ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
■Typical characteristics (ELM91xx1xA)
• ELM91181xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C)
Vout-Vin
Vout-Iout
2.5
2
2.5
2
Iout=1mA
1.5V
Vin=0.9V
1.5
1
1.5
1
1.1V
1.3V
Iout=40mA
Iout=10mA
0.5
0.5
0
0.5
1
1.5
2
0.1
1
10
100
1000
Vin (V)
Iout (mA)
EFFICIENCY-Iout
RIPPLE VOLTAGE-Iout
100
90
80
70
60
50
40
100
80
60
40
20
0
1.3V
1.5V
1.5V
Vin=0.9V
1.3V
1.1V
1.1V
Vin=0.9V
0.1
1
10
100
1000
0
20 40 60 80 100 120 140 160 180 200
Iout (mA)
Iout (mA)
22 - 7