LTC1646CGN Linear Technology, LTC1646CGN Datasheet - Page 18

• Manufacturer Part Number: LTC1646CGN
• Description: IC CNTRLR HOTSWAP PCIDUAL 16SSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC1646CGN

• Applications: CompactPCI™
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1646
APPLICATIO S I FOR ATIO
PCB Layout Considerations
For proper operation of the LTC1646’s circuit breaker
function, a 4-wire Kelvin connection to the sense resistors
is highly recommended. A recommended PCB layout for
the sense resistor, the power MOSFET, and the GATE drive
components around the LTC1646 is illustrated in
Figure 15. In Hot Swap applications where load currents
can reach 10A, narrow PCB tracks exhibit more resistance
than wider tracks and operate at more elevated tempera-
tures. Since the sheet resistance of 1 ounce copper foil is
approximately
in high current applications. Thus, to keep PCB track
resistance and temperature rise to a minimum, the sug-
gested trace width in these applications for 1 ounce
copper foil is 0.03" for each ampere of DC current.
18
0.5mΩ/■ ■
Table 6. N-Channel Power MOSFET Selection Guide
CURRENT LEVEL (A)
0 to 2
2 to 5
5 to 10
5 to 10
5 to 10
Table 7. Sense Resistor Selection Guide
CURRENT LIMIT VALUE
1A
2A
5A
7.6A
10A
U
, track resistances add up quickly
U
W
PART NUMBER
MMDF3N02HD
MMSF5N02HD
MTB50N06V
IRF7413
Si4410DY
PART NUMBER
LR120601R055F
WSL1206R055
LR120601R028F
WSL1206R028
LR120601R011F
WSL2010R011
WSL2512R007
WSL2512R005
U
DESCRIPTION
Dual N-Channel SO-8
R
Single N-Channel SO-8
R
Single N-Channel DD Pak
R
Single N-Channel SO-8
R
Single N-Channel SO-8
R
DESCRIPTION
0.055Ω, 0.5W, 1% Resistor
0.028Ω, 0.5W, 1% Resistor
0.011Ω, 0.5W, 1% Resistor
0.007Ω, 1W, 1% Resistor
0.005Ω, 1W, 1% Resistor
DS(ON)
DS(ON)
DS(ON)
DS(ON)
DS(ON)
In the majority of applications, it will be necessary to use
plated-through vias to make circuit connections from
component layers to power and ground layers internal to
the PC board. For 1 ounce copper foil plating, a general rule
is 1A of DC current per via, making sure the via is properly
dimensioned so that solder completely fills any void. For
other plating thicknesses, check with your PCB fabrication
facility.
Power MOSFET and Sense Resistor Selection
Table 6 lists some current MOSFET transistors that are
available and Table 7 lists some current sense resistors
that can be used with the LTC1646’s circuit breakers.
Table 8 lists supplier web site addresses for discrete
component mentioned throughout the LTC1646 data sheet.
= 0.1Ω
= 0.025Ω
= 0.028Ω
= 0.01Ω
= 0.01Ω
MANUFACTURER
ON Semiconductor
ON Semiconductor
ON Semiconductor
International Rectifier
Vishay-Siliconix
IRC-TT
Vishay-Dale
IRC-TT
Vishay-Dale
IRC-TT
Vishay-Dale
Vishay-Dale
Vishay-Dale
MANUFACTURER
1646fa