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TC1262-XXVAB Datenblatt(PDF) 3 Page - Microchip Technology

Teilenummer TC1262-XXVAB
Bauteilbeschribung  500mA Fixed Output CMOS LDO
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© 2002 Microchip Technology Inc.
DS21373B-page 3
TC1262
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
3.0
DETAILED DESCRIPTION
The TC1262 is a precision, fixed output LDO. Unlike
bipolar regulators, the TC1262’s supply current does
not increase with load current. In addition, VOUT
remains stable and within regulation over the entire
0mA to ILOADMAX load current range (an important
consideration in RTC and CMOS RAM battery back-up
applications).
Figure 3-1 shows a typical application circuit.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
Output Capacitor
A1
µF (min) capacitor from VOUT to ground is required.
The output capacitor should have an effective series
resistance greater than 0.1
Ω and less than 5Ω,and a
resonant frequency above 1MHz. A 1
µF 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 canbeimprovedbyincreasingthe valueof
the input and output capacitors and employing passive
filtering techniques.
Pin No.
(3-Pin SOT-223)
(3-Pin TO-220)
(3-Pin DDPAK)
Symbol
Description
1VIN
Unregulated supply input.
2
GND
Ground terminal.
3VOUT
Regulated voltage output.
C1
1
µF
Battery
TC1262
VIN
VOUT
C2
1
µF
GND
VOUT
+
+
+


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