S-8337ACDB-P8T1G datasheet(27/51 Pages) SII

Part #	S-8337ACDB-P8T1G

Description	SWITCHING REGULATOR CONTROLLER

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Manufacturer	SII [Seiko Instruments Inc]

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STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER

Rev.4.0_01

S-8337/8338 Series

27

2. Example of Major Power Supply Dependence Characteristics (Ta

= 25°C)

ISS1 vs. VIN

1200

1000

800

600

400

200

0

1

2

3

4

5

6

7

VIN [V]

ISS1

[

μA]

fOSC

= 1133 kHz

(ROSC

= 120 kΩ)

fOSC

= 700 kHz

(ROSC

= 200 kΩ)

fOSC

= 286 kHz

(ROSC

= 510 kΩ)

ISSS vs. VIN

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

ISSS

[

μA]

fOSC

= 700 kHz (ROSC = 200 kΩ)

01

2

3

4

5

6

7

VIN [V]

–200

–180

–160

–140

–120

–100

–80

–60

–40

–20

0

IEXTH

[mA]

IEXTH vs. VIN

0

1

2

3

4

5

6

7

VIN [V]

fOSC

= 700 kHz, MaxDuty = 77% (ROSC= 200 kΩ, RDuty= 300 kΩ)

200

180

160

140

120

100

80

60

40

20

0

IEXTL

[mA]

IEXTL vs. VIN

fOSC

= 700 kHz, MaxDuty = 77% (ROSC= 200 kΩ, RDuty= 300 kΩ)

01

2

3

4

5

6

7

VIN [V]

0.10

0.08

0.06

0.04

0.02

0

–0.02

–0.04

–0.06

–0.08

–0.10

IFB

[

μA]

IFB vs. VIN

0

1

2

3

4

5

6

7

VIN [V]

fOSC vs. VIN

1400

1200

1000

800

600

400

200

0

fOSC

[kHz]

01

2

3

4

5

6

7

VIN [V]

fOSC

= 1133 kHz (ROSC = 120 kΩ)

fOSC

= 700 kHz (ROSC = 200 kΩ)

fOSC

= 286 kHz (ROSC = 510 kΩ)

100

90

80

70

60

50

40

30

20

10

0

MaxDuty

[%]

MaxDuty vs. VIN

0

1

2

3

4

5

6

7

VIN [V]

MaxDuty

= 88.5%

MaxDuty

= 47%

MaxDuty

= 77%

(ROSC

= 200 kΩ, RDuty= 100 kΩ) (ROSC= 200 kΩ, RDuty= 300 kΩ)

(ROSC

= 200 kΩ, RDuty= 820 kΩ)

tSS vs. VIN

25.0

20.0

15.0

10.0

5.0

0

tSS

[ms]

01

2

3

4

5

6

7

VIN [V]

tSS

= 10 ms

tSS

= 20 ms

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S-8337ACDB-P8T1G Datasheet(PDF) 27 Page - Seiko Instruments Inc

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