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參數(shù)資料
| 型號： | TC2117-1.8EB |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 800 mA Fixed Low Dropout Positive Regulator |
| 中文描述： | 800毫安固定低壓差穩(wěn)壓器正 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 751K |
| 代理商： | TC2117-1.8EB |
2006 Microchip Technology Inc.
DS21665C-page 7
TC2117
4.0
DETAILED DESCRIPTION
The TC2117 is a precision, positive output LDO. Unlike
bipolar regulators, the TC2117 supply current does not
increase proportionally with load current. In addition,
V
OUT
remains stable and within regulation over the
entire 0 mA to 800 mA operating load range.
FIGURE 4-1:
TYPICAL APPLICATION
CIRCUIT
4.1
Output Capacitor
A 1 μF (min) capacitor from V
OUT
to ground is required.
The output capacitor should have an effective series
resistance of 0.2
Ω
to 10
Ω
. A 1 μF capacitor should be
connected from V
IN
to GND if there is more than 10
inches of wire between the regulator and the AC filter
capacitor, or if a battery is used as the power source.
Aluminum electrolytic or tantalum capacitor types can
be used. (Since many aluminum electrolytic capacitors
freeze at approximately -30°C, solid tantalums are
recommended for applications operating below -25°C.)
When operating from sources other than batteries,
supply noise rejection and transient response can be
improved by increasing the value of the input and
output capacitors and employing passive filtering
techniques.
4.2
Thermal Considerations
4.2.1
THERMAL SHUTDOWN
Integrated thermal protection circuitry shuts the regula-
tor off when die temperature exceeds 160°C. The
regulator remains off until the die temperature drops to
approximately 150°C.
4.2.2
POWER DISSIPATION
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output
current. The following equation is used to calculate
worst case actual power dissipation:
EQUATION 4-1:
The
(
Equation 4-2
) is a function of the maximum ambient
temperature (T
A
MAX
), the maximum allowable die
temperature (+125°C) and the thermal resistance from
junction-to-air (
θ
JA
).
maximum
allowable
power
dissipation
EQUATION 4-2:
Table 4-1
shows various values of
θ
JA
for the TC2117
mounted on a 1/16 inch, 2-layer PCB with 1 oz. copper
foil.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC2117 IN
3-PIN SOT-223 PACKAGE
C
1μF
Battery
TC2117
V
IN
V
OUT
C
2
1μF
GND
V
OUT
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board Area
Thermal
Resistance
2500 sq mm
2500 sq mm
2500 sq mm
45°C/W
1000 sq mm
2500 sq mm
2500 sq mm
45°C/W
225 sq mm
2500 sq mm
2500 sq mm
53°C/W
100 sq mm
2500 sq mm
2500 sq mm
59°C/W
1000 sq mm
1000 sq mm
1000 sq mm
52°C/W
1000 sq mm
0 sq mm
1000 sq mm
55°C/W
* Tab of device attached to topside copper.
Where:
V
INMAX
V
OUTMIN
I
LOADMAX
P
D
= Worst-case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
D
V
INMAX
V
OUTMIN
–
(
)
I
LOADMAX
=
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
Where all terms are previously defined.
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| TC2117-3.3EDTR | 800 mA Fixed Low Dropout Positive Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC2117-2.5DB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:800 mA Fixed Low Dropout Positive Regulator |
| TC2117-2.5DBTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:800 mA Fixed Low Dropout Positive Regulator |
| TC2117-2.5EB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:800 mA Fixed Low Dropout Positive Regulator |
| TC2117-2.5EDTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:800 mA Fixed Low Dropout Positive Regulator |
| TC2117-2.5VDBTR | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA Fixed Output 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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