AP7201 datasheet(11/13 Pages) DIODES

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AP7201

DUAL 150mA LOW DROPOUT LINEAR REGULATOR

AP7201 Rev. 3

11 of 13

MAY 2014

www.diodes.com

DISCONTINUED

Application Note (Continued)

Wide Fixed Output Range

The AP7201, with a wide fixed output range of 1V to

3.3V, provides a versatile solution for many portable and

low power applications.

Low Quiescent Current

The AP7201, consuming only around 25µA for all input

range, provides great power saving in portable and low

power applications.

Thermal Shutdown Protection

Thermal protection disables both outputs when the

junction temperature rises to approximately +145°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 ensure reliable

operation. Power dissipation of the device depends on

input voltage and load conditions and can be calculated

by:

OUT

)

(

−

The AP7201 is available in the DFN2818-6 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.

The maximum power dissipation, handled by the device,

depends on the maximum junction to ambient thermal

resistance,

maximum

ambient

temperature,

and

maximum device junction temperature, which can be

calculated by the equation in the following:

)

145

(

)

(max@

−

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