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TC1107 Datasheet(PDF) 4 Page - Microchip Technology

No. de pieza TC1107
Descripción Electrónicos  300mA CMOS LDO with Shutdown and VREF Bypass
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1107 Datasheet(HTML) 4 Page - Microchip Technology

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TC1107
DS21356B-page 4
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1107 is a precision regulator available in fixed
voltages. Unlike bipolar regulators, the TC1107’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
microcontroller. 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), VOUT falls to zero.
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 5.0Ω.A 1µF
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 can be improved by increasing the
value of the input and output capacitors and employing
passive filtering techniques.
3.2
Bypass Input
A 470pF capacitor connected from the Bypass input to
ground
reduces
noise
present
on
the
internal
reference, which in turn significantly reduces output
noise. If output noise is not a concern, this input may be
left unconnected. Larger capacitor values may be
used, but results in a longer time period to rated output
voltage when power is initially applied.
TC1107
1
2
3
4
5
6
7
8
VOUT
VOUT
CBYPASS
Shutdown Control
(from Power Control Logic)
C2
1
µF
GND
NC
Bypass
VIN
NC
NC
SHDN
C1
1
µF
Battery
+
+
+
470pF
(Optional)


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