TC1264_06 Datasheet, PDF (6/18 Pages) Microchip Technology – 800 mA Fixed-Output CMOS LDO with Shutdown

TC1264
4.0 DETAILED DESCRIPTION
The TC1264 is a precision, fixed output LDO. Unlike
bipolar regulators, the TC1264’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 4-1 shows a typical application circuit.
FIGURE 4-1:
TYPICAL APPLICATION
CIRCUIT
V_IN
V_IN
V_OUT
+ _C1
V_OUT
TC1264
1 µF
GND
SHDN
4.1 Output Capacitor
A 1 µF (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. A 1 µF
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.
DS21375C-page 6
© 2006 Microchip Technology Inc.