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