S1313 datasheet(19/56 Pages) SII

Part #	S1313

Description	SUPER LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR

PDF	56 Pages

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Manufacturer	SII [Seiko Instruments Inc]

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

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SUPER LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.2.1_00

S-1313 Series



Operation

1. Basic operation

Figure 17 shows the block diagram of the S-1313 Series.

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

resistance-divided by feedback resistors (Rs and Rf). It supplies the gate voltage necessary to maintain the constant

output voltage which is not influenced by the input voltage and temperature change, to the output transistor.

*1. Parasitic diode

VSS

Current

supply

−

Vfb

Vref

VIN

VOUT

Error

amplifier

Reference voltage

circuit

Figure 17

2. Output transistor

In the S-1313 Series, a low on-resistance P-channel MOS FET is used 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 reverse

current flowing from the VOUT pin through a parasitic diode to the VIN pin, when the potential of VOUT became higher

than VIN.

S1313 Datasheet(PDF) 19 Page - Seiko Instruments Inc