AAT4282A 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT4282A

Slew Rate Controlled Load Switch

Advanced Analogic Technologies 

SmartSwitchTM

Finally, the total power dissipation for channels A and B

is determined as follows:

PD(total) = PD(CHA) + PD(100mA) + PD(3A)

PD(total) = 174.7mW + 1.53mW + 196.7mW

PD(total) = 373mW

The maximum power dissipation for the AAT4282A oper-

ating at an ambient temperature of 85°C is 373mW. The

device in this example will have a total power dissipation

of 571mW. This is well within the thermal limits for safe

operation of the device; in fact, at 85°C, the AAT4282A

will handle a 3A pulse for up to 25% duty cycle. At lower

ambient temperatures, the duty cycle can be further

increased.

PRODUCT DATASHEET

AAT4282A

Slew Rate Controlled Load Switch

Printed Circuit Board

Layout Recommendations

For proper thermal management, and to take advantage

of the low RDS(ON) of the AAT4282A, a few circuit board

layout rules should be followed: VIN and VOUT should be

routed using wider than normal traces, and GND should

be connected to a ground plane. For best performance,

CIN and COUT should be placed close to the package pins.

Evaluation Board Layout

The AAT4282A evaluation layout follows the printed cir-

cuit board layout recommendations and can be used for

good applications layout. Refer to Figures 1 through 2.

Note: Board layout shown is not to scale.

Figure 1: Evaluation Board Top Side Layout.

Figure 2: Evaluation Board Bottom Side Layout.

4282A.2008.02.1.2

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