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參數資料
| 型號： | TC1142-50EUA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Inductorless -2x Boost/Buck Regulator |
| 中文描述： | 電感- 2x升壓/降壓穩壓器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 419K |
| 代理商： | TC1142-50EUA |
2002 Microchip Technology Inc.
DS21360B-page 1
M
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
μ
A (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 V
OUT
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 C
OUT
in order to reduce
the ripple generated from regulating V
OUT
in this
manner. The TC1142 also can be used as a -1x buck
regulator by omitting C2, and connecting the C2 pin to
V
OUT
.
The part goes into shutdown when the CCLK input is
driven low. When in shutdown mode, the part draws a
maximum of 1
μ
A. 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
TC1142-4.0EUA
TC1142-5.0EUA
3.0
4.0
5.0
8-Pin MSOP
-40
°
C to +85
°
C
8-Pin MSOP -40
°
C to +85
°
C
8-Pin MSOP -40
°
C to +85
°
C
GND
C2–
1
2
3
4
8
7
6
5
TC1142
8-Pin MSOP
C2+
V
OUT
C1
–
V
IN
C1+
CCLK
TC1142-50
CCLK
V
OUT
= -5.0V
GND
V
IN
5.5V to 2.5V
0.47
μ
F
0.47
μ
F
C1
C2
4.7
μ
F
C
OUT
V
OUT
ON
OSC
OVERRIDE
OFF
–
2x Boost/Buck
+
–
TC1142-30
CCLK
V
OUT
=
–
3.0V
GND
V
IN
5.5V to 3V
0.47
μ
F
C1
C2
–
4.7
μ
F
C
OUT
V
OUT
OSC
OVERRIDE
–
1x Buck
ON OFF
+
–
Inductorless -2x Boost/Buck Regulator
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