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TC1054-4.0VCT Datasheet(PDF) 6 Page - Microchip Technology

No. de pieza TC1054-4.0VCT
Descripción Electrónicos  50mA, 100mA and 150mA CMOS LDOs with Shutdown and ERROR Output
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1054-4.0VCT Datasheet(HTML) 6 Page - Microchip Technology

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TC1054/TC1055/TC1186
DS21350B-page 6
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1054, TC1055 and TC1186 are precision fixed
output voltage regulators. (If an adjustable version is
desired, please see the TC1070/TC1071/TC1187 data
sheet.) Unlike bipolar regulators, the TC1054, TC1055
and TC1186 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 volts, and ERROR is open-
circuited.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
ERROR Open Drain 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 falls to VTH, and
inactive when VOUT rises above VTH by VHYS.
As shown in Figure 3-1, ERROR canbeusedas a
battery low flag, or as a processor RESET signal (with
the addition of timing capacitor C2). R1 x C2 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, 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.
TC1054
TC1055
TC1186
VOUT
SHDN
GND
ERROR
1
µF
C1
+
VIN
VOUT
Shutdown Control
(to CMOS Logic or Tie
to VIN if unused)
1
µF
+
Battery
+
0.2
µF
C2
C2 Required Only
if ERROR is used as a
Processor RESET Signal
(See Text)
R1
1M
V+
BATTLOW
or RESET
VTH
VOUT
ERROR
VIH
VOL
HYSTERESIS (VH)


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