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參數(shù)資料
| 型號： | TPS75425QPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, PDSO20 |
| 封裝： | PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 17/31頁 |
| 文件大?。?/td> | 608K |
| 代理商： | TPS75425QPWPREP |
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TPS75201EP, TPS75215EP, TPS75218EP, TPS75225EP, TPS75233EP WITH RESET
TPS75401EP, '75415EP, '75418EP, '75425EP, '75433EP WITH POWER GOOD
FAST TRANSIENT RESPONSE 2A LOW DROPOUT VOLTAGE REGULATORS
SGLS165 APRIL 2003
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
THERMAL INFORMATION
thermally enhanced TSSOP-20 (PWP PowerPad
) (continued)
Figure 28 is an example of a thermally enhanced PWB layout for use with the new PWP package. This board
configuration was used in the thermal experiments that generated the power ratings shown in Figure 26 and Figure
27. As discussed earlier, copper has been added on the PWB to conduct heat away from the device. RθJA for this
assembly is illustrated in Figure 26 as a function of heat-sink area. A family of curves is included to illustrate the effect
of airflow introduced into the system.
Board thickness
62 mils
Board size
3.2 in.
× 3.2 in.
Board material
FR4
Copper trace/heat sink
1 oz
Exposed pad mounting
63/67 tin/lead solder
Heat-Sink Area
1 oz Copper
Figure 28. PWB Layout (Including Copper Heatsink Area) for Thermally Enhanced PWP Package
From Figure 26, RθJA for a PWB assembly can be determined and used to calculate the maximum power-dissipation
limit for the component/PWB assembly, with the equation:
P
D(max) +
T
J
max
* T
A
RqJA(system)
Where:
(5)
TJmax is the maximum specified junction temperature (150°C absolute maximum limit, 125°C recommended
operating limit) and TA is the ambient temperature.
PD(max) should then be applied to the internal power dissipated by the TPS75233QPWPEP regulator. The equation
for calculating total internal power dissipation of the TPS75233QPWPEP is:
P
D(total) +
V
I *
V
O
I
O )
V
I
Q
(6)
Since the quiescent current of the TPS75233QPWPEP is very low, the second term is negligible, further simplifying
the equation to:
P
D(total) +
V
I *
V
O
I
O
(7)
For the case where TA = 55°C, airflow = 200 ft/min, copper heat-sink area = 4 cm2, the maximum power-dissipation
limit can be calculated. First, from Figure 26, we find the system RθJA is 50°C/W; therefore, the maximum
power-dissipation limit is:
P
D(max) +
T
J
max
* T
A
RqJA(system)
+ 125 C * 55 C
50 C W
+ 1.4 W
°
°°
(8)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS75425QPWPRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75433QPWP | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75433QPWPG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75433QPWPR | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75433QPWPRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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