FAN4855 Datasheet, PDF (3/12 Pages) Fairchild Semiconductor – 500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect

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