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LTC4244IGN-1#TRPBF

Description
IC CTRLR HOTSWAP PCI 20-SSOP
CategoryPower/power management    The power supply circuit   
File Size372KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC4244IGN-1#TRPBF Overview

IC CTRLR HOTSWAP PCI 20-SSOP

LTC4244IGN-1#TRPBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP20,.25
Contacts20
Manufacturer packaging codeGN
Reach Compliance Codecompliant
ECCN codeEAR99
Adjustable thresholdNO
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PDSO-G20
JESD-609 codee3
length8.649 mm
Humidity sensitivity level1
Number of channels4
Number of functions1
Number of terminals20
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP20,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
power supply3.3,5,+-12 V
Certification statusNot Qualified
Maximum seat height1.75 mm
Maximum supply current (Isup)10 mA
Nominal supply voltage (Vsup)12 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.899 mm
LTC4244/LTC4244-1
Rugged, CompactPCI Bus
Hot Swap Controllers
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
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
APPLICATIO S
s
Hot Board Insertion into CompactPCI Bus
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
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#.
TYPICAL APPLICATIO
5V
LONG 5V
3.3V
LONG 3.3V
C8
0.01µF PER
POWER PIN
R22
2.7Ω
C9
0.01µF PER
POWER PIN
5V
IN
R2
Q2
0.007Ω IRF7457
3.3V
IN
R21
1.8Ω
C6
0.01µF
C7
0.01µF
Z3
Z4
R1
0.005Ω
Q1
IRF7457
R3
10Ω
Z1
12V
–12V
Z2
3.3V
IN
3.3V
SENSE
GATE 3.3V
OUT
5V
IN
12V
IN
V
EEIN
R19 1k
OFF/ON
R20
1.2k
R18 10k
FAULT
PWRGD
RESETIN
GND PRECHARGE
LTC4244
5V
SENSE
BD_SEL#
LONG V(I/O)
R17
10k
HEALTHY#
PCI_RST#
R15
1Ω
C4
0.01µF
GROUND
I/O DATA LINE 1
R13
10Ω
R16
1Ω
C5
0.01µF
TIMER
DRIVE RESETOUT
C3 4.7nF
R9 24Ω
R8 1k
LOCAL_PCI_RST#
R10 18Ω
R11
10k
R12
10k
I/O PIN 1
I/O PIN 128
1V
±10%
Q3
R7 12Ω
MMBT2222A
I/O DATA LINE 128
Z1, Z2: SMAJ12A
Z3, Z4: SMAJ5.0A
R14
10Ω
Figure 1. Typical Compact PCI Application
42441f
+
U
+
C
LOAD(5VOUT)
V
OUT
5V
5A
V
OUT
3.3V
7A
U
U
+
C
LOAD(3.3VOUT)
R4
10Ω
C1
R5 0.33µF
1k
5V
OUT
12V
OUT
+
C
LOAD(12VOUT)
V
OUT
12V
500mA
V
EEOUT
–12V
100mA
V
EEOUT
C
LOAD(VEEOUT)
C2
0.082µF
R6
10k
V
OUT
3.3V
V
IN
3.3V
RESET#
I/O #1
PCI
BRIDGE
I/O #128 CHIP
4244 F01
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