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FAN4855 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. FAN4855
Description  500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN4855 Datasheet(HTML) 3 Page - Fairchild Semiconductor

 
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FAN4855 Rev. 1.0.1
Recommended Operating Conditions
Electrical Characteristics
Unless otherwise specified, VIN = 1.6V to 3V, ILOAD = 1mA, TA = -40°C to +85°C. Test Circuit Fig.1. Typical values are at
TA = +25°C
Notes:
1. R4, R5, R6 tolerance
≤ 0.1%.
2. Current through R1, R2 is not taken into account.
Parameter
Min.
Max.
Units
Ambient Temperature Range
-40
+85
°C
VIN Operating Range
1.6
0.9 VOUT
V
VOUT Operating Range
3.0
5.0
V
Parameter
Conditions
Min.
Typ.
Max.
Units
Start Up Voltage
ILOAD < 1mA
1.35
1.6
V
Operating Voltage
After start ILOAD =10mA, VOUT = 3.3V or 5V
1.0
V
Output Voltage
VOUT(nom.) = 3.3V (Note 1)
VOUT(nom.) = 5V
3.15
4.775
3.3
5
3.45
5.225
V
V
Output Voltage Adjust Range
3
5
V
Steady State Output Current
VOUT = 3.3V, VIN = 2.5V
300
500
mA
VOUT = 5V, VIN = 2.5V
200
330
mA
Pulse Width
VIN = 3V
0.8
1.4
2
µs
VIN = 2.4V
1.2
1.7
2.5
µs
VIN = 1.8V
1.6
2.2
3.3
µs
VIN = 1.6V
1.7
2.5
4.0
µs
Minimum Off-Time
1
µs
Line Regulation
IOUT = 2mA, VOUT = 3.3V
0.5
2
%
VOUT = 5V
0.5
2
%
Load Regulation
0 to 250mA, VIN = 2.4V, VOUT = 3.3V
0.5
%
0 to 150mA, VIN = 2.4V, VOUT = 5V
1
%
Feedback Voltage (VFB)
1.243
V
LBI Threshold Voltage
0.390
V
LBI Hysteresys
25
mV
Internal NFET, PFET ON Resist.
ILOAD = 100mA
0.35
Power Efficiency
ILOAD = 200mA, VIN = 3V, VOUT = 3.3V
95
%
Input Current in Shut Down Mode
SHDN = 0V, VIN = 3V (Note 2)
8
50
µA
Quiescent Current
SHDN = 3V, VIN = 3V, VOUT = 3.3V
(Note 2)
80
160
µA
LBO Output Voltage Low
VLBI = 0, ISINK = 1mA
0.2
V
SHDN Input Threshold Voltage
VIN = 3V, VOUT = 3.3V/5V
1.5
V
SHDN Input Threshold Voltage
VIN = 1.6V, VOUT = 3.3V/5V
0.8
V


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