TC2014_13 Datasheet, PDF (9/20 Pages) Microchip Technology – 50 mA, 100 mA, 150 mA CMOS LDOs with Shutdown and Reference Bypass

3.0 PIN DESCRIPTIONS
The descriptions of the pins are described in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin No. Symbol
Description
1
V_IN
Unregulated supply input
2
GND Ground terminal
3
SHDN Shutdown control input
4
Bypass Reference bypass input
5
V_OUT Regulated voltage output
3.1 Unregulated Supply Input (V_IN)
Connect the unregulated input supply to the V_IN pin. If
there is a large distance between the input supply and
the LDO regulator, some input capacitance is neces-
sary for proper operation. A 1 µF capacitor, connected
from V_IN to ground, is recommended for most
applications.
3.2 Ground Terminal (GND)
Connect the unregulated input supply ground return to
GND. Also connect one side of the 1 µF typical input
decoupling capacitor close to this pin and one side of
the output capacitor C_OUT to this pin.
TC2014/2015/2185
3.3 Shutdown Control Input (SHDN)
The regulator is fully enabled when a logic-high is
applied to SHDN. The regulator enters shutdown when
a logic-low is applied to this input. During shutdown, the
output voltage falls to zero and the supply current is
reduced to 0.5 µA (max).
3.4 Reference Bypass Input (Bypass)
Connecting a low-value ceramic capacitor to Bypass
will further reduce output voltage noise and improve the
Power Supply Ripple Rejection (PSRR) performance
of the LDO. Typical values from 470 pF to 0.01 µF are
suggested. While smaller and larger values can be
used, these affect the speed at which the LDO output
voltage rises when input power is applied. The larger
the bypass capacitor, the slower the output voltage will
rise.
3.5 Regulated Voltage Output (V_OUT)
Connect the output load to V_OUT of the LDO. Also con-
nect one side of the LDO output de-coupling capacitor
as close as possible to the V_OUT pin.
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DS21662F-page 9