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參數(shù)資料
| 型號(hào)： | ADP3338 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Two, Three and Four Cell Lithium or Lithium-Polymer Battery Protection AFE 30-TSSOP -40 to 110 |
| 中文描述： | 高精度超低智商，一甲，anyCAP低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 144K |
| 代理商： | ADP3338 |
REV. 0
ADP3338
–7–
THERMAL OVERLOAD PROTECTION
The ADP3338 is protected against damage due to excessive power
dissipation by its thermal overload protection circuit. Thermal
protection limits the die temperature to a maximum of 160
°
C.
Under extreme conditions (i.e., high ambient temperature and
power dissipation) where the die temperature starts to rise above
160
°
C, the output current will be reduced until the die tempera-
ture has dropped to a safe level.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For normal
operation, the device’s power dissipation should be externally
limited so that the junction temperature will not exceed 150
°
C.
CALCULATING POWER DISSIPATION
Device power dissipation is calculated as follows:
(
Where
I
LOAD
and
I
GND
are load current and ground current,
V
IN
and
V
OUT
are the input and output voltages respectively.
Assuming worst-case operating conditions are I
LOAD
= 1.0 A,
I
GND
= 10 mA, V
IN
= 3.3 V and V
OUT
= 2.5 V, the device power
dissipation is:
D
=
(
3 3
2 5
1000
.
–
.
So, for a junction temperature of 125
°
C and a maximum ambi-
ent temperature of 85
°
C, the required thermal resistance from
junction to ambient is:
P
V
V
I
V
I
D
IN
OUT
LOAD
IN
GND
=
)
×
+
(
)
×
P
V
V
mA
V
mA
mW
)
+
(
)
=
3 3
.
10
833
θ
JA
=
°
.
°
=
°
125
85
W
0 833
48
C
C
C W
/
–
PRINTED CIRCUIT BOARD LAYOUT
CONSIDERATIONS
The SOT-223
’
s thermal resistance,
θ
JA
, is determined by the
sum of the junction-to-case and the case-to-ambient thermal
resistances. The junction-to-case thermal resistance,
θ
JC
, is
determined by the package design and specified at 26.8
°
C/W.
However, the case-to-ambient thermal resistance is determined
by the printed circuit board design.
As shown in Figures 4a
–
c, the amount of copper the ADP3338
is mounted to affects the thermal performance. When mounted
to 2 oz. copper with just the minimal pads, Figure 4a, the
θ
JA
is
126.6
°
C/W. By adding a small copper pad under the ADP3338,
Figure 4b, reduces the
θ
JA
to 102.9
°
C/W. Increasing the copper
pad to 1 square inch, Figure 4c, reduces the
θ
JA
even further
to 52.8
°
C/W.
a.
b.
c.
Figure 4. PCB Layouts
Use the following general guidelines when designing printed
circuit boards:
1. Keep the output capacitor as close to the output and ground
pins as possible.
2. Keep the input capacitor as close to the input and ground
pins as possible.
3. PC board traces with larger cross sectional areas will remove
more heat from the ADP3338. For optimum heat transfer,
specify thick copper and use wide traces.
4. The thermal resistance can be decreased by adding a copper
pad under the ADP3338 as shown in Figure 4b.
5. If possible, utilize the adjacent area to add more copper
around the ADP3338. Connecting the copper area to the
output of the ADP3338, as shown in Figure 4c, is best but
will improve thermal performance even if it is connected to
other signals.
6. Use additional copper layers or planes to reduce the thermal
resistance. Again, connecting the other layers to the output
of the ADP3338 is best, but not necessary. When connecting
the output pad to other layers use multiple vias.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP3338AKC-25 | Circular Connector; No. of Contacts:21; Series:MS27474; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:22-21 RoHS Compliant: No |
| ADP3338AKC-285 | JT 100C 100#22D PIN RECP |
| ADP3338AKC-33 | JT 55C 55#20 PIN RECP |
| ADP3338AKC-5 | CONNECTOR |
| ADP3339AKC-18 | JT 85C 85#22 PIN RECP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3338AKC-1.5-RL | 功能描述:IC REG LDO 1.5V 1A SOT223 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:anyCAP® 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| ADP3338AKC-1.5-RL7 | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.5V 1.6A 4-Pin(3+Tab) SOT-223 T/R |
| ADP3338AKC-1.8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| ADP3338AKC-1.8-RL | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.8V 1.6A 4-Pin(3+Tab) SOT-223 T/R |
| ADP3338AKC-1.8-RL7 | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.8V 1.6A 4-Pin(3+Tab) SOT-223 T/R 制造商:Analog Devices 功能描述:IC VOLTAGE REGULATOR |
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