S-L2980A56MC-TF-G datasheet(11/23 Pages) SII

Part #	S-L2980A56MC-TF-G

Description	HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

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Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.4.1_00

S-L2980 Series

Seiko Instruments Inc.

11

Operation

1. Basic Operation

Figure 11 shows the block diagram of the S-L2980 Series.

The error amplifier compares the reference voltage (Vref) with the Vfb, which is the output voltage

resistance-divided by the feedback resistors Rs and Rf. It supplies the output transistor with the gate

voltage necessary to ensure certain output voltage free of any fluctuations of input voltage and

temperature.

Reference voltage circuit

VOUT

*1

VSS

VIN

Rs

Rf

Error

amplifier

Current source

Vref

–

+

Vfb

*1.

Parasitic diode

Figure 11

2. Output Transistor

The S-L2980 Series uses a low on-resistance P-channel MOS FET as the output transistor.

Be sure that VOUT does not exceed VIN+0.3 V to prevent the voltage regulator from being broken due to

inverse current flowing from VOUT pin through a parasitic diode to VIN pin.

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S-L2980A56MC-TF-G Datasheet(PDF) 11 Page - Seiko Instruments Inc

S-L2980A56MC-TF-G Datasheet(HTML) 11 Page - Seiko Instruments Inc

Similar Part No. - S-L2980A56MC-TF-G

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