LTC4216
Ultralow Voltage
Hot Swap Controller
FEATURES
■
■
■
■
■
■
DESCRIPTIO
■
■
■
■
■
■
Allows Safe Board Insertion and Removal from
a Live Backplane
Controls Load Voltages from 0V to 6V
Fast Response Limits Peak Fault Current
Adjustable Analog Current Limit
Adjustable Soft-Start with Inrush Current Limiting
Adjustable Response Time for Overcurrent
Protection
Low Circuit Breaker Trip Threshold: 25mV
No External Gate Capacitor Required
Gate Drive for External N-Channel MOSFET
Adjustable Supply Voltage Power-Up Rate
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T and
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T Output
10-Lead MSOP and 12-Lead (4mm
×
3mm) DFN
Packages
The LTC
®
4216 is a positive low-voltage Hot Swap
TM
controller that allows a board to be safely inserted and
removed from a live backplane. It controls load voltages
ranging from 0V to 6V and isolates a severe fault with
instantaneous analog current limiting.
An internal high side switch driver controls the gate of
an external N-channel MOSFET. An adjustable soft-start
limits the rate of change of the inrush current at start-up
for a large load capacitor. Together with an analog current
limit amplifier, an electronic circuit breaker with adjustable
response time provides dual level overcurrent protection.
No external gate capacitor is required for the analog cur-
rent limit loop compensation.
The FB pin monitors the output supply voltage and signals
the
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T output pin. An ON pin provides on/off control
and a
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T pin indicates the fault status. The LTC4216
is available in the 10-lead MSOP and 12-lead (4mm
×
3mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
■
■
■
■
Electronic Circuit Breaker
Live Board Insertion and Removal
Industrial High Side Switch/Circuit Breaker
Optical Networking
TYPICAL APPLICATIO
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V
IN
1.8V
LONG
Single Channel 1.8V Hot Swap Controller
0.004Ω
Si4864DY
+
LONG
22Ω
V
CC
330nF
LTC4216
SHORT
15k
1%
LONG
ON
20k TIMER
1%
10nF
SS
FILTER
18nF
FAULT
GND RESET
SENSEP SENSEN GATE
17.4k
1%
3.3V
FB
10k
1%
10k
10k
µP
LOGIC
FAULT
RESET
1000µF
V
OUT
1.8V
5A
V
CC
3.3V
GND
10nF
4216 TA01
U
Normal Power-Up
with Soft-Start
V
GATE
5V/DIV
I
OUT
2.5A/DIV
V
OUT
1V/DIV
0.5ms/DIV
4216 TA01b
U
U
4216f
1
LTC4216
ABSOLUTE
(Note 1)
AXI U RATI GS
Operating Temperature Range
LTC4216C ................................................ 0°C to 70°C
LTC4216I .............................................–40°C to 85°C
Storage Temperature Range
MS .....................................................–65°C to 150°C
DE ......................................................–65°C to 125°C
Lead Temperature (Soldering, 10sec)
MS Package ...................................................... 300°C
Bias Supply Voltage (V
CC
) ............................– 0.3V to 9V
Input Voltages
FB, ON, SS, SENSEP, SENSEN .................– 0.3V to 9V
TIMER, FILTER............................ –0.3V to V
CC
+ 0.3V
Output Voltages
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T,
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T ......................................... –0.3V to 9V
GATE ...................................................... –0.3V to 15V
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RESET
ON
FILTER
TIMER
SS
GND
1
2
3
4
5
6
13
12 FAULT
11 V
CC
10 SENSEP
9
8
7
SENSEN
GATE
FB
ORDER PART
NUMBER
LTC4216CDE
LTC4216IDE
DE PART*
MARKING
4216
TOP VIEW
RESET
ON
FILTER
TIMER
GND
1
2
3
4
5
10
9
8
7
6
V
CC
SENSEP
SENSEN
GATE
FB
DE PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 13)
INTERNALLY CONNECTED TO GND
(PCB CONNECTION OPTIONAL)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is indicated by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
V
SENSEP
I
CC
V
CC(UVL)
ΔV
CC(UVL,HYST)
ΔV
CB(TH)
ΔV
ACL(TH)
I
SENSEP(IN)
I
SENSEN(IN)
PARAMETER
Bias Supply Range
V
SENSEP
Supply Range
Bias Supply Current
Bias Supply Undervoltage Lockout
Bias Supply Undervoltage
Lockout Hysteresis
Circuit Breaker Trip Voltage Threshold
(V
SENSEP
– V
SENSEN
)
Analog Current Limit Voltage Threshold
(V
SENSEP
– V
SENSEN
)
SENSEP Pin Input Current
SENSEN Pin Input Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise noted. (Note 2)
CONDITIONS
●
●
V
ON
= 2V, V
FB
= 2V
V
CC
Rising
V
SENSEP
= V
SENSEN
= V
CC
= 6V
V
SENSEP
= V
SENSEN
= 0V, V
CC
= 6V
V
SENSEN
= V
SENSEP
= V
CC
= 6V
V
SENSEN
= V
SENSEP
= 0V, V
CC
= 6V
2
U
U
W
W W
U
W
ORDER PART
NUMBER
LTC4216CMS
LTC4216IMS
MS PART*
MARKING
LTBKV
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 160°C/W
MIN
2.3
0
TYP
MAX
6
6
UNITS
V
V
mA
V
mV
mV
mV
mV
µA
µA
µA
µA
4216f
●
●
●
1.6
1.97
50
22.5
21.5
32
20
2.12
120
25
25
40
70
–7
10
–10
3
2.23
190
27.5
28.5
48
250
–20
15
–15
●
●
●
●
●
●
–5
LTC4216
ELECTRICAL CHARACTERISTICS
SYMBOL
I
GATE(UP)
I
GATE(DN)
PARAMETER
GATE Pull Up Current
GATE Pull Down Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise noted. (Note 2)
CONDITIONS
Gate Drive On, V
GATE
= 0V, V
ON
= 2V
Gate Drive Off, V
GATE
= 5V, V
ON
= 0.6V
V
SENSEP
- V
SENSEN
= 55mV, V
GATE
= 5V
V
SENSEP
- V
SENSEN
= 100mV, V
GATE
= 5V
2.3V ≤ V
CC
< 3V
3V ≤ V
CC
≤ 6V
V
GATE
Falling
After End of SS Timing Cycle
V
SS
Falling
V
ON
= 2V, V
SS
= 1.2V, V
FB
= 2V
V
ON
= 2V, V
FB
= 0V
V
ON
= 0V, V
SS
= 2V
V
FB
Falling
2.3V ≤ V
CC
≤ 6V
V
FB
= 1.2V, V
CC
= 6V
V
ON
Rising
V
ON
Falling
V
ON
= 1.2V, V
CC
= 6V
V
TIMER
Rising
V
TIMER
Falling
Timer On, V
ON
= 2V, V
TIMER
= 1V
Timer Off, V
ON
= 0V, V
TIMER
= 2V
V
FILTER
Rising
V
FILTER
Falling
V
ON
= 2V, V
FILTER
= 1V, In Fault Mode
V
ON
= 2V, V
FILTER
= 1V, No Faults
V
ON
= 0V, V
FILTER
= 2V, In Reset Mode
V
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T
Falling
V
ON
= 0V, V
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T
= 1.5V
I
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T
= I
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T
= 1.6mA
V
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T
= V
CC
= 6V
(V
SENSEP
- V
SENSEN
) = Step 0V to 30mV,
V
SENSEP
= V
CC
, FILTER = 10nF to GND
V
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T
= Step 2V to 0V
V
FILTER
= Step 0V to 2V
V
ON
= Step 2V to 0V
V
ON
= 2V, V
CC
= Step 3.3V to 1.8V
V
ON
= Step 2V to 0.6V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
–16
100
1
15
4.0
4.5
0.15
1.3
0.15
–7
– 0.3
0.593
TYP
–20
600
5
50
5.0
6.2
0.2
1.65
0.2
–10
–1
8
0.602
0.2
3
0
0.8
80
0.4
0
1.253
0.2
–2
8
1.253
0.2
–60
2.4
8
1.253
10
–5
0.15
0
240
10
20
30
50
15
MAX
–26
1500
20
100
7.9
7.9
0.3
2.0
0.35
–13
–2
0.611
3
±1
0.83
130
0.44
±1
1.291
0.35
–2.5
1.291
0.35
–75
3.3
1.291
–7
0.4
±10
360
20
40
60
100
UNITS
µA
µA
mA
mA
V
V
V
V
V
µA
µA
mA
V
mV
mV
µA
V
mV
V
µA
V
V
µA
mA
V
V
µA
µA
mA
V
mV
µA
V
µA
µs
µs
µs
µs
µs
µs
ΔV
GATE
V
GATE(TH)
V
SS(CLP)
V
SS(TH)
I
SS(UP)
I
SS(DN)
V
FB(TH)
ΔV
FB(LINEREG)
ΔV
FB(HYST)
I
FB(IN)
V
ON(TH)
ΔV
ON(HYST)
V
ON(FC)
I
ON(IN)
V
TMR(TH)
I
TMR(UP)
I
TMR(DN)
V
FILT(TH)
I
FILT(UP)
I
FILT(DN)
V
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T(TH)
ΔV
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T(HYST)
I
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T(UP)
V
OL
I
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T(LEAK)
t
CB(TRIP)
t
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T(EXT)
t
FILTER
t
RST(ONLO)
t
RST(VCCLO)
t
OFF
External N-Channel Gate Drive
(V
GATE
– V
SENSEN
)
GATE Pin Threshold Voltage
SS Pin Clamp Voltage
SS Pin Threshold Voltage
SS Pull Up Current
SS Pull Down Current
FB Pin Threshold Voltage
FB Pin Threshold Line Regulation
FB Pin Hysteresis
FB Pin Input Current
ON Pin Threshold Voltage
ON Pin Hysteresis
ON Pin Fault Clear Threshold Voltage
ON Pin Input Current
TIMER Pin Threshold Voltage
Timer Pull Up Current
Timer Pull Down Current
FILTER Pin Threshold Voltage
Filter Pull Up Current
Filter Pull Down Current
⎯
FA
⎯
U
⎯
L
⎯
T Pin Threshold Voltage
⎯
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T Pin Hysteresis
⎯
FAULT Pin Current
⎯ ⎯ ⎯ ⎯
Output Low Voltage (
⎯
R
⎯
E
⎯
S
⎯
E
⎯
T,
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T)
⎯ ⎯ ⎯ ⎯ ⎯
RESET Pin Input Leakage Current
Circuit Breaker Trip to Gate
Discharging
⎯ ⎯ ⎯ ⎯ ⎯
FAULT Low to Gate Discharging
FILTER High to Gate Discharging
Circuit Breaker Reset Delay Time,
ON Low to
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T High
Circuit Breaker Reset Delay Time,
V
CC
Low to
⎯
F
⎯
A
⎯
U
⎯
L
⎯
T High
Turn-Off Time, ON Low to GATE Discharging
0.77
40
0.36
1.216
0.15
–1.5
1.216
0.15
–45
1.5
1.216
–3
120
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
All currents into device pins are positive; all currents out of
the device pins are negative; all voltages are referenced to GND unless
otherwise specified.
4216f
3
LTC4216
TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise noted.
I
CC
vs V
CC
3.0
3.0
2.5
I
CC
(mA)
I
CC
(mA)
2.0
2.0
V
CC
= 6V
V
CC
= 3.3V
V
CC
= 2.3V
V
CC(UVL)
(V)
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0 4.5
V
CC
(V)
ΔV
CB(TH)
vs Temperature
27
7.0
26
∆V
CB(TH)
(mV)
∆V
GATE
(V)
V
GATE
(V)
25
24
23
–50
–25
25
75
0
50
TEMPERATURE (°C)
ΔV
ACL(TH)
vs Temperature
42
–22
41
∆V
ACL(TH)
(mV)
I
GATE(UP)
(µA)
V
FB(TH)
(V)
40
39
38
–50
–25
25
75
0
50
TEMPERATURE (°C)
4
U W
5.0
5.5
100
100
Specifications are at T
A
= 25°C. V
CC
= 3.3V,
I
CC
vs Temperature
2.20
2.15
2.10
2.05
V
CC(UVL)
vs Temperature
2.5
RISING
1.5
FALLING
2.00
1.0
1.95
1.90
–50
6.0
0.5
–50
–25
25
75
0
50
TEMPERATURE (°C)
100
125
–25
25
75
0
50
TEMPERATURE (°C)
100
125
4216 G01
4216 G02
4216 G03
ΔV
GATE
vs Temperature
V
SENSEP
= V
SENSEN
= V
CC
14
12
V
CC
= 5V
6.0
V
CC
= 3.3V
10
8
6
4
2
–25
25
75
0
50
TEMPERATURE (°C)
100
125
V
GATE
vs V
SENSEN
V
CC
= 6V
6.5
5.5
V
CC
= 2.5V
5.0
125
4.5
–50
0
1
2
3
4
V
SENSEN
(V)
5
6
4216 G06
4216 G04
4216 G05
I
GATE(UP)
vs Temperature
0.611
V
FB(TH)
vs Temperature
–21
0.608
RISING
0.605
FALLING
–20
0.602
–19
0.599
125
–18
–50
–25
25
75
0
50
TEMPERATURE (°C)
100
125
0.596
–50
–25
25
75
0
50
TEMPERATURE (°C)
100
125
4216 G07
4216 G08
4216 G09
4216f
LTC4216
TYPICAL PERFOR A CE CHARACTERISTICS
V
TMR(TH)
vs Temperature
1.27
0.90
0.85
1.26
V
TMR(TH)
(V)
0.80
1.25
V
ON(TH)
(V)
0.75
FALLING
0.70
1.24
0.65
1.23
–50
0.60
–50
1.23
–50
RISING
V
FAULT(TH)
(V)
1.26
–25
25
75
0
50
TEMPERATURE (°C)
I
TMR(UP)
vs Temperature
–2.2
1.27
–2.1
I
TMR(UP)
(µA)
V
FILT(TH)
(V)
V
SS(CLP)
(V)
–2.0
–1.9
–1.8
–50
–25
25
75
0
50
TEMPERATURE (°C)
I
FILT(UP)
vs Temperature
–70
2.8
–65
I
FILT(DN)
(µA)
I
FILT(UP)
(µA)
I
SS(UP)
(µA)
–60
–55
–50
–50
–25
25
75
0
50
TEMPERATURE (°C)
U W
100
100
100
V
ON(TH)
vs Temperature
1.27
V
FAULT(TH)
vs Temperature
1.25
1.24
125
–25
25
75
0
50
TEMPERATURE (°C)
100
125
–25
25
75
0
50
TEMPERATURE (°C)
100
125
4216 G10
4216 G11
4216 G12
V
FILT(TH)
vs Temperature
1.9
V
SS(CLP)
vs Temperature
1.26
1.8
1.7
1.25
1.6
1.24
1.5
125
1.23
–50
–25
25
75
0
50
TEMPERATURE (°C)
100
125
1.4
–50
–25
25
75
0
50
TEMPERATURE (°C)
100
125
4216 G13
4216 G14
4216 G15
I
FILT(DN)
vs Temperature
–12
–10
2.6
–8
2.4
–6
–4
2.2
–2
2.0
–50
I
SS(UP)
vs Temperature
V
FB
= 2V
V
FB
= 0V
–25
25
75
0
50
TEMPERATURE (°C)
100
125
125
–25
25
75
0
50
TEMPERATURE (°C)
100
125
0
–50
4216 G16
4216 G17
4216 G18
4216f
5
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