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PDF TC1142 Data sheet ( Hoja de datos )
| Número de pieza | TC1142 | |
| Descripción | Inductorless -2x Boost/Buck Regulator | |
| Fabricantes | Microchip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC1142 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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M
TC1142
Inductorless -2x Boost/Buck Regulator
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
- 1µA (max) Supply Current
• Available in 8-Pin MSOP Package
Applications
• Cellular Phones
• Battery Powered/Portable Equipment
Device Selection Table
Part
Number
Output
Voltage Package
(V)*
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
*Other output voltages are available (-3.5V and -4.5V). Please
contact Microchip Technology Inc. for details.
Functional Block Diagram
+
– 5.5V to 2.5V
ON OFF
VIN
CCLK
VOUT
OSC 0.47µF C1 TC1142-50
OVERRIDE
–2x Boost/Buck
VOUT = -5.0V
4.7µF
COUT
0.47µF C2
GND
Package Type
8-Pin MSOP
VOUT 1
C2– 2
C2+ 3
C1– 4
TC1142
8 CCLK
7 VIN
6 C1+
5 GND
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 1µA. 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.
+
– 5.5V to 3V
ON OFF
VIN
CCLK
VOUT
OSC 0.47µF C1 TC1142-30
OVERRIDE
C2–
GND
–1x Buck
VOUT = –3.0V
4.7µF
COUT
2002 Microchip Technology Inc.
DS21360B-page 1
1 page  
FIGURE 3-2:
TC1142 PHASE 1
(a)
C1+
TC1142
VIN
C1–
C2+
VIN
C2–
VOUT
+ COUT
(b) VIN
C2+
C1–
C2–
C1+
(a) Switch positions during phase 1.
(b) The equivalent circuit of the charging phase of operation.
C1+
+ COUT
VOUT
FIGURE 3-3:
TC1142 PHASE 2
(a)
C1+
VIN
C1–
C2+
VIN
C2–
(b)
VIN
C1+ C2–
C2+
C1–
VOUT
+ COUT
(a) Switch positions during phase 2.
(b) The equivalent circuit of the discharging phase of operation.
VOUT
+ COUT
2002 Microchip Technology Inc.
DS21360B-page 5
5 Page 
TC1142
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
2002 Microchip Technology Inc.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21360B-page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1142.PDF ] | |
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