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TC1142-4.0EUART

Description
SWITCHED CAPACITOR REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8
CategoryPower/power management    The power supply circuit   
File Size59KB,7 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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TC1142-4.0EUART Overview

SWITCHED CAPACITOR REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8

TC1142-4.0EUART Parametric

Parameter NameAttribute value
MakerMicrochip
Parts packaging codeMSOP
package instruction,
Contacts8
Reach Compliance Codeunknown
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHED CAPACITOR REGULATOR
Maximum input voltage5.5 V
Minimum input voltage2.5 V
Nominal input voltage3.5 V
JESD-30 codeS-PDSO-G8
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
Package shapeSQUARE
Package formSMALL OUTLINE
Certification statusNot Qualified
surface mountYES
Switch configurationDOUBLER INVERTER
Maximum switching frequency500 kHz
Temperature levelINDUSTRIAL
Terminal formGULL WING
Terminal locationDUAL
TC1142
Inductorless –2x Boost/Buck Regulator
FEATURES
s
s
s
s
s
s
s
Input Range 2.5V to 5.5V
Regulated Output Options from –3.0 to –5.0V
Output Current 20 mA (max)
200 KHz Internal Oscillator Frequency
External Synchronizing Clock Input
Logic Level Shutdown ... ........... 1
µ
A (max) Supply
Current
8-Pin MSOP Package
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 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
µA.
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 APPLICATIONS
s
s
Cellular Phones
Battery Powered/Portable Equipment
TYPICAL APPLICATION
–2x Boost/Buck
5.5V to 2.5V
ON OFF
V
IN
CCLK
OSC
OVERRIDE
V
OUT
V
OUT
= –5.0V
4.7
µF
C
OUT
ORDERING INFORMATION
Part No.
TC1142-3.0EUA
TC1142-4.0EUA
TC1142-5.0EUA
Package
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Temp. Range
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0.47
µF
C1
TC1142-50
0.47
µF
C2
GND
Note: Contact factory for availability of –3.5 and –4.5V options.
PIN CONFIGURATION
–1x Buck
5.5V to 3V
ON OFF
V
IN
CCLK
OSC
OVERRIDE
V
OUT
V
OUT
= –3.0V
4.7
µF
C
OUT
8-Pin MSOP
V
OUT
1
C2– 2
C2+ 3
C1– 4
TC1142
6
5
8
7
CCLK
V
IN
C1+
GND
0.47
µF
C1
TC1142-30
C2–
GND
© 2001 Microchip Technology Inc.
DS21360A
TC1142-2
12/6/99

TC1142-4.0EUART Related Products

TC1142-4.0EUART TC1142-3.0EUART
Description SWITCHED CAPACITOR REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8 SWITCHED CAPACITOR REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8
Maker Microchip Microchip
Parts packaging code MSOP MSOP
Contacts 8 8
Reach Compliance Code unknown unknown
ECCN code EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHED CAPACITOR REGULATOR SWITCHED CAPACITOR REGULATOR
Maximum input voltage 5.5 V 5.5 V
Minimum input voltage 2.5 V 2.5 V
Nominal input voltage 3.5 V 3.5 V
JESD-30 code S-PDSO-G8 S-PDSO-G8
Number of functions 1 1
Number of terminals 8 8
Maximum operating temperature 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
Package shape SQUARE SQUARE
Package form SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Certification status Not Qualified Not Qualified
surface mount YES YES
Switch configuration DOUBLER INVERTER DOUBLER INVERTER
Maximum switching frequency 500 kHz 275 kHz
Temperature level INDUSTRIAL INDUSTRIAL
Terminal form GULL WING GULL WING
Terminal location DUAL DUAL
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