The LT3697EMSE#PBF is a 35V, 2.5A step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. The accurate, programmable current limit can eliminate the need for a USB power switch and improve system reliability. The provided 180mA active load reduces output overshoot during load transients. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 6.1V output, protecting USB devices during fault conditions. A separate 5V output can be taken from the SYS terminal to power auxiliary circuitry such as a USB hub controller. The LT3697EMSE#PBF also provides a load current monitor output and an overcurrent fault indicator.
The LT3697EMSE#PBF operates from 300kHz to 2.2MHz and withstands input voltage transients up to 60V. The device's output survives shorts to ground and to the battery. A current mode topology is used for fast transient response and good loop stability. Shutdown reduces input supply current to less than 1μA. The LT3697EMSE#PBF is available in a 16-lead MSOP package with an exposed pad for low thermal resistance.
Feature
- Accurate 5V Output
- Programmable Cable Drop Compensation
- Programmable Output Current Limit
- Adjustable Output from 5.0V to 6.1V
- Dual Input Feedback Permits Regulation on Output of USB Switch
- Active Load Reduces Output Overshoot
- FLT Flag Indicates Overcurrent on the USB Output
- 1.5ms FLT Flag Delay Filters Hot Plug Events
- USB Output Current Monitor
- Wide Input Rage: Operation from 5V to 35V
- Withstands Input Transient to 60V
- 2.5A Maximum Output Current
- Survives Output Short to GND and Car Battery
- Adjustable Switching Frequency: 300kHz to 2.2MHz
- Synchronizable from 300kHz to 2.2MHz
- Small, Thermally Enhanced 16-Lead MSOP Package
Applications
- Automotive USB
- Industrial USB
