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參數(shù)資料
| 型號： | TPS79628KTTR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ULTRALOW-NOISE, HIGH PSRR, FAST RF 1-A LOW-DROPOUT LINEAR REGULATORS |
| 中文描述： | 超低噪聲，高PSRR，快速射頻1 -低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 560K |
| 代理商： | TPS79628KTTR |
www.ti.com
0
0.1
100
120
140
160
180
PCB Copper Area in
2
J
R
C
°
No Air Flow
80
60
40
20
1
10
1
0.1
2
3
4
5
1
10
100
Copper Heatsink Area cm
2
T
A
= 55
°
C
No Air Flow
150 LFM
250 LFM
P
D
SOT223 Power Dissipation
The SOT223 package provides an effective means of
managing power dissipation in surface mount appli-
cations. The SOT223 package dimensions are pro-
vided in the
Mechanical Data
section at the end of
the data sheet. The addition of a copper plane
directly underneath the SOT223 package enhances
the thermal performance of the package.
P
D
max
(3.3
2.5) V x 1 A
800 mW
(10)
R
θ
JAmax
(125
55)
°
C 800 mW
87.5
°
C W
0
1
2
3
6
0
25
50
75
100
150
125
T
A
= 25
°
C
T
A
(
°
C)
4
5
4 in
2
PCB Area
0.5 in
2
PCB Area
P
D
TPS79601, TPS79618, TPS79625
TPS79628, TPS79630, TPS79633
SLVS351D–SEPTEMBER 2002–REVISED OCTOBER 2004
Figure 28. SOT223 Thermal Resistance vs PCB
Area
Figure 27. Maximum Power Dissipation vs Copper
Heatsink Area
From
Equation 6, the maximum power dissipation for a
different ground plane area and a specific ambient
temperature can be computed (see Figure 29).
the
data
in
Figure
28
and
rearranging
To illustrate, the TPS72525 in a SOT223 package
was chosen. For this example, the average input
voltage is 3.3 V, the output voltage is 2.5 V, the
average output current is 1 A, the ambient tempera-
ture 55
°
C, no air flow is present, and the operating
environment is the same as documented below.
Neglecting the quiescent current, the maximum aver-
age power is calculated as Equation 10:
Substituting T
J
max for T
J
into Equation 6 gives
Equation 11:
(11)
From Figure 28, R
Θ
JA
vs PCB Copper Area, the
ground plane needs to be 0.55 in
2
for the part to
dissipate 800 mW. The operating environment used
to construct Figure 28 consisted of a board with 1 oz.
copper planes. The package is soldered to a 1 oz.
copper pad on the top of the board. The pad is tied
through thermal vias to the 1 oz. ground plane.
Figure 29. SOT223 Power Dissipation
13
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| TPS79628KTTRG3 | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 1A 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(fù)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 |
| TPS79628KTTT | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 1A 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(fù)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 |
| TPS79628KTTTG3 | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 1A 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(fù)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 |
| TPS79630DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 1A 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(fù)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 |
| TPS79630DCQG4 | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 1A 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(fù)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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