TC2015 Microchip Technology, TC2015 Datasheet - Page 10

• Manufacturer Part Number: TC2015
• Description: (TC2xxx) 50 mA / 100 mA / 150 mA CMOS LDOs with Shutdown and Reference Bypass
• Manufacturer: Microchip Technology

TC2014/2015/2185
4.0
The TC2014, TC2015 and TC2185 are precision fixed
output voltage regulators (If an adjustable version is
needed, see the TC1070, TC1071 or TC1187
(DS21353) datasheet.) Unlike bipolar regulators, the
TC2014, TC2015 and TC2185 supply current does not
increase with load current. In addition, the LDO output
voltage is stable using 1 µF of ceramic or tantalum
capacitance over the entire specified input voltage
range and output current range.
Figure 4-1 shows a typical application circuit. The reg-
ulator is enabled any time the shutdown input (SHDN)
is at or above V
SHDN is at or below V
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) and V
zero volts.
FIGURE 4-1:
DS21662C-page 10
Battery
+
DETAILED DESCRIPTION
(from Power Control Logic)
+
1 µF
2
Shutdown Control
1
3
V
GND
SHDN
IN
IH
, and disabled (shutdown) when
IL
TC2014
TC2015
TC2185
Typical Application Circuit.
. SHDN may be controlled by a
Bypass
V
OUT
5
4
+
1 µF
0.01 µF
Reference
Bypass Cap
(Optional)
OUT
V
falls to
OUT
4.1
A 0.01 µF ceramic 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 the result is a longer time period to rated
output voltage when power is initially applied.
4.2
A 1 µF (min) capacitor from V
The output capacitor should have an esr (effective
series resistance) of 0.01
0.05 . to 5 for V
minum electrolytic capacitors can be used. When using
ceramic capacitors, X5R and X7R dielectric material
are recommended due to their stable tolerance over
temperature. However, other dielectrics can be used as
long as the minimum output capacitance is maintained.
4.3
A 1 µF capacitor should be connected from V
if there is more than 10 inches of wire between the reg-
ulator and this AC filter capacitor, or if a battery is used
as the power source. Aluminum, electrolytic or tanta-
lum capacitors can be used (Since many aluminum
electrolytic capacitors freeze at approximately -30°C,
solid tantalum are recommended for applications oper-
ating 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.
Bypass Input
Output Capacitor
Input Capacitor
OUT
< 2.5V. Ceramic, tantalum or alu-
2003 Microchip Technology Inc.
to 5
OUT
to ground is required.
for V
OUT
IN
2.5V, and
to GND