Datasheet > AAT4282A

AAT4282A

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		开关
页数	文件大小	规格书
14页	547K
描述
Dual Slew Rate Controlled Load Switch

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AAT4282A 数据手册

AAT4282A

Dual Slew Rate Controlled Load Switch

the internal parasitic diode and allow excessive

current flow into the VOUT pin, possibly damaging

the load switch. In applications where there is a

possibility of V_OUTexceeding V_INfor brief periods of

time during normal operation, the use of a larger

value C_INcapacitor is highly recommended. A larg-

er value of C_INwith respect to C_OUTwill effect a

slower C_INdecay rate during shutdown, thus pre-

venting V_OUTfrom exceeding V_IN. In applications

where there is a greater danger of V_OUTexceeding

V_INfor extended periods of time, it is recommend-

ed to place a Schottky diode from V_INto V_OUT(con-

necting the cathode to V_INand anode to V_OUT). The

Schottky diode forward voltage should be less than

0.45V.

Constants for the AAT4282A are maximum junction

temperature (T_J(MAX)= 125°C) and package ther-

mal resistance (θ_JA= 70°C/W). Worst case condi-

tions are calculated at the maximum operating tem-

perature, T_A= 85°C. Typical conditions are calcu-

lated under normal ambient conditions where T_A=

25°C. At T_A= 85°C, P_D(MAX)= 571mW. At T_A=

25°C, P_D(MAX)= 1429mW.

The maximum continuous output current for the

AAT4282A is a function of the package power dis-

sipation and the R_DSof the MOSFET at T_J(MAX). The

maximum RDS of the MOSFET at T_J(MAX)is calcu-

lated by increasing the maximum room tempera-

ture R_DSby the R_DStemperature coefficient. The

temperature coefficient (TC) is 2800ppm/°C.

Therefore, at 125°C:

Thermal Considerations and High

Output Current Applications

R_DS(MAX)= R_DS(25°C)· (1 + TC · ΔT)Ω

R_DS(MAX)= 130mΩ · + 0.002800 · (125°C - 25°C))

R_DS(MAX)= 166.4mΩ

The AAT4282A is designed to deliver a continuous

output load current. The limiting characteristic for

maximum safe operating output load current is

package power dissipation. In order to obtain high

operating currents, careful device layout and circuit

operating conditions must be taken into account.

For maximum current, refer to the following equation:

P_D(MAX)

I_OUT(MAX)

R_DS

The following discussions will assume the load

switch is mounted on a printed circuit board utilizing

the minimum recommended footprint as stated in

the Printed Circuit Board Layout Recommendations

section of this datasheet.

For example, if V_IN= 5V, R_DS(MAX)= 166.4mΩ, and

T_A= 25°C, I_OUT(MAX)= 2.93A. If the output load cur-

rent were to exceed 2.93A or if the ambient tem-

perature were to increase, the internal die temper-

ature would increase and the device would be

damaged. Higher peak currents can be obtained

with the AAT4282A. To accomplish this, the device

thermal resistance must be reduced by increasing

the heat sink area or by operating the load switch

in a duty cycle manner. Duty cycles with peaks less

than 2ms in duration can be considered using the

method described in the High Peak Current

Applications section of this datasheet.

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

mum package power dissipation can be deter-

mined by the following equation:

T_J(MAX)- T_A

P_D(MAX)

θ_JA

1 The actual maximum junction temperature of AAT4282A is 150°C. However, good designed practice is to derate the maximum die tem-

perature down to 125 °C to prevent the possibility of over-temperature damage.

4282A.2007.09.1.1

1...7 8 91011 12 13 14

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