
PGI Pin Input Current V
PGI
= V
CC
or GND ±1 ±10 µA
I
INSENSE
SENSE Input Current V
SENSE
= V
CC
or GND ±1 ±10 µA
V
CB(FAST)
SENSE Trip Voltage (V
CC
– V
SENSE
) Fast Comparator Trips ● 130 150 170 mV
V
CB(SLOW)
SENSE Trip Voltage (V
CC
– V
SENSE
) Slow Comparator Trips ● 40 50 60 mV
I
GATEUP
GATE Pull-Up Current Charge Pump On, V
GATE
≤ 0.2V ● –12.5 –10 –7.5 µA
I
GATEDOWN
Normal GATE Pull-Down Current ON Low ● 130 200 270 µA
Fast GATE Pull-Down Current FAULT Latched and Circuit Breaker 50 mA
Tripped or in UVLO, V
GATE
= 15V
∆V
GATE
External N-Channel Gate Drive V
GATE
– V
CC
(For V
CC
= 2.5V) ● 4.0 8 V
V
GATE
– V
CC
(For V
CC
= 2.7V) ● 4.5 8 V
V
GATE
– V
CC
(For V
CC
= 3.3V) ● 5.0 10 V
V
GATE
– V
CC
(For V
CC
= 5V) ● 10 16 V
V
GATE
– V
CC
(For V
CC
= 12V) ● 10 18 V
V
GATE
– V
CC
(For V
CC
= 15V), (Note 3) ● 815V
V
GATEOV
GATE Overvoltage Lockout Threshold ● 0.08 0.2 0.3 V
V
ONHI
ON Threshold High ● 1.23 1.316 1.39 V
V
ONLO
ON Threshold Low ● 0.4 0.455 0.5 V
V
PGI
Power Good Input Threshold ● 1.20 1.236 1.26 V
V
PGIHST
Power Good Input Hysterisis 28 mV
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
3
LTC4212
4212f
V
PGFHI
Power Good Glitch Filter High Threshold ● 1.20 1.236 1.26 V
V
PGFHST
Power Good Glitch Filter Hysterisis (Note 4) 40 mV
V
PGTHI
Power Good Timer High Threshold ● 0.928 0.952 0.976 V
V
PGTLO
Power Good Timer Low Threshold ● 0.640 0.657 0.680 V
V
PGT∆V
Power Good Timer Delta Threshold ● 0.283 0.295 0.304 V
I
PGT
Power Good Timer Pin Current Power Good Timer On, C
PGT
Charging, PGT = 0.65V ● –5.61 –5.1 –4.59 µA
Power Good Timer On, C
PGT
Discharging, PGT = 0.95V ● 4.63 5.2 5.77 µA
Power Good Timer Off, PGT = 1.5V 5 mA
I
PGF
Power Good Glitch Filter Pin Current Power Good Glitch Filter On, C
PGF
Charging ● –5.61 -5.1 –4.49 µA
Power Good Timer Off, PGF = 1.5V 5 mA
I
TMR
TIMER Current Timer On, V
TIMER
= 1V ● –2.5 –2 –1.5 µA
Timer Off, TIMER = 1.5V 5 mA
V
TMR
TIMER Threshold TIMER Low to High ● 1.20 1.236 1.26 V
TIMER High to Low
● 0.15 0.200 0.40 V
V
FAULT
FAULT Threshold Latched Off Threshold, FAULT High to Low ● 1.20 1.236 1.26 V
V
FAULTHST
FAULT Threshold Hysteresis 50 mV
V
OLFAULT
Output Low Voltage I
FAULT
= 1.6mA ● 0.14 0.4 V
t
TO
Power Good Time-Out C
PGT
=10nF, PGT = 0.1V to FAULT Low ● 16.3 18.16 20 ms
t
FAULTLO
Power Good Input Low at Time-Out to End of 14th PGT Cycle 1 µs
GATE Discharging
t
FAULTVG
Valid Power Good Glitch to GATE PGF > 1.26V 1.5 µs
Discharging
t
FAULTFC
FAST COMP Trip to GATE Discharging V
CB
= 0mV to 200mV Step ● 500 700 ns
t
FAULTSC
SLOW COMP Trip to GATE Discharging V
CB
= 0mV to 100mV Step ● 10 18 30 µs
t
EXTFAULT
FAULT Low to GATE Discharging V
FAULT
= 5V to 0V ● 135 µs
t
RESET
Circuit Breaker Reset Delay Time ON Low to FAULT High ● 120 250 µs
t
OFF
Turn-Off Time ON Low to GATE Off 10 µs
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All current into device pins are positive; all current out of device
pins are negative; all voltages are referenced to ground unless otherwise
specified.
Note 3: An internal clamp limits the GATE pin to a minimum of 10V above
V
CC
. Driving this pin to voltages beyond the clamp may damage the part. If
a lower GATE pin voltage is desired, use an external zener diode. The GATE
capacitance must be <0.15µF at maximum V
CC
.
Note 4: Guaranteed by design and not tested in production.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LTC4212IMS#TRPBF

Mfr. #:
Buy LTC4212IMS#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Hot Swap Controller w/Power Up Timer
Lifecycle:
New from this manufacturer.
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