TC2054_06 Datasheet, PDF (8/18 Pages) Microchip Technology – 50 mA, 100 mA, and 150 mA CMOS LDOs with Shutdown and Error Output

TC2054/2055/2186
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin Number
1
2
3
4
5
Symbol
V_IN
GND
SHDN
ERROR
V_OUT
Description
Unregulated supply input.
Ground terminal.
Shutdown control input. The regulator is fully enabled when a logic high is applied
to this input. The regulator enters shutdown when a logic low is applied to this
input. During shutdown, output voltage falls to zero, ERROR is open circuited
and supply current is reduced to 0.5µA (max).
Out-of-Regulation Flag. (Open-drain output). This output goes low when V_OUT is
out-of-tolerance by approximately -5%.
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
necessary 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.
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 Out-of-Regulation Flag (ERROR)
The open-drain ERROR flag provides indication that
the regulator output voltage is not in regulation. The
ERROR pin will be low when the output is typically
below 5% of its specified value.
3.5 Regulated Voltage Output (V_OUT)
Connect the output load to V_OUT of the LDO. Also
connect one side of the LDO output decoupling
capacitor as close as possible to the V_OUT pin.
DS21663C-page 8
© 2006 Microchip Technology Inc.