Overview

The ISL8120 integrates two voltage-mode PWM leading-edge modulation control, with input feed-forward synchronous buck PWM controllers, to control a dual independent voltage regulator or a 2-phase single output regulator. It also integrates current sharing control for the power module to operate in parallel, which offers high system flexibility. The ISL8120 integrates an internal linear regulator, which generates VCC from input rail for applications with only one single supply rail. The internal oscillator is adjustable from 150kHz to 1. 5MHz, and is able to synchronize to an external clock signal for frequency synchronization and phase paralleling applications. Its PLL circuit can output a phase-shift programmable clock signal for the system to be expanded to 3-, 4-, 6-, 12- phases with desired interleaving phase shift. The ISL8120’s Fault Hand Shake feature protects any channel from overloading/stressing due to system faults or phase failure. The undervoltage fault protection features are also designed to prevent a negative transient on the output voltage during falling down. This eliminates the Schottky diode that is used in some systems for protecting the load device from reversed output voltage damage.

ISL8120 Functional Diagram
ISL8120 Functional Diagram
  • Wide VIN range operation: 3V to 22V
  • VCC operation from 3V to 5.60V
  • Excellent output voltage regulation: 0.6V ±0.6%/±0.9% internal reference over commercial/industrial temperature
  • Frequency synchronization
  • Programmable phase shift for 1-, 2-, 3-, 4-, 6-, up to 12-phase applications
  • Fault hand shake capability for high system reliability
  • Digital soft-start with precharged output start-up capability
  • Dual independent channel enable inputs with precision voltage monitor and voltage feed-forward capability
  • Programmable input voltage POR and its hysteresis with a resistor divider at EN input
  • Extensive circuit protection functions: output overvoltage, undervoltage, overcurrent protection, over temperature and pre-power-on reset overvoltage protection option

Applications

  • Power Supply for Datacom/Telecom and POL
  • Paralleling Power Module
  • Wide and Narrow Input Voltage Range Buck Regulators
  • DDR I and II Applications
  • High Current Density Power Supplies
  • Multiple Outputs VRM and VRD

Documentation

Design & Development

Software & Tools
iSim:PE Offline Simulation Tool
iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
Downloads
ISL8120 Dual iSim:PE ModelISL8120 Single iSim:PE Model
 Simulator Renesas
1 item
ISL8120EVAL3Z Evaluation Board

ISL8120EVAL3Z

Evaluation
Learn More

Dual/n-Phase Buck PWM Controller with Integrated Drivers Evaluation Board

The ISL8120EVAL3Z evaluation board is used for a performance demo of dual independent outputs and DDR applications.

The ISL8120 integrates two voltage-mode...

Featured Documents:
ISL8120EVAL3Z User Guide
ISL8120EVAL4Z Dual/n-Phase PWM Controller Eval Board

ISL8120EVAL4Z

Evaluation
Learn More

Dual/n-Phase Buck PWM Controller with Integrated Drivers Evaluation Board

The ISL8120EVAL4Z evaluation board is used for a performance demo of 2/n-phase single-output applications.

The ISL8120 integrates two voltage-mode synchronous buck...

Featured Documents:
ISL8120EVAL4Z User Guide

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    ISL8120CRZ
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    ISL8120IRZ
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