S1721 datasheet(31/42 Pages) SII

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

Rev.2.0_00

S-1721 Series

Seiko Instruments Inc.

(4) Transient Response Characteristics of Load’s Mutual Interference (Ta = 25°C)

VOUT1 = VOUT2 = 1.2 V

VIN = 2.2 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,

IOUT1 = 10 ↔ 100 mA, IOUT2 = no load

VOUT1 = VOUT2 = 3.0 V

VIN = 4.0 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,

IOUT1 = 10 ↔ 100 mA, IOUT2 = no load

1.26

1.22

1.18

1.10

1.06

t [

μs]

−50

200

300

50 100 150

250

350

−100

1.14

VOUT1

1.30

1.26

1.22

1.18

1.14

VOUT2

150

−50

100

IOUT1

3.05

3.00

2.95

2.85

2.80

t [

μs]

−50

200

300

50 100 150

250

350

−100

2.90

3.10

3.05

3.00

2.95

2.90

VOUT2

150

−50

100

IOUT1

VOUT1

VOUT1 = VOUT2 = 5.0 V

VIN = 6.0 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,

IOUT1 = 10 ↔ 100 mA, IOUT2 = no load

5.10

5.00

4.90

4.70

4.60

t [

μs]

−50

200

300

50 100 150

250

350

−100

4.80

5.20

5.10

5.00

4.90

4.80

VOUT2

150

−50

100

IOUT1

VOUT1

(5) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25

°C)

100

150

IOUT [mA]

CIN = CLn = 1.0 μF

0.01

Stable

Remark

CLn: Capacitor set to VOUTn pin externally (n = 1, 2)

S1721 Datasheet(PDF) 31 Page - Seiko Instruments Inc

S1721 Datasheet(HTML) 31 Page - Seiko Instruments Inc

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