AP7167

1.2A LOW DROPOUT REGULATOR WITH POK

AP7167

Document number: DS31252 Rev. 7 - 2

10 of 14

www.diodes.com

September 2010

© Diodes Incorporated

Low Quiescent Current

The AP7167, consuming only around 150µA for all input

range and output loading, provides great power saving in

portable and low power applications.

Wide Output Range

The AP7167, 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 +155°C, allowing the

device to cool down. When the junction temperature

reduces to approximately +130°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 AP7167 is available in the DFN3030-10 and SOP-8L-

EP packages, both 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

150

(

)

T

(max@

P

θ

−

°

+

=