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Date: 27-05-15

60V sync buck controller suggested as better option than DC/DC module for PoL

Intersil launched ISL8117 synchronous step-down PWM controller with low duty cycle of 40ns minimum on time supporting direct step-down conversion from 48V to a 1V PoL. ISL8117 targets multiple applications such as industrial, factory automation, medical and communications infrastructure applications.

ISL8117 designed to take lesser space, cost effective and reliable than DC/DC modules in high voltage applications where a lower output voltage is required. The ISL8117 uses valley current mode modulation with adaptive slope compensation to enable stable operation for a wide range of Vin and Vout combinations, with no external compensation required. ISL8117 offers adjustable frequency up to 2MHz.

Intersil says with ISL8117, power supply engineers can design a complete DC/DC buck conversion solution with only 10 components, including MOSFETs and passives, and achieve up to 98% conversion efficiency with 1.5% output voltage accuracy. The ISL8117's low pin count and layout friendly pin architecture also minimizes the number of overlapping traces, further improving power supply performance, adds Intersil.

"The ISL8117 buck controller addresses a growing need for direct POL conversion from very high input voltage such as 48V to 1V output," said Mark Downing, senior vice president of Infrastructure and Industrial Power Products at Intersil. "The unique ability to support light load efficiency mode is critical in industrial applications and makes the ISL8117 a much better alternative than existing solutions based on older technology."

Key Features and Specifications as per Intersil:
Wide input voltage range of 4.5V to 60V covers all standard input rails including 5V, 12V, 24V, 36V, 42V and 48V
Wide voltage output range is configurable from 0.6V to 54V
Smallest min on time in the market, which enables a very low duty cycle power supply and eliminates the need for a two stage solution in many applications
Programmable 100kHz to 2MHz switching frequency can be synchronized to reduce radiated system noise and avoid beat frequency issues
Complete fault protection for long term reliability including over-voltage, under-voltage, over-current and over-temperature
High current FET drivers and DEM mode operation ensures efficiency at all load levels
Adjustable soft-start with pre-bias support enables the sequenced startup of multiple ISL8117 controllers

The ISL8117 is available now in 4mm x 4mm QFN and 6.4mm x 5mm HTSSOP packages. Pricing for the QFN package is $1.80 USD and the HTSSOP is $1.95 USD in 1k quantities.

Two evaluation boards priced at $80 USD allow designers to quickly evaluate device features and performance: ISL8117EVAL1Z low power (Vin 4.5V-60V and 3.3Vout/6A), and the ISL8117EVAL2Z high power (Vin 18V-60V and 12Vout/20A).

Two demonstration reference design boards priced at $60 USD allow designers to produce low power (factory automation or robotic) and high power (telecom or pachinko) applications.

For more information on the ISL8117 60V controller, evaluation boards and demo reference design boards, visit: www.intersil.com/products/isl8117.

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