Datasheet

 2002-2012 Microchip Technology Inc. DS21373C-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, V
OUT
remains stable and within regulation over the entire
0mA to I
LOADMAX
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
A 1F (min) capacitor from V
OUT
to ground is required.
The output capacitor should have an effective series
resistance greater than 0.1 and less than 5, and a
resonant frequency above 1MHz. A 1F capacitor
should be connected from V
IN
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.
Pin No.
(3-Pin SOT-223)
(3-Pin TO-220)
(3-Pin DDPAK)
Symbol Description
1V
IN
Unregulated supply input.
2 GND Ground terminal.
3V
OUT
Regulated voltage output.
C1
1μF
Battery
TC1262
V
IN
V
OUT
C2
1μF
GND
V
OUT
+
+
+
–