參數(shù)資料
型號(hào)： TPS75333Q
廠商： Texas Instruments, Inc.
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： FAST-TRANSIENT-RESPONSE 1.5-A LOW-DROPOUT VOLTAGE REGULATORS
中文描述： 快速瞬態(tài)響應(yīng)1.5低壓差電壓調(diào)節(jié)器
文件頁(yè)數(shù)： 24/29頁(yè)
文件大?。?/td> 449K
代理商： TPS75333Q
TPS75101Q, TPS75115Q, TPS75118Q, TPS75125Q, TPS75133Q WITH POWER GOOD
TPS75301Q, TPS75315Q, TPS75318Q, TPS75325Q, TPS75333Q WITH RESET
FAST-TRANSIENT-RESPONSE 1.5-A LOW-DROPOUT VOLTAGE REGULATORS
SLVS241B
–
MARCH 2000
–
REVISED JUNE 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. R
θ
JA
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
Board size
Board material
Copper trace/heat sink
Exposed pad mounting
62 mils
3.2 in.
×
3.2 in.
FR4
1 oz
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, R
θ
JA
for a PWB assembly can be determined and used to calculate the maximum
power-dissipation limit for the component/PWB assembly, with the equation:
PD(max)
TJmax
RJA(system)
TA
Where:
(5)
T
J
max is the maximum specified junction temperature (150
°
C absolute maximum limit, 125
°
C recommended
operating limit) and T
A
is the ambient temperature.
P
D(max)
should then be applied to the internal power dissipated by the TPS75133QPWP regulator. The equation
for calculating total internal power dissipation of the TPS75133QPWP is:
PD(total)
VI
VO
IO
VI
IQ
(6)
Since the quiescent current of the TPS75133QPWP is very low, the second term is negligible, further simplifying
the equation to:
PD(total)
VI
VO
IO
(7)
For the case where T
A
= 55
°
C, airflow = 200 ft/min, copper heat-sink area = 4 cm
2
, the maximum
power-dissipation limit can be calculated. First, from Figure 26, we find the system R
θ
JA
is 50
°
C/W; therefore,
the maximum power-dissipation limit is:
PD(max)
TJmax
RJA(system)
TA
125 C
50 C W
55 C
1.4 W
(8)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS75333QPWP 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75333QPWP 制造商:Texas Instruments 功能描述:V REG +3.3V SMD 75333 TSSOP20
TPS75333QPWPG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75333QPWPR 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75333QPWPREP 功能描述:低壓差穩(wěn)壓器 - LDO Mil Enh Fast-Trans Resp 1.5A LDO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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