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参数资料
| 型号： | DC1669A |
| 厂商： | Linear Technology |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM4627 |
| 软件下载： | LTM4627 Spice Model |
| 设计资源： | LTM4627 Gerber Files DC1669A Design Files |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1V，1.2V，1.5V，1.8V，2.5V，3.3V |
| 电流 - 输出： | 15A |
| 输入电压： | 4.5 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM4627 |
| 相关产品： | LTM4627IV#PBF-ND - IC UMODULE DC/DC 15A 133LGA LTM4627EV#PBF-ND - IC UMODULE DC/DC 15A 133LGA |
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LTM4627
APPLICATIONS INFORMATION
Figure 11 the load current is derated to ~12A at ~80°C with
no air or heat sink and the power loss for the 12V to 1.2V
at 12A output is about 2.8W. The 2.8W loss is calculated
with the ~2.35W room temperature loss from the 12V to
1.2V power loss curve at 12A, and the 1.2 multiplying
factor at 80°C ambient. If the 80°C ambient temperature
is subtracted from the 120°C junction temperature, then
the difference of 40°C divided by 2.8W equals a 14°C/W
θ JA thermal resistance. Table 2 specifies a 13°C/W value
which is very close. Table 2 and Table 3 provide equivalent
thermal resistances for 1.2V and 3.3V outputs with and
without airflow and heat sinking. The derived thermal
resistances in Tables 2 and 3 for the various conditions can
be multiplied by the calculated power loss as a function
of ambient temperature to derive temperature rise above
ambient, thus maximum junction temperature. Room
temperature power loss can be derived from the efficiency
curves in the Typical Performance Characteristics section
and adjusted with the above ambient temperature multipli-
cative factors. The printed circuit board is a 1.6mm thick
four layer board with two ounce copper for the two outer
layers and one ounce copper for the two inner layers. The
PCB dimensions are 95mm × 76mm. The BGA heat sinks
are listed in Table 4.
3.0
2.5
2.0
1.5
1.0
0.5
0
5V IN TO 1.2V OUT POWER LOSS
12V IN TO 1.2V OUT POWER LOSS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
6
5
4
3
2
1
0
5V IN TO 3.3V OUT POWER LOSS
12V IN TO 3.3V OUT POWER LOSS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OUTPUT CURRENT (A)
4627 F07
Figure 7. 1.2V OUT Power Loss at 25°C
16
14
12
10
8
6
4
OUTPUT CURRENT (A)
4627 F08
Figure 8. 3.3V OUT Power Loss at 25°C
16
14
12
10
8
6
4
2
0
40
50
0 LFM
200 LFM
400 LFM
60 70
80
90 100 110 120 130
2
0
40
50
0 LFM
200 LFM
400 LFM
60 70
80
90 100 110 120 130
AMBIENT TEMPERATURE (°C)
4627 F09
Figure 9. 5V IN to 1.2V OUT No Heat Sink
AMBIENT TEMPERATURE (°C)
4627 F10
Figure 10. 5V IN to 1.2V OUT with Heat Sink
4627fc
For more information www.linear.com/LTM4627
19
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