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TC1224-VCT Datasheet(PDF) 4 Page - Microchip Technology

No. de pieza TC1224-VCT
Descripción Electrónicos  50mA and 100mA CMOS LDOs with Shutdown
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1224-VCT Datasheet(HTML) 4 Page - Microchip Technology

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TC1223/TC1224
DS21368B-page 4
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1223 and TC1224 are precision fixed output
voltage regulators. Unlike bipolar regulators, the
TC1223 and TC1224’s supply current does not
increase with load current. In addition, VOUT remains
stable and within regulation over the entire 0mA to
IOUTMAX operating load current range, (an important
consideration in RTC and CMOS RAM battery back-up
applications).
Figure 3-1 shows a typical application circuit. The
regulator is enabled any time the shutdown input
(SHDN)isatorabove VIH, and shutdown (disabled)
when SHDN is at or below VIL. SHDN may be
controlled by a CMOS logic gate, or I/O port of a micro-
controller. If the SHDN input is not required, it should be
connected directly to the input supply. While in
shutdown, supply current decreases to 0.05
µA(typical)
and VOUT fallstozerovolts.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
Output Capacitor
A1
µF(min) capacitor from VOUT to ground is
recommended. The output capacitor should have an
effective series resistance greater than 0.1
Ω and less
than 5.0
Ω, 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 approxi-
mately -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.
TC1223
TC1224
VOUT
SHDN
GND
NC
1
µF
+
VIN
VOUT
Shutdown Control
(to CMOS Logic or Tie
to VIN if unused)
1
µF
+
Battery
+


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