Buck controller allows 48V to 1V direct step-down

Intersil’s ISL8117 is the first 60V sync buck controller able to bypass the intermediate step-down conversion stage traditionally employed in industrial applications. The controller’s low duty cycle enables the direct step-down conversion from 48V to a 1V POL, making it possible for you to reduce system complexity and solution cost in a variety of applications.
The easy-to-use ISL8117 offers a cost-effective and reliable alternative for applications where Vout to Vin ratio is low.

Key Features

  • Wide input voltage range: 4.5V to 60V
  • Wide output voltage range: 0.6V to 54V
  • Light-load efficiency enhancement
    • Low ripple diode emulation mode with pulse skipping
  • Programmable soft-start
  • Supports pre biased output with SR soft-start
  • Programmable frequency: 100kHz to 2MHz
  • External sync
  • PGOOD indicator
  • Forced PWM
  • Adaptive shoot-through protection
  • No external current sense resistor
    • Use lower MOSFET rDS(ON)
  • Functional pins with default design values (ISL8117A)
  • Complete protection
    • Overcurrent, overvoltage, over-temperature, under voltage
  • Pb-free (RoHS compliant)


The ISL8117 and ISL8117A are synchronous buck controllers that generate POL voltage rails and bias voltage rails for a wide variety of applications in industrial and general purpose segments. Their wide input and output voltage ranges make them suitable for telecommunication and after-market automotive applications.
The ISL8117A is a derivative from the ISL8117 by replacing its CLKOUT pin with COMP pin to provide flexibility to customers to configure the voltage loop compensation externally.
Both the ISL8117 and ISL8117A use the valley current modulation technique to bring hassle-free power supply design with minimal number of components and complete protection from unwanted events.
They offer programmable soft-start and enable functions along with a power-good indicator for ease of supply rail sequencing and other housekeeping requirements. In ideal situations, a complete power supply circuit can be designed with 10 external components and provide OV/OC/OT protections in a space conscious 16 Led 4mmx4mm QFN (ISL8117, ISL8117A) or easy to assemble 6.4mmx5mm 16 Ld HTSSOP (ISL8117) package. Both packages use an EPAD to improve thermal dissipation and noise immunity. Low pin count, less number of external components and default internal values, make the ISL8117 and ISL8117A ideal solutions for quick to market simple power supply designs. The ISL8117 utilizes internal loop compensation and single resistor settings while the ISL8117A only utilizes the single resistor settings for other functions such as operating frequency and overcurrent protection. Their current mode control with VIN feed-forward enable them to cover various applications even with fixed internal compensations. The unique DEM/Skipping mode at light-load dramatically lowers standby power consumption with consistent output ripple over different load levels.


    • PLC and factory automation
    • Amusement machines
    • Industrial equipment’s
    • Security surveillance
    • Server and data centers
    • Switcher and routers
    • Telecom and data com
    • LED panels

Read More: Buck controller allows 48V to 1V direct step-down

Leave a Comment

Your email address will not be published. Required fields are marked *