AnalogicTech’s AAT4600 series is a family of adjustable and fixed-voltage SmartSwitch products with a range of current handling capabilities. Single versions with adjustable current limit (AAT4610, AAT4601) or fixed current limit (AAT4625) are available, as well as dual versions with fixed current limit (AAT4626, AAT4670).
The AAT4618 SmartSwitch is a member of the Application Specific Power MOSFET (ASPM) product family. It is a current limited
P-channel MOSFET power switch designed for high-side load switching applications operating with inputs ranging from 2,4 V to 5,5 V, making it suitable for 2,5 V, 3 V and 5 V systems.
An integrated current limiting circuit protects the input supply from large currents which may cause the supply to fall out of regulation. In addition, thermal overload protection limits power dissipation and junction temperatures associated with prolonged periods of operation in current limit mode.
Due to its low RDS(ON) (125 mΩ typical) the AAT4618 can be used to control loads that require up to factory preset 400 mA, 500 mA or 1 A. The current limit response to a sudden short circuit is a mere 400 ns, which reduces the requirements of local supply bypassing. An open-drain FAULT flag signals an
over-current or over-temperature condition after a 4 ms timeout. Quiescent current is a low 10 A and the supply current decreases to less than 1 A in shutdown mode. The AAT4618 is available in a lead-free, 5-pin SOT-23 or an 8-pin SC70JW package and is specified over the -40°C to +85°C temperature range.
The AAT4614 device is an adjustable current limit version and the current limit threshold is programmed with a resistor from the SET pin to ground and may be adjusted for levels up to 1,4 A. The AAT4614 is offered in the small lead-free, 8-pin SC70JW, SOT23-6 and SOT23-5 packages and is also specified for operation over the -40°C to +85°C ambient temperature range.
Typical applications where these devices are used are hot swap supplies, peripheral ports, personal communication devices and USB ports.
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