DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control General Description Features TM The AAT4290 and AAT4291 SmartSwitch products are 1.8V to 5.5V Input Voltage Range members of Skyworks Application Specific Power MOSFET 5 or 3 Independent Load Switches 2 (ASPM) product family. The AAT4290 and AAT4291 are S Cwire Interface five and three P-channel MOSFETs, respectively, config- 1.1 R Per Switch DS(ON) ured for use as a microprocessor I/O expander. Having Low Quiescent Current independent drain outputs and a common source input, - 4.5A Typical they operate with an input voltage ranging from 1.8V to - 0.1A in Shutdown 5.5V, making them ideal for 2.5V, 3.3V, or 5V systems, as -40C to +85C Temperature Range well as systems powered by lithium-ion/polymer batter- 8-Pin SC70JW Package ies. Each switch features a 500ns turn-on time. The switch states are controlled by Skyworks Simple Serial Applications 2 Control (S Cwire) interface which permits ease of con- trol and efficiency of size. The quiescent supply current is Cell Phones very low, typically 4.5A. In shutdown mode, the supply I/O Expansion current is reduced to less than 1A. Multiple Low Power Switching Personal Communication Devices The AAT4290 and AAT4291 are offered in a Pb-free, Portable Electronic Devices 8-pin SC70JW package specified over the -40C to +85C temperature range. A typical application circuit is shown in Figure 1. The pin configurations are shown in Figure 2. A functional block diagram of the AAT4290/4291 is provided in Figure 3. Typical Application INPUT IN OUT1 OUT1 OUT2 OUT2 AAT4290 OUT3 OUT3 EN/SET EN/SET OUT4 OUT4 OUT5 OUT5 GND C C C C C C IN OUT1 OUT2 OUT3 OUT4 OUT5 1F 0.1F 0.1F 0.1F 0.1F 0.1F GND GND Figure 1. Typical Application Circuit. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 202221B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Pin Descriptions Pin AAT4290 AAT4291 Symbol Function Input power supply is connected to the P-channel MOSFET sources. Connect a 1F capaci- 11 IN tor from IN to GND. 2 7 OUT2 P-channel MOSFET drain. 3 6 OUT1 P-channel MOSFET drain. 2 Input control pin using S Cwire serial interface. The device records rising edges of the 4 4 EN/SET clock and decodes them into 32 states (8 states for AAT4291) which controls the ON/OFF states of the MOSFETs. See Table 1 and Table 2 for output settings. 5 5 GND Ground connection. 6 N/A OUT5 P-channel MOSFET drain. 7 N/A OUT4 P-channel MOSFET drain. 8 8 OUT3 P-channel MOSFET drain. N/A 2, 3 N/C Not connected. Pin Configuration AAT4290 AAT4291 8 8 1 1 IN OUT3 IN OUT3 2 7 2 7 OUT2 OUT4 N/C OUT2 3 6 3 6 OUT1 OUT5 N/C OUT1 45 45 EN/SET GND EN/SET GND Figure 2. AAT4290/4291 Pinout 8-pin SC70JW (Top View). Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 202221B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. February 17, 2013