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AAT3218IGV-2.6-T1

更新时间： 2024-02-19 17:46:14

品牌	Logo	应用领域
ANALOGICTECH		稳压器电源电路
页数	文件大小	规格书
18页	368K
描述
150mA MicroPower⑩ High Performance LDO

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AAT3218IGV-2.6-T1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.84	Is Samacsys：	N
湿度敏感等级：	3	Base Number Matches：	1

AAT3218IGV-2.6-T1 数据手册

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AAT3218

150mA MicroPower™ High Performance LDO

This formula can be solved for V_INto determine the

maximum input voltage.

From the discussion above, P_D(MAX)was deter-

mined to equal 211mW at T_A= 85°C.

Higher input-to-output voltage differentials can be

obtained with the AAT3218, while maintaining

device functions within the thermal safe operating

area. To accomplish this, the device thermal

resistance must be reduced by increasing the heat

sink area or by operating the LDO regulator in a

duty-cycled mode.

P_D(MAX)+ (V_OUT· I_OUT)

V_IN(MAX)

I_OUT· I_GND

The following is an example for an AAT3218 set for

a 2.5V output:

For example, an application requires V_IN= 4.2V

while V_OUT= 2.5V at a 150mA load and T_A= 85°C.

V_INis greater than 3.90V, which is the maximum

safe continuous input level for V_OUT= 2.5V at

150mA for T_A= 85°C. To maintain this high input

voltage and output current level, the LDO regulator

must be operated in a duty-cycled mode. Refer to

the following calculation for duty-cycle operation

(P_D(MAX)is assumed to be 211mW):

V_OUT

I_OUT

I_GND

= 2.5V

= 150mA

= 150µA

526mW + (2.5V × 150mA)

150mA + 150µA

V_IN(MAX)

V_IN(MAX)= 6.00V

From the discussion above, P_D(MAX)was deter-

mined to equal 526mW at T_A= 25°C.

I_GND= 150μA

I_OUT= 150mA

V_IN= 4.2V

V_OUT= 2.5V

Thus, the AAT3218 can sustain a constant 2.5V

output at a 150mA load current as long as V_INis

≤ 6.0V at an ambient temperature of 25°C. 6.0V is

the absolute maximum voltage where an AAT3218

would never be operated, thus at 25°C, the device

would not have any thermal concerns or opera-

tional V_IN(MAX)limits.

P_D(MAX)

%DC = 100

(V_IN- V_OUT)I_OUT+ (V_IN× I_GND

)

211mW

(4.2V - 2.5V)150mA + (4.2V × 150µA)

This situation can be different at 85°C. The follow-

ing is an example for an AAT3218 set for a 2.5V

output at 85°C:

%DC = 100

%DC = 85.54%

For a 150mA output current and a 2.7V drop across

the AAT3218 at an ambient temperature of 85°C,

the maximum on-time duty cycle for the device

would be 85.54%.

V_OUT

I_OUT

I_GND

= 2.5V

= 150mA

= 150µA

The following family of curves show the safe oper-

ating area for duty-cycled operation from ambient

room temperature to the maximum operating level.

211mW + (2.5V × 150mA)

150mA + 150µA

V_IN(MAX)

V_IN(MAX)= 3.90V

3218.2006.04.1.8

1...9 10 111213 14 15...18

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