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LTC4241IGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC4241
1
sn4241 4241f
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
■
Allows Safe Board Insertion and Removal from a
Live PCI Slot
■
Controls 3.3V, 5V, –12V, 12V and 3.3V Auxiliary
Supplies
■
Independent 3.3V Auxiliary Supply Hot Swap
TM
Controller
■
Adjustable Foldback Current Limit with Circuit
Breaker
■
Adjustable Supply Voltage Power-Up Rate
■
High Side Drive for External N-Channel FETs
■
–12V and 12V On-Chip Switches
■
Fault and Power Good Outputs
PCI-Bus with 3.3V Auxiliary
Hot Swap Controller
The LTC
®
4241 is a Hot Swap controller that allows a board
to be safely inserted and removed from a live PCI-bus slot.
It has a primary controller that controls the four PCI
supplies and an independent auxiliary controller to control
the 3.3V auxiliary supply. External N-channel transistors
are used to control the 3.3V, 5V and 3.3V auxiliary supplies
while on-chip switches control the –12V and 12V supplies.
The 3.3V, 5V and 3.3V auxiliary supplies can be ramped up
at an adjustable rate. Electronic circuit breakers protect all
five supplies against overcurrent faults. The foldback
current limit feature reduces current spikes and power
dissipation when shorts occur. The PWRGD output of the
primary controller indicates when all four PCI supplies are
within tolerance. The FAULT output indicates an overcurrent
condition for any of the five supplies.
The LTC4241 is available in the 20-pin narrow SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
■
PCI-Based Servers
■
Computer Systems
AUXIN AUXSENSE AUXGATE 3V
IN
3V
SENSE
GATE 3V
OUT
5V
IN
5V
SENSE
5V
OUT
GND
12V
IN
V
EEIN
AUXON
ON
FAULT
PWRGD
C3
10nF
R6
10Ω
C1
0.047µF
C2
0.1µF
R5
10Ω
R3
0.07Ω
R2
0.005Ω
R4
10Ω
R7
100Ω
R1
0.007Ω
LOGIC
RESET
R8 10k
R9 10k
LTC4241
8
1
2
12
5
6
7
20
19
4
11 10 9 13 14 15 3 17 16 18
PCI
POWER
SYSTEM
CONTROLLER
SYSTEM
POWER
SUPPLY
BACKPLANE
CONNECTOR
GND
5V
5A
3.3V
7.6A
3.3V
AUX
500mA
12V
500mA
–12V
100mA
Q1
IRF7413
Q2
IRF7413
Q3
Si2306DS
4241 F01
12V
OUT
V
EEOUT
TIMER
RESET
Figure 1. Hot Swappable PCI and 3.3V Auxiliary Supplies
LTC4241
2
sn4241 4241f
ORDER PART
NUMBER
T
JMAX
= 150°C, θ
JA
= 135°C/W
LTC4241CGN
LTC4241IGN
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
12VIN
= 12V, V
VEEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V,
V
AUXIN
= 3.3V. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DD
V
12VIN
Supply Current ON = V
12VIN
● 2.5 8 mA
V
AUXIN
Supply Current AUXON = V
AUXIN
● 0.5 1.5 mA
V
LKO
Undervoltage Lockout, 12V
IN
● 6.5 9 10.8 V
Low-to-High Transition 3V
IN
● 2.25 2.50 2.75 V
5V
IN
● 3.65 3.90 4.15 V
AUXIN
● 2.35 2.60 2.85 V
V
LKH
Undervoltage Lockout Hysteresis 3V
IN
, 5V
IN
20 mV
AUXIN 120 mV
V
SENSE5(TH)
Current Limit Sense Voltage V
5VOUT
= 0V ● 5.5 9 14.5 mV
Threshold (V
5VIN
– V
5VSENSE
)V
5VOUT
> 4V ● 40 55 70 mV
V
SENSE3(TH)
Current Limit Sense Voltage V
3VOUT
= 0V ● 5.5 9 14.5 mV
Threshold (V
3VIN
– V
3VSENSE
)V
3VOUT
> 2V ● 40 55 70 mV
t
CB
Circuit Breaker Trip Filter Time (V
5VIN
– V
5VSENSE
) = Step 0 to 100mV 17 µs
(V
AUXIN
– V
AUXSENSE
) = Step 0 to 100mV 8 µs
I
GATE
GATE Pin Output Current ON High, FAULT High, V
GATE
= GND ● –20 –60 –100 µA
ON Low, FAULT High, V
GATE
= 5V 200 µA
ON High, FAULT Low, V
GATE
= 5V 5 25 35 mA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GN PACKAGE
20-LEAD NARROW 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
OUT
V
EEOUT
5V
OUT
5V
IN
5V
SENSE
GATE
3V
SENSE
3V
IN
AUXON
AUXIN
12V
IN
V
EEIN
3V
OUT
TIMER
ON
FAULT
PWRGD
GND
AUXGATE
AUXSENSE
Supply Voltages
12V
IN
................................................................... 14V
V
EEIN
.................................................................. –14V
AUXIN ................................................................... 7V
Input Voltage
ON .........................................................–0.3V to 14V
AUXON ..................................................–0.3V to 14V
Output Voltages
(FAULT, PWRGD) ..................................–0.3V to 14V
Analog Voltages
TIMER, 3V
IN
, 3V
SENSE
, GATE,
5V
SENSE
, 5V
IN
.............................
–0.3V to (12V
IN
+ 0.3V)
3V
OUT
, 5V
OUT
........................................–0.3V to 14V
AUXSENSE ..........................–0.3V to (AUXIN + 0.3V)
V
EEOUT
................................................ –14V to + 0.3V
12V
OUT
..................................................–0.3V to 14V
AUXGATE ......................... Internally Limited (Note 3)
Operating Temperature Range
LTC4241CGN........................................... 0°C to 70°C
LTC4241IGN........................................–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering,10sec)....................300°C
DC ELECTRICAL CHARACTERISTICS
LTC4241
3
sn4241 4241f
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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
∆V
GATE
External Gate Voltage (V
12VIN
– V
GATE
) ● 100 200 mV
V
DROP
Internal Switch Voltage Drop (V
12VIN
– V
12VOUT
), I
12VOUT
= 500mA ● 200 600 mV
(V
EEOUT
– V
VEEIN
), I
VEEIN
= 100mA ● 120 250 mV
I
CL(12)
Current Limit 12V
IN
= 12V, 12V
OUT
= 0V, TIMER = GND ● –50 –300 –575 mA
12V
IN
= 12V, 12V
OUT
= 11V, TIMER = GND ● –525 –850 –1500 mA
I
CL(VEE)
Current Limit V
EEIN
= –12V, V
EEOUT
= 0V, TIMER = GND ● 50 200 425 mA
V
EEIN
= –12V, V
EEOUT
= –11V, TIMER = GND ● 250 450 750 mA
T
TS
Thermal Shutdown Temperature 150 °C
V
PG(TH)
Power Good Threshold Voltage V
12VOUT
Rising ● 10.8 11.1 11.4 V
V
VEEOUT
Falling ● –10.2 –10.5 –10.8 V
V
3VOUT
Rising ● 2.8 2.9 3.0 V
V
5VOUT
Rising ● 4.5 4.65 4.78 V
V
PGH
Power Good Hysteresis 3V
OUT
20 mV
5V
OUT
30 mV
12V
OUT
, V
EEOUT
50 mV
V
IL
Input Low Voltage ON, AUXON ● 0.8 V
V
IH
Input High Voltage ON, AUXON ● 2V
V
OL
Output Low Voltage FAULT, PWRGD , I
OL
= 3mA ● 0.4 V
I
IN
AUXON Pin Input Current AUXON = GND ● ±0.08 ±10 µA
AUXON = V
AUXIN
● ±0.08 ±10 µA
ON Pin Input Current ON = GND ● ±0.08 ±10 µA
ON = V
12VIN
● ±0.08 ±10 µA
5V
SENSE
Input Current 5V
SENSE
= 5V ● 50 100 µA
3V
SENSE
Input Current 3V
SENSE
= 3V ● 50 100 µA
5V
IN
Input Current 5V
IN
= 5V ● 580 900 µA
3V
IN
Input Current 3V
IN
= 3V ● 310 550 µA
5V
OUT
Input Current 5V
OUT
= 5V, ON = V
12VIN
● 260 500 µA
3V
OUT
Input Current 3V
OUT
= 3V, ON = V
12VIN
● 150 350 µA
R
DIS
5V
OUT
Discharge Impedance ON = GND 60 Ω
3V
OUT
Discharge Impedance ON = GND 50 Ω
12V
OUT
Discharge Impedance ON = GND 450 Ω
V
EEOUT
Discharge Impedance ON = GND 1600 Ω
I
TIMER
TIMER Pin Current Timer On, V
TIMER
= GND, ● –15 –22 –27 µA
Timer Off, V
TIMER
= 5V, 45 mA
V
TIMER
TIMER Threshold Voltage
(V
12VIN
– V
TIMER
) ● 0.5 0.9 1.3 V
V
AUXCB
Circuit Breaker Trip Voltage
(V
AUXIN
– V
AUXSENSE
) ● 40 50 60 mV
I
AUXGATE
AUXGATE Gate Output Current AUXON High, FAULT High, V
AUXGATE
= GND ● –6 –10 –14 µA
AUXON Low, FAULT High, V
AUXGATE
= 5V 200 µA
AUXON High, FAULT Low, V
AUXGATE
= 10V 50 mA
∆V
AUXGATE
External AUXGATE Gate Voltage (V
AUXGATE
– V
AUXIN
), V
AUXIN
= 3.3V ● 5811 V
Note 3 : An internal zener on the AUXGATE pin clamps the charge pump
voltage to a typical maximum operating voltage of 12V. External overdrive
of the AUXGATE pin beyond the internal zener voltage may damage the
device.
DC 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
VEEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V,
V
AUXIN
= 3.3V. (Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC4241IGN#PBF

Mfr. #:
Buy LTC4241IGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers PCI-Bus w/ 3.3V Auxiliary Hot Swap Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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