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MCP1701A

2 µA Low-Dropout Positive Voltage Regulator

Microchip Technology 

MCP1701A

3.0 PIN DESCRIPTIONS

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

TABLE 3-1:

Pin No.

SOT-23A

1

2

3

PIN FUNCTION TABLE

Pin No.

SOT-89

Pin No.

TO-92

Name

1

1

GND

3

3

VOUT

2

2

VIN

3.1 Ground Terminal (GND)

Regulator ground. Tie GND to the negative side of the

output and the negative side of the input capacitor.

Only the LDO bias current (2 µA, typ.) flows out of this

pin, there is no high current. The LDO output regulation

is referenced 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 physically

located as close as possible to the LDO VOUT pin. The

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

current.

Function

Ground Terminal

Regulated Voltage Output

Unregulated Supply Input

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 physically 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 equivalent series

resistance characteristics of the ceramic will yield

better noise and PSRR performance at high frequency.

The current flow into this pin is equal to the DC load

current, plus the LDO bias current (2 µA, typical).

© 2007 Microchip Technology Inc.

DS21991C-page 9

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