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LTC4244IGN-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
1
LTC4244/LTC4244-1
42441f
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
■
Controls –12V, 3.3V, 5V and 12V Supplies
■
±14.4V Absolute Maximum Rating for 12V
IN
and –12V
IN
Input Pins
■
Insensitive to Supply Voltage Transients
■
Adjustable Foldback Current Limit with Circuit Breaker
■
LOCAL_PCI_RST# Logic On-Chip
■
PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
■
LTC4244-1 Designed for Applications without –12V
■
Available in 20-Lead Narrow SSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
■ Hot Board Insertion into CompactPCI Bus
The LTC
®
4244/LTC4244-1 are Hot Swap
TM
controllers that
allow a board to be safely inserted into and removed from
a CompactPCI
TM
bus slot. External N-channel transistors
control the 5V and 3.3V supplies while on-chip switches
control the ±12V supplies. The 3.3V and 5V supplies can
be ramped up at an adjustable rate. Electronic circuit
breakers protect all four supplies against overcurrent
faults. After the power-up cycle is complete, the TIMER pin
capacitor serves as auxiliary V
CC
allowing the LTC4244/
LTC4244-1 to function without interruption in the pres-
ence of voltage spikes on the 12V
IN
supply. The PWRGD
output indicates when all four supplies are within toler-
ance. The OFF/ON pin is used to cycle board power or reset
the circuit breaker. The PRECHARGE output can be used
to bias the bus I/O pins during card insertion and extrac-
tion. PCI_RST# is combined on-chip with HEALTHY# in
order to generate LOCAL_PCI_RST#.
3.3V
IN
12V
IN
12V
OUT
V
EEIN
OFF/ON
Z4
5V
IN
R4
10Ω
C
LOAD(5VOUT)
V
OUT
5V
5A
V
OUT
3.3V
7A
R5
1k
C1
0.33µF
R3
10Ω
R1
0.005Ω
R2
0.007Ω
Q1
IRF7457
Q2
IRF7457
3.3V
OUT
3.3V
SENSE
GND PRECHARGE
5V
IN
5V
SENSE
DRIVE
R9 24Ω
1V
±10%
Q3
MMBT2222A
C3 4.7nF
V
IN
3.3V
4244 F01
LTC4244
GATE 5V
OUT
+
C
LOAD(3.3VOUT)
+
V
OUT
12V
500mA
C
LOAD(12VOUT)
+
V
EEOUT
TIMER
RESETOUT
I/O #1
I/O #128
V
EEOUT
–12V
100mA
V
OUT
3.3V
C
LOAD(VEEOUT)
C2
0.082µF
+
Z3
Z2Z1
R17
10k
3.3V
IN
R22
2.7Ω
C9
0.01µF PER
POWER PIN
C7
0.01µF
C8
0.01µF PER
POWER PIN
R21
1.8Ω
R19 1k
FAULT
PWRGD
RESETIN
R18 10k
R20
1.2k
R16
1Ω
C6
0.01µF
R8 1k
R7 12Ω
R6
10k
R10 18Ω
R11
10k
R13
10Ω
R14
10Ω
•
•
•
•
•
•
•
•
•
R12
10k
C5
0.01µF
R15
1Ω
C4
0.01µF
I/O DATA LINE 1
I/O DATA LINE 128
Z1, Z2: SMAJ12A Z3, Z4: SMAJ5.0A
I/O PIN 128
RESET#
PCI
BRIDGE
CHIP
I/O PIN 1
GROUND
PCI_RST#
LOCAL_PCI_RST#
HEALTHY#
LONG V(I/O)
BD_SEL#
–12V
12V
LONG 3.3V
LONG 5V
3.3V
5V
Figure 1. Typical Compact PCI Application
Hot Swap is a trademark of Linear Technology Corporation.
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
Rugged, CompactPCI Bus
Hot Swap Controllers
2
LTC4244/LTC4244-1
42441f
GN PACKAGE
20-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
12V
IN
V
EEIN
5V
OUT
TIMER
OFF/ON
FAULT
PWRGD
GND
RESETIN
RESETOUT
12V
OUT
V
EEOUT
3.3V
OUT
3.3V
IN
3.3V
SENSE
GATE
5V
SENSE
5V
IN
PRECHARGE
DRIVE
(Notes 1, 2, 3)
Supply Voltages
12V
IN
................................................................ 14.4V
V
EEIN
.............................................................. –14.4V
Input Voltages (OFF/ON, RESETIN) ........–0.3V to 13.5V
Output Voltages (FAULT, PWRGD, RESETOUT)
...........................................................–0.3V to 13.5V
Analog Voltages and Currents
5V
OUT
, DRIVE, 5V
IN
, 3.3V
SENSE
, 3.3V
IN
, 3.3V
OUT
, 5V
SENSE
...........................................................–0.3V to 13.5V
PRECHARGE, GATE ....................................... ±20mA
V
EEOUT
................................................–14.4V to 0.3V
TIMER, 12V
OUT
...........................................
–0.3V to 14.4V
Operation Temperature Range
LTC4244C/LTC4244C-1........................... 0°C to 70°C
LTC4244I/LTC4244I-1 ........................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC4244CGN
LTC4244CGN-1
LTC4244IGN
LTC4244IGN-1
T
JMAX
= 140°C, θ
JA
= 135°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DD
V
12VIN
Supply Current OFF/ON = 0V ● 410 mA
V
LKO
Undervoltage Lockout 12V
IN
, Ramping Down ● 8 9 10 V
5V
IN
, Ramping Down ● 4 4.25 4.5 V
3.3V
IN
, Ramping Down ● 2.25 2.5 2.75 V
V
EEIN
, Ramping Up (LTC4244 Only) ● –8.25 –9.25 –10.25 V
TIMER, Ramping Down, V
12VIN
= 6V ● 8.25 9.25 10.25 V
V
FB
Foldback Current Limit Voltage V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V, TIMER = 0V ● 11 16 21 mV
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 3V, TIMER = 0V ● 46 51 56 mV
V
FB
= (V
3.3VIN
– V
3.3VSENSE
), V
3.3VOUT
= 0V, TIMER = 0V ● 11 16 21 mV
V
FB
= (V
3.3VIN
– V
3.3VSENSE
), V
3.3VOUT
= 2V, TIMER = 0V ● 46 51 56 mV
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
5VIN
– V
5VSENSE
), TIMER = FLOAT ● 45 52 57 mV
V
CB
= (V
3.3VIN
– V
3.3VSENSE
), TIMER = FLOAT ● 45 52 57 mV
t
OC
Overcurrent Fault Response Time (V
5VIN
– V
5VSENSE
) = 100mV, TIMER = FLOAT ● 17 25 35 µs
(V
3.3VIN
– V
3.3VSENSE
) = 100mV, TIMER = FLOAT ● 17 25 35 µs
I
GATE(UP)
GATE Pin Output Current OFF/ON = 0V, V
GATE
= 2V, TIMER = 0V ● –20 –67 –100 µA
I
GATE(DN)
V
GATE
= 5V, OFF/ON = 4V ● 20 60 100 µA
I
GATE(FAULT)
OFF/ON = 0V, V
GATE
= 2V, TIMER = FLOAT, FAULT = 0V ● 4 8 16 mA
∆V
GATE
External Gate Voltage ∆V
GATE
= (V
12VIN
– V
GATE
), I
GATE
= –1µA ● 0.6 1 V
∆V
12V
Internal Switch Voltage Drop ∆V
12V
= (V
12VIN
– V
12VOUT
), I = 500mA ● 225 600 mV
∆V
VEE
∆V
VEE
= (V
EEOUT
– V
EEIN
), I
EE
= 100mA ● 110 250 mV
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
12VIN
= 12V, V
EEIN
= –12V, V
3.3VIN
= 3.3V, V
5VIN
= 5V, unless
otherwise noted.
3
LTC4244/LTC4244-1
42441f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
CL
Current Foldback 12V
IN
= 12V, 12V
OUT
= 0V, TIMER = 0V ● –100 –360 –1000 mA
12V
IN
= 12V, 12V
OUT
= 10V, TIMER = 0V ● –550 –850 –1500 mA
V
EEIN
= –12V, V
EEOUT
= 0V, TIMER = 0V ● 50 225 350 mA
V
EEIN
= –12V, V
EEOUT
= –10V, TIMER = 0V ● 350 610 870 mA
T
TS
Thermal Shutdown Temperature Junction Temperature, Ramping Up 150 °C
V
TH
Power Good Threshold Voltage 12V
OUT
, Ramping Down ● 10.8 11.1 11.4 V
5V
OUT
, Ramping Down ● 4.50 4.61 4.75 V
3.3V
OUT
, Ramping Down ● 2.80 2.90 3.00 V
V
EEOUT
, Ramping Up, LTC4244 Only ● –10.8 –11.1 –11.4 V
V
IL
Logic Input Low Voltage OFF/ON, RESETIN, FAULT ● 0.8 V
V
IH
Logic Input High Voltage OFF/ON, RESETIN, FAULT ● 2V
I
IN
OFF/ON, RESETIN Input Current OFF/ON, RESETIN = 0V ● ±10 µA
OFF/ON, RESETIN = 12V
● ±10 µA
RESETOUT, FAULT Leakage RESETOUT, FAULT = 5V, OFF/ON = 0V, RESETIN = 3.3V ● ±10 µA
Current
PWRGD Output Current PWRGD = 5V, OFF/ON = 4V ● ±10 µA
5V
SENSE
Input Current 5V
SENSE
= 5V, 5V
OUT
= 0V ● 57 100 µA
3.3V
SENSE
Input Current 3.3V
SENSE
= 3.3V, 3.3V
OUT
= 0V ● 56 100 µA
5V
IN
Input Current 5V
IN
= 5V, TIMER = 0V ● 0.8 1.5 mA
3.3V
IN
Input Current 3.3V
IN
= 3.3V, TIMER = FLOAT ● 510 700 µA
3.3V
IN
= 3.3V, TIMER = 0V ● 400 550 µA
5V
OUT
Input Current 5V
OUT
= 5V, OFF/ON = 0V, TIMER = 0V ● 107 200 µA
3.3V
OUT
Input Current 3.3V
OUT
= 3.3V, OFF/ON = 0V, TIMER = 0V ● 170 300 µA
PRECHARGE Input Current V
PRECHARGE
= 1V ● 0.1 10 µA
I
TIMER
TIMER Pin Current OFF/ON = 0V, V
TIMER
= 0V ● 16 21 26 µA
OFF/ON = 5V, V
TIMER
= 5V ● 25 45 70 mA
V
TIMER
TIMER Threshold Voltage TIMER_HI, (V
12VIN
– V
TIMER
), FAULT = 0V, Ramping Up ● 1.3 1.6 1.9 V
TIMER_LO, V
TIMER
, Ramping Down ● 0.5 0.8 1.1 V
∆V
TIMER
External Timer Voltage ∆V
TIMER
= (V
12VIN
– V
TIMER
), I
TIMER
= –1µA ● 1V
R
DIS
12V
OUT
Discharge Resistance OFF/ON = 4V ● 440 1000 Ω
5V
OUT
Discharge Resistance OFF/ON = 4V ● 200 500 Ω
3.3V
OUT
Discharge Resistance OFF/ON = 4V ● 200 500 Ω
V
EEOUT
Discharge Resistance OFF/ON = 4V ● 390 1000 Ω
V
OL
Output Low Voltage PWRGD, RESETOUT, FAULT, I = 1mA ● 0.4 V
V
PXG
PRECHARGE Reference Voltage V
DRIVE
= 2V ● 0.95 1 1.05 V
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
12VIN
= 12V, V
EEIN
= –12V, V
3.3VIN
= 3.3V, V
5VIN
= 5V, unless
otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: The 12V
IN
and V
EEIN
pins will withstand transient surges up to
±15V, respectively, upon hot insertion.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC4244IGN-1#TRPBF

Mfr. #:
Buy LTC4244IGN-1#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Rugged, CompactPCI Bus Hot Swap Cntrs
Lifecycle:
New from this manufacturer.
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