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LTC4228IGN-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC4228-1/LTC4228-2
1
422812f
CPO1
ON1
137k
12V
12V
ON2
INTV
CC
GND
0.1µF
0.1µF
0.1µF
47nF
47nF
IN1 SENSE1
–
SENSE1
+
DGATE1
Si7336ADP
LTC4228
0.004Ω
Si7336ADP
Si7336ADP
0.004Ω
Si7336ADP
HGATE1 OUT1
CPO2 IN2 SENSE2
–
SENSE2
+
DGATE2 HGATE2 OUT2
STATUS1
FAULT1
PWRGD1
EN1
EN2
PWRGD2
FAULT2
STATUS2
20k
20k
137k
12V
7.6A
PLUG-IN
CARD 1
PLUG-IN
CARD 2
BACKPLANE
422812 TA01a
12V
7.6A
TMR1
TMR2
I
IN2
2A/DIV
I
IN1
2A/DIV
IN2
1V/DIV
IN1
1V/DIV
200ms/DIV
422512 TA01b
Typical applicaTion
FeaTures DescripTion
Dual Ideal Diode and
Hot Swap Controller
The LTC
®
4228 offers ideal diode and Hot Swap™ functions
for two power rails by controlling two external N-channel
MOSFETs in each rail. MOSFETs acting as ideal diodes re-
place two high power Schottky diodes and the associated
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 LTC4228 regulates the forward voltage drop across
the external MOSFETs and sense resistor 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 LTC4228 allows independent on/off control, and reports
fault and power good status for the supply. The LTC4228
improves on the LTC4225 by recovering more quickly from
input brownouts to preserve the output voltage.
µTCA Application
applicaTions
n
Power Path and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diodes
n
Protects Output Voltage from Input Brownouts
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
Adjustable Current Limit with Circuit Breaker
n
Adjustable Current Limit Fault Delay
n
Smooth Switchover without Oscillation
n
0.5µs Ideal Diode Turn-On and Turn-Off Time
n
Status, Fault and Power Good Outputs
n
LTC4228-1: Latch Off After Fault
n
LTC4228-2: Automatic Retry After Fault
n
28-Lead 4mm × 5mm QFN and SSOP Packages
n
Redundant Power Supplies
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.
Smooth Supply Switchover
LTC4228-1/LTC4228-2
2
422812f
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
SENSE1
–
, SENSE2
–
................................ –0.3V to 24V
Output Voltages
FA U LT1, FAU LT2 , PWRGD1, PWRGD2 ..... –0.3V to 24V
STATUS1, STATUS2 ................................ –0.3V to 24V
CPO1, CPO2 (Note 3) ............................. –0.3V to 35V
DGATE1, DGATE2 (Note 3) ..................... –0.3V to 35V
(Notes 1, 2)
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28
29
27 26 25 24
14
23
6
5
4
3
2
1
SENSE1
–
SENSE1
+
IN1
INTV
CC
GND
IN2
SENSE2
+
SENSE2
–
FAULT1
ON1
EN1
TMR1
TMR2
EN2
ON2
FAULT2
DGATE1
CPO1
STATUS1
HGATE1
OUT1
PWRGD1
DGATE2
CPO2
STATUS2
HGATE2
OUT2
PWRGD2
7
17
18
19
20
21
22
16
8
15
T
JMAX
= 125°C, θ
JA
= 43°C/W (NOTE 5)
EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP NARROW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
STATUS1
CPO1
DGATE1
SENSE1
–
SENSE1
+
IN1
INTV
CC
GND
IN2
SENSE2
+
SENSE2
–
DGATE2
CPO2
STATUS2
HGATE1
OUT1
PWRGD1
FAULT1
ON1
EN1
TMR1
TMR2
EN2
ON2
FAULT2
PWRGD2
OUT2
HGATE2
T
JMAX
= 125°C, θ
JA
= 80°C/W
pin conFiguraTion
HGATE1, HGATE2 (Note 4) ..................... –0.3V to 35V
OUT1, OUT2 ........................................... –0.3V to 24V
Average Currents
FA U LT1, FAU LT2 , PWRGD1, PWRGD2 ................... 5mA
STATUS1, STATUS2 ..............................................5mA
INTV
CC
................................................................. 1mA
Operating Temperature Range
LTC4228C ................................................ 0°C to 70°C
LTC4228I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package ...................................................... 300°C
LTC4228-1/LTC4228-2
3
422812f
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4228CUFD-1#PBF LTC4228CUFD-1#TRPBF 42281
28-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4228CUFD-2#PBF LTC4228CUFD-2#TRPBF 42282
28-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4228IUFD-1#PBF LTC4228IUFD-1#TRPBF 42281
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4228IUFD-2#PBF LTC4228IUFD-2#TRPBF 42282
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4228CGN-1#PBF LTC4228CGN-1#TRPBF LTC4228GN-1 28-Lead Plastic SSOP 0°C to 70°C
LTC4228CGN-2#PBF LTC4228CGN-2#TRPBF LTC4228GN-2 28-Lead Plastic SSOP 0°C to 70°C
LTC4228IGN-1#PBF LTC4228IGN-1#TRPBF LTC4228GN-1 28-Lead Plastic SSOP –40°C to 85°C
LTC4228IGN-2#PBF LTC4228IGN-2#TRPBF LTC4228GN-2 28-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
2.5 5 mA
V
INTVCC
Internal Regulator Voltage I = 0, –500µA
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
∆V
DGATE(ST)
Diode MOSFET On Detect Threshold
STATUS Pulls Low, ∆V
FWD
= 50mV
l
0.3 0.7 1.1 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
SENSEn
+
– V
SENSEn
–
)
l
47.5 50 52.5 mV
∆V
SENSE(ACL)
Active Current Limit Sense Voltage
(V
SENSEn
+
– V
SENSEn
–
)
l
55 65 75 mV
V
SENSE
+
(UVL)
SENSEn
+
Undervoltage Lockout SENSE
+
Rising
l
1.75 1.9 2.05 V
∆V
SENSE
+
(HYST)
SENSEn
+
Undervoltage Lockout Hysteresis
l
10 50 90 mV
I
SENSE
+
SENSEn
+
Input Current SENSE
+
= 12V
l
150 350 500 µA
I
SENSE
–
SENSEn
–
Input Current SENSE
–
= 12V
l
10 50 100 µA
∆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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LTC4228IGN-1#TRPBF

Mfr. #:
Buy LTC4228IGN-1#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers 2x Ideal Diode & Hot Swap Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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