TC1262-3.3VDBTR Datasheet, PDF (3/12 Pages) Microchip Technology – 500mA Fixed Output CMOS LDO

2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(3-Pin SOT-223)
(3-Pin TO-220)
(3-Pin DDPAK)
1
2
3
Symbol
V_IN
GND
V_OUT
Unregulated supply input.
Ground terminal.
Regulated voltage output.
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
Battery
+
+
C1
1µF
V_IN
V_{OUT +}
TC1262
C2
1µF
V_OUT
–
GND
TC1262
Description
3.1 Output Capacitor
A 1µF (min) capacitor from V_OUT 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 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.
© 2002 Microchip Technology Inc.
DS21373B-page 3