ST1938
DC-DC Step-Up Converter for White LED Driver
ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3.6V, unless otherwise specified.)
Symbol
VIN
Parameter
Operating Voltage
Feedback Voltage
Conditions
Min. Typ. Max. Unit
2.4
7
V
VFB
ISW=100mA, Duty
Cycle = 66%
mV
86
110
IFB
IS
FB Pin Bias Current
Supply Current
150
nA
VSHDN > 0V
VSHDN = 0V
2.8 3.5 mA
0.05 1.0 μA
0.68 0.8 1.0 MHz
Fosc
D
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
85
320
0.01
150
90
%
mA
μA
mV
uA
V
Iout
ILEAKAGE Switch Leakage Current
VSW= 5V
5
Vcesat
ISHDN
Switch Vcesat
ISW = 200mA
SHDN Pin Current
VSHDNH SHDN Voltage High
1.5
SHDNL
VOVP
SHDN Voltage Low
0.4
V
Over Voltage Preotection
Vout Rising
21
V
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com
ST1938 2008. V1
STANSON [ STANSON TECHNOLOGY ]
