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參數(shù)資料
| 型號(hào)： | TC1142-4.0EUATR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 246K |
| 代理商： | TC1142-4.0EUATR |
2005 Microchip Technology Inc.
DS21360C-page 7
TC1142
TABLE 3-2:
LOW ESR SURFACE-MOUNT
CAPACITOR
MANUFACTURERS
3.3
Power Efficiency
Assuming the output is loaded with at least 20% of the
maximum available output current, the power efficiency
of the TC1142 can be estimated using the following
equation:
EQUATION 3-5:
For example, a 3.2 Volt VIN, and a -5 Volt VR will have
an efficiency of approximately 78%. For loads less than
20% of the maximum available output current, the
power efficiency will be substantially reduced. Other
factors that affect the actual efficiency include:
1.
Losses from power consumed by the internal
oscillator (if used).
2.
I2R losses due to the on-resistance of the
MOSFET charge pump switches.
3.
Charge pump capacitor losses due to ESR.
4.
Losses that occur during charge transfer (from
the flying capacitors to the output capacitor)
when a voltage difference exists between these
capacitors.
3.4
Choice of -2x or -1x Connections
If required output voltage can be achieved using a -1x
configuration then this is preferred for the following
reasons:
1.
Power efficiency is improved from VR/2VIN to
VR/VIN
2.
Only one flying capacitor needed
3.
The output ripple becomes proportional to
VIN – VR rather than 2 VIN – VR.
3.5
Layout Considerations
Proper layout is important to obtain optimal perfor-
mance. Mount capacitors as close to their connecting
device pins as possible to minimize stray inductance
and capacitance. It is recommended that a large
ground plane be used to reduce noise leakage into
other circuitry.
FIGURE 3-4:
TIMING DIAGRAM
Manufacturer
Type
Phone
AVX Corp.
TPS series surface-mount
tantalum
X7R type surface-mount
ceramic
803-448-9411
Matsuo
267 series surface-mount
tantalum
X7R type surface-mount
ceramic
714-969-2491
Sprague
593D, 594D, 595D series
surface-mount tantalum
207-324-4140
Murata
Ceramic chip capacitors
800-831-9172
Taiyo Yuden
Ceramic chip capacitors
800-348-2496
Tokin
Ceramic chip capacitors
408-432-8020
η = |VR|
2(VIN)
CCLK
VOUT
–VR
Internal
Oscillator
Shutdown
External
Clock
Shutdown
t0 = counter timeout (~160 sec)
t0
VIL
GND
VIH
t0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1142-5.0EUA | 功能描述:電荷泵 -2xBoost/Buck RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TC1142-5.0EUATR | 功能描述:電荷泵 -2xBoost/Buck RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TC1142-50EUA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inductorless -2x Boost/Buck Regulator |
| TC114A | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.25inch Steel |
| TC114A-RT | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.25inch Male Steel |
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