AAT1239-1_0810 Datasheet, PDF (5/23 Pages) Advanced Analogic Technologies – 40V Step-Up Converter for 4 to 10 White LEDs

SwitchReg^TM
Typical Characteristics
Efficiency vs. LED Current
(10 White LEDs; R_BALLAST = 30.1Ω)
80
78
76
V_IN = 5V
74
72
70
68
V_IN = 4.2V ^VIN ^{= 3.6V}
66
2
4
6
8
10 12 14 16 18 20
I_LED (mA)
PRODUCT DATASHEET
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
Efficiency vs. LED Current
(9 White LEDs; R_BALLAST = 30.1Ω)
78
V_IN = 5V
76
74
72
70
V_IN = 4.2V
V_IN = 3.6V
68
66
2
4
6
8
10 12 14 16 18 20
I_LED (mA)
Shutdown Current vs. Input Voltage
(EN = GND)
1.0
0.8
0.6
85°C
0.4
25°C
0.2
-40°C
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Line Transient
(10 White LEDs; R_BALLAST = 30.1Ω)
4.2V
3.6V
33.2
33
32.8
0.62
0.6
0.58
Time (50µs/div)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.7
Accuracy I_LED vs. Input Voltage
(V_FB = 0.6V; R_BALLAST = 30.1Ω)
-40°C
25°C 85°C
3.2
3.7
4.2
4.7
5.2
5.7
Input Voltage (V)
Accuracy I_LED vs. Temperature
(V_FB = 0.6V; R_BALLAST = 30.1Ω)
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-40
-15
10
35
60
85
Temperature (°C)
1239-1.2008.10.1.2
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