SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR

S-1721 Series

Seiko Instruments Inc.

2

Block Diagrams

1. S-1721 Series A type

Function

Status

ON/OFF logic

1ch Active “H”

2ch Active “H”

Pull-up resistor

1ch None

2ch None

Pull-down resistor

1ch Available

2ch Available

*1. Parasitic diode

ON/OFF1

Overcurrent

protector

ON/OFF

circuit

Reference

voltage circuit

+

−

+

−

VIN

ON/OFF2

VOUT1

VSS

VOUT2

Overcurrent

protector

ON/OFF

circuit

Reference

voltage circuit

*1

*1

Figure 1

2. S-1721 Series B type

Function

Status

ON/OFF logic

1ch Active “H”

2ch Active “L”

Pull-up resistor

1ch None

2ch Available

Pull-down resistor

1ch Available

2ch None

*1. Parasitic diode

ON/OFF1

Overcurrent

protector

ON/OFF

circuit

Reference

voltage circuit

+

−

+

−

VIN

ON/OFF2

VOUT1

VSS

VOUT2

Overcurrent

protector

ON/OFF

circuit

Reference

voltage circuit

*1

*1

Figure 2