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參數(shù)資料
| 型號： | 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)： | 1/12頁 |
| 文件大小： | 246K |
| 代理商： | TC1142-4.0EUATR |
2005 Microchip Technology Inc.
DS21360C-page 1
TC1142
Features
Input Range 2.5V to 5.5V
Regulated Output Options from -3.0 to -5.0V
Output Current 20mA (max)
200kHz Internal Oscillator Frequency
External Synchronizing Clock Input
Logic Level Shutdown
-1
μA (max) Supply Current
Available in 8-Pin MSOP Package
Applications
Cellular Phones
Battery Powered/Portable Equipment
Device Selection Table
*Other output voltages are available (-3.5V and -4.5V). Please
contact Microchip Technology Inc. for details.
Package Type
General Description
The TC1142 generates a regulated negative voltage
from -3V to -5V at 20mA from an input of 2.5V to 5.5V,
using only three external capacitors. Other boost/buck
switching regulators must use an inductor, which is
larger
and
radiates
EMI.
An
internal
voltage
comparator inhibits the charge pump when VOUT is
more negative than the regulated value (per the
ordering option). The values of flying capacitors C1 and
C2 are chosen to be less than COUT in order to reduce
the ripple generated from regulating VOUT in this
manner. The TC1142 also can be used as a -1x buck
regulator by omitting C2, and connecting the C2 pin to
VOUT.
The part goes into shutdown when the CCLK input is
driven low. When in shutdown mode, the part draws a
maximum of 1
μA. When CCLK is pulled high, the part
runs from the internal 200kHz oscillator. The device
may be run with an external clock, provided the
frequency is greater than 3kHz and less than 500kHz.
The TC1142 comes in a space-saving MSOP package.
Functional Block Diagram
Part
Number
Output
Voltage
(V)*
Package
Operating
Temp.
Range
TC1142-3.0EUA
3.0
8-Pin MSOP -40°C to +85°C
TC1142-4.0EUA
4.0
8-Pin MSOP -40°C to +85°C
TC1142-5.0EUA
5.0
8-Pin MSOP -40°C to +85°C
GND
C2–
1
2
3
4
8
7
6
5
TC1142
8-Pin MSOP
C2+
VOUT
C1–
VIN
C1+
CCLK
TC1142-50
CCLK
VOUT = -5.0V
GND
VIN
5.5V to 2.5V
0.47
F
0.47
F
C1
C2
4.7
F
VOUT
ON
OSC
OVERRIDE
OFF
–2x Boost/Buck
COUT
+
–
TC1142-30
CCLK
VOUT = –3.0V
GND
VIN
5.5V to 3V
0.47
FC1
C2–
4.7
F
VOUT
OSC
OVERRIDE
–1x Buck
COUT
ON OFF
+
–
Inductorless -2x Boost/Buck Regulator
Obsolete Device
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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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