AAT3221IGV-1.7-T1

更新时间： 2024-02-14 03:56:44

品牌	Logo	应用领域
ANALOGICTECH		稳压器
页数	文件大小	规格书
16页	222K
描述
150mA NanoPower™ LDO Linear Regulator

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AAT3221IGV-1.7-T1 数据手册

PRODUCT DATASHEET

AAT3221/2

PowerLinear^TM

150mA NanoPower™ LDO Linear Regulator

The power dissipation for a 150mA load occurring for

8.2% of the duty cycle will be 20.9mW. Finally, the two

power dissipation levels can summed to determine the

total true power dissipation under the varied load:

Printed Circuit Board Layout

Recommendations

In order to obtain the maximum performance from the

AAT3221/2 LDO regulator, very careful attention must

be considered in regard to the printed circuit board lay-

out. If grounding connections are not properly made,

power supply ripple rejection and LDO regulator tran-

sient response can be compromised.

P_D(total)= P_D(100mA)+ P_D(150mA)

P_D(total)= 229.5mW + 30.75mW

P_D(total)= 260.25mW

The LDO regulator external capacitors C_INand C_OUT

should be connected as directly as possible to the ground

pin of the LDO regulator. For maximum performance

with the AAT3221/2, the ground pin connection should

then be made directly back to the ground or common of

the source power supply. If a direct ground return path

is not possible due to printed circuit board layout limita-

tions, the LDO ground pin should then be connected to

the common ground plane in the application layout.

The maximum power dissipation for the AAT3221/2

operating at an ambient temperature of 85°C is 267mW.

The device in this example will have a total power dis-

sipation of 260.25mW. This is within the thermal limits

for safe operation of the device.

w w w . a n a l o g i c t e c h . c o m

3221.2007.11.1.12

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