RT9271 datasheet(6/15 Pages) RICHTEK

Part #	RT9271

Description	White LED Step-Up Converter in Tiny Package

Download	15 Pages

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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RT9271

6

DS9271-13 March 2007

www.richtek.com

Typical Operating Characteristics

Frequency vs. VIN

0.7

0.8

0.9

1

1.1

1.2

1.3

23456

VIN (V)

Driving 3 WLEDs

TA = 25

°C

VIN vs. Temperature

2

2.2

2.4

2.6

2.8

3

20

30

40

50

60

70

Temperature (°C)

Minimum Input Voltage vs. Temperature

for Delivering Full Brightness

3 WLEDs

VFB vs. Temperature

230

235

240

245

250

255

260

0

10

2030

4050

6070

Temperature

Driving 3 WLEDs

VIN = 3.6V

(

°C)

Efficiency vs. VIN (Driving 2 WLEDs)

80

81

82

83

84

85

86

87

88

89

90

23456

VIN (V)

TA = 25

°C

IO = 20mA

IO = 15mA

Efficiency vs. VIN (Driving 1 WLED)

82

83

84

85

86

87

88

89

90

91

92

22.5

33.5

4

VIN (V)

TA = 25

°C

IO = 20mA

IO = 15mA

Efficiency vs. VIN (Driving 3 WLEDs)

80

81

82

83

84

85

86

87

88

89

90

23456

VIN (V)

IO = 20mA

IO = 15mA

TA = 25

°C

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RT9271 Datasheet(PDF) 6 Page - Richtek Technology Corporation

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