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MIC3291 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part # MIC3291
Description  1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control
PDF  17 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC3291 Datasheet(HTML) 5 Page - Micrel Semiconductor

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Micrel, Inc.
MIC3291
September 2010
5
M9999-092810
(408) 944-0800
Typical Characteristics
Feedback Voltage
vs. Brightness Level
0
25
50
75
100
125
150
175
200
225
250
275
0 1 2 3 4 5 6 7 8 9 10 1112 13 14 15
BRIGHTNESS LEVEL (0-15)
6 Series White LED
Efficiency
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
WHITE LED CURRENT (mA)
3 Series White LED
Efficiency
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
WHITE LED CURRENT (mA)
VIN = 2.8V
VIN = 2.8V
L = 10µH
COUT = 0.27µF
VIN = 3.6V
VIN = 4.2V
L = 10µH
COUT = 0.27µF
VIN = 3.6V
VIN = 4.2V
6 Series White LED
Efficiency
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
WHITE LED CURRENT (mA)
Feedback Voltage
vs. Input Voltage
240
242
244
246
248
250
252
254
256
258
260
2.533.5
44.555.56
INPUT VOLTAGE (V)
3 Series White LED
Efficiency
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
WHITE LED CURRENT (mA)
L = 22µH
COUT = 0.27µF
VIN = 2.8V
VIN = 4.2V
VIN = 3.6V
L = 22µH
COUT = 0.27µF
VIN = 2.8V
VIN = 3.6V
VIN = 4.2V
Peak Switch Current
vs. Input Voltage
200
300
400
500
600
700
800
900
1000
Current Limit
vs. Input Voltage
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
Input Current
vs. Input Voltage
0
50
100
150
200
250
300
350
2.5
3
3.5
4
4.5
5
5.5
6
INPUT VOLTAGE (V)
L=10µH
2.53
3.544.5
55.5
INPUT VOLTAGE (V)
6 LEDs
3 LEDs
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1 6.6
INPUT VOLTAGE (V)



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