TC1071 datasheet(9/20 Pages) MICROCHIP

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DS21353D-page 9

TC1070/TC1071/TC1187

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Input Voltage Supply (VIN)

Connect 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

necessary for proper operation. A 1 µF capacitor

connected from VIN to ground is recommended for

most applications.

3.2

Ground (GND)

Connect the unregulated input supply ground return to

GND. Also connect the negative side of the 1 µF typical

input decoupling capacitor close to GND and the

negative side of the output capacitor C1 to GND.

3.3

Shutdown Control Input (SHDN)

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 and supply cur-

rent is reduced to 0.5

μA (maximum).

3.4

Output Voltage Adjust (ADJ)

Output voltage setting is programmed with a resistor

divider from VOUT to this input. A capacitor may also be

added to this input to reduce output noise (see

Section 4.2 “Output Capacitor”).

3.5

Regulated Voltage Output (Vout)

Connect the output load to VOUT of the LDO. Also

connect the positive side of the LDO output capacitor

as close as possible to the VOUT pin.

Pin No.

(5-Pin SOT-23)

Symbol

Description

1VIN

Unregulated supply input.

GND

Ground terminal.

3SHDN

Shutdown control input.

ADJ

Output voltage adjust terminal.

5VOUT

Regulated voltage output.

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