applications that allows a board to be safely inserted and
removed from a live backplane. The part integrates a Hot
Swap controller, power MOSFET and current sense resistor
in a single package for small form factor applications.
The LTC4219 provides separate inrush current control
and a 10% accurate 5.6A current limit with foldback cur-
rent limiting. The current limit threshold can be adjusted
dynamically using an external pin. Additional features
include a current monitor output that amplifies the sense
resistor voltage for ground referenced current sensing
and a MOSFET temperature monitor output. Thermal limit
and power good monitoring are also provided. The power
good detection level and foldback current limit profile are
internally preset for 5V (LTC4219-5) and 12V (LTC4219-12)
applications.
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.
Small Footprint
33mΩ MOSFET with R
SENSE
Available in Preset 12V and 5V Versions
Adjustable, 10% Accurate Current Limit
Current and Temperature Monitor Outputs
Overtemperature Protection
Adjustable Current Limit Timer Before Fault
Power Good and Fault Outputs
Adjustable Inrush Current Control
Available in 16-Lead 5mm
×
3mm DFN Packages
APPLICATIONS
n
n
n
RAID Systems
Server I/O Cards
Industrial
TYPICAL APPLICATION
12V, 5A Card Resident Application
12V
V
DD
OUT
12V
LTC4219DHC-12
10k
EN1
EN2
TIMER
INTV
CC
0.1μF
GND
PG
10k
FLT
I
SET
I
MON
20k
ADC
4219 TA01a
Power-Up Waveforms
+
330μF
12V
V
OUT
12V
5A
V
IN
10V/DIV
I
IN
0.1A/DIV
V
OUT
10V/DIV
PG
10V/DIV
20ms/DIV
4219 TA01b
4219f
1
LTC4219
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
DD
EN1
EN2
TIMER
INTV
CC
GND
OUT
OUT
1
2
3
4
5
6
7
8
17
SENSE
16 V
DD
15 I
SET
14 I
MON
13 FB
12
FLT
11
PG
10 GATE
9
OUT
Supply Voltage (V
DD
) ................................. –0.3V to 28V
Input Voltages
FB,
EN1, EN2
......................................... –0.3V to 12V
TIMER................................................... –0.3V to 3.5V
SENSE .............................V
DD
– 10V or – 0.3V to V
DD
Output Voltages
I
SET
, I
MON
................................................. –0.3V to 3V
PG, FLT
.................................................. –0.3V to 35V
OUT ............................................ –0.3V to V
DD
+ 0.3V
INTV
CC
.................................................. –0.3V to 3.5V
GATE (Note 3) ........................................ –0.3V to 33V
Operating Temperature Range
LTC4219C ................................................ 0°C to 70°C
LTC4219I.............................................. –40°C to 85°C
Junction Temperature (Notes 4, 5)........................ 125°C
Storage Temperature Range................... –65°C to 150°C
DHC PACKAGE
16-LEAD (5mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
θ
JA
= 43°C/W EXPOSED PAD SOLDERED, OTHERWISE
θ
JA
= 140°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC4219CDHC-12#PBF
LTC4219IDHC-12#PBF
LTC4219CDHC-5#PBF
LTC4219IDHC-5#PBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
LTC4219CDHC-12#TRPBF 421912
LTC4219IDHC-12#TRPBF 421912
LTC4219CDHC-5#TRPBF
LTC4219IDHC-5#TRPBF
42195
42195
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
4219f
2
LTC4219
ELECTRICAL CHARACTERISTICS
SYMBOL
V
DD
I
DD
V
DD(UVL)
V
OUT(PGTH)
ΔV
OUT(PGHYST)
I
OUT
PARAMETER
Input Supply Range
Input Supply Current
Input Supply Undervoltage Lockout
Output Power Good Threshold
Output Power Good Hysteresis
OUT Pin Leakage Current
MOSFET On, No Load
V
DD
Rising
LTC4219-12, V
OUT
Rising
LTC4219-5, V
OUT
Rising
LTC4219-12
LTC4219-5
V
OUT
= V
GATE
= 0V, V
DD
= 15V
V
OUT
= V
GATE
= 12V, LTC4219-12
V
OUT
= V
GATE
= 5V, LTC4219-5
ΔV
GATE
/Δt
R
ON
I
LIM(TH)
GATE Pin Turn-On Ramp Rate
MOSFET + Sense Resistor On Resistance
Current Limit Threshold
V
FB
= 1.23V
V
FB
= 0V
V
FB
= 1.23V, R
SET
= 20kΩ
Inputs
I
IN
R
FB
V
TH
ΔV
EN(HYST)
ΔV
FB(HYST)
R
ISET
Outputs
V
INTVCC
V
OL
I
OH
V
TIMER(H)
V
TIMER(L)
I
TIMER(UP)
I
TIMER(DN)
I
TIMER(RATIO)
A
IMON
I
OFF(IMON)
I
GATE(UP)
I
GATE(DN)
I
GATE(FST)
INTV
CC
Output Voltage
PG,
FLT
Pin Output Low Voltage
PG,
FLT
Pin Input Leakage Current
TIMER Pin High Threshold
TIMER Pin Low Threshold
TIMER Pin Pull-Up Current
TIMER Pin Pull-Down Current
TIMER Pin Current Ratio I
TIMER(DN)
/I
TIMER(UP)
I
MON
Pin Current Gain
I
MON
Pin Offset Current
Gate Pull-Up Current
Gate Pull-Down Current
Gate Fast Pull-Down Current
I
OUT
= 5A
I
OUT
= 330mA
Gate Drive On, V
GATE
= V
OUT
= 12V
Gate Drive Off, V
GATE
= 18V, V
OUT
= 12V
Fast Turn Off, V
GATE
= 18V, V
OUT
= 12V
V
DD
= 5V, 15V
I
LOAD
= 0mA, –10mA
I
OUT
= 2mA
V
OUT
= 30V
V
TIMER
Rising
V
TIMER
Falling
V
TIMER
= 0V
V
TIMER
= 1.2V
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
CONDITIONS
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
2.9
TYP
MAX
15
UNITS
V
mA
V
V
V
mV
mV
μA
μA
μA
V/ms
mΩ
A
A
A
μA
kΩ
kΩ
V
mV
mV
kΩ
V
V
μA
V
V
μA
μA
%
μA/A
μA
μA
μA
mA
DC Characteristics
1.6
2.65
10.2
4.2
127
53
50
26
0.15
15
5.0
1.2
2.6
2.73
10.5
4.35
170
71
0
70
36
0.3
33
5.6
1.5
2.9
0
13
20
1.21
50
10
19
2.8
18
29
1.235
80
20
20
3.0
0.4
0
1.2
0.1
–80
1.4
1.6
18.5
–19
190
1.235
0.21
–100
2
2
20
0
–24
250
140
3
2.85
10.8
4.5
213
89
±150
90
46.5
0.55
50
6.1
1.8
3.3
±1
23
37
1.26
110
30
21
3.2
0.8
±10
1.28
0.3
–120
2.6
2.7
21.5
±4.5
–29
340
EN1, EN2
Pin Input Current
FB Pin Input Resistance
EN1, EN2,
FB Pin Threshold Voltage
EN1, EN2
Pin Hysteresis
FB Pin Power Good Hysteresis
I
SET
Pin Output Resistor
V
IN
= 1.2V
LTC4219-12
LTC4219-5
V
IN
Rising
4219f
3
LTC4219
ELECTRICAL CHARACTERISTICS
SYMBOL
t
PHL(GATE)
t
PHL(ILIM)
t
D(ON)
t
D(CB)
PARAMETER
Input High (EN1,
EN2)
to Gate Low
Propagation Delay
Short Circuit to Gate Low
Turn-On Delay
Circuit Breaker Filter Delay Time (Internal)
AC Characteristics
V
GATE
< 16.5V Falling
V
FB
= 0, Step I
SENSE
to 3A,
V
GATE
< 16.5V Falling
Step V
EN1
and V
EN2
to 0V, V
GATE
> 13V
V
FB
= 0V, Step I
SENSE
to 3A
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
CONDITIONS
MIN
TYP
8
1
50
1.5
100
2
MAX
10
5
150
2.7
UNITS
μs
μs
ms
ms
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 pins are positive, all voltages are referenced to
GND unless otherwise specified.
Note 3:
An internal clamp limits the GATE pin to a maximum of 6.5V
above OUT. Driving this pin to voltages beyond the clamp may damage the
device.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
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Embedded System
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