ISL78205
2.5A Buck Controller with Integrated High-Side MOSFET

Key Features

• Ultra Wide Input Voltage Range 3V to 40V (Refer to “Input Voltage” on page 12 for more details)
• Less than 3µA Shut Down Input Current (IC Disabled)
• Temperature Range -40°C to +105°C
• Integrated 90mΩ High-Side MOSFET
• Operational Topologies
• Synchronous Buck
• Non-Synchronous Buck
• Programmable Frequency from 200kHz to 2.2MHz and Frequency Synchronization Capability
• ±1% Tight Voltage Regulation Accuracy
• Reliable Cycle-by-Cycle Overcurrent Protection
• Temperature Compensated Current Sense
• Frequency Foldback
• Programmable OC Limit
• Hiccup Mode Protection in Worst Case Short Condition
• 20 Ld HTSSOP Package
• AEC - Q100 Qualified
• Pb-Free (RoHS Compliant)

Description

The ISL78205 is a synchronous buck controller with a 90mΩhigh side MOSFET and low side driver integrated. The ISL78205 supports a wide input voltage range from 3V to 40V. Regarding the output current capability, the ISL78205 can typically support a continuous load of 2.5A under conditions of 5V VOUT, VIN range of 8V to 30V, 500kHz, +85°C ambient temperature with still air. For any specific application, the actual maximum output current depends upon the die temperature not exceeding +125°C with the power dissipated in the IC, which is related to input voltage, output voltage, duty cycle, switching frequency, ambient temperature and board layout, etc. Refer to “Output Current” on page 12 for more details.

The ISL78205 offers the most robust current protections. It uses peak current mode control with cycle-by-cycle current limiting. It is implemented with frequency foldback under current limit conditions. In addition, the hiccup overcurrent mode is also implemented to guarantee reliable operations under harsh short conditions.

The ISL78205 has comprehensive protections against various faults, including overvoltage and over-temperature protections, etc.

Applications

• Automotive Applications
• General Purpose Power Regulator
• 24V Bus Power
• Battery Power
• Embedded Processor and I/O Supplies