MIC2297 datasheet(5/12 Pages) MICREL

Part #	MIC2297

Description	40V PWM Boost Regulator White LED Driver

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel

MIC2297

May 2005

5

M9999-050305

(408) 955-1690

Typical Characteristics

3

3.5

4

4.5

5

5.5

6

23456789 10

INPUT VOLTAGE (V)

Supply Current

vs. Input Voltage

Not Switching

VFB = 1V

95

96

97

98

99

100

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INPUT VOLTAGE (V)

Max Duty Cycle

vs. Input Voltage

400

500

600

700

800

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INPUT VOLTAGE (V)

Frequency

vs. Input Voltage

0

200

400

600

800

1000

1200

0

500

1000

1500

SWITCH CURRENT (mA)

Switch Current

vs. Switch Voltage

VIN = 3.6V

190

195

200

205

210

215

220

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INPUT VOLTAGE (V)

Switch Voltage

vs. Input Voltage

IFSWITCH = 0.5A

10

12

14

16

18

20

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INPUT VOLTAGE (V)

LED Current

vs. Input Voltage

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

1.5

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INPUT VOLTAGE (V)

BRT Voltage

vs. Input Voltage

100

120

140

160

180

200

220

240

260

280

300

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INPUT VOLTAGE (V)

FB Voltage

vs. Input Voltage

0

5

10

15

20

25

30

10001200

BRT VOLTAGE (mV)

LED Current

vs. BRT Voltage

RSENSE

0

50

100

150

200

250

300

FB Voltage

vs. BRT Voltage

10001200

BRT VOLTAGE (mV)

70

72

74

76

78

80

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INPUT VOLTAGE (V)

Efficiency for 10 LEDs @ 20mA

vs. Input Voltage

L = 6.8µH

40

45

50

55

60

65

70

75

80

0

5

10 15 20 25 30 35

LED CURRENT (mA)

Efficiency for 10 LEDs

vs. LED Current

L = 6.8µH

VIN = 3.2V

VIN = 3.6V

VIN = 4.2V

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