Datasheet > AAT3221IJS-35-T1

AAT3221IJS-35-T1

更新时间： 2022-11-25 14:50:09

品牌	Logo	应用领域
ANALOGICTECH		稳压器
页数	文件大小	规格书
16页	392K
描述
150mA NanoPower⑩ LDO Linear Regulator

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AAT3221/2

150mA NanoPower™ LDO Linear Regulator

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

power dissipation is 267mW. At T_A= 25°C°, the

maximum package power dissipation is 667mW.

AAT3221/2, thus at 25°C, the device would not have

any thermal concerns or operational V_IN(MAX)limits.

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

ing is an example for an AAT3221/2 set for a 2.5

volt output at 85°C:

The maximum continuous output current for the

AAT3221/2 is a function of the package power dis-

sipation and the input to output voltage drop across

the LDO regulator. Refer to the following simple

equation:

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

mined to equal 267mW at T_A= 85°C.

V_OUT= 2.5 volts

I_OUT= 150mA

I_GND= 1.1µA

I_OUT(MAX)< P_D(MAX)/ (V_IN- V_OUT

)

For example, if V_IN= 5V, V_OUT= 2.5V and T_A= 25°,

I_OUT(MAX)< 267mA. The output short circuit protec-

tion threshold is set between 150mA and 300mA. If

the output load current were to exceed 267mA or if

the ambient temperature were to increase, the inter-

nal die temperature will increase. If the condition

remained constant and the short circuit protection

did not activate, there would be a potential damage

hazard to LDO regulator since the thermal protection

circuit will only activate after a short circuit event

occurs on the LDO regulator output.

V_IN(MAX)=(267mW+(2.5Vx150mA))/(150mA +1.1µA)

V_IN(MAX)= 4.28V

Higher input to output voltage differentials can be

obtained with the AAT3221/2, while maintaining

device functions in 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.

To figure what the maximum input voltage would be

for a given load current refer to the following equa-

tion. This calculation accounts for the total power

dissipation of the LDO Regulator, including that

caused by ground current.

For example, an application requires V_IN= 5.0V

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

V_INis greater than 4.28V, 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:

_D(MAX)= (V_IN- V_OUT)I_OUT+ (V_INx I_GND)

This formula can be solved for VIN to determine

the maximum input voltage.

P_D(MAX)is assumed to be 267mW

V_IN(MAX)= (P_D(MAX)+ (V_OUTx I_OUT)) / (I_OUT+ I_GND

)

I_GND= 1.1µA

I_OUT= 150mA

V_IN= 5.0 volts

V_OUT= 2.5 volts

The following is an example for an AAT3221/2 set

for a 2.5 volt output:

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

mined to equal 667mW at T_A= 25°C.

ꢀDC = 100(P_D(MAX)/ ((V_IN- V_OUT)I_OUT+ (V_INx I_GND))

ꢀDC=100(267mW/((5.0V-2.5V)150mA+(5.0Vx1.1µA))

ꢀDC = 71.2ꢀ

V_OUT= 2.5 volts

I_OUT= 150mA

I_GND= 1.1µA

For a 150mA output current and a 2.5 volt drop

across the AAT3221/2 at an ambient temperature

of 85°C, the maximum on time duty cycle for the

device would be 71.2ꢀ.

V_IN(MAX)=(667mW+(2.5Vx150mA))/(150mA +1.1µA)

V_IN(MAX)= 6.95V

Thus, the AAT3221/2 can sustain a constant 2.5V

output at a 150mA load current as long as V_INis ≤

6.95V at an ambient temperature of 25°C. 5.5V is

the maximum input operating voltage for the

The following family of curves shows the safe oper-

ating area for duty cycled operation from ambient

room temperature to the maximum operating level.

3221.2002.03.0.94

1...8 9 101112 13 14...16

中文翻译

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