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参数资料
| 型号： | LTC4245IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 28/36页 |
| 文件大小： | 431K |
| 描述： | IC CNTRLR HOT SWAP 36-SSOP |
| 标准包装： | 1,000 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
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LTC4245
28
4245fa
drop and temperature rise to a minimum, the suggested
trace width in these applications for 1oz copper foil is
0.03 for each ampere of DC current.
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 PCB. For 1oz copper foil plating, a general rule is
1A of DC current per via, making sure the via is properly
dimensioned so that solder completely lls any void. For
other plating thicknesses, check with your PCB fabrica-
tion facility.
It is also important to put C1, the bypass capacitor for the
INTV
CC
pin as close as possible between INTV
CC
and GND.
The surge suppressors, Z1 and Z2, are placed between the
supply inputs and ground using wide traces.
PCB Layout Considerations
For proper operation of the LTC4245s circuit breaker,
Kelvin connection to the sense resistors is strongly
recommended. The PCB layout should be balanced and
symmetrical to minimize wiring errors. In addition, the
PCB layout for the sense resistors and the power MOSFETs
should include good thermal management techniques for
optimal device power dissipation. A recommended PCB
layout for the 5V sense resistor and the power MOSFET
around the LTC4245 is illustrated in Figure 18. In Hot Swap
applications where load currents can be 10A, narrow PCB
tracks exhibit more resistance than wider tracks and operate
at more elevated temperatures. Since the sheet resistance
of 1 ounce copper foil is approximately 0.5m?o, track
resistances and voltage drops add up quickly in high current
applications. Thus, to keep PCB track resistance, voltage
APPLICATIO S I FOR ATIO
U
U
U
Figure 18. Recommended Layout for R2, Q2, R6, Z2, C1, Z1, R10 and C2
2
3
4
5
6
7
8
9
LTC4245G*
CURRENT FLOW
TO SOURCE
*ADDITIONAL DETAILS OMITTED FOR CLARITY
DRAWING IS NOT TO SCALE!
4245 F18
TRACK WIDTH W:
0.03" PER AMPERE
ON 1 OZ Cu FOIL
D
D
D
D
G
S
S
S
CURRENT FLOW
TO LOAD
CURRENT FLOW
TO LOAD
R2 SENSE
RESISTOR
Q2
SO-8
VIA TO
GND PLANE
VIA TO
GND PLANE
GND
GND
5V
OUT
5V
IN
R10
C2
R6
W
W
W
Z2
Z1
C1
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