ST1938

DC-DC Step-Up Converter for White LED Driver

STANSON TECHNOLOGY

120 Bentley Square, Mountain View, Ca 94040 USA

www.stansontech.com

ST1938 2008. V1

ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3.6V, unless otherwise specified.)

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

VIN

Operating Voltage

2.4

7

V

VFB

Feedback Voltage

ISW=100mA, Duty

Cycle = 66%

86

110

mV

IFB

FB Pin Bias Current

150

nA

VSHDN > 0V

2.8

3.5

mA

IS

Supply Current

VSHDN = 0V

0.05 1.0

μA

Fosc

Switching Frequency

0.68

0.8

1.0

MHz

D

Maximum Duty Cycle

85

%

Iout

Switch Current Limit

320

mA

ILEAKAGE Switch Leakage Current

VSW= 5V

0.01

5

μA

Vcesat

Switch Vcesat

ISW = 200mA

150

mV

ISHDN

SHDN Pin Current

90

uA

VSHDNH SHDN Voltage High

1.5

V

SHDNL

SHDN Voltage Low

0.4

V

VOVP

Over Voltage Preotection

Vout Rising

21

V