S-1122 datasheet(21/29 Pages) SII

21 / 29 page

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.5.0_00

S-1112/1122 Series

Seiko Instruments Inc.

Reference Data

(1) Input transient response characteristics

S-1112B15 (Ta

= 25°C)

S-1112B30 (Ta

= 25°C)

IOUT

= 30 mA, tr = tf = 5.0 µs, COUT = 0.47 µF, CIN = 0 µF

IOUT

= 30 mA, tr = tf = 5.0 µs, COUT = 0.47 µF, CIN = 0 µF

1.62

1.60

1.58

1.56

1.54

1.52

1.50

1.48

1.46

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

VIN

VOUT

-40 -20

80 100 120 140 160

-40 -20

80 100 120 140 160

VIN

VOUT

3.08

3.06

3.04

3.02

3.00

2.98

2.96

t [

µs]

t [

µs]

S-1112B50 (Ta

= 25°C)

IOUT

= 30 mA, tr = tf = 5.0 µs, COUT = 0.47 µF, CIN = 0 µF

5.12

5.10

5.08

5.06

5.04

5.02

5.00

4.98

4.96

VIN

VOUT

-40 -20

80 100 120 140 160

t [

µs]

(2) Load transient response characteristics

S-1112B15 (Ta

= 25°C)

S-1112B30 (Ta

= 25°C)

VIN

= 2.5 V, COUT = 0.47 µF, CIN = 1.0 µF, IOUT = 50↔100 mA

VIN

= 4.0 V, COUT = 0.47 µF, CIN = 1.0 µF, IOUT = 50↔100 mA

80 100 120 140

-40 -20

160

IOUT

VOUT

1.70

1.65

1.60

1.55

1.50

1.45

1.40

150

100

–50

–100

–150

80 100 120 140

-40 -20

160

IOUT

VOUT

150

100

–50

–100

–150

3.20

3.15

3.10

3.05

3.00

2.95

2.90

t [

µs]

t [

µs]

S-1112B50 (Ta

= 25°C)

VIN

= 6.0 V, COUT = 0.47 µF, CIN = 1.0 µF, IOUT = 50↔100 mA

80 100 120 140

-40 -20

160

VOUT

IOUT

5.20

5.15

5.10

5.05

5.00

4.95

4.90

150

100

–50

–100

–150

t [

µs]

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