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參數(shù)資料
| 型號： | LP2997 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Hex Inverters 14-TSSOP -40 to 85 |
| 中文描述： | 的DDR - II終端調(diào)節(jié)器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 233K |
| 代理商： | LP2997 |
Thermal Dissipation
(Continued)
top side of the board can also help. With careful layout it is
possible to reduce the
θ
JA
further than the nominal values
shown in
Figure 1
Optimizing the
θ
JA
and placing the LP2997 in a section of a
board exposed to lower ambient temperature allows the part
to operate with higher power dissipation. The internal power
dissipation can be calculated by summing the three main
sources of loss: output current at V
, either sinking or
sourcing, and quiescent current at AVIN and VDDQ. During
the active state (when shutdown is not held low) the total
internal power dissipation can be calculated from the follow-
ing equations:
P
D
= P
AVIN
+ P
VDDQ
+ P
VTT
Where,
P
AVIN
= I
AVIN
* V
AVIN
P
VDDQ
= V
VDDQ
* I
VDDQ
= V
VDDQ
2
x R
VDDQ
To calculate the maximum power dissipation at V
both
conditions at V
need to be examined, sinking and sourcing
current. Although only one equation will add into the total,
V
TT
cannot source and sink current simultaneously.
P
VTT
= V
VTT
x I
LOAD
(Sinking) or
P
VTT
= ( V
PVIN
- V
VTT
) x I
LOAD
(Sourcing)
The power dissipation of the LP2997 can also be calculated
during the shutdown state. During this condition the output
V
TT
will tri-state, therefore that term in the power equation
will disappear as it cannot sink or source any current (leak-
age is negligible). The only losses during shutdown will be
the reduced quiescent current at AVIN and the constant
impedance that is seen at the VDDQ pin.
P
D
= P
AVIN
+ P
VDDQ
P
AVIN
= I
AVIN
x V
AVIN
P
VDDQ
= V
VDDQ
* I
VDDQ
= V
VDDQ
2
x R
VDDQ
L
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9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2997M | 功能描述:線性穩(wěn)壓器 - 標準 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| LP2997M/NOPB | 功能描述:線性穩(wěn)壓器 - 標準 DDR Termination Reg RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| LP2997MR | 功能描述:線性穩(wěn)壓器 - 標準 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| LP2997MR NOPB | 制造商:Texas Instruments 功能描述: |
| LP2997MR/NOPB | 功能描述:線性穩(wěn)壓器 - 標準 DDR Termination Reg RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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