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RT9271 Datasheet(PDF) 6 Page - Richtek Technology Corporation

Part # RT9271
Description  White LED Step-Up Converter in Tiny Package
PDF  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9271 Datasheet(HTML) 6 Page - Richtek Technology Corporation

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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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