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Linear Technology Electronic Components Datasheet

LTC1647-3 Datasheet

Dual Hot Swap Controllers

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LTC1647-3 pdf
LTC1647-1/LTC1647-2/LTC1647-3
Dual Hot Swap Controllers
FEATURES
s Allows Safe Board Insertion and Removal from a
Live Backplane
s Programmable Electronic Circuit Breaker
s FAULT Output Indication
s Programmable Supply Voltage Power-Up Rate
s High Side Drive for External MOSFET Switches
s Controls Supply Voltages from 2.7V to 16.5V
s Undervoltage Lockout
U
APPLICATIO S
s Hot Board Insertion
s Electronic Circuit Breaker
s Portable Computer Device Bays
s Hot Plug Disk Drive
DESCRIPTIO
The LTC®1647-1/LTC1647-2/LTC1647-3 are dual Hot
SwapTM controllers that permit a board to be safely in-
serted and removed from a live backplane.
Using external N-channel MOSFETs, the board supply
voltages can be ramped up at a programmable rate. A high
side switch driver controls the MOSFET gates for supply
voltages ranging from 2.7V to 16.5V. A programmable
electronic circuit breaker protects against overloads and
shorts. The ON pins are used to control board power or
clear a fault.
The LTC1647-1 is a dual Hot Swap controller with a
common VCC pin, separate ON pins and is available in an
SO-8 package. The LTC1647-2 is similar to the LTC1647-1
but combines a fault status flag with automatic retry at the
ON pins and is also available in the SO-8 package. The
LTC1647-3 has individual VCC pins, ON pins and FAULT
status pins for each channel and is available in a 16-lead
narrow SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
3.3V VID
SUPPLY
R1
0.1
Q1
1/2 MMDF3N02HD
R2
10
VID Controller for Two Device Bays
R3**
DEVICE #1
+ 1394 PHY
CLOAD* R4** AND/OR
USB PORT
86
SENSE 1 GATE 1
1
2 VCC
ON1 3 ON1 LTC1647-1
ON2 ON2
4
GND
SENSE 2 GATE 2
75
R5
0.1
R6
10
Q2
1/2 MMDF3N02HD
C1
4.7nF
* CLOAD IS USER-SELECTED BASED
ON THE DEVICE REQUIREMENTS
** R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE
RESISTORS WHEN DEVICES ARE POWERED-OFF
Q1, Q2: ON SEMICONDUCTOR
C3
4.7nF
R7**
DEVICE #2
+ 1394 PHY
CLOAD* R8** AND/OR
USB PORT
ON/OFF Sequence
VON
VGATE
VOUT
5ms/DIV
1647-1/2/3 TA01a
1647-1/2/3 TA01
1


Linear Technology Electronic Components Datasheet

LTC1647-3 Datasheet

Dual Hot Swap Controllers

No Preview Available !

LTC1647-3 pdf
LTC1647-1/LTC1647-2/LTC1647-3
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ............................................... 17V
Input Voltage (SENSE) ................. – 0.3V to (VCC + 0.3V)
Input Voltage (ON) .....................................– 0.3V to 17V
Output Voltage (FAULT) .............................– 0.3V to 17V
Output Voltage (GATE) ......... Internally Limited (Note 3)
UW U
PACKAGE/ORDER I FOR ATIO
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
VCC 1
ON1 2
ON2 3
GND 4
8 SENSE 1
7 SENSE 2
6 GATE 1
5 GATE 2
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/W
ORDER PART NUMBER
LTC1647-1CS8
LTC1647-1IS8
S8 PART MARKING
16471
16471I
Consult factory for Military grade parts.
TOP VIEW
VCC 1
ON1/FAULT 1 2
ON2/FAULT 2 3
GND 4
8 SENSE 1
7 SENSE 2
6 GATE 1
5 GATE 2
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/W
ORDER PART NUMBER
LTC1647-2CS8
LTC1647-2IS8
S8 PART MARKING
16472
16472I
TOP VIEW
VCC1 1
ON1 2
FAULT 1 3
ON2 4
FAULT 2 5
NC 6
NC 7
GND 8
16 VCC2
15 SENSE 1
14 SENSE 2
13 GATE 1
12 GATE 2
11 NC
10 NC
9 NC
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 130°C/W
ORDER PART NUMBER
LTC1647-3CGN
LTC1647-3IGN
GN PART MARKING
16473
16473I
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC VCCX Supply Range
Operating Range
q 2.7
16.5
ICC VCC Supply Current (Note 4)
ON1, ON2 = VCC1 = VCC2, ICC = ICC1 + ICC2
q
1.0 6
ICCX VCCX Supply Current (Note 5, LTC1647-3) ONX = VCCX, ICCX Individually Measured,
q
VCC1 = 5V, VCC2 = 12V or VCC1 = 12V, VCC2 = 5V
0.5 5
VLKO VCCX Undervoltage Lockout
Coming Out of UVLO (Rising VCCX)
q 2.30 2.45 2.60
VLKH VCCX Undervoltage Lockout Hysteresis
210
VCB Circuit Breaker Trip Voltage
VCB = VCCX – VSENSEX
q 40 50 60
ICP GATE X Output Current
ONX High, FAULT X High, VGATE = GND (Sourcing) q
ONX Low, FAULT X High, VGATE = VCC (Sinking)
ONX High, FAULT X Low, VGATE = 15V (Sinking)
6
10 14
50
50
V
mA
mA
V
mV
mV
µA
µA
mA
2


Part Number LTC1647-3
Description Dual Hot Swap Controllers
Maker Linear Technology
Total Page 20 Pages
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LTC1647-3 pdf
LTC1647-3 Datasheet PDF
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