MCP1701A datasheet(10/22 Pages) MICROCHIP

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MCP1701A

DS21991C-page 10

4.0

DETAILED DESCRIPTION

The MCP1701A is a low-quiescent current, precision,

fixed-output voltage LDO. Unlike bipolar regulators,

the MCP1701A supply current does not increase

proportionally with load current.

4.1

Output Capacitor

A minimum of 1 µF output capacitor is required. The

output capacitor should have an ESR greater than

0.1

Ω and less than 5Ω, plus a resonant frequency

above 1 MHz. Larger output capacitors can be used to

improve supply noise rejection and transient response.

Care should be taken when increasing COUT to ensure

that the input impedance is not high enough to cause

high input impedance oscillation.

4.2

Input Capacitor

A 1 µF input capacitor is recommended for most

applications when the input impedance is on the order

of 10

Ω. Larger input capacitance may be required for

stability when operating from a battery input, or if there

is a large distance from the input source to the LDO.

When large values of output capacitance are used, the

input capacitance should be increased to prevent high

source impedance oscillations.

4.3

Overcurrent

The MCP1701 internal circuitry monitors the amount of

current flowing through the P-channel pass transistor.

In the event of a short circuit or excessive output

current, the MCP1701 will act to limit the output current.

FIGURE 4-1:

MCP1701A Block Diagram.

VIN

VOUT

GND

Short Circuit

Protection

Voltage

Reference

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