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LT4220CGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT4220
4220f
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Dual Supply
Hot Swap Controller
■
Hot Swap
TM
Controller for Positive
and Negative Supplies
■
Supply Tracking Mode
■
±2.7V to ±16.5V Operation
■
Analog Current Limit with Foldback
■
Allows Safe Board Insertion and Removal
from a Live Backplane
■
Open-Collector Power Good Comparators
■
Automatic Retry or Latchoff After a Current Fault
■
Dual Undervoltage Lockout Comparator Inputs
■
Current Fault Indication
■
Live Board Insertion
■
RAID Systems
■
–5.2V ECL Supplies
■
Industrial Controls
■
Split Supply Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT
®
4220 16-pin dual voltage Hot Swap controller
allows a board to be safely inserted and removed from a
live backplane. The device operates with any combination
of 2.7V to 16.5V and –2.7V to –16.5V supplies. Using two
external N-channel pass transistors, the board supply
voltages can be ramped up at an adjustable rate. A select-
able tracking mode allows dual supply tracking control for
ramping the positive and negative supplies together.
The LT4220 features foldback current limit and latches off
both gates if either supply remains in current limit longer
than an adjustable time period. The IC can be configured
for automatic restart after a delay set by the same timer.
A power good signal indicates when the output voltages
monitored by the two FB comparators are within tolerance,
and the gate drive signals are at their full on voltage.
The LT4220 is available in a 16-lead narrow SSOP
package.
Hot Swap is a trademark of Linear Technology Corporation.
V
CC
ON
+
C6
1µF
C5
1µF
R2
4.99k
R1
36.5k
R4
4.99k
R3
36.5k
–12V
V
EE
12V
V
CC
FAULT
TIMER
GND
TRACK
ON
–
PWRGD
FB
+
R10
4.99k
R9
36.5k
12V
V
OUT
+
R12
4.99k
R11
36.5k
4220 TA01
–12V
V
OUT
–
R7
10Ω
FB
–
SENSE
+
R
S
+
0.005Ω
R
S
–
0.005Ω
GATE
+
R6
1k
R5
10Ω
C1
10nF
R8
1k
C2
10nF
C3
100nF
Q1
SUB85N03-04
V
EE
SENSE
–
SENSEK
LT4220
GATE
–
Q2
SUB85N03-04
CL2
CL1
Z2*
R14
10Ω
CONNECTOR 1
CONNECTOR 2
C4
100nF
Z1*
R13
10Ω
V
IN
+
V
IN
–
* 1SMA13AT3 TRANSIENT
VOLTAGE SUPPRESSOR
+
+
716
15 14
12
34
12
11
6
8
9
10
13
5
R15
20k
R16, 20k
C7
10nF
C8
10nF
D1
IN4001
D2
IN4001
±12V 10A Hot Swap Controller
12V
V
IN
+
12V
V
OUT
+
–12V
V
IN
–
–12V
V
OUT
–
TIME (10ms/DIV)
2
LT4220
4220f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Operating Range ● 2.7 16.5 V
I
CC
V
CC
Supply Current ● 2.7 4 mA
V
EE
V
EE
Operating Range ● –2.7 –16.5 V
I
EE
V
EE
Supply Current –1.6 –2.4 mA
V
PLKO
V
CC
Undervoltage Lockout ● 2.35 2.45 2.55 V
V
MLKO
V
EE
Undervoltage Lockout ● –2.4 –2.45 –2.5 V
V
ON
+
H
ON
+
ON Threshold ON
+
Rising ● 1.22 1.24 1.26 V
V
ON
+
HYS
ON
+
Hysteresis ● 25 50 70 mV
∆V
ON
+
H
ON
+
ON Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.02 0.15 mV/V
∆V
ON
–
H
ON
–
ON Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.05 1 mV/V
V
ON
–
HYS
ON
–
Hysteresis ● 25 50 70 mV
V
ON
–
H
ON
–
ON Voltage Threshold ON
–
Falling ● –1.22 –1.24 –1.26 V
I
ON
+
ON
+
Input Current V
ON
+
= 2V ● 0.01 ±1 µA
I
ON
–
ON
–
Input Current V
ON
–
= GND ● 0.01 ±1 µA
V
FB
+
H
FB
+
PWRGD Voltage Threshold FB
+
Rising ● 1.22 1.24 1.26 V
V
FB
+
HYS
FB
+
Hysteresis Gate = 5V ● 25 50 70 mV
V
FB
–
H
FB
–
PWRGD Voltage Threshold FB
–
Falling ● –1.22 –1.24 –1.26 V
V
FB
–
HYS
FB
–
Hysteresis Gate = 3V ● 25 50 70 mV
(Notes 1, 2)
V
CC
to GND ............................................................. 22V
V
EE
to GND ........................................................... –22V
TRACK, TIMER .............................. – 0.3V to V
CC
+ 0.3V
ON
+
, FB
+
................................. V
EE
– 0.3V to V
CC
+ 0.3V
ON
–
, FB
–
.................................. V
EE
– 0.3V to V
CC
+ 0.3V
GATE
+
................................................ –0.3V to V
CC
+ 8V
GATE
–
..............................–16.5V with V
EE
= –22V to 0V
SENSE
+
............................................. –0.3V to V
CC
+ 5V
SENSE
–
,
SENSEK ....................... V
EE
– 0.3V to V
EE
+ 3V
PWRGD, FAULT ................................. –0.3V to V
CC
+ 5V
Operating Temperature Range
LT4220C...........................................0°C ≤ T
A
≤ 70°C
LT4220I ....................................... –40°C ≤ T
A
≤ 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LT4220CGN
LT4220IGN
GN PART MARKING
4220
4220I
T
JMAX
= 125°C, θ
JA
= 130°C/W
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
EE
= –5V, unless otherwise noted.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
V
EE
SENSEK
SENSE
–
GATE
–
FB
–
ON
–
TRACK
TIMER
V
CC
SENSE
+
GATE
+
FB
+
ON
+
FAULT
PWRGD
GND
DC ELECTRICAL CHARACTERISTICS
3
LT4220
4220f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
INFB
+
FB
+
Input Current FB
+
= 3V ● 0.09 ±1 µA
I
INFB
–
FB
–
Input Current FB
–
= –3V ● 0.08 ±1 µA
∆V
FB
+
H
FB
+
PWRGD Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.015 0.15 mV/V
∆
VFB
–
H
FB
–
PWRGD Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.05 0.5 mV/V
V
SENSE
+
SENSE
+
Trip Voltage (V
CC
– V
SENSE
+
)V
FB
+
= 0V, GATE
+
– 0.5V ● 61522 mV
V
FB
+
= 1V, GATE
+
– 0.5V 36 48 60 mV
V
SENSE
–
SENSE
–
Trip Voltage (V
SENSEK
– V
SENSE
–
)V
FB
–
= 0V, GATE
–
– 0.5V ● –10 –15 –22 mV
V
FB
–
= –1V, GATE
–
– 0.5V –43 –52 –61 mV
I
GATEUP
+
GATE
+
Pull-Up Current Charge Pump On, V
GATE
+
= 7V ● –9 –13 –17 µA
I
GATEUP
–
GATE
–
Pull-Up Current V
GATE
– = –3V ● –6 –10 –14 µA
I
GATEDN
+
GATE
+
Pull-Down Current Any Fault Condition, V
GATE
+
= 1V ● 20 40 60 mA
I
GATEDN
–
GATE
–
Pull-Down Current Any Fault Condition, V
GATE
–
= V
EE
+ 4V ● 30 70 130 mA
∆V
GATE
+
External N-Channel GATE
+
Drive V
GATE
+
– V
CC
, V
CC
= 2.7V, V
EE
= –2.7V ● 3.5 4 6 V
V
CC
= 5V to 16.5V, V
EE
= –5V to –16.5V 5 6.5 8 V
∆V
GATE
–
External N-Channel GATE
–
Drive V
GATE
–
– V
EE
, V
CC
= 2.7V, V
EE
= –2.7V ● 3.5 5.2 6 V
V
CC
= 5V to 16.5V, V
EE
= –5V to –16.5V 7.5 8.5 9 V
V
TIMERH
TIMER High Threshold, Sets FAULT ● 1.22 1.24 1.26 V
V
TIMERL
TIMER Low Threshold, Allows Restart ● 0.4 0.5 0.6 V
I
TIMERUP
TIMER Pull-Up Current TIMER = 0V ● –40 –65 –85 µA
I
TIMERDN
TIMER Pull-Down Current TIMER = 1V ● 2 3.3 4.5 µA
I
TIMER(R)
TIMER Current Ratio I
TIMERDN
/I
TIMERUP
57 %
V
OL
PWRGD Output Low Voltage I
O
= 2mA ● 0.3 V
I
O
= 5mA 0.5 V
I
OH
PWRGD Leakage Current V
PWRGD
= 16.5V ● 0.1 2 µA
V
FOL
FAULT Output Low Voltage I
O
= 2mA ● 0.3 V
I
O
= 5mA 0.5 V
I
FPH
FAULT Leakage Current V
FAULT
= 16.5V ● 0.06 2 µA
V
TRKTHR
TRACK Input Threshold ● 0.3 0.8 1.1 V
I
TRK
TRACK Input Current TRACK = 16.5V ● 0.05 2 µA
V
TRKFB
+
TRACK Mode FB
+
Threshold I
GATE
+
= 0µA, TRACK = V
CC
(Note 3) ● 40 70 mV
V
TRKFB
–
TRACK Mode FB
–
Threshold I
GATE
–
= 0µA, TRACK = V
CC
(Note 3) ● 40 80 mV
DC ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
EE
= –5V, unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT4220CGN#PBF

Mfr. #:
Buy LT4220CGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Dual Hot Swap Controller Pos/Neg
Lifecycle:
New from this manufacturer.
Delivery:
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