SP1938
DC-DC Step-Up Converter for White LED
ELECTRICAL CHARACTERISTICS
(T
A
=25
℃
, V
IN
=3V, V
SHDN
=3V, Unless otherwise specified)
Parameter
Operating Voltage
Feedback Voltage
FB Pin Bias Current
Supply Current
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch Leakage Current
Switch Saturation Voltage
SHDN Voltage High
SHDN Voltage Low
SHDN Pin Current
Over Voltage Protection
APPLICATION CIRCUIT
Conditions
I
SW
=100mA, Duty Cycle = 66%
V
SHDN
= 0V
0.8
Vsw= 5V
Isw = 200mA
1.5
0.4
V
OUT
rising
90
21
Min.
2.5
86
Typ.
Max.
18
110
150
3.5
1.0
1.6
5
Unit
V
%
nA
mA
μA
MHz
%
mA
μA
mV
V
V
uA
V
2.8
0.1
1.2
85
320
0.01
150
2009/03/30
Ver.1
Page 4