MAX4773

The MAX4772/MAX4773 switches feature selectable internal current limiting to prevent damage to host devices due to faulty load conditions. The MAX4772/MAX4773 include a logic input to select a guaranteed 200mA or 500mA current limit, making them ideal for SDIO and other load-switching applications. These analog switches have a low 0.2Ω on-resistance and operate from a 2.0V to 4.5V input voltage range.

When the switch is on and a load is connected to the port, a guaranteed blanking time of 14ms ensures that the transient voltage settles down. If, after this blanking time, the load current is greater than the current limit, the MAX4772 switch is turned off and issues an active-low FLAG to the microprocessor. The switch can be turned on again by cycling the power or the ON input.

The MAX4773 has an autoretry feature where the switch turns off and issues an active-low FLAG to the microprocessor after the blanking time and then continuously checks to see if the overload condition is present. The switch remains on after the overload condition disappears and active-low FLAG deasserts.

The MAX4772/MAX4773 are available in tiny space-saving 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) packages.

Applications

• Cell Phones
• Global Positioning Systems (GPS)
• Handheld Devices
• PDAs and Palmtop Devices
• SDIO