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TC1070 Datasheet(PDF) 5 Page - Microchip Technology

Part No. TC1070
Description  50mA, 100mA and 150mA Adjustable CMOS LDOs with Shutdown
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1070 Datasheet(HTML) 5 Page - Microchip Technology

 
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© 2002 Microchip Technology Inc.
DS21353B-page 5
TC1070/TC1071/TC1187
3.0
DETAILED DESCRIPTION
The TC1070, TC1071 and TC1187 are adjustable fixed
output voltage regulators. (If a fixed version is desired,
please see the TC1014/TC1015/TC1185 data sheet.)
Unlike bipolar regulators, the TC1070, TC1071 and
TC1187 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 volts.
FIGURE 3-1:
BATTERY-OPERATED
SUPPLY
3.1
Adjust Input
The output voltage setting is determined by the values
of R1 and R2 (Figure 3-1). The ohmic values of these
resistors should be between 470K and 3M to minimize
bleeder current.
The output voltage setting is calculated using the
following equation.
EQUATION 3-1:
The voltage adjustment range of the TC1070, TC1071
and TC1187 is from VREF to (VIN – 0.05V). If so desired,
a small capacitor (100pF to 0.01
µF) may be added to
the ADJ input to further reduce output noise.
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.
TC1070
TC1071
TC1187
VOUT
SHDN
GND
C2
1
µF
+
VIN
+2.45V
Shutdown Control
(from Power
Control Logic)
C1
1
µF
+
3.0V
Battery
+
C3
100pF
to 0.01
µF
(Optional)
R1
470K
1
5
2
4
3
ADJ
R2
470K
VOUT =VREF x [
+1
]
R1
R2


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