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Dual slew rate controlled load switch from AnalogicTech reduces system footprint and cost

31st October 2007

Advanced Analogic Technologies Inc., Europe

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Datasheet

AnalogicTech has introduced the AAT4282A, a dual, slew rate controlled load switch that allows designers to reduce parts count and cost by integrating two low resistance slew rate controlled load switches in a single 2 x 2mm package. Part of AnalogicTech’s rapidly growing application specific Power MOSFET (ASPM) product family, the AAT4282A features two MOSFETs, each with a typical RDS(ON) of just 60mohms at 5V to support higher load switch current handling capacity with a lower forward voltage drop than single competition devices on the market.

Slew-rate controlled switches are widely used in portable systems to replace discrete circuitry used to maximise battery efficiency and prolong battery life by turning off loads when not in use. By offering lower resistance in a dual device than comparable single devices in the same size package, the AAT4282A allows designers to extend battery life by minimising the voltage drop between the battery and operating system, while reducing component count, minimising board real estate and driving down cost.

Designed for high side load switching applications, the AAT4282A supports both 3V and 5V systems by operating from a wide 1.5V to 6.5V input range. Quiescent current is a low 1µA. Input logic levels are both TTL and 2.5V to 5V CMOS compatible.

The AAT4282A is available in three versions with different turn-on and turn-off characteristics. The AAT4282A-1 is a slew-rate limited load switch. For high speed switching applications, the AAT4282A-2 offers turn-on capabilities of less than 500ns and turn–off capabilities of less than 3µs typical. AAT4282A-3 adds a minimised slew rate limited turn-on function and a shutdown output discharge circuit to rapidly turn off a load when the switch is disabled.

The AAT4282A also features a slew-rate selector pin that allows the designer to switch between fast and slow slew rates on the same device. This capability simplifies inventory management by allowing designers to use the same device to address two different applications.

Qualified across the -40 C to +85 C temperature range, the 4282A is available in a Pb-free, 8-pin FTDFN22-8 package.