Datasheet > AAT3242ITP-WN-T1

AAT3242ITP-WN-T1

更新时间： 2024-02-22 01:11:33

品牌	Logo	应用领域
AAT		稳压器
页数	文件大小	规格书
16页	261K
描述
300mA/150mA Dual CMOS LDO Linear Regulator

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技术参数
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AAT3242ITP-WN-T1 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.54	湿度敏感等级：	1
Base Number Matches：	1

AAT3242ITP-WN-T1 数据手册

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AAT3242

300mA/150mA Dual CMOS LDO Linear Regulator

Thermal Considerations and High

Output Current Applications

T_J(MAX)- T_A

θ_JA

P_D(MAX)

The AAT3242 is designed to deliver continuous

output load currents of 300mA and 150mA under

normal operations, and can supply up to 500mA

during circuit start-up conditions. This is desirable

for circuit applications where there might be a brief

high in-rush current during a power-on event.

Constants for the AAT3242 are T_J(MAX)(the maxi-

mum junction temperature for the device, which is

125°C) and θ_JA= 110°C/W (the package thermal

resistance). Typically, maximum conditions are cal-

culated at the maximum operating temperature of T_A

= 85°C and under normal ambient conditions where

T_A= 25°C. Given T_A= 85°C, the maximum package

power dissipation is 364mW. At T_A= 25°C, the max-

imum package power dissipation is 909mW.

The limiting characteristic for the maximum output

load current safe operating area is essentially

package power dissipation and the internal preset

thermal limit of the device. In order to obtain high

operating currents, careful device layout and circuit

operating conditions need to be taken into account.

The maximum continuous output current for the

AAT3242 is a function of the package power dissi-

pation and the input-to-output voltage drop across

the LDO regulator. To determine the maximum

output current for a given output voltage, refer to

the following equation. This calculation accounts

for the total power dissipation of the LDO regulator,

including that caused by ground current.

The following discussions will assume the LDO

regulator is mounted on a printed circuit board uti-

lizing the minimum recommended footprint as stat-

ed in the layout considerations section of this doc-

ument. At any given ambient temperature (T_A), the

maximum package power dissipation can be deter-

mined by the following equation:

P_D(MAX)= [(V_IN- V_OUTA)I_OUTA+ (V_INx I_GND)] + [(V_IN- V_OUTB)I_OUTB+ (V_INx I_GND)]

This formula can be solved for I_OUTAto determine the maximum output current for LDOA:

_D(MAX)- (2×V_IN× I_GND) - (V_IN- V_OUTB) × I_OUTB

V_IN- V_OUTA

I_OUTA(MAX)

3242.2006.04.1.10

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