LR18943A

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 5

www.unisonic.com.tw

QW-R102-094.a



PIN CONFIGURATION

1

2

VPP

3

SET1

7 ADJ

6 SSC

5 EN

SET2 4

GND



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

Input voltage. Large bulk capacitance should be placed closely to this pin, A 10uF

ceramic capacitor is recommended at this pin

2

Input voltage for controlling circuit

3

SET1

Output voltage setting pin. Pull-high: 1, Pull-Low; 0

4

SET2

Output voltage setting pin. Pull-high: 1, Pull-Low; 0

5

EN

Enable input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent

current to a fraction of its operating value. The device will be disabled if this pin is left

open

6

SSC

Inrush current limit pin

7

ADJ

Resistor ratio of external feedback for output voltage by VO=0.8*(R1+R2)/R2 Volts

8

The power output of the device. A pull low resistance exists when device deactivated by

EN pin



BLOCK DIAGRAM

EN

GND

SSC

ADJ

SET1

SET2

Thermal

Shutdown

+

-

Current

Limit

Gate

Driver

0.8V