NJM2857DL3 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJM2857DL3

LOW DROPOUT VOLTAGE REGULATOR

Japan Radio Corporation  

NJM2857

www.DataSheet4U.com

*Input Capacitance CIN

Input Capacitance CIN is required to prevent oscillation and reduce power supply ripple for applications with high

power supply impedance or a long power supply line.

You should use the CIN value of 0.1µF larger to avoid the problem.

CIN should connect between GND and VIN as shortest path as possible.

*Output Capacitance Co

Output capacitor (Co) will be required for a phase compensation of the internal error amplifier.

The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.

This product is designed to work with a low ESR capacitor (Co). However use of recommended

capacitance or larger value is effective for stable operation.

Use of a smaller Co may cause excess output noise or oscillation of the regulator due to lack of the

phase compensation.

Therefore use Co with the recommended capacitance or larger value and connect between Vo terminal and GND

terminal with shortest path. The recommended capacitance depends on the output voltage rank. Low voltage

regulator requires larger value Co. Thus, check the recommended capacitance for each output voltage rank.

Use of a larger Co reduces output noise and ripple output, and also improves output transient response

against rapid load change.

*Reverse Current Protection

A reverse current protection circuit is built-in to this product and prevents a current inflow from an Output terminal to

the Input terminal when the input terminal voltage became lower than the output terminal voltage.

When a regulator is controlled by off (VCONT<0.6V), the reverse current protection circuit functions.

-6-

Ver.2010-02-08

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