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The ISL78205 is a synchronous buck controller with a 90mΩ high side MOSFET and low side driver integrated. The ISL78205 supports a wide input voltage range from 3V to 40V. Regarding the output current capability under thermal considerations, the ISL78205 can typically support a continuous load of 2. 5A under such 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 (or certain maximum temperature acceptable for the customer) 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.


  • 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)


  • Automotive applications
  • General purpose power regulator
  • 24V bus power
  • Battery power
  • Embedded processor and I/O supplies

Product Options

Orderable Part ID Part Status Pkg. Type Carrier Type MOQ Buy Sample
Obsolete TSSOP-EP Tube 740
Obsolete TSSOP-EP Reel 2500

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL78205 Datasheet Datasheet PDF 1.08 MB
User Guides & Manuals
ISL78205EVAL2Z User Guide Manual PDF 444 KB
ISL78205EVAL1Z User Guide Manual PDF 505 KB
Application Notes & White Papers
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCN14006 - Test Site Change for the Listed Intersil Products Product Change Notice PDF 168 KB