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TC1014 Datasheet(PDF) 6 Page - Microchip Technology

Part No. TC1014
Description  50mA, 100mA and 150mA CMOS LDOs with Shutdown and Reference Bypass
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1014 Datasheet(HTML) 6 Page - Microchip Technology

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TC1014/TC1015/TC1185
DS21335B-page 6
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1014/TC1015/TC1185
are
precision fixed
output voltage regulators. (If an adjustable version is
desired, please see the TC1070/TC1071/TC1187 data
sheet.) Unlike bipolar regulators, the TC1014/TC1015/
TC1185 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 ranges (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 fallstozerovolts.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
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.
3.2
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 5Ω.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.
TC1014
TC1015
TC1185
VOUT
SHDN
GND
Bypass
470pF
Reference
Bypass Cap
(Optional)
1
µF
+
VIN
VOUT
Shutdown Control
(to CMOS Logic or Tie
to VIN if unused)
1
µF
+
Battery
+


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