AP7165

600mA LOW DROPOUT REGULATOR WITH POK

AP7165 Rev. 1

10 of 11

OCTOBER 2007

www.diodes.com

Application Note

(Continued)

Low Quiescent Current

The AP7165, consuming only around 125µA for all input

range and output loading, provides great power saving

in portable and low power applications.

Wide Output Range

The AP7165, with a wide output range of 0.8V to 5.0V,

provides a versatile solution for many portable and low

power applications.

Thermal Shutdown Protection

Thermal protection disables the output when the

junction temperature rises to approximately +150°C,

allowing the device to cool down. When the junction

temperature reduces to approximately +125°C the

output circuitry is enabled again. Depending on power

dissipation,

thermal

resistance,

and

ambient

temperature, the thermal protection circuit may cycle on

and off. This cycling limits the heat dissipation of the

regulator, protecting it from damage due to overheating.

Power Dissipation

The device power dissipation and proper sizing of the

thermal plane that is connected to the thermal pad is

critical to avoid thermal shutdown and ensuring reliable

operation. Power dissipation of the device depends on

input voltage and load conditions and can be calculated

by:

OUT

OUT

IN

D

xI

)

V

V

(

P

−

=

The AP7165 is available in the DFN3030-10 package

with exposed pad, which is the primary conduction path

for heat to the printed circuit board (PCB). The pad can

be connected to ground or be left floating; however, to

ensure the device will not overheat, it should be

attached to an appropriate amount of copper PCB area.

However, the maximum power dissipation that can be

handled by the device depends on the maximum

junction to ambient thermal resistance, maximum

ambient temperature, and maximum device junction

temperature, which can be approximated by the

equation below:

JA

A

A

D

R

)

T

C

145

(

)

T

(max@

P

θ

−

°

+

=

Marking Information

(1) DFN3030-10

Y : Year 0~9

M : Month A~L

( Top View )

X : G : Green

Y M X

XX

XX : B2 : AP7165

Part Number

Package

Identification Code

AP7165

DFN3030-10

B2