L1923

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R502-440.c

MARKING INFORMATION

PACKAGE

VOLTAGE CODE

MARKING

SOT-25

33:3.3V

35:3.5V

39:3.9V

4

5

3

2

1

BQ

G

Voltage Code

G: Halogen Free

L: Lead Free

PIN CONFIGURATION

1

SHDN

2

GND

3

IN

4

OUT

5

SET

PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

SHDN

Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA.

Connect to IN for normal operation.

2

GND

Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board

ground plane to maximize thermal dissipation.

3

IN

Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to

GND

4

OUT

Regulator Output. Fixed or adjustable from 1.25V to +5.5V. Sources up to 500mA.

Bypass with a 4.7µF, ＜0.2Ω typical ESR capacitor to GND.

5

SET

Feedback Input for Setting the Output Voltage. Connect to GND to set the output

voltage to the preset output voltage. Connect to an external resistor divider for

adjustable-output operation.