MCP1701 datasheet(10/20 Pages) MICROCHIP

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MCP1701

DS21874A-page 10

 2004 Microchip Technology Inc.

4.0

DETAILED DESCRIPTION

The MCP1701 is a low quiescent current, precision,

fixed-output voltage LDO. Unlike bipolar regulators,

the MCP1701 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 effective series

resistance (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:

MCP1701 Block Diagram.

VIN

VOUT

GND

Short-Circuit

Protection

Voltage

Reference

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