The MAX4772/MAX4773EUT switches feature selectable internal current limiting to prevent damage to host devices due to faulty load conditions. The MAX4772/MAX4773EUT 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 MAX4773EUT 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/MAX4773EUT are available in tiny space-saving 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) packages.
Feature
- Guaranteed Current Limit: 200mA or 500mA
- Thermal-Shutdown Protection
- Reverse-Current Protection
- 0.2Ω On-Resistance (SEL = High)
- 14ms Guaranteed Blanking Time
- Active-Low FLAG Function
- Autoretry (MAX4773)
- 80μA Supply Current
- 6μA Latch-Off Current (MAX4772)
- 0.01μA Shutdown Current
- 2.0V to 4.5V Supply Range
- Fast Current-Limit Response Time
- Tiny SOT23 and TDFN Packages
- UL Certification Pending
Applications
- Cell Phones
- Global Positioning Systems (GPS)
- Handheld Devices
- PDAs and Palmtop Devices
- SDIO
