LXXLD37

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

3 of 7

www.unisonic.com.tw

QW-R102-091.b



PIN DESCRIPTION

PIN NO.

HSOP-8

DFN3030-10

PIN NAME

DESCRIPTION

1

-

GND

Ground pin.

2

2

FB

There’s an external resistor divider connected to this pin which is

necessary to give the feedback voltage to the regulator. The

is R1(connected with a bypass capacitor which can improve the

load transient response),and between FB and ground is R2.The

value of R2 and R1 are recommended between 100Ω~10kΩ.So

the output voltage is equals:

R2

R1

)(V)

3, 4

3, 4, 5

The output voltage pin of the regulator. There should be set an

output capacitor to compensate for closed-loop and also to

improve transient responses. It’s necessary to connect Pin 3 and

Pin 4 together by wide tracks.

5

6, 7, 8

This pin is the main supply input.

lower dropout voltage. Monitoring this pin’s voltage can reset

Power-On.

6

10

Power input pin of the control circuitry. Connecting this pin to a

+5V (recommended) supply voltage provides the bias for the

control circuitry. The voltage at this pin is monitored for

Power-On Reset purpose.

7

1

POK

Output pin for Power-OK signal output.

Being an open drain output, through senescing FB voltage, this

pin can show the users the output voltage’s states. That’s this pin

will be low under any of these two situations: the rising FB

not ready for users.

8

9

EN

Input Enable control pin. The output voltage can be shut down

when this pin is below 0.5V. This pin’s voltage can be set higher

the regulator will begin working normally.