参数资料
型号: LTM4614EV#PBF
厂商: Linear Technology
文件页数: 12/20页
文件大小: 0K
描述: IC UMODULE DC/DC DUAL 4A 144LGA
产品培训模块: Power Module vs. Discrete DC to DC
软件下载: LTM4614
产品目录绘图: LTM Series_15x15x2.8
设计资源: DC1385A Design Files
特色产品: μModule Products
DC/DC μModule Regulator Family
标准包装: 119
系列: µModule®
类型: 非隔离(POL)
输出数: 2
电压 - 输入(最小): 2.38V
电压 - 输入(最大): 5.5V
Voltage - Output 1: 0.8 ~ 5 V
Voltage - Output 2: 0.8 ~ 5 V
电流 - 输出(最大): 4A,4A
安装类型: 表面贴装
封装/外壳: 144-LGA
尺寸/尺寸: 0.59" L x 0.59" W x 0.11" H(15.0mm x 15.0mm x 2.8mm)
包装: 托盘
工作温度: -40°C ~ 125°C
效率: 95%
产品目录页面: 2711 (CN2011-ZH PDF)
配用: DC1385A-ND - BOARD EVAL LTM4614
LTM4614
APPLICATIONS INFORMATION
module temperature rise can be allowed. As an example, in
Figure 7 the load current is derated to 3A for each channel
with 0LFM at ~ 90°C and the total combined power loss for
both channels at 5V to 1.2V at 3A output is ~1.5 watts. If
the 90°C ambient temperature is subtracted from the 120°C
maximum junction temperature, then the difference of
30°C divided by 1.5W equals a 20°C/W thermal resistance.
Table 2 specifies a 15°C/W value which is close. Table 2
and Table 3 provide equivalent thermal resistances for
1.2V and 3.3V outputs with and without air flow and
4.5
4.0
3.5
heat sinking. The combined power loss for the two 4A
outputs can be summed together and multiplied by the
thermal resistance values in Tables 2 and 3 for module
temperature rise under the specified conditions. The
printed circuit board is a 1.6mm thick four layer board
with 2 ounce copper for the two outer layers and 1 ounce
copper for the two inner layers. The PCB dimensions are
95mm × 76mm. The data sheet lists the θ JA (junction to
ambient) and θ JC (junction to case) thermal resistances
under the Pin Configuration diagram.
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
200LFM NO HEAT SINK
400LFM NO HEAT SINK
0LFM NO HEAT SINK
3.0
2.5
2.0
1.5
1.0
0.5
2 00LFM    HEAT SINK
4 00LFM    HEAT SINK
0LFM HEAT SINK
0
40
50
60
70
80
90
100 110 120
0
40
50
60
70
80
90
100 110 120
AMBIENT TEMPERATURE (°C)
4614 F07
AMBIENT TEMPERATURE (°C)
4614 F08
Figure 7. 1.2V No Heat Sink (V IN = 5V)
4.5
4.0
3.5
4.5
4.0
3.5
Figure 8. 1.2V Heat Sink (V IN = 5V)
3.0
2.5
2.0
1.5
1.0
0.5
2 00LFM    NO HEAT SINK
400LFM NO HEAT SINK
0LFM NO HEAT SINK
3.0
2.5
2.0
1.5
1.0
0.5
4 00LFM    HEAT SINK
2 00LFM    HEAT SINK
0 LFM  HEAT SINK
0
40
50
60
70
80
90
100 110 120
0
40
50
60
70
80
90
100 110 120
AMBIENT TEMPERATURE (°C)
4614 F09
AMBIENT TEMPERATURE (°C)
4614 F10
Figure 9. 3.3V No Heat Sink (V IN = 5V)
Figure 10. 3.3V Heat Sink (V IN = 5V)
4614fb
12
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