The MAX4914B/MAX4915A/B/MAX4917A/B family of switches feature internal current limiting to prevent damage to host devices due to faulty load conditions. These analog switches have a low 0.2Ω on-resistance and operate from a 2.3V to 5.5V input voltage range. They are available with guaranteed 100mA, 200mA, and 300mA current limits, making them ideal for SDIO and other load switching applications.
When the switch is on and a load is connected to the port, a guaranteed blanking time of 14ms ensures that the transient voltages settle down. If after this blanking time the load current is greater than the current limit, the MAX4914B/MAX4915B/MAX4917B latchoff versions enter a latchoff state where the switch is turned off and active-low FLAG is issued to the microprocessor. The switch can be turned on again by cycling the power or the ON pin.
The MAX4915A/MAX4917AEUK have an autoretry feature where the switch turns off after the blanking time and then continuously checks to see if the overload condition is present. The switch turns on and remains on after the overload condition disappears and active-low FLAG deasserts.
The MAX4914B is available in the tiny 6-pin μDFN (2mm x 2mm) package, while the MAX4915A/B and MAX4917A/B are available in both 6-pin μDFN (2mm x 2mm) and space-saving 5-pin SOT23 packages. These devices operate over the -40°C to +85°C extended temperature range.
Feature
- Guaranteed Current Limit: 100mA, 200mA, 300mA
- Thermal-Shutdown Protection
- Reverse Current Protection
- 0.2Ω On-Resistance
- 14ms Guaranteed Blanking Time
- Active-Low FLAG Function
- 80μA Supply Current
- 8μA Latchoff Current (MAX4914B/MAX4915B/MAX4917B)
- Autoretry (MAX4915A/MAX4917A)
- 0.01μA Shutdown Current
- 2.3V to 5.5V Supply Range
- Undervoltage Lockout
- Fast Current-Limit Response Time (5μs)
- Low (0.1μA typ) Reverse Shutdown Current
- Tiny 6-Pin μDFN (2mm x 2mm) and 5-Pin SOT23 Packages
Applications
- Cell Phones
- GPS Systems
- Handheld Devices
- Notebook Computers
- PDAs and Palmtop Devices
- SDIO
- USB Ports
