TC2014_13 datasheet(9/20 Pages) MICROCHIP

9 / 20 page

 2001-2012 Microchip Technology Inc.

DS21662F-page 9

TC2014/2015/2185

3.0

PIN DESCRIPTIONS

The descriptions of the pins are described in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Unregulated Supply Input (VIN)

Connect the unregulated input supply to the VIN 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 VIN 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 COUT 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

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 (VOUT)

Connect the output load to VOUT of the LDO. Also con-

nect one side of the LDO output de-coupling capacitor

as close as possible to the VOUT pin.

Pin No.

Symbol

Description

1VIN

Unregulated supply input

GND

Ground terminal

SHDN

Shutdown control input

Bypass

Reference bypass input

5VOUT

Regulated voltage output

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