ELM901FxA 1A 2x Charge Pump LED Driver
■Typical characteristics
Dropout Voltage-Iled
EFFICIENCY-Vin
LED = LUMILEDS LXHL-LW3C
0.5
0.4
0.3
0.2
0.1
100
90
80
70
60
50
40
30
20
10
400mA
600mA
ILED=
200mA
800mA
0
200
400
Iled (mA)
600
800
1000
2.6 2.8
3
3.2 3.4 3.6 3.8
Vin (V)
4 4.2 4.4
Iled-Rset
Iled-Vled
1000
900
800
700
600
500
400
300
200
100
0
1000
900
800
700
600
500
400
300
200
100
0
Iled=800mA
600mA
400mA
200mA
100mA
0
20 40 60 80 100 120 140 160 180 200
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Vled (V)
1
Rset (k�)
1x Mode Output Resistance - Top
Vin=3.3V
2x Mode Output Resistance - Top
Vin=3.2V, Vo=4.8V
0.25
0.2
2.5
2
0.15
0.1
0.05
0
Vin=3.6V
Vin=3.9V
1.5
1
0.5
0
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
Top (�)
Top (�)
11 - 9
ELM [ ELM ELECTRONICS ]
