參數(shù)資料
型號： TPS75518KTTR
元件分類： 基準電壓源/電流源
英文描述： THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
中文描述： 三端固定電壓調(diào)節(jié)器
文件頁數(shù)： 24/27頁
文件大?。?/td> 398K
代理商： TPS75518KTTR
TPS75101-Q1,
’
75115-Q1,
’
75118-Q1,
’
75125-Q1,
’
75133-Q1 WITH POWER GOOD
TPS75301-Q1, TPS75315-Q1, TPS75318-Q1, TPS75325-Q1, TPS75333-Q1 WITH RESET
FAST-TRANSIENT-RESPONSE 1.5-A LOW-DROPOUT VOLTAGE REGULATORS
SGLS159
–
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. 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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參數(shù)描述
TPS75518KTTRG3 功能描述:低壓差穩(wěn)壓器 - LDO 1.8-Volt 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75518KTTT 功能描述:低壓差穩(wěn)壓器 - LDO 1.8-Volt 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75518KTTTG3 功能描述:低壓差穩(wěn)壓器 - LDO 1.8-Volt 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75525EVM 功能描述:電源管理IC開發(fā)工具 TPS75525EVM Vltg Reg Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS75525KC 功能描述:低壓差穩(wěn)壓器 - LDO 2.5-Volt 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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