Datasheet > AAT3220IGY-2.5-T1

AAT3220IGY-2.5-T1

更新时间： 2024-01-04 08:55:34

品牌	Logo	应用领域
AAT		稳压器
页数	文件大小	规格书
16页	186K
描述
150mA NanoPower™ LDO Linear Regulator

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AAT3220IGY-2.5-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	湿度敏感等级：	3
Base Number Matches：	1

AAT3220IGY-2.5-T1 数据手册

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AAT3220

150mA NanoPower™ LDO Linear Regulator

At any given ambient temperature (T_A), the maxi-

mum package power dissipation can be deter-

mined by the following equation:

P_D(MAX)= (V_IN- V_OUT)I_OUT+ (V_IN× I_GND

)

This formula can be solved for V_INto determine the

maximum input voltage.

T_J(MAX)- T_A

θ_JA

P_D(MAX)

P_D(MAX)+ (V_OUT× I_OUT

)

V_IN(MAX)

Constants for the AAT3220 are T_J(MAX), the maxi-

mum junction temperature for the device which is

125°C and Θ_JA= 200°C/W, the package thermal

resistance. Typically, maximum conditions are cal-

culated at the maximum operating temperature

where T_A= 85°C; under normal ambient conditions

T_A= 25°C. Given T_A= 85°C, the maximum pack-

age power dissipation is 200mW. At T_A= 25°C, the

maximum package power dissipation is 500mW.

I_OUT+ I_GND

The following is an example for an AAT3220 set for

a 3.0V output:

V_OUT

I_OUT

I_GND

= 3.0V

= 150mA

The maximum continuous output current for the

AAT3220 is a function of the package power dissi-

pation and the input-to-output voltage drop across

the LDO regulator. Refer to the following simple

equation:

= 1.1µA

500mW + (3.0V × 150mA)

150mA + 1.1µA

V_IN(MAX)

V_IN(MAX)= > 5.5V

P_D(MAX)

V_IN- V_OUT

I_OUT(MAX)

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

mined to equal 417mW at T_A= 25°C.

Thus, the AAT3220 can sustain a constant 3.0V

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

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

the maximum input operating voltage for the

AAT3220, thus at 25°C, the device would not have

any thermal concerns or operational V_IN(MAX)limits.

For example, if V_IN= 5V, V_OUT= 3V and T_A= 25°C,

I_OUT(MAX)< 250mA. The output short-circuit protec-

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

the output load current were to exceed 250mA or if

the ambient temperature were to increase, the inter-

nal die temperature would increase. If the condition

remained constant and the short-circuit protection

did not activate, there would be a potential damage

hazard to the LDO regulator since the thermal pro-

tection circuit will only activate after a short-circuit

event occurs on the LDO regulator output.

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

ing is an example for an AAT3220 set for a 3.0V

output at 85°C:

V_OUT

I_OUT

I_GND

= 3.0V

To determine the maximum input voltage for a

given load current, refer to the following equation.

This calculation accounts for the total power dissi-

pation of the LDO regulator, including that caused

by ground current.

= 150mA

= 1.1µA

200mW + (3.0V × 150mA)

150mA + 1.1µA

V_IN(MAX)

V_IN(MAX)= 4.33V

3220.2006.01.1.4

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

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