MCP1701 datasheet(9/20 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

DS21874A-page 9

MCP1701

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Ground Terminal (GND)

Regulator ground. Tie GND to the negative side of both

the output and the input capacitor. Only the LDO bias

current (2 µA, typical) flows out of this pin, as there is

no high current. The LDO output regulation is refer-

enced to this pin. Minimize voltage drops between this

pin and the negative side of the load.

3.2

Regulated Voltage Output (VOUT)

Connect VOUT to the positive side of the load and the

positive terminal of the output capacitor. The positive

side of the output capacitor should be located as close

as possible to the LDO VOUT pin. The current flowing

out of this pin is equal to the DC load current.

3.3

Unregulated Supply Input (VIN)

Connect the input supply voltage and the positive side

of the input capacitor to VIN. Like all low dropout linear

regulators, low source impedance is necessary for the

stable operation of the LDO. The amount of capacitance

required to ensure low source impedance will depend

on the proximity of the input source capacitors or battery

type. The input capacitor should be located as close as

possible to the VIN pin. For most applications, 1 µF of

capacitance will ensure stable operation of the LDO

circuit. For applications that have load currents below

100 mA, the input capacitance requirement can be

lowered. The type of capacitor used can be ceramic,

tantalum or aluminum-electrolytic. The low ESR charac-

teristics of the ceramic will yield better noise and PSRR

performance at high frequencies. The current flow into

this pin is equal to the DC load current, plus the LDO

bias current (2 µA, typical).

Pin No.

SOT-23A

Pin No.

SOT-89

Pin No.

TO-92

Name

Function

GND

Ground terminal

233

VOUT

Regulated voltage output

322

VIN

Unregulated supply input

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