参数资料
型号: ADP2140ACPZ1812R7
厂商: Analog Devices Inc
文件页数: 28/32页
文件大小: 2731K
描述: IC REG DL BCK/LINEAR 10LFCSP
标准包装: 1
拓扑: 降压(降压)同步(1),线性(LDO)(1)
功能: 任何功能
输出数: 2
频率 - 开关: 3MHz
电压/电流 - 输出 1: 1.8V,600mA
电压/电流 - 输出 2: 1.2V,300mA
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 1.65 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘,CSP
供应商设备封装: 10-LFCSP-WD(3x3)
包装: 标准包装
其它名称: ADP2140ACPZ1812R7DKR
ADP2140
Data Sheet
 
Rev. A | Page 28 of 32
THERMAL CONSIDERATIONS
In most applications, the ADP2140 does not dissipate much
heat due to its high efficiency. However, in applications with
high ambient temperature and high supply voltage-to-output
voltage differential, the heat dissipated in the package is large
enough that it can cause the junction temperature of the die to
exceed the maximum junction temperature of 125癈.
When the junction temperature exceeds 150癈, the converter
enters thermal shutdown. It recovers only after the junction
temperature has decreased below 130癈 to prevent any permanent
damage. Therefore, thermal analysis for the chosen application
is very important to guarantee reliable performance over all
conditions. The junction temperature of the die is the sum of
the ambient temperature of the environment and the tempera-
ture rise of the package due to the power dissipation, as shown
in Equation 2.
To guarantee reliable operation, the junction temperature of the
ADP2140 must not exceed 125癈. To ensure the junction temper-
ature stays below this maximum value, the user needs to be aware
of the parameters that contribute to junction temperature changes.
These parameters include ambient temperature, power dissipa-
tion in the power device, and thermal resistances between the
junction and ambient air (?/DIV>
JA
). The ?/DIV>
JA
 number is dependent on
the package assembly compounds that are used and the amount of
copper used to solder the package GND pins to the PCB. Table 10
shows typical ?/DIV>
JA
 values of the 10-lead, 3 mm ?3 mm LFCSP for
various PCB copper sizes.
Table 10. Typical ?/DIV>
JA
 Values
Copper Size (mm
2
) 
?nbsp  (癈/W)
0
1
 
42.5
50
40.0
100
38.8
300
37.2
500
36.2
1
 The device is soldered to minimum size pin traces.
 
The junction temperature of the ADP2140 can be calculated
from the following equation:
T
J
 = T
A
 + (P
D
 ??/DIV>
JA
)
(2)
where:
T
A
 is the ambient temperature.
P
D
 is the total power dissipation in the die, given by
P
D
 = P
LDO
 + P
BUCK
 
where:
P
LDO
 = [(V
IN
  V
OUT
) ?I
LOAD
] + (V
IN
 ?I
AGND
)
(3)
P
BUCK
 = P
SW
 + P
TRAN
 + P
SW_COND
 
(4)
where:
I
LOAD
 is the LDO load current.
I
AGND
 is the analog ground current.
V
IN
 and V
OUT
 are the LDO input and output voltages,
respectively.
P
SW
, P
TRAN
, and P
SW_COND
 are defined in the Efficiency section.
For a given ambient temperature and total power dissipation,
there exists a minimum copper size requirement for the PCB to
ensure the junction temperature does not rise above 125癈. The
following figures show junction temperature calculations for
different ambient temperatures, total power dissipation, and
areas of PCB copper.
145
135
125
115
105
95
85
75
65
55
45
35
25
0    0.25  0.50  0.75  1.00  1.25  1.50  1.75  2.00  2.25  2.50  2.75  3.00
TOTAL POWER DISSIPATION W
500mm
2
50mm
2
0mm
2
T
J MAX
 
Figure 91. Junction Temperature vs. Power Dissipation, T
A
 = 25癈
140
130
120
110
100
90
80
70
60
50
0
0.25   0.50   0.75   1.00   1.25   1.50   1.75   2.00   2.25   2.50
TOTAL POWER DISSIPATION W
500mm
2
50mm
2
0mm
2
T
J MAX
 
Figure 92. Junction Temperature vs. Power Dissipation, T
A
 = 50癈
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