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參數(shù)資料
| 型號(hào)： | SPX1117M3-2.85 |
| 元件分類： | 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PDSO3 |
| 封裝： | SOT-223, 3 PIN |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 689K |
| 代理商： | SPX1117M3-2.85 |
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7
Oct24-07 Rev D
SPX7 800mA Low Dropout Regulator
Copyright 2007 Sipex Corporation
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
fromjunctiontoambient(Table1).TheSPX1117
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
D = (VIN - VOUT)(IOUT)
Maximum Junction Temperature range:
T
J = TA(max) + PD* 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 10F for an electrolytic alu-
minum capacitor or 2.2F 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 * R1 )
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 / VREF
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
Ripple
Rejection,
Db
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 |
|---|---|
| SPX2808M1-3.3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3 |
| SPX2808M1-3.5 | 3.5 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3 |
| SPX2954ACN-3.3 | 3.3 V FIXED POSITIVE LDO REGULATOR, PBCY3 |
| SPX385BM1-5-0 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PSSO3 |
| SPX385N-1.2/TR | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PBCY3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX1117M3-3.0 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:800mA Low Dropout Regulator |
| SPX1117M3-3.0/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:800mA Low Dropout Voltage Regulator |
| SPX1117M3-3.3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:800mA Low Dropout Regulator |
| SPX1117M3-3.3/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:800mA Low Dropout Voltage Regulator |
| SPX1117M3-3-0 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:800mA Low Dropout Voltage Regulator |
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