FAN4855 Fairchild Semiconductor, FAN4855 Datasheet - Page 5
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FAN4855
Manufacturer Part Number
FAN4855
Description
The FAN4855 is a low power boost regulator designed for low voltage DC to DC conversion in 2-cell battery powered systems such as digital cameras, cell phones and PDAs
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN4855.pdf
(12 pages)
Available stocks
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Part Number
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FAN4855 Rev. 1.0.1
Typical Operating Characteristics
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
600
500
400
300
200
100
3.5
2.5
1.5
0.5
0.0
4
3
2
1
0
0
1.5
0.6
0.1
V
OUT
V
Vin=3V
Load Current vs. Start-Up Voltage
0.8
OUT
= 3.3V
2
Starting Up and Turning Off
Efficiency vs. Load Current
TURN OFF:
Iload=50mA
Vin=2.0V
Iload=10mA
1
= 3.3V, Iloads = 10mA to 50mA
1.0
Output Current, mA
(Resistive Load)
Input Voltage, V
Input Voltage, V
2.5
Vout = 5V
1.2
10
Vin=1.5V
START UP
3
1.4
V
OUT
100
= 5V
3.5
1.6
(L = 10µH, C
1000
1.8
4
5
IN
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
= 47µF, C
0.0
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
5
4
3
2
1
0
0.1
1.5
0.6
Vin=3V
V
0.8
OUT
2
OUT
TURN OFF:
Efficiency vs. Load Current
Iload=10mA
Starting Up and Turning Off
SHDN Threshold Voltage
1
Vin=2.0V
= 47µF/1.0µF, T = 25°C)
= 5V, Iloads = 10mA to 50mA
Iload=50mA
2.5
Output Current, mA
1.0
Input Voltage, V
Input Voltage, V
Vout = 3.3V
10
1.2
3
Vin=1.5V
START UP
3.5
Iload=10mA to 50mA
1.4
100
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1.6
4
1000
4.5
1.8