AAT4292IJQ-T1

Overview

The AAT4292IJQ-T1 is a seven-channel high-side I/O expander from Skyworks Solutions, Inc., featuring P-channel MOSFETs controlled via the AS2Cwire serial interface. It operates within an input voltage range of 1.8V to 5.5V and delivers a typical quiescent current of 6.3µA, reducing to less than 1µA in shutdown mode. The device provides seven independent output channels with an on-state resistance (RDS(ON)) typically ranging from 1.1Ω to 3.8Ω depending on voltage and temperature. Packaged in a 10-pin SC70JW-10 footprint, it supports clock speeds up to 1MHz for state updates.

Feature Summary

• Seven independent high-side P-channel MOSFET switches configured for microprocessor GPIO expansion
• Serial control via AS2Cwire interface using a single EN/SET pin to decode 128 distinct states
• Low power consumption with operational current of 6.3µA and shutdown current below 1µA
• Integrated slew rate control to manage inrush currents during switching transitions

Applications

• Cell phone keypad and backlighting control
• General-purpose I/O expansion for portable devices
• Media player peripheral management
• Multiple channel low-power switching applications

Procurement Notes

Verify component authenticity by checking the marking code '4WXYY' against the datasheet specifications. Confirm the package type matches the SC70JW-10 outline dimensions. Ensure the ordering suffix '-T1' corresponds to the tape and reel packaging format required for automated assembly processes.

Selection Notes

Select this component when space-constrained designs require multiple high-side switches controlled by a single digital line. Verify that the load current per channel does not exceed the absolute maximum rating of 250mA. Consider thermal dissipation limits if operating at higher ambient temperatures or utilizing multiple channels simultaneously under heavy loads.

Part Context

This part belongs to the AAT4292 SmartSwitch family within Skyworks' Application Specific Power MOSFET (ASPM) product line. It is designed specifically for battery-powered portable electronics where minimizing active and standby power consumption is critical. The device integrates logic control and level shifting to facilitate direct interfacing with standard microprocessor GPIOs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How is the ON/OFF state of the outputs determined?

The states are controlled by counting rising edges on the EN/SET pin. Edges 1-32 represent data, while edges 33-36 select the address bank. The counter latches the value after the EN/SET pin remains high for the tLAT timeout period.

What happens if the input voltage drops below 1.8V?

If VIN drops below 1.8V, the internal UVLO circuit automatically shuts down the MOSFETs to prevent them from entering the linear region of operation, protecting the device from potential damage.

How is the shutdown mode activated?

Shutdown mode is activated by transitioning the EN/SET pin to a logic low state and maintaining it for the tOFF timeout duration. In this state, the supply current reduces to typically less than 1µA.