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參數(shù)資料
| 型號： | TC1142-5.0EUA |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 48K |
| 代理商： | TC1142-5.0EUA |
TC1142
TC1142-2
12/6/99 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
FEATURES
s
Input Range 2.5V to 5.5V
s
Regulated Output Options from –3.0 to –5.0V
s
Output Current 20 mA (max)
s
200 KHz Internal Oscillator Frequency
s
External Synchronizing Clock Input
s
Logic Level Shutdown .. ........... 1
A (max) Supply
Current
s
8-Pin MSOP Package
TYPICAL APPLICATIONS
s
Cellular Phones
s
Battery Powered/Portable Equipment
GENERAL DESCRIPTION
The TC1142 generates a regulated negative voltage
from –3V to –5V at 20 mA 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
A. When CCLK is pulled high, the part runs
from the internal 200 KHz oscillator. The device may be run
with an external clock, provided the frequency is greater
than 3 KHz and less than 500 KHz.
The TC1142 comes in a space-saving MSOP package.
TYPICAL APPLICATION
PIN CONFIGURATION
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC1142-3.0EUA
8-Pin MSOP
–40
°C to 85°C
TC1142-4.0EUA
8-Pin MSOP
–40
°C to 85°C
TC1142-5.0EUA
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
Note: Contact factory for availability of –3.5 and –4.5V options.
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
TC1142-30
CCLK
VOUT = –3.0V
GND
VIN
5.5V to 3V
0.47
FC1
C2–
4.7
F
VOUT
ON
OSC
OVERRIDE
OFF
–1x Buck
COUT
Inductorless –2x Boost/Buck Regulator
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