RT9284A15GJ6 datasheet(6/14 Pages) RICHTEK

Part #	RT9284A15GJ6

Description	Tiny Package, High Performance, Constant Current Switching Regulator for White LED

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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6

RT9284A/B

www.richtek.com

DS9284A/B-05 August 2007

Typical Operating Characteristics

LED Current vs. Input Voltage

18

18.5

19

19.5

20

20.5

21

21.5

22

3

3.25 3.5 3.75

4

4.25 4.5 4.75

5

5.25 5.5

Input Voltage (V)

4WLEDs, L = 10

μH

Maximum Duty Cycle vs. VDD

85%

86%

87%

88%

89%

90%

91%

3

3.25 3.5 3.75

4

4.25 4.5 4.75

5

5.25 5.5

VDD (V)

91

90

89

88

87

86

85

POR (Rising/Falling) vs. Temperature

1.5

1.7

1.9

2.1

2.3

2.5

2.7

-40 -30 -20 -10

0

1020 304050 6070 8090

Temperature (

°C)

Rising

Falling

Shut Down Voltage vs. Input Voltage

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

3

3.25 3.5 3.75

4

4.25 4.5 4.75

5

5.25 5.5

Input Voltage (V)

-45

°C

25

°C

85

°C

Enable Voltage vs. Input Voltage

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

3

3.25 3.5 3.75

4

4.25 4.5 4.75

5

5.25 5.5

Input Voltage (V)

-45

°C

25

°C

85

°C

Efficiency vs. Input Voltage

80.5

81

81.5

82

82.5

83

83.5

84

3

3.2

3.4

3.6

3.8

4

4.2

4.4

Input Voltage (V)

3WLEDs

4WLEDs

ILED = 20mA, L = 4.7

μH, DCR = 0.15Ω

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