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LTC4225CGN-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC4225-1/LTC4225-2
1
422512f
Typical applicaTion
FeaTures DescripTion
Dual Ideal Diode and
Hot Swap Controller
The LTC
®
4225 offers ideal diode and Hot Swap™ functions
for two power rails by controlling external series connected
N-channel MOSFETs. MOSFETs acting as ideal diodes
replace two high power Schottky diodes and the associ-
ated heat sinks, saving power and board area. Hot Swap
control MOSFETs allow boards to be safely inserted and
removed from a live backplane by limiting inrush current.
The supply output is also protected against short-circuit
faults with a fast acting current limit and internal timed
circuit breaker.
The LTC4225 regulates the forward voltage drop across
the back-to-back MOSFETs to ensure smooth current
transfer from one supply to the other without oscillation.
The ideal diodes turn on quickly to reduce the load voltage
droop during supply switch-over. If the input supply fails
or is shorted, a fast turn-off minimizes reverse-current
transients.
The LTC4225 allows independent on/off control, and reports
fault and power good status for the supply. The LTC4225-1
features a latch-off circuit breaker, while the LTC4225-2
provides automatic retry after a fault.
µTCA Application
applicaTions
n
Power Path and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diodes
n
Allows Safe Hot Swapping from a Live Backplane
n
2.9V to 18V Operating Range
n
Controls N-Channel MOSFETs
n
Limits Peak Fault Current in ≤1µs
n
0.5µs Turn-On and Reverse Turn-Off Time
n
Adjustable Current Limit with Circuit Breaker
n
Smooth Switchover without Oscillation
n
Adjustable Current Limit Fault Delay
n
Fault and Power Status Output
n
LTC4225-1: Latch Off After Fault
n
LTC4225-2: Automatic Retry After Fault
n
24-Lead 4mm × 5mm QFN and SSOP Packages
n
Redundant Power Supplies
n
Supply Holdup
n
MicroTCA Systems and Servers
n
Telecom Networks
n
Power Prioritizer
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
CPO1
ON1
137k
12V
12V
ON2
INTV
CC
GND
0.1µF
0.1µF
0.1µF
47nF 47nF
12V
7.6A
PLUG-IN
CARD 1
PLUG-IN
CARD 2
BACKPLANE
422512 TA01a
IN1 SENSE1 DGATE1
Si7336ADP
LTC4225
0.004Ω
Si7336ADP
Si7336ADP
0.004Ω
Si7336ADP
HGATE1 OUT1
CPO2 IN2 SENSE2 DGATE2 HGATE2 OUT2
FAULT1
PWRGD1
EN1
TMR1
TMR2
EN2
PWRGD2
FAULT2
20k
20k
137k
12V
7.6A
Power Dissipation vs Load Current
LOAD CURRENT (A)
0
0
POWER DISSIPATION (W)
0.5
1.0
1.5
2.0
2.5
3.0
2 4 6 8
422512 TA01
DIODE
(SBG1025L)
MOSFET
(Si7336ADP)
POWER SAVED
LTC4225-1/LTC4225-2
2
422512f
absoluTe MaxiMuM raTings
Supply Voltages
IN1, IN2 .................................................. –0.3V to 24V
INTV
CC
..................................................... –0.3V to 7V
Input Voltages
ON1, ON2, EN1, EN2............................... –0.3V to 24V
TMR1, TMR2 .........................–0.3V to INTV
CC
+ 0.3V
SENSE1, SENSE2 ................................... –0.3V to 24V
Output Voltages
FA U LT1, FAU LT2 , PWRGD1, PWRGD2 ..... –0.3V to 24V
CPO1, CPO2 (Note 3) ............................. –0.3V to 35V
DGATE1, DGATE2 (Note 3) ..................... –0.3V to 35V
HGATE1, HGATE2 (Note 4) ..................... –0.3V to 35V
OUT1, OUT2 ........................................... –0.3V to 24V
(Notes 1, 2)
8 9
TOP VIEW
25
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
10 11 12
24 23 22 21 20
6
5
4
3
2
1
SENSE1
IN1
INTV
CC
GND
ON2
IN2
SENSE2
FAULT1
ON1
EN1
TMR1
TMR2
EN2
FAULT2
DGATE1
CPO1
HGATE1
OUT1
PWRGD1
DGATE2
CPO2
HGATE2
OUT2
PWRGD2
7
14
15
16
17
18
19
13
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 25) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD PLASTIC SSOP NARROW
24
23
22
21
20
19
18
17
16
15
14
13
CPO1
DGATE1
SENSE1
IN1
ON1
INTV
CC
GND
ON2
IN2
SENSE2
DGATE2
CPO2
HGATE1
OUT1
PWRGD1
FAULT1
EN1
TMR1
TMR2
EN2
FAULT2
PWRGD2
OUT2
HGATE2
T
JMAX
= 125°C, θ
JA
= 85°C/W
pin conFiguraTion
Average Currents
FA U LT1, FAU LT2 , PWRGD1, PWRGD2 ................... 5mA
INTV
CC
................................................................. 1mA
Operating Temperature Range
LTC4225C ................................................ 0°C to 70°C
LTC4225I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package ...................................................... 300°C
LTC4225-1/LTC4225-2
3
422512f
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4225CUFD-1#PBF LTC4225CUFD-1#TRPBF 42251
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4225CUFD-2#PBF LTC4225CUFD-2#TRPBF 42252
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4225IUFD-1#PBF LTC4225IUFD-1#TRPBF 42251
24-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4225IUFD-2#PBF LTC4225IUFD-2#TRPBF 42252
24-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4225CGN-1#PBF LTC4225CGN-1#TRPBF LTC4225GN-1 24-Lead Plastic SSOP 0°C to 70°C
LTC4225CGN-2#PBF LTC4225CGN-2#TRPBF LTC4225GN-2 24-Lead Plastic SSOP 0°C to 70°C
LTC4225IGN-1#PBF LTC4225IGN-1#TRPBF LTC4225GN-1 24-Lead Plastic SSOP –40°C to 85°C
LTC4225IGN-2#PBF LTC4225IGN-2#TRPBF LTC4225GN-2 24-Lead Plastic SSOP –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.
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/
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
IN
Input Supply Range
l
2.9 18 V
I
IN
Input Supply Current
l
2.8 5 mA
V
IN(UVL)
Input Supply Undervoltage Lockout IN Rising
l
1.75 1.9 2.05 V
∆V
IN(HYST)
Input Supply Undervoltage Lockout
Hysteresis
l
10 50 90 mV
V
INTVCC
Internal Regulator Voltage
l
4.5 5 5.6 V
V
INTVCC(UVL)
Internal V
CC
Undervoltage Lockout INTV
CC
Rising
l
2.1 2.2 2.3 V
∆V
INTVCC(HYST)
Internal V
CC
Undervoltage Lockout
Hysteresis
l
30 60 90 mV
Ideal Diode Control
∆V
FWD(REG)
Forward Regulation Voltage
(V
INn
– V
OUTn
)
l
10 25 40 mV
∆V
DGATE
External N-Channel Gate Drive
(V
DGATEn
– V
INn
)
IN < 7V, ∆V
FWD
= 0.1V, I = 0, –1µA
IN = 7V to 18V, ∆V
FWD
= 0.1V, I = 0, –1µA
l
l
5
10
7
12
14
14
V
V
I
CPO(UP)
CPOn Pull-Up Current CPO = IN = 2.9V
CPO = IN = 18V
l
l
–60
–50
–95
–85
–120
–110
µA
µA
I
DGATE(FPU)
DGATEn Fast Pull-Up Current
∆V
FWD
= 0.2V, ∆V
DGATE
= 0V, CPO = 17V
–1.5 A
I
DGATE(FPD)
DGATEn Fast Pull-Down Current
∆V
FWD
= –0.2V, ∆V
DGATE
= 5V
1.5 A
t
ON(DGATE)
DGATEn Turn-On Delay
∆V
FWD
= 0.2V, C
DGATE
= 10nF
l
0.25 0.5 µs
t
OFF(DGATE)
DGATEn Turn-Off Delay
∆V
FWD
= –0.2V, C
DGATE
= 10nF
l
0.2 0.5 µs
Hot Swap Control
∆V
SENSE(CB)
Circuit Breaker Trip Sense Voltage
(V
INn
– V
SENSEn
)
l
47.5 50 52.5 mV
∆V
SENSE(ACL)
Active Current Limit Sense Voltage
(V
INn
– V
SENSEn
)
l
55 65 75 mV
∆V
HGATE
External N-Channel Gate Drive
(V
HGATEn
– V
OUTn
)
IN < 7V, I = 0, –1µA
IN = 7V to 18V, I = 0, –1µA
l
l
4.8
10
7
12
14
14
V
V
∆V
HGATE(PG)
Gate-Source Voltage for Power Good
l
3.6 4.2 4.8 V
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LTC4225CGN-1#TRPBF

Mfr. #:
Buy LTC4225CGN-1#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Dual Ideal Diode and Hot Swap Controller with LatchOff
Lifecycle:
New from this manufacturer.
Delivery:
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