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TC1173VUA Datasheet(PDF) 4 Page - Microchip Technology

No. de pieza TC1173VUA
Descripción Electrónicos  300mA CMOS LDO with Shutdown ERROR output and Bypass
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1173VUA Datasheet(HTML) 4 Page - Microchip Technology

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TC1173
DS21362B-page 4
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1173 is a fixed output, low drop-out regulator.
Unlike bipolar regulators, the TC1173’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) is at or above 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 and ERROR is disabled.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
ERROR Output
ERROR is driven low whenever VOUT falls out of
regulation by more than – 5% (typical). This condition
may be caused by low input voltage, output current
limiting, or thermal limiting. The ERROR threshold is
5% below rated VOUT regardless of the programmed
output voltage value (e.g., ERROR =VOL at 4.75V
(typ.) for a 5.0V regulator and 2.85V (typ.) for a 3.0V
regulator). ERROR output operation is shown in
Figure 3-2.
Note that ERROR is active when VOUT is at or below
VTH, and inactive when VOUT is above VTH +VH.
As shown in Figure 3-1, ERROR canbe usedas a
battery low flag, or as a processor RESET signal (with
the addition of timing capacitor C3). R1 x C3 should be
chosen to maintain ERROR below VIH of the processor
RESET input for at least 200 msec to allow time for the
system to stabilize. Pull-up resistor R1 can be tied to
VOUT,VIN or any other voltage less than (VIN +0.3V).
FIGURE 3-2:
ERROR OUTPUT
OPERATION
3.2
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.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 recom-
mended 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.
3.3
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.
TC1173
1
2
3
4
VOUT
VOUT
CBYPASS
470pF
(Optional)
Shutdown Control
(from Power Control Logic)
C1
1
µF
GND
NC
Bypass
VIN
NC
SHDN
+
ERROR
5
6
7
8
C3 required only if ERROR
is used as a processor RESET signal.
(see text)
Battery
RESET or
Battery Low
R3
1M
C2
1
µF
C3
0.2
µF
+
+
VTH
VOUT
ERROR
VIH
VOL
HYSTERESIS (VH)


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