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LTC4229IUFD#PBF

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LTC4229
1
4229f
For more information www.linear.com/LTC4229
Typical applicaTion
FeaTures DescripTion
Ideal Diode and
Hot Swap Controller
The LT C
®
4229 offers ideal diode and Hot Swap™ functions
for a power rail by controlling two external N-channel MOS-
FETs. The
MOSFET
acting as an ideal diode replaces a high
power Schottky diode and the associated heat sink, saving
power and board area. The Hot Swap MOSFET control al
-
lows a board 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
foldback current limit and electronic circuit breaker.
The LTC4229 regulates the forward voltage drop across
the external MOSFET to ensure smooth current transfer
in diode-OR applications. The ideal diode turns on quickly
to reduce the load voltage droop during supply switcho
-
ver. If
the input supply fails or is shorted, a fast turn-off
minimizes reverse-current transients.
The
LTC4229 provides adjustable start-up delay, under
-
voltage and overvoltage protection, and reports fault and
power good status for the supply. It can be configured
for latch off or automatic retry after a fault.
L, LT , LT C , LT M , 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.
Protected by U.S. Patents, including 7920013, 8022679.
Plug-In Supply Card Application
applicaTions
n
Ideal Diode and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diode
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 Back-to-Back N-Channel MOSFETs
n
Limits Peak Fault Current in ≤1µs
n
Adjustable Current Limit with Foldback
n
Adjustable Start-Up and Current Limit Fault Delay
n
0.5µs Ideal Diode Turn-On and Turn-Off Time
n
Undervoltage and Overvoltage Protection
n
Status, Fault and Power Good Outputs
n
Pin Selectable Latch Off or Automatic Retry
After Fault
n
24-Lead 4mm × 5mm QFN and SSOP Packages
n
Redundant Power Supplies
n
Supply Holdup
n
High Availability Systems and Servers
n
Telecom and Network Infrastructure
n
Power Prioritizer
Diode FET Protects Output
Voltage from Input Brownout
DCFGDOFF
EN
4229 TA01a
DFLT
GND INTV
CC
FB
SENSE
+
SENSE
–
UV
OV
DSTAT
RTMR
FAULT
PWRGD
DTMR FTMR
CPO DSRC HGATEIN DSNS
BACKPLANE
OUT
10Ω 1k
680µF
10nF
12V
V
OUT
7.6A
HOT SWAP FET
SiR818DP
PLUG-IN
SUPPLY
CARD
DGATE
DIODE FET
SiR818DP
0.0025Ω
21.5k
1.1k
2k
+
0.1µF
0.1µF
0.1µF
15k
2k
LTC4229
50µs/DIV
IN
10V/DIV
OUT
10V/DIV
DGATE
20V/DIV
HGATE
20V/DIV
4229 TA01b
LTC4229
2
4229f
For more information www.linear.com/LTC4229
absoluTe MaxiMuM raTings
Supply Voltages
IN
........................................................... –0.3V to 24V
INTV
CC
..................................................... –0.3V to 7V
Input Voltages
FB,
D
CFG ................................................. –0.3V to 7V
FTMR, DT
MR, RTMR ............. –0.3V to INTV
CC
+ 0.3V
UV, O
V, EN, DOFF ................................... –0.3V to 24V
SENSE
+
, SENSE
–
, DSNS, DSRC ............. –0.3V to 24V
Output Voltages
FAU LT,
P
WRGD, DSTAT, D FLT, OUT ........ –0.3V to 24V
CPO, D
GATE (Note 3) ............................. –0.3V to 35V
HGATE (Note 4)
..................................... –0.3V to 35V
Average Currents
FAU LT,
P
WRGD, DSTAT, D FLT ...............................5mA
INTV
CC
................................................................. 1mA
Operating Ambient Temperature Range
LTC42
29C
................................................ 0°C to 70°C
LTC4229I
.............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
G Package .........................................................300°C
(Notes 1, 2)
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4229CUFD#PBF LTC4229CUFD#TRPBF 4229 24-Lead (4mm × 5mm) Plastic QFN 0°C to 70°C
LTC4229IUFD#PBF LTC4229IUFD#TRPBF 4229 24-Lead (4mm × 5mm) Plastic QFN –40°C to 85°C
LTC4229CG#PBF LTC4229CG#TRPBF LTC4229G 24-Lead Plastic SSOP 0°C to 70°C
LTC4229IG#PBF LTC4229IG#TRPBF LTC4229G 24-Lead Plastic SSOP –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LT C
Marketing for information on nonstandard 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/
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
DSRC
SENSE
–
SENSE
+
IN
DSNS
INTV
CC
GND
PWRGD
FAULT
DSTAT
DFLT
DOFF
DCFG
OV
DGATE
CPO
HGATE
OUT
FB
DTMR
RTMR
FTMR
EN
UV
7
14
15
16
17
18
19
13
T
JMAX
= 125°C, θ
JA
= 43°C/W (Note 5)
EXPOSED PAD (PIN 25) PCB GND CONNECTION OP
TIONAL
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
G PACKAGE
24-LEAD PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
CPO
DGATE
DSRC
SENSE
–
SENSE
+
IN
DSNS
INTV
CC
GND
DTMR
RTMR
FTMR
HGATE
OUT
FB
PWRGD
FAULT
DSTAT
DFLT
DOFF
DCFG
OV
UV
EN
T
JMAX
= 125°C, θ
JA
= 88°C/W
pin conFiguraTion
LTC4229
3
4229f
For more information www.linear.com/LTC4229
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 4 mA
V
INTVCC
Internal Regulator Voltage I = 0, –500µA
l
4.5 5 5.5 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
IN
– V
DSNS
)
l
35 50 65 mV
∆V
DGATE
External N-Channel Gate Drive
(V
DGATE
– V
DSRC
)
IN < 7V, ∆V
FWD
= 0.15V; I = 0, –1µA
IN = 7V to 18V, ∆V
FWD
= 0.15V; I = 0, –1µA
l
l
5
10
7
12
14
14
V
V
∆V
DGATE(ST)
Diode MOSFET On Detect Threshold
(V
DGATE
– V
DSRC
)
DSTAT Pulls Low, ∆V
FWD
= 75mV
l
0.3 0.7 1.1 V
∆V
FWD(F LT )
Open Diode MOSFET Threshold (V
IN
– V
DSNS
) DFLT Pulls Low
l
200 250 300 mV
I
DSNS
DSNS Pin Current DSNS = 12V
l
50 150 300 µA
I
DSRC
DSRC Pin Current DSRC = 0V
l
–95 –150 µA
I
CPO(UP)
CPO Pull-Up Current CPO = DSRC = IN = 2.9V
CPO = DSRC = IN = 18V
l
l
–70
–60
–105
–95
–130
–120
µA
µA
I
DGATE(FPU)
DGATE Fast Pull-Up Current ∆V
FWD
= 0.2V, ∆V
DGATE
= 0V, CPO = 17V –1.5 A
I
DGATE(FPD)
DGATE Fast Pull-Down Current ∆V
FWD
= –0.2V, ∆V
DGATE
= 5V 1.5 A
I
DGATE(DN)
DGATE Off Pull-Down Current DOFF = 2V, ∆V
DGATE
= 2.5V
l
50 100 200 µA
t
ON(DGATE)
DGATE Turn-On Delay ∆V
FWD
= 0.2V , C
DGATE
= 10nF
l
0.25 0.5 µs
t
OFF(DGATE)
DGATE Turn-Off Delay ∆V
FWD
= –0.2V, C
DGATE
= 10nF
l
0.2 0.5 µs
t
PLH(DGATE)
DOFF Low to DGATE High
l
50 100 µs
Hot Swap Control
∆V
SENSE(TH)
Current Limit Sense Voltage Threshold
(V
SENSE
+
– V
SENSE
–
)
FB = 1.23V
FB = 0V
l
l
22.5
6
25
8.3
27.5
10.6
mV
mV
V
SENSE
+
(UVL)
SENSE
+
Undervoltage Lockout SENSE
+
Rising
l
1.8 1.9 2 V
∆V
SENSE
+
(HYST)
SENSE
+
Undervoltage Lockout Hysteresis
l
10 50 90 mV
I
SENSE
+
SENSE
+
Pin Current SENSE
+
= 11V, IN = 12V, OUT = 0V
SENSE
+
= 13V, IN = 12V, OUT = 0V
l
l
150 300
2
450
4
µA
mA
I
SENSE
–
SENSE
–
Pin Current SENSE
–
= 12V
l
10 40 100 µA
∆V
HGATE
External N-Channel Gate Drive
(V
HGATE
– V
OUT
)
IN < 7V; I = 0, –1µA
IN = 7V to 18V; I = 0, –1µA
l
l
5
10
7
12
14
14
V
V
∆V
HGATE(H)
Gate High Threshold (V
HGATE
– V
OUT
)
l
3.6 4.2 4.8 V
I
HGATE(UP)
External N-Channel Gate Pull-Up Current Gate Drive On, HGATE = 0V
l
–7 –10 –13 µA
I
HGATE(DN)
External N-Channel Gate Pull-Down Current Gate Drive Off, OUT = 12V,
HGATE = OUT + 5V
l
1 2 4 mA
I
HGATE(FPD)
External N-Channel Gate Fast
Pull-Down Current
Fast T
urn-Off, OUT = 12V,
HGATE = OUT + 5V
l
100 200 350 mA
t
PHL(SENSE)
Sense Voltage (SENSE
+
– SENSE
–
)
High to HGATE Low
∆V
SENSE
= 200mV, C
HGATE
= 10nF
l
0.5 1 µs
t
OFF(HGATE)
OV High to HGATE Low
UV Low to HGATE Low
EN High to HGATE Low
SENSE
+
Low to HGATE Low
l
l
l
l
10
10
20
10
20
20
40
20
µs
µs
µs
µs
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LTC4229IUFD#PBF

Mfr. #:
Buy LTC4229IUFD#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Ideal Diode & Hot Swap Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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