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PDF TC1268 Data sheet ( Hoja de datos )
| Número de pieza | TC1268 | |
| Descripción | 500mA Fixed Output / Fast Response CMOS LDO with Shutdown | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC1268
500mA Fixed Output, Fast Response CMOS LDO with Shutdown
Features
• Very Low Dropout Voltage
• 500mA Output Current
• High Output Voltage Accuracy
• Standard or Custom Output Voltages
• Over Current and Over Temperature Protection
• SHDN Input for Active Power Management
• ERROR Output to Detect Low Battery
• 5µsec (typical) Wake-up Time from SHDN
Applications
• RAMBUS Memory Module
• Battery-Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulator for SMPS
• Pagers
• Digital Cameras
Device Selection Table
Output*
Part Number Voltage Package
(V)
Junction
Temp. Range
TC1268-2.5VOA 2.5 8-Pin SOIC -40°C to +125°C
*Other output voltages and package options are available.
Please contact Microchip Technology Inc. for details.
Package Type
8-Pin SOIC
VOUT 1
GND 2
NC 3
BYPASS 4
TC1268
8 VIN
7 NC
6 SHDN
5 ERROR
General Description
The TC1268 is a fixed output, fast turn-on, high
accuracy (typically ±0.5%) CMOS low dropout
regulator. Designed specifically for battery-operated
systems, the TC1268’s CMOS construction eliminates
wasted ground current, significantly extending battery
life. Total supply current is typically 80µA at full load (20
to 60 times lower than in bipolar regulators).
TC1268’s key features include ultra low noise, very low
dropout voltage (typically 350mV at full load), and
fast response to step changes in load. The TC1268
also has a fast wake-up response time (5µsec typically)
when released from shutdown. The TC1268
incorporates both over temperature and over current
protection. The TC1268 is stable with an output
capacitor of only 1µF and has a maximum output
current of 500mA.
Typical Application
VIN VIN
VOUT +
VOUT
TC1268
COUT
1µF
GND
SHDN
SHDN
© 2002 Microchip Technology Inc.
DS21379B-page 1
1 page  
3.2 Bypass Input
A 10nF capacitor connected from the bypass input to
ground reduces noise present on the internal
reference, which in turn, significantly reduces output
noise. If output noise is not a concern, this input may be
left unconnected. Larger capacitor values may be
used, but this results in a longer time period to achieve
the rated output voltage, once power is initially applied.
3.3 Output Capacitor
A 1µF (min) capacitor from VOUT to ground is required.
The output capacitor should have an effective series
resistance greater than 0.1Ω and less than 5Ω, and a
resonant frequency above 1MHz. A 1µF capacitor
should be connected from VIN to GND if there is more
than 10 inches of wire between the regulator and the
AC filter capacitor, or if a battery is used as the power
source. Aluminum electrolytic or tantalum capacitor
types can be used. (Since many aluminum electrolytic
capacitors freeze at approximately -30°C, solid
tantalums are recommended for applications operating
below -25°C.) When operating from sources other than
batteries, supply noise rejection and transient
response can be improved by increasing the value of
the input and output capacitors and employing passive
filtering techniques.
TC1268
3.4 ERROR Output
ERROR is driven low whenever VOUT falls out of
regulation by more than -5% (typical). This condition
may be caused by low input voltage, output current
limiting, or thermal limiting.
The ERROR threshold is 5% below rated VOUT,
regardless of the programmed output voltage value
(e.g., ERROR = VOL at 2.375V (typ.) for a 2.5V
regulator). ERROR output operation is shown in
Figure 3-3. Note that ERROR is active when VOUT is at
or below VTH, and inactive when VOUT is above VTH +
VH.
As shown in Figure 3-1, ERROR can be used as a
battery low flag, or as a processor RESET signal (with
the addition of timing capacitor C1). R1 x C1 should be
chosen to maintain ERROR below VIH of the processor
RESET input for at least 200msec to allow time for the
system to stabilize. Pull-up resistor R1 can be tied to
VOUT, VIN or any other voltage less than (VIN + 0.3V).
FIGURE 3-3:
VOUT
ERROR OUTPUT
OPERATION
VTH Hysteresis (VH)
ERROR
VIH
VOL
© 2002 Microchip Technology Inc.
DS21379B-page 5
5 Page 
TC1268
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, MXLAB, 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.
DS21379B-page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1268.PDF ] | |
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