ISL8120IRZ Switching Controllers SCALABLE 2-PHS CNTRL W/INTEGRTD DRVRS C

The ISL8120 integrates two voltage-mode PWM leading-edgemodulation control, with input feed-forward

synchronous buckPWM controllers, to control a dual independent voltageregulator or a 2-phase single

output regulator. It alsointegrates current sharing control for the power module tooperate in parallel, which

offers high system flexibility.The ISL8120 integrates an internal linear regulator, whichgenerates VCC from

input rail for applications with only onesingle supply rail. The internal oscillator is adjustable from150kHz

to 1.5MHz, and is able to synchronize to an externalclock signal for frequency synchronization and phase

parallelingapplications. Its PLL circuit can output a phase-shiftprogrammable 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 channelfrom overloading/stressing due to system faults or phasefailure. The

undervoltage fault protection features are alsodesigned to prevent a negative transient on the output

voltageduring falling down. This eliminates the Schottky diode that isused in some systems for protecting

the load device fromreversed output voltage damage.

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 to12-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 precisionvoltage monitor and voltage feed-forward capability-

  Programmable input voltage POR and its hysteresis with aresistor divider at EN input

• Extensive circuit protection functions: output overvoltage,undervoltage, overcurrent protection, over

  temperature andpre-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