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
RESET
output pin. An ON pin provides on/off control
and a
FAULT
pin indicates the fault status. The LTC4216
is available in the 10-lead MSOP and 12-lead (4mm
×
3mm) DFN packages.
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.
n
n
n
n
n
n
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
Internal Charge Pump for N-Channel MOSFET
Adjustable Output Power-Up Rate
RESET
and
FAULT
Output
10-Lead MSOP and 12-Lead (4mm
×
3mm) DFN
Packages
applicaTions
n
n
n
n
Electronic Circuit Breaker
Live Board Insertion and Removal
Industrial High Side Switch/Circuit Breaker
Optical Networking
Typical applicaTion
Single Channel 1.8V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V
IN
1.8V
LONG
0.004
Si4864DY
17.4k
1%
3.3V
10k
1%
10k
V
GATE
5V/DIV
Normal Power-Up
with Soft-Start
V
OUT
1.8V
5A
+
1000µF
V
CC
3.3V
LONG
22
V
CC
330nF
SENSEP SENSEN GATE
LTC4216
FB
I
OUT
2.5A/DIV
10k
µP
LOGIC
FAULT
RESET
SHORT
15k
1%
LONG
ON
20k TIMER
1%
10nF
SS
FILTER
18nF
FAULT
GND
RESET
V
OUT
1V/DIV
GND
10nF
0.5ms/DIV
4216 TA01
4216 TA01b
4216fa
For more information
www.linear.com/LTC4216
1
LTC4216
absoluTe MaxiMuM raTings
(Note 1)
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
RESET, FAULT
.......................................... –0.3V to 9V
GATE ...................................................... –0.3V to 15V
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 150°C
Lead Temperature (Soldering, 10sec)
MS Package ...................................................... 300°C
pin conFiguraTion
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
RESET
ON
FILTER
TIMER
GND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
V
CC
SENSEP
SENSEN
GATE
FB
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 160°C/W
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)
orDer inForMaTion
LEAD FREE FINISH
LTC4216CDE#PBF
LTC4216IDE#PBF
LTC4216CMS#PBF
LTC4216IMS#PBF
TAPE AND REEL
LTC4216CDE#TRPBF
LTC4216IDE#TRPBF
LTC4216CMS#TRPBF
LTC4216IMS#TRPBF
PART MARKING*
4216
4216
LTBKV
LTBKV
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
elecTrical characTerisTics
SYMBOL
V
CC
V
SENSEP
I
CC
V
CC(UVL)
PARAMETER
Bias Supply Range
V
SENSEP
Supply Range
Bias Supply Current
Bias Supply Undervoltage Lockout
The
l
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
l
l
MIN
2.3
0
TYP
MAX
6
6
UNITS
V
V
mA
V
mV
4216fa
V
ON
= 2V, V
FB
= 2V
V
CC
Rising
l
l
l
1.6
1.97
50
2.12
120
3
2.23
190
ΔV
CC(UVL,HYST)
Bias Supply Undervoltage
Lockout Hysteresis
2
For more information
www.linear.com/LTC4216
LTC4216
The
l
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)
SYMBOL
ΔV
CB(TH)
ΔV
ACL(TH)
I
SENSEP(IN)
I
SENSEN(IN)
I
GATE(UP)
I
GATE(DN)
PARAMETER
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
GATE Pull Up Current
GATE Pull Down Current
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
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
FAULT
Falling
V
ON
= 0V, V
FAULT
= 1.5V
I
RESET
= I
FAULT
= 1.6mA
V
RESET
= V
CC
= 6V
(V
SENSEP
- V
SENSEN
) = Step 0V to 150mV
(V
SENSEP
- V
SENSEN
) = Step 0V to 30mV,
V
SENSEP
= V
CC
, FILTER = 10nF to GND
l
l
l
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
V
SENSEP
= 0.4V, 3.3V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
22.5
21.5
32
20
TYP
25
25
40
70
–7
10
–10
–20
600
5
50
5.0
6.2
0.2
1.65
0.2
–10
–1
8
0.602
0.2
3
0
MAX
27.5
28.5
48
250
–20
15
–15
–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
3
360
UNITS
mV
mV
mV
µA
µA
µA
µA
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
4216fa
–5
–16
100
1
15
4.0
4.5
0.15
1.3
0.15
–7
–0.3
0.593
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
FAULT(TH)
ΔV
FAULT(HYST)
I
FAULT(UP)
V
OL
I
RESET(LEAK)
t
CB(TRIP)
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
FAULT
Pin Threshold Voltage
FAULT
Pin Hysteresis
FAULT
Pin Current
Output Low Voltage (RESET,
FAULT)
RESET
Pin Input Leakage Current
Circuit Breaker Trip to Gate Discharging
l
l
l
l
l
l
l
l
0.77
40
0.36
1.216
0.15
–1.5
1.216
0.15
–45
1.5
1.216
–3
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
1
240
l
l
120
For more information
www.linear.com/LTC4216
3
LTC4216
The
l
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)
SYMBOL
t
FAULT(EXT)
t
FILTER
t
RST(ONLO)
t
RST(VCCLO)
t
OFF
PARAMETER
FAULT
Low to Gate Discharging
FILTER High to Gate Discharging
Circuit Breaker Reset Delay Time,
ON Low to
FAULT
High
Circuit Breaker Reset Delay Time,
V
CC
Low to
FAULT
High
Turn-Off Time, ON Low to GATE
Discharging
CONDITIONS
V
FAULT
= 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
l
l
l
l
elecTrical characTerisTics
MIN
TYP
10
20
30
50
15
MAX
20
40
60
100
UNITS
µs
µs
µs
µs
µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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
