SA57254-33GW datasheet(4/18 Pages) PHILIPS

Part #	SA57254-33GW

Description	CMOS switching regulator (PWM controlled)

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product data

SA57254-XX

CMOS switching regulator (PWM controlled)

2003 Nov 11

4

ELECTRICAL CHARACTERISTICS

Tamb = 25 °C, unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

Part #

MIN.

TYP.

MAX.

UNIT

VIN

input voltage

–

9.0

V

VST1

operating start voltage

IOUT = 1.0 mA

–

0.9

V

VST2

oscillator start voltage

–

0.8

V

VHLD

operation hold voltage

IOUT = 1.0 mA

–

0.7

–

V

ISS1

consumption current 1

VOUT = output voltage × 0.95

-20

–

11.6

19.4

µA

-25

–

14.3

23.9

µA

-28

–

16.1

26.8

µA

-30

–

17.2

28.7

µA

-33

–

19.1

31.8

µA

-36

–

22.4

37.3

µA

-50

–

38.5

64.1

µA

ISS2

consumption current 2

VOUT = output voltage + 0.5 V

-20

–

3.1

6.2

µA

-25

–

3.2

6.3

µA

-28

–

3.2

6.4

µA

-30

–

3.2

6.4

µA

-33

–

3.3

6.5

µA

-36

–

3.3

6.5

µA

-50

–

3.5

6.9

µA

RDS(ON)

internal switch-on resistance

VSW = 0.4 V

-20

–

5.6

8.9

Ω

()

-25

–

4.1

6.5

Ω

-28

–

4.1

6.5

Ω

-30

–

3.2

5.1

Ω

-33

–

3.2

5.1

Ω

-36

–

3.2

5.1

Ω

-50

–

2.2

3.5

Ω

ISWO

switching transistor leak

current

VOUT = VSW = 9 V

–

1.0

µA

∆VOUT2

load ripple voltage

IOUT = 10 mA ≈ IOUT (following) × 1.25

–

30

60

mV

∆VOUT/∆Tamb output voltage temperature

coefficient

–40

°C ≤ Tamb ≤ +85 °C

–

±50

–

ppm/

°C

fOSC

oscillator frequency

VOUT = output voltage × 0.95

–

42.5

50

57.5

kHz

MaxDuty

maximum duty ratio

VOUT = output voltage × 0.95

–

75

83

90

%

tSS

soft start time

IOUT = 1.0 mA

–

3.0

6.0

12

ms

EFFI

efficiency

-20

–

75

–

%

-25

–

79

–

%

-28

–

79

–

%

-30

–

83

–

%

-33

–

83

–

%

-36

–

83

–

%

-50

–

87

–

%

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