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TC2055-2.6VCTTR Datasheet(PDF) 11 Page - Microchip Technology

Part # TC2055-2.6VCTTR
Description  50 mA, 100 mA, and 150 mA CMOS LDOs with Shutdown and Error Output
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC2055-2.6VCTTR Datasheet(HTML) 11 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS21663D-page 11
TC2054/2055/2186
4.0
DETAILED DESCRIPTION
The TC2054, TC2055 and TC2186 are precision fixed
output voltage regulators. (If an adjustable version is
desired, refer to the TC1070/TC1071/TC1187 data
sheet (DS21353). Unlike bipolar regulators, the
TC2054, TC2055 and TC2186 supply current does not
increase with load current. In addition, V
OUT remains
stable and within regulation over the entire 0 mA to
maximum output current operating load range.
Figure 4-1 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 volts, and ERROR is
open-circuited.
FIGURE 4-1:
Typical Application Circuit.
4.1
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
(typical) for a 5.0V regulator and 2.85V (typical) for a
3.0V regulator). ERROR output operation is shown in
Figure 4-2.
Note that ERROR is active when VOUT falls to VTH, and
inactive when VOUT rises above VTH by VHYS.
As shown in Figure 4-1, ERROR can be used as 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 ms 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).
The ERROR pin sink current is self-limiting to
approximately 18 mA.
FIGURE 4-2:
Error Output Operation.
4.2
Output Capacitor
A 1 µF (minimum) capacitor from VOUT to ground is
required. The output capacitor should have an effective
series resistance of 0.01
Ω. to 5Ω for V
OUT = 2.5V, and
0.05
Ω. to 5Ω for V
OUT < 2.5V. Ceramic, tantalum and
aluminum electrolytic capacitors 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.
4.3
Input Capacitor
A 1 µF capacitor should be connected from VIN to GND
if there is more than 10 inches of wire between the
regulator and this AC filter capacitor, or if a battery is
used as the power source. Aluminum electrolytic or
tantalum
capacitors
can
be
used
(since
many
aluminum
electrolytic
capacitors
freeze
at
approximately -30°C, solid tantalum 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.
0.2 µF
C2
R1
1M
Ω
V+
C2 Required Only
if ERROR is used as a
Processor RESET Signal
(See Text)
Shutdown Control
(to CMOS Logic or Tie
to VIN if unused)
BATTLOW
or RESET
TC2054
TC2055
TC2186
VIN
BATTERY
VOUT
GND
1µF
VOUT
1µF
C1
ERROR
SHDN
VIH
VOL
ERROR
VTH
VOUT
HYSTERESIS (VHYS)


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