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TC1142-50EUA Datasheet

  • TC1142-50EUA

  • Inductorless -2x Boost/Buck Regulator

  • 12頁(yè)

  • MICROCHIP   MICROCHIP

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M
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
TC1142
Package Type
8-Pin MSOP
V
OUT
1
C2鈥?2
C2+
3
8
CCLK
V
IN
C1+
GND
Inductorless -2x Boost/Buck Regulator
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碌A(chǔ) (max) Supply Current
鈥?Available in 8-Pin MSOP Package
TC1142
7
6
5
C1鈥?4
Applications
鈥?Cellular Phones
鈥?Battery Powered/Portable Equipment
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碌A(chǔ). 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.
Device Selection Table
Part
Number
TC1142-3.0EUA
TC1142-4.0EUA
TC1142-5.0EUA
Output
Voltage
(V)*
3.0
4.0
5.0
Package
Operating
Temp.
Range
8-Pin MSOP -40擄C to +85擄C
8-Pin MSOP -40擄C to +85擄C
8-Pin MSOP -40擄C to +85擄C
*Other output voltages are available (-3.5V and -4.5V). Please
contact Microchip Technology Inc. for details.
Functional Block Diagram
+
鈥?/div>
ON OFF
V
IN
CCLK
V
OUT
4.7碌F
C
OUT
OSC
OVERRIDE
0.47碌F
C1
V
OUT
= -5.0V
5.5V to 2.5V
ON OFF
V
IN
CCLK
V
OUT
4.7碌F
C
OUT
V
OUT
= 鈥?.0V
鈥?x Boost/Buck
+
鈥?/div>
5.5V to 3V
鈥?x Buck
OSC
OVERRIDE
0.47碌F
C1
TC1142-50
TC1142-30
C2鈥?/div>
0.47碌F
C2
GND
GND
錚?/div>
2002 Microchip Technology Inc.
DS21360B-page 1

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