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參數資料
| 型號： | TPS2158IDGNRG4 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3.3-V LDO AND DUAL SWITCH FOR USB PERIPHERAL POWER MANAGEMENT |
| 中文描述： | 3.3V的穩(wěn)壓器和雙開關的USB外圍電源管理 |
| 文件頁數： | 14/19頁 |
| 文件大小： | 274K |
| 代理商： | TPS2158IDGNRG4 |
TPS2148
TPS2158
SLVS373
–
AUGUST 2001
14
www.ti.com
APPLICATION INFORMATION
power dissipation and junction temperature
The main source of power dissipation for the TPS2148 and TPS2158 comes from the internal voltage regulator
and the N-channel MOSFETs. Checking the power dissipation and junction temperature is always a good
design practice and it starts with determining the r
DS
(on)
of the N-channel MOSFET
according to the input voltage
and operating temperature. As an initial estimate, use the highest operating ambient temperature of interest and
read r
DS
(on)
from the graphs shown in the Typical Characteristics section of this data sheet. Using this value,
the power dissipation per switch can be calculated using:
P
D
r
DS(on)
I
2
Multiply this number by two to get the total power dissipation coming from the N-channel MOSFETs.
The power dissipation for the internal voltage regulator is calculated using:
P
D
VI
–
VO(min)
IO
The total power dissipation for the device becomes:
P
D(total)
PD(voltage regulator)
2
PD(switch)
Finally, calculate the junction temperature:
T
J
P
D
R
JA
T
A
Where:
T
A
= Ambient Temperature
°
C
R
θ
JA
= Thermal resistance
°
C/W, equal to inverting the derating factor found on the power
dissipation table in this datasheet.
Compare the calculated junction temperature with the initial estimate. If they do not agree within a few degrees,
repeat the calculation, using the calculated value as the new estimate. Two or three iterations are generally
sufficient to get a reasonable answer.
(1)
(2)
(3)
(4)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS2159DGN | 制造商:Texas Instruments 功能描述: |
| TPS2159IDGN | 功能描述:電源開關 IC - USB 3.3V LDO + Dual Switch RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2159IDGN | 制造商:Texas Instruments 功能描述:IC 3.3V LDO/DUAL SWITCH 8-MSOP 制造商:Texas Instruments 功能描述:IC, 3.3V LDO/DUAL SWITCH 8-MSOP |
| TPS2159IDGNG4 | 功能描述:電源開關 IC - USB 3.3V LDO + Dual Switch RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2201IDB | 功能描述:電源開關 IC - 配電 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Exar 輸出端數量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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