LXXLD70

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 8

www.unisonic.com.tw

QW-R502-674.e



MARKING INFORMATION

PACKAGE

VOLTAGE CODE

MARKING

HSOP-8

AD : ADJ



PIN CONFIGURATION

VIN

GND

FB

VOUT

VOUT

VIN

VCNTL

POK

EN

1

2

3

4

5

6

7

8



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

GND

Ground pin.

2

FB

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

give the feedback voltage to the regulator. The external circuit is combined as

the follow: between VOUT and FB 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:

VOUT=0.8·(1+

R2

R1

)(V)

3, 4

VOUT

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

VIN

This pin is the main supply input.

It’s necessary to connect the Exposed Pad and VIN together for lower dropout

voltage. Monitoring this pin’s voltage can reset Power-On.

6

VCNTL

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

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 voltage is not above the VPOK threshold; the falling

FB voltage is below the VPNOK threshold. That indicates the output voltage is not

ready for users.

8

EN

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

below 0.3V. This pin’s voltage can be set higher than VCNTL voltage by an

internal 10μA current source, and then the regulator will begin working normally.

Exposed Pad

VIN

Input Voltage.