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參數(shù)資料
| 型號(hào)： | SPX1117M3-L-1-5 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 800mA Low Dropout Voltage Regulator |
| 中文描述： | 800mA的低壓差穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 470K |
| 代理商： | SPX1117M3-L-1-5 |
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7
Apr 20-07 Rev B SPX1117 800mA Low Dropout Voltage Regulator
2007 Sipex Corporation
Thermal Characteristics
The thermal resistance of SPX1117 (SOT-223
Package) is 15
°
C/W from junction to tab and 31
°
C/W from tab to ambient for a total of 46
°
C/W
from junction to ambient (Table 1). The SPX1117
features the internal thermal limiting to protect
the device during overload conditions. Special
care needs to be taken during continuous load
conditions such that the maximum junction tem-
perature does not exceed 125
°
C. Thermal pro-
tection is activated at >155
°
C and deactiviated
at <140
°
C.
Taking the FR-4 printed circuit board and 1/16
thick with 1 ounce copper foil as an experiment
(fig.13), the PCB material is effective at trans-
mitting heat with the tab attached to the pad area
and a ground plane layer on the backside of the
substrate. Refer to table 1 for the results of the
experiment.
The thermal interaction from other components
in the application can effect the thermal resis-
tance of the SPX1117. The actual thermal
resistance can be determined with experimenta-
tion.
SPX1117 power dissipation is calculated as
follows:
P
= (V
- V
)(I
)
Maximum Junction Temperature range:
T
= T
(max) + P
D
* thermal resistance
(junction-to-ambient)
Maximum junction temperature must not ex-
ceed the 125
°
C.
Ripple Rejection
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 23. When ADJ pin bypassing
is used, the value of the output capacitor re-
quired increases to its maximum. If the ADJ pin
is not bypassed, the value of the output capacitor
can be lowered to 10
μ
F for an electrolytic alu-
minum capacitor or 2.2
μ
F for a ceramic or solid
tantalum capacitor (Fig 22).
However the value of the ADJ-bypass capacitor
should be chosen with respect to the following
equation:
C = 1 / ( 6.28 * F
R
* R
1
)
Where
C = value of the capacitor in Farads
(select an equal or larger standard value),
F
R
= ripple frequency in Hz,
R
1
= value of resistor R1 in Ohms.
If an ADJ-bypass capacitor is used, the ampli-
tude of the output ripple will be independent of
the output voltage. If an ADJ-bypass capacitor
is not used, the output ripple will be proportional
to the ratio of the output voltage to the reference
voltage:
M = V
OUT
/ V
REF
Where M = multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
V
REF
=1.25V
Ripple rejection for the adjustable version is
shown in Figure 20.
Figure 19. Substrate Layout for SOT-223
50 X 50mm
35 X 17mm
16 X 10mm
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
100
1000
10000
100000
1000000
Frequency, Hz
R
Figure 20. Ripple Rejection; Vin=3.3V, Vout=1.8V
(adj.), Iload=200mA
APPLICATION INFORMATION: Continued
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SPX1117M3-L-1-8 | 800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-2-5 | 800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-2-85 | 800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-3-0 | 800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-3-3 | 800mA Low Dropout Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX1117M3-L-1-5/TR | 功能描述:低壓差穩(wěn)壓器 - LDO 800mALOW DROPOUT 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SPX1117M3-L-1-8 | 功能描述:低壓差穩(wěn)壓器 - LDO 800mALOW DROPOUT 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SPX1117M3-L-1-8 | 制造商:Exar Corporation 功能描述:Regulator |
| SPX1117M3-L-1-8/TR | 功能描述:低壓差穩(wěn)壓器 - LDO 800mALOW DROPOUT 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SPX1117M3-L-2-5 | 功能描述:低壓差穩(wěn)壓器 - LDO 800mALOW DROPOUT 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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