FAN4855 Datasheet, PDF (5/12 Pages) Fairchild Semiconductor – 500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect

Typical Operating Characteristics (L = 10µH, C_IN = 47µF, C_OUT = 47µF/1.0µF, T = 25°C)
Load Current vs. Start-Up Voltage
(Resistive Load)
600
500
VOUT = 3.3V
400
300
VOUT = 5V
200
100
0
1.5
2
2.5
3
3.5
4
Input Voltage, V
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.1
Efficiency vs. Load Current
Vout = 3.3V
Vin=3V
Vin=2.0V _Vin=1.5V
1
10
100
Output Current, mA
1000
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.1
Efficiency vs. Load Current
Vout = 5V
Vin=3V
Vin=2.0V Vin=1.5V
1
10
100
Output Current, mA
1000
SHDN Threshold Voltage
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
1.5
2
2.5
3
3.5
4
4.5
Input Voltage, V
Starting Up and Turning Off
VOUT = 3.3V, Iloads = 10mA to 50mA
4
3.5
3
TURN OFF:
Iload=50mA
START UP
2.5
Iload=10mA
2
1.5
1
0.5
0
0.6 0.8 1.0 1.2 1.4 1.6 1.8
Input Voltage, V
5
4
3
2
1
0
0.6
Starting Up and Turning Off
VOUT = 5V, Iloads = 10mA to 50mA
Iload=50mA
Iload=10mA
START UP
Iload=10mA to 50mA
TURN OFF:
0.8 1.0 1.2 1.4 1.6 1.8
Input Voltage, V
5
FAN4855 Rev. 1.0.1
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