S-T111B54MC-OHNTFG datasheet(11/23 Pages) SII

Part #	S-T111B54MC-OHNTFG

Description	HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR

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Manufacturer	SII [Seiko Instruments Inc]

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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.2.1_00

S-T111 Series

Seiko Instruments Inc.

11

Operation

1. Basic operation

Figure 11 shows the block diagram of the S-T111 Series.

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

divided by feedback resistors Rs and Rf. It supplies the output transistor with the gate voltage necessary

to ensure a certain output voltage free of any fluctuations of input voltage and temperature.

Reference voltage

circuit

VOUT

*1

*1.

Parasitic diode

VSS

VIN

Rs

Rf

Error

amplifier

Current

supply

Vref

−

+

Vfb

Figure 11

2. Output transistor

The S-T111 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 damaged due

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

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ABLIC Inc.	S-T111B54MC-OHNTFX	363Kb / 23P	HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_02

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Similar Description - S-T111B54MC-OHNTFG

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S-T111B54MC-OHNTFG Datasheet(PDF) 11 Page - Seiko Instruments Inc

S-T111B54MC-OHNTFG Datasheet(HTML) 11 Page - Seiko Instruments Inc

Similar Part No. - S-T111B54MC-OHNTFG

Similar Description - S-T111B54MC-OHNTFG

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