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 synchronous 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.

特性 Features

? 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 Pre-Charged 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